.

Bautista González, Castellanos González & Montañez / INGE CUC, vol. 19 no. 2, pp. 6784July - December, 2023

Diversity of the arvense flora present in plots of small farmers, planned for polyculture in five municipalities of Boyacá

Diversidad de la flora arvense presente en parcelas de pequeños agricultores, previstas para policultivos en cinco municipios de Boyacá

DOI: http://doi.org/10.17981/ingecuc.19.2.2023.06

Scientific Research Article. Date of Receipt: 16/03/2022. Date of Acceptance: 11/08/2022.

Harold Bautista González

Universidad de Pamplona. Norte de Santander (Colombia)

haroldbautista0622@gmail.com

Leonides Castellanos González

Universidad de Pamplona. Norte de Santander (Colombia)

lclcastell@gmail.com

Gladys Montañez

Universidad de Pamplona. Norte de Santander (Colombia)

gmontaneza@gmail.com

.

To cite this paper:

H. Bautista González, L. Castellanos González & G. Montañez, “Diversity of the arvense flora present in plots of small farmers, planned for polyculture in five municipalities of Boyacá”, INGE CUC, vol. 18, no. 2, pp. 67–84, 2023. DOI: http://doi.org/10.17981/ingecuc.19.2.2023.06

.

Abstract

Introduction— The most critical impact of weeds is the negative effect on cultivated plants exerted through competition for limited resources and allelopathies. Studies have demonstrated the dominance of weeds in crops and have established ecological methods for good integrated management.

Objective— To characterize the diversity of weed species in 60 smallholder farms in five municipalities of Boyacá, planned for polycultures.

Methodology— The research was carried out in 60 farms in five municipalities of the Department: Aquitania, Belén, Garagoa, Panqueba and Soatá, in each one two plots of 0.5 ha were sampled where the weeds present were determined in two frames of 1m2.

Results— The presence of 109 species of weeds located in 93 genera and 38 botanical families was observed, being the most representative Poaceae with 18 species, Asteraceae with 15 species and Fabaceae with 9. The families Amarantaceae Apiaceae, Lamiaceae, Oxalidaceae, Poligonaceae and Solanaceae were represented by 4 species. The farms were grouped into 3 or 4 groups in each municipality according to the biodiversity indicators of the weeds, while the municipalities formed three groups.

Conclusions— From the point of view of their agricultural importance, the species most frequently present in the municipalities were: P. clandestinum, Sonchus oleraceus L, Trifolium repens and Rumex crispus. In general, species richness at the farm level was low, equity medium and dominance high, while at the municipal level were observed high species richness, medium indicators of diversity and equity and low dominance

Keywords— Competition; yield; productivity; agro­ecosystem; soil conservation; species richness

Resumen

Introducción— El impacto más crítico de las arvenses es el efecto negativo sobre las plantas cultivadas ejercido a través de la competencia por recursos limitados y las alelopatías.

Objetivo-. Caracterizar la diversidad de especies de arvenses en 60 fincas de pequeños agricultores de cinco municipios de Boyacá previstos para policultivos.

Metodología— La investigación se desarrolló en 60 fincas de cinco municipios del Departamento: Aquitania, Belén, Garagoa, Panqueba y Soatá, en cada una se muestrearon dos parcelas de 0,5 ha donde se determinó en dos marcos de 1m2 las arvenses presentes.

Resultados— Se observó la presencia de 109 especies de arvenses ubicadas en 93 géneros y en 38 familias botánicas, siendo las más representativas Poaceae con 18 especies, Asteraceae con 15 especies y Fabaceae con 9. Las familias Amarantaceae Apiaceae, Lamiaceae, Oxalidaceae, Poligonaceae y Solanaceae estuvieron representadas por 4 especies. Las fincas se agruparon en 3 o 4 grupos en cada municipio de acuerdo a los indicadores de biodiversidad de las arvenses, mientras que los municipios formaron tres grupos.

Conclusiones— Desde el punto de vista de su importancia agrícola las especies que con más frecuencia estuvieron presentes en los municipios fueron: P. clandestinum, Sonchus oleraceus, Trifolium repens y Rumex crispus. En general la riqueza de especies a nivel de finca fue baja, la equidad media y la dominancia alta, mientras que a nivel municipal se apreció una alta riqueza de especies, indicadores medios de diversidad y equidad, y baja dominancia.

Palabras clave— Competencia; rendimiento; productividad; agroecosistema; conservación de suelo; riqueza de especies

I. Introduction

In agroecosystems, weeds contribute positively and negatively to ecological and conservation processes, whether soil, environmental or crop. In turn, they have great interaction in the competition for resources such as nutrients, water, space and light. Weeds are defined as those plants that cause more damage than benefits; those plant species that have the ability to compete for limiting resources such as soil, water and light with cultivated plants [1].

Weeds are a special form of vegetation that is highly successful in agricultural environments, since they are plant populations that grow in environments disturbed by humans without having been planted. From an ecological point of view, vines can be placed among the pioneers of secondary succession. In the agroecosystem, the most critical impact of weeds is the negative effect on cultivated plants exerted through competition for limited resources and allelopathies [2].

Over time, these plants have retained a bad reputation due to the characteristics and interspecific relationships generated with the organisms that inhabit the crops. Competition for resources has led these plants to adapt and resist adverse conditions. Considering the interspecific competition relations, weeds represent the greatest constraint to world agriculture, since their invasive work facilitates competition with economic crops and at the same time they are hosts of pests and diseases [3].

Weeds are considered “weeds” when they affect the interests and objectives of man, being qualified in agriculture as the main pests due to the negative economic impact they can cause in this activity. Unlike other pests, undesirable plants almost always arise in an association of species which remain in equilibrium until the ecosystem is affected by practices such as tillage, fertilization and pesticide application. For this reason, the systematic evaluation of the weed population becomes indispensable in crop areas as a guide for the control measures to be developed [4].

On the other hand, it is considered of great importance to carry out studies on the evaluation of the dominance of weeds present in crops. When identified, ecological methods can be established for a good integrated management of unwanted plants, which in turn regulate and maintain environmental potentials in balance. Weeds have adaptations that allow them to survive in crop environments, and because of this they are considered dynamic colonizing plants that have a high reproductive capacity and effective interactions with other organisms in the agroecosystem [5].

Research and studies on interactions between weeds as host plants, as ecological indicators, as a source of biomass and allelopathic agents in tropical cropping systems have multiplied. However, the need for weed management continues to be investigated in order to find the most effective way to eradicate species or populations of these plants in tropical agricultural ecosystems [6].

In order to be in tune with existing environmental and socioeconomic conditions, there are currently a large number of practices and technologies to improve the functioning of agroecosystems, the end result of which is to achieve greater ecological sustainability. By adopting ecological management practices, the farmer has the potential to increase the stability and resilience of the agroecosystem [7].

Nowadays, weeds have gained space in crop systems through conventional agriculture, since it is considered that the presence of different species within crops generates a great impact on the crop entomofauna, to such an extent that there is a greater effectiveness of predators and parasitoids. At the same time, beneficial insects have greater possibilities of finding alternative prey, shelter, breeding sites and refuges for dormancy [8].

Taking into account the above mentioned, the objective of the research was to characterize the arvense flora at taxonomic level and predominant richness in number of species in plots of smallholder farms in 5 municipalities of the department of Boyacá Characterize the diversity of arvense species in 60 smallholder farms in five municipalities of Boyacá planned for polycultures, within the framework of the project “Implementation of associative agricultural models with traditional crops for economic and environmental management in the department of Boyacá” ,in order to take it into account for future weed management plans.

II. Materials and Methods

Observational research was carried out in plots of 60 smallholder farms, 12 in each of the 5 selected municipalities in the Department of Boyacá, as shown in Fig. 1: Panqueba, Aquitania, Belén, Soatá and Garagoa; farmers who participated in a project that considered polycultures as a sustainable alternative.

Fig. 1. Map showing the location of the municipalities where the research was carried out.
Source: Authors.

In the areas under study, the history of land use was considered for the characterization of the arvense flora (Table 1).

Table 1.
History of the properties in the municipalities studied.

Farm

Land use of the lot

Time in use

Soata

Ronquilla

Native savanna

4 years

El Ralo

Native savanna

3 years

Gallinacera

Corn cultivation

2 years

La Palma

Fallow

3 years

El Almorzadero

Fallow

5 years

Los Laureles

Native savanna

4 years

El Cito

Native savanna

5 years

Florencia

Native savanna

3 years

La Primavera

Fallow

2 years

Gallinero

Native savanna

3 years

Copa de Oro

Corn cultivation

5 years

El Gaque

Corn cultivation y Native savanna

5 years

Panqueba

Los fiquetones

Native savanna

5 years

Laguna de Ruchical

Native savanna

3 years

Cuatro Esquinas

Onion cultivation

3 years

Oreganillal

Corn cultivation

4 years

Picachito

Fallow

5 years

El Uvo

Onion cultivation

4 years

La Rinconada

Bean cultivation

6 years

El Carmen

Native savanna

4 years

El Recuerdo

Fallow

5 years

El Reposo

Corn cultivation

6 years

Santo Domingo

Native savanna

3 years

El Tuno

Onion cultivation

6 years

Belén

Peña Colorada

Native savanna

5 years

Ojo de Agua

Native savanna

3 years

El Aguirre

Potato cultivation

3 years

El Chital

Potato cultivation

4 years

Hoya

Fallow

5 years

El Cardón

Native savanna

4 years

El Pino

Potato cultivation

3 years

Buenos Aires

Native savanna

4 years

Puerto Nuevo

Fallow

5 years

El Morito

Native savanna

5 years

La Meseta

Potato cultivation

4 years

La Primavera

Potato cultivation

5 years

Garagoa

El Pincel

Fallow

5 years

La Realidad

Fallow

3 years

El bosque

Sugar cane

5 years

Portin

Fallow

3 years

Los pinos

Native savanna

4 years

Betania

Pastures (Brachiaria)

3 years

El arrayan

Sugar cane

4 years

San Luis

Pastures (Brachiaria)

5 years

La Rivera

Fallow

5 years

La quinta

Native savanna

4 years

San José

Lulo cultivation

5 years

Granja Guaney

Sugar cane

3 years

Aquitania

Tomita 2

Potato cultivation

3 years

El Romero

Onion cultivation

5 years

Cañada Honda

Potato cultivation

4 years

Buenavista

Onion cultivation

4 years

El Espinal

Fallow

3 years

La Laja

Native savanna

5 years

El Colorado

Fallow

3 years

La Laja 1

Native savanna

4 years

Las pilas

Fallow

3 years

Las cañas

Native savanna

5 years

Encenecillo y Ladera

Native savanna

4 years

San Fernando

Fallow

3 years

Source: Authors.

The farms incorporated into the project had to have between 1 and 3 ha, of which two plots of 0.5 ha were used in the research, which would be used to compare polyculture and monoculture production models, as shown in Table 2.

Table 2.
Agroecological models to be established and their crops by municipality.

Municipality

Monocrop

Polycrop

Panqueba

Onion (Allium cepa L.)

Onion, Beans

Peach (Prunus persica L.)

Peach, Beans y Corn

Corn (Zea mays L.)

Corn, Beans y Pea

Soatá

Peach (Prunus persica L.)

Peach, Beans and Corn

Pea (Pisum sativum L.)

Pea, Corn

Corn (Zea mays L.)

Corn, Beans and Peas

Belén

Potato (Solanum tuberosum L.)

Potato, Peas

Creole potato (Solanum phureja Juz. & Bukasov)

Creole potato, Pea

Corn (Zea mays L.)

Corn, Beans

Aquitania

Onion stalk (Allium fistulosum L.)

Onion stalk, Pea, Potato

Onion stalk (Allium fistulosum L.)

Onion stalk, Peas

Onion stalk (Allium fistulosum L.)

Onion stalk, Potato

Garagoa

Coffee (Coffea Arábica), Banana (Musa paradisiaca).

Coffee, Banana, Beans

Coffee (Coffea Arábica), Banana (Musa paradisiaca).

Coffee, Banana y Peas

Coffee (Coffea Arábica), Banana (Musa paradisiaca).

Coffee, Banana, Corn

Source: Authors.

To determine the species of weeds, present on each farm and their abundance, samples were taken in the 12 farms previously selected from the information provided by the Governor’s Office of Boyacá on the farms of small farmers that were representative of their similar farms in the municipality, for which the formula proposed by FUSM [9] was used, where a margin of error of 10% and a confidence level of 95% were considered, resulting in a sample size of 60 farms.

Before sampling, a tour of each of the farms was carried out to determine the two 0.5 ha plots that were selected to participate in the research and to determine which was the plot where the agroecological polyculture was located and which was the monoculture or control crop.

Subsequently, the selection of the area with the highest possible representativeness of the adventitious and/or herbaceous vines of each plot was carried out. The groups included in the characterization were the class Liliopsida (monocotyledons), Magnoliopsida (dicotyledons) and Pteridophytas (ferns). For the determination of the arboreal species, a square PVC frame measuring 1 × 1 = 1 m2 was randomly thrown twice in each plot of 0.5 ha in order to obtain the greatest number of representative arboreal species per plot.

The identification of the weeds was carried out in situ, taxonomically classifying all the adult species present based on the characteristics of the roots, leaves, flowers, inflorescence and fruits, and also photographic records were taken for later identification by comparative botany, considering the taxonomy of each weed, for which specimens of the species were collected.

Each species collected was identified by common name and photographic record in a preliminary species inventory. Information on habit, life cycle, habitat and some vegetative characters from field observations and secondary information was also included. For the collection of the material, the collection protocols of the HFAB of the UNAL (Bogotá, Colombia) were followed. This information was complemented and verified with that of the virtual herbarium of the UNAL [10].

The species richness index [11] was determined and these data were tabulated in Microsoft Excel. A descriptive analysis was made of all the information related to abundance, species richness and cover by plot, farm and municipality. The number of individuals of each species in each quadrat was also determined, which allowed us to have the abundance or number of individuals per quadrat.

With this information, other variables were determined [11], such as:

Where:

S = total number of species present.

N = total number of individuals.

In addition, Shannon and Simpson index [12] as:

Where:

D = Simpson.

pi = Proportional abundance of the species.

Since this was a descriptive study and the variables were quantitative (biodiversity indices), univariate (summary tables and figures) and multivariate (Principal Component Analysis (PCA) and Cluster Analysis (CA) statistical techniques were used to classify the farms in each municipality according to the biodiversity indices: specific richness, Margalef diversity, equity and dominance. The significance level was 5% and the R package version 4.1 was used.

III. Results and Analysis

Characterization in taxonomic groups of the weeds. In the study carried out in the 60 farms in the five municipalities, 109 species of weeds were present in 93 genera and 38 botanical families. The most representative families were Poaceae with 18 species, Asteraceae with 15 species and Fabaceae with 9. The families Amarantaceae Apiaceae, Lamiaceae, Oxalidaceae, Poligonaceae and Solanaceae were represented by 4 species (Table 3).

Table 3.
List of weeds present in the municipalities of Aquitania, Soatá, Belén, Panqueba and Garagoa.

Family

Scientific Name

Common Name

Adoxaceae

Viburnum lantana L.

Amargoso

Amarantaceae

Chenopodium ambrosioides L.

Paico

Amaranthaceae

Amaranthus hybridus Kunth

Bledo

Amaranthaceae

Chenopodium album L.

Cenizo

Amaryllidaceae

Allium fistulosum L.

Cebolla junca

Amaryllidaceae

Allium cepa L.

Cebolla cabezona

Apiaceae

Foeniculum vulgare Mill

Hinojo

Apiaceae

Daucus carota L.

Zanahoria

Apiaceae

Hydrocotyle andina Cuatrec.

Oreja de raton

Apiaceae

Arracacia xanthorriza Bancr

Arracacha

Araceae

Philodendron scandens K. Koch & Sello

Hiedra

Araceae

Colocasia esculenta (L.) Schott

Chicolo

Asteraceae

Taraxacum officinale (L.) Weber ex F.H.Wigg.

Diente de león

Asteraceae

Matricaria recutita L.

Manzanilla

Asteraceae

Sonchus oleraceus (L.) L.

Cerraja

Asteraceae

Lactuca sativa L.

Lechuga

Asteraceae

Acmella ciliata (Kunth) Cass.

Risaca

Asteraceae

Acanthospermum hispidum DC.

Silicio

Asteraceae

Bidens pilosa L.

Amor seco

Asteraceae

Galinsoga parviflora Cav.

Upa

Asteraceae

Pentacalia abietina (Willd. ex Wedd.) Cuatrec.

Panque

Asteraceae

Stevia lucida Lag.

Jarilla blanca

Asteraceae

Conyza trihecatactis (S.F. Blake) Cuatrec.

Venadillo

Asteraceae

Ambrosia peruviana Willd.

Altamisa

Asteraceae

Sphagneticola tribulata (L.) Pruski

Boton de oro

Asteraceae

Tanacetum parthenium (L.) Sch.Bip.

Manzanilla silvestre

Asteraceae

Alloispermun caracasanum Lag.

Jarilla

Balsaminaceae

Impatiens balsamina L.

Caracucho morado

Boraginaceae

Symphytum officinale L.

Suelda con suelda

Brasicaceae

Brassica oleracea L.

Repollo

Brasicaceae

Raphanus raphanistrum L.

Nabo

Brasicaceae

Brassica rapa L.

Alpiste

Cariofilaceae

Agrostemma githago L.

Neguilla

Cariofilaceae

Drymaria cordata (L.) Willd. ex Schult.

Golondrina

Compositae

Calendula officcinalis L.

Calendula

Compositae

Bellis perennis L.

Pascua

Crasulaceae

Kalanchoe pinnata (Lam.) Pers.

Hoja santa

Cucurbitaceae

Cucurbita pepo L.

Calabaza

Cyperaceae

Cyperus luzulae (L.) Retz.

Pasto estrella

Cyperaceae

Rhynchospora nervosa Vahl

Tote

Cyperaceae

Cyperus seslerioides Kunth

Toche

Dennstaedtiaceae

Pteridium aquilinum (L.) Kuhn

Helecho

Euforbiaceae

Manihot esculenta Crantz

Yuca

Fabaceae

Trifolium pratense L.

Trebol rojo

Fabaceae

Trifolium repens L.

Trebol blanco

Fabaceae

Vicia faba L.

Habas

Fabaceae

Pisum sativum L.

Arverja

Fabaceae

Mimosa pudica L.

Dormidera

Fabaceae

Senna obtusifolia (L.) H.S. Irwin & Barneby 

La brusca

Fabaceae

Medicago sativa L.

Alfalfa

Fabaceae

Desmodium incanum DC.

Pega Pega

Fabaceae

Senna obtusifolia (L.) H. S. Irwin & Barneby

Bicho

Hypericaceae

Hypericum juniperinum Kunth 

Pino Guarda Rocio

Iridaceae

Gladiolus hybridus C. Morren

Gladiolo

Juncaceae

Juncus effusus L.

Junco

Lamiaceae

Salvia palifolia Kunth

Salvia

Lamiaceae

Salvia aratocensis (J.R.I. Wood & Harley) Fern.Alonso

Velero

Lamiaceae

Ocimum basilicum L.

Albahaca

Lamiaceae

Mentha piperita L.

Hierbabuena

Malvaceae

Malva parviflora L.

Malva

Malvaceae

Sida rhombifolia L.

Escobilla

Malvaceae

Malvastrum coromandelianum (L.) Garcke

Escobilla 1

Melastomataceae

Brachyotum strigosum (L. f.) Triana

Zarcillejo

Musaceae

Musa x paradisiaca L.

Platano

Oxalidaceae

Oxalis filiformis Kunth

Cederita

Oxalidaceae

Oxalis pes-caprae L.

Vinagrillo

Oxalidaceae

Oxalis tuberosa Molina

Ibia

Oxalidaceae

Oxalis acetosella L.

Platanillo

Papaveraceae

Fumaria officinalis L.

Fumaria

Plantaginaceae

Plantago major L.

Yanten

Plantaginaceae

Scoparia dulcis L.

Mastuerzo

Poaceae

Zea mays L.

Maiz

Poaceae

Brachiaria mutica (Forssk.) Stapf

Pasto paja

Poaceae

Cenchrus clandestinus (Hochst. ex Chiov.) Morrone

Pasto kikuyo

Poaceae

Dactylis glomerata L.

Pasto azul

Poaceae

Holcus lanatus L.

Falsa poa

Poaceae

Eleusine indica (L.) Gaertn.

Pasto burro

Poaceae

Lolium perenne L.

Pasto Raigrás

Poaceae

Urochloa mutica (Forssk.) T.Q. Nguyen

Pasto para

Poaceae

Urochloa decumbens (Stapf) R.D. Webster

Pasto brecharia

Poaceae

Cenchrus purpureum Schumach.

Pasto taiwan

Poaceae

Hyparrhenia rufa (Nees) Stapf

Pasto jaragua

Poaceae

Holcus lanatus L.

Pasto poa

Poaceae

Megathyrsus maximus (Jacq.) B.K. Simon & Jacobs

Pasto guineo

Poaceae

Cynodon dactylon (L.) Pers.

Pasto Comun

Poaceae

Triticum aestivum L.

Trigo

Poaceae

Phalaris arundinaceae L.

Pasto brasilero

Poaceae

Cortaderia nítida (Kunth) Pilg

Cortadera

Poaceae

Dactylis glomerata L.

Pasto grama

Poligonaceae

Polygonum segetum Kunth

Barbasco

Poligonaceae

Rumex crispus L

Romaza o lengua de vaca

Poligonaceae

Polygonum hydropiperoides Michx.

Gualola

Polygonaceae

Rumex acetosella L.

Envidia

Portulaceae

Portulaca oleracea L.

Verdolaga

Rosaceae

Rubus eriocarpus Liebm.

Mora silvestre

Rosaceae

Acaena elongata L.

Cadillo

Rutaceae

Ruta graveolens L.

Ruda

Saccolomataceae

Saccoloma inaequale (Kunze) Mett

Helecho macho

Sapindaceae

Cardiospermum halicacabum L.

Globitos

Solanaceae

Physalis peruviana L.

Uchuva

Solanaceae

Solanum tuberosum L.

Papa

Solanaceae

Solanum nigrum L.

Moro

Solanaceae

Solanum americanum Mill.

Hierbamora

Tropeolaceae

Tropaeolum tuberosum Ruiz & Pav.

Cubios

Urticaceae

Boehmeria nivea (L.) Gaudich.

Ramio

Urticaceae

Urtica dioica L.

Ortiga

Valerianaceae

Valeriana officinalis L.

Valeriana

Verbenaceae

Verbena litoralis Kunth

Verbena

Zygophyllaceae

Tribulus terrestris L.

Abrojo

Source: Authors.

In the municipality of Belén, 37 species of weeds belonging to 18 families and 35 genera were identified. The three most represented families were Poaceae (8 species), followed by Asteraceae with 5 species and Fabaceae with 4 species. For the municipality of Soatá, 33 species of weeds belonging to 15 families and 31 genera were identified. The three most representative families were Poaceae with 7 species, followed by Asteraceae with 6 species and Fabaceae with 3 species. In the municipality of Panqueba, 35 species of weeds belonging to 15 families and 31 genera were identified. The most represented families were Poaceae with 7 species, followed by Asteraceae with 6 species and Fabaceae with 5. In the municipality of Aquitania, 44 species of weeds belonging to 21 families and 41 genera were identified. The most representative families were Poaceae with 7 species, followed by Asteraceae with 5 species and Fabaceae with 5 species. In the municipality of Garagoa, 37 species of weeds belonging to 23 families and 36 genera were identified. The most represented families were Asteraceae with 7 species, Poaceae with 5 species and Poligonaceae with 3. Thus, as can be seen, the greatest relative number of species and genera was observed in Panqueba and the greatest diversity of families in Garagoa (Fig. 2).

Fig. 2. Number of families, genera and species identified in each municipality.
Source: Authors.

A. Biodiversity indexes

Table 4 shows the biodiversity indexes by farm in the municipality of Belén. The abundance of weed species was quite variable among the farms in the municipality. The farm with the highest relative abundance with 12.5% was Meseta and the lowest was El Chital with only 5.63%. There was also great variability in the number of weed species. Four farms had the highest specific richness; La Primavera (13), Ojo de Agua, El Pino and Buenos Aires with 12 species. The Margalef diversity index showed a maximum of 3.68 (La Primavera) and a minimum of 1.04 in El Chital. The minimum value in the equity index was 1.09 (El Chital) and the maximum was 2.32 at the Primavera farm. The species dominance index had a maximum value of 0.43 (El Chital) and a minimum of 0.12 for El Pino and Buenos Aires (Table 4).

Table 4.
Biodiversity indicators for farms in the municipality of Belén

Farm

Abundance (N)

Relative abundance (%)

Specific richness (S)

Margalef diversity (DMg)

Fairness (Shannon-Wiener) H

Dominance (Simpson)

1

Peña Colorada

20

6.25

9

2.67

1.94

0.19

2

Ojo de Agua

33

10.31

12

3.15

2.25

0.13

3

El Aguirre

34

10.63

11

2.84

2.01

0.19

4

El Chital

18

5.63

4

1.04

1.09

0.43

5

Hoya

19

5.94

8

2.38

1.91

0.17

6

El Cardón

26

8.13

5

1.23

1.41

0.27

7

El Pino

25

7.81

12

3.42

2.29

0.12

8

Buenos Aires

35

10.94

12

3.09

2.30

0.12

9

Puerto Nuevo

23

7.19

5

1.28

1.29

0.35

10

El Morito

21

6.56

7

1.97

1.62

0.26

11

La Meseta

40

12.50

8

1.90

1.79

0.21

12

La Primavera

26

8.13

13

3.68

2.32

0.13

Average

26.67

8.33

8.83

2.39

1.85

0.21

Standard deviation

7.19

2.25

3.16

0.90

0.42

0.10

Source: Authors.

The Table 4 also show the variability in the indices: relative abundance (2.25%) and specific richness (3.16) in particular. Five (5) farms present equity indexes between 2 and 3.5 considered medium and 4 farms present dominance indexes lower than 0.17 considered as low [13].

The Cluster Analysis (CA) carried out for the four biodiversity indicators resulted in three groups of farms (Fig. 3). In the first one, there were five (5) farms located within the red oval: El morito, La maceta, Peña Colorada, Hoya and El Aguirre, characterized by a specific richness range between 7 and 11, Margalef diversity between 1.90-2.84, equity between 1.62-2.01 and a dominance index of less than 0.3. In the second grouping, three (3) farms were located within the green oval: El chital, El cardón and Puerto nuevo, characterized because the specific richness is lower in the range 4-5; the diversity between 1.04 -1.41; the equity index between 1.09-1.41 and the dominance index between 0.27-0.43. In the third blue oval four farms were grouped: La primavera, El pino, Ojo de agua and Buenos Aires, they are characterized because the specific richness is in a range of 12-13; the diversity between 3.09-3.68; the equity between 2.25-2.32 and the dominance index is the lowest relative value with a range of 0.12-0.13.

Fig. 3. Grouping of farms according to biodiversity indicators in the municipality of Belén.
Source: Authors.

In the municipality of Soatá, the farm with the highest relative abundance was El Gaque with 16.11% and the lowest was Copa de Oro with 2.78%. Four farms represented the highest number of species: La Palma (9), Ronquilla (6), Los Laureles and El Gaque (5). The Margalef diversity index obtained a maximum of 2.52 (La Palma) and a minimum of 0.62 in Copa de Oro. Regarding equity, the minimum was 0.67 (Copa de Oro) and the maximum was 2.08 (La Palma), and regarding the species dominance index, the maximum value was 0.52 (Copa de Oro) and the minimum was 0.14 (La Palma) (Table 5). In this municipality, only one farm had an equity above 2, considered medium, and this one had a dominance lower than 0.17, considered low (La Palma) [13].

Table 5.
Biodiversity indicators for the municipality of Soatá.

Farm

Abundance (N)

Relative abundance (%)

Specific richness (S)

Margalef diversity (DMg)

Fairness (Shannon-Wiener) H

Dominance (Simpson)

1

Ronquilla

27

15.00

6

1.52

1.63

0.22

2

El Ralo

19

10.56

3

0.68

1.02

0.39

3

Gallinacera

18

10.00

4

1.04

1.36

0.27

4

La Palma

24

13.33

9

2.52

2.08

0.14

5

El Almorzadero

8

4.44

4

1.4

1.32

0.28

6

Los Laureles

11

6.11

5

1.67

1.52

0.24

7

El Cito

6

3.33

3

1.12

1.01

0.39

8

Florencia

6

3.33

3

1.12

1.01

0.39

9

La Primavera

18

10.00

4

1.04

1.33

0.28

10

Gallinero

9

5.00

3

0.91

1.06

0.36

11

Copa de Oro

5

2.78

2

0.62

0.67

0.52

12

El Gaque

29

16.11

5

1.19

1.34

0.31

Average

15.00

8.33

4.25

1.24

1.28

0.32

Standard deviation

8.26

4.59

1.79

0.49

0.35

0.10

Source: Authors.

The multivariate analysis in the municipality of Soatá allowed grouping the farms into three groups based on their similarity. In the first group there was one (1) farm corresponding to the red grouping called La Palma, characterized because the richness, diversity and equity indexes are higher than 2.0 and its dominance is the lowest relative value, being 0.14. In grouping 2, six (6) farms (green color) were located: La Ronquilla, Los Laureles, Gallinacera, La Primavera, El Almorzadero and El Gaque, characterized because the specific richness is in a range of 4-6; the diversity between 1.04 -1.67; the equity index between 1.32-1.1.63 and the dominance index in a range of 0.22-0.31. Finally, in the third grouping there were farms (5) farms (blue color) where the following farms are found: Copa de Oro, El cito, Florencia, El ralo and Gallinero; they are characterized because the specific richness is in a range of 2-3; the diversity between 0.62-1.12; the equity index between 0.67-1.02 and the dominance index between 0.36-0.52 (Fig. 4).

Fig. 4. Grouping of farms according to biodiversity indicators in the municipality of Soatá.
Source: Authors.

The farm with the highest relative abundance of weeds in the municipality of Panqueba was El Recuerdo with 12.38% and the lowest was Cuatro Esquinas with 4.17%. Three farms had the highest number of species (8): La Rinconada, El Recuerdo and El Reposo. The Margalef diversity index showed a maximum of 1.61 (El Reposo) and a minimum of 0.53 in Santo Domingo. With respect to equity, the minimum was 1.05 (Santo Domingo) and the maximum was 2.05 (El Reposo) and with respect to the species dominance index, the maximum value was 0.37 (Santo Domingo) and the minimum was 0.13 (El Reposo) (Table 6). Only two farms had an equity above 2, considered medium, while 4 farms (including the three previous ones) had dominances below 0.17, considered low [13].

Table 6.
Biodiversity indicators in the municipality of Panqueba.

Farm

Abundance (N)

Relative abundance (%)

Specific richness (S)

Margalef diversity (DMg)

Fairness (Shannon-Wiener) H

Dominance (Simpson)

1

Los fiquetones

88

10.48

7.00

1.34

1.85

0.17

2

Laguna de Ruchical

60

7.14

6.00

1.22

1.73

0.19

3

Cuatro Esquinas

35

4.17

6.00

1.41

1.70

0.20

4

Oreganillal

70

8.33

5.00

0.94

1.57

0.22

5

Picachito

55

6.55

5.00

1.00

1.53

0.23

6

El Uvo

79

9.40

6.00

1.14

1.72

0.19

7

La Rinconada

89

10.60

8.00

1.56

2.03

0.14

8

El Carmen

55

6.55

4.00

0.75

1.28

0.31

9

El Recuerdo

104

12.38

8.00

1.51

2.00

0.15

10

El Reposo

78

9.29

8.00

1.61

2.05

0.13

11

Santo Domingo

45

5.36

3.00

0.53

1.05

0.37

12

El Tuno

82

9.76

7.00

1.36

1.93

0.15

Average

70.00

8.33

6.08

1.20

1.70

0.20

Standard deviation

20.29

2.42

1.62

0.34

0.31

0.07

Source: Authors.

The multivariate analysis in the municipality of Panqueba allowed grouping the farms into four groups based on their similarity. In the first group there were two (2) farms corresponding to the red grouping. In this grouping are the farms: El Carmen and Santo Domingo, characterized by a relatively lower range of specific richness, between 3-4; the Margalef diversity is between 0.53-0.75; equity is between 1.05-1.28 and the dominance index is greater than 0.3 (Fig. 5). In group 2 there were two (2) farms (green color): Organillal and Picachito, which are characterized because the specific richness is only 5; the diversity is between 0.94 -1; the equity index is between 1.53-1.57 and the dominance index is between 0.22-0.23. In the third grouping there were five (5) farms (light blue color). The farms Los Fiquetones, El Tuno, Cuatro Esquinas, Laguna Ruchical and El Uvo are characterized by a range of specific richness between 6-7; the Margalef diversity is between 1.14-1.41; the equity is between 1.70-1.93 and the dominance index in a range of 0.15-0.20. Finally, in the fourth grouping there were three (3) farms El Recuerdo, La Rinconada and El Reposo, these are identified by a richness of 8, relatively higher; the Margalef diversity is between 1.51-1.61; the equity is between 2-2.05 and the dominance index between 0.13-0.15 (Fig. 5).

Fig. 5. Grouping of farms according to biodiversity indicators in the municipality of Panqueba.
Source: Authors.

The farm with the highest relative abundance of weeds in the municipality of Aquitania was Encenecillo with 12% and the lowest was La Laja 1 with 4%. Two farms had the highest number of species (14) Tomita 2 and Encenecillo and Ladera. The Margalef diversity index showed a maximum of 3.29 (Tomita 2) and a minimum of 1.55 in Las Pilas. With respect to equity, the minimum was 1.78 (Las Pilas) and the maximum was 2.30 (Tomita 2) and with respect to the species dominance index, the maximum value was 0.19 (Las Pilas) and the minimum was 0.10 (Encenecillo and Ladera) (Table 7). In general, eight farms had an index of medium equity and none high, while only two farms could be considered high dominance [13], so the farms in this municipality could be considered to have a more favorable relative situation than the previous ones.

Table 7.
Biodiversity indicators in the municipality of Aquitania.

Farm

Abundance (N)

Relative abundance (%)

Specific richness (S)

Margalef diversity (DMg)

Fairness (Shannon-Wiener) H

Dominance (Simpson)

1

Tomita 2

52

9

14

3.290

2.308

0.135

2

El Romero

49

8

8

1.799

1.993

0.148

3

Cañada Honda

48

8

12

2.842

2.249

0.121

4

Buenavista

46

8

7

1.567

1.834

0.174

5

El Espinal

41

7

8

1.885

2.014

0.141

6

La Laja

52

9

8

1.772

1.877

0.180

7

El Colorado

58

10

11

2.463

2.181

0.137

8

La Laja 1

26

4

10

2.762

2.228

0.115

9

Las pilas

47

8

7

1.558

1.787

0.195

10

Las cañas

46

8

11

2.612

2.260

0.114

11

Encenecillo y Ladera

72

12

14

3.040

2.459

0.103

12

San Fernando

51

9

12

2.798

2.357

0.106

Average

49.00

8

10.17

2.37

2.13

0.14

Standard deviation

10.65

2

2.55

0.61

0.22

0.03

Source: Authors.

In the municipality of Aquitania, the farms were classified into four groups. In the first group there were three (3) farms corresponding to the red group. In this grouping are the following farms: El Colorado, La Laja 1 and Las Cañas, characterized by a relatively high range of specific richness, between 10-11; the Margalef diversity is between 2.46-2.76; equity is between 2.18-2.26 and dominance is between 0.11-0.13. In the second green group, there were two farms, Tomita 2 and Encenecillo y Ladera, because their specific richness is the highest in the municipality (14); Margalef diversity is between 3.04-3.29; equity is between 2.30-2.45 and dominance is the lowest (0.103). The third group corresponds to the light blue sector where the farms Las Pilas, La laja, Buenavista, El Romero and El Espinal share similarity due to their specific richness is between 7 and 8; Margalef diversity is between 1.55-1.88; equity is between 1.78 and 2.01 and dominance is between 0.14-0.19. Finally, the purple grouping 4 corresponds to the Cañada Honda and San Fernando farms, where the specific richness is 12; the Margalef diversity is between 2.79-2.84; the equity is between 2.24-2.35 and the dominance is between 0.10-0.11 (Fig. 6).

Fig. 6. Grouping of farms according to biodiversity indicators in the municipality of Aquitania.
Source: Authors.

The farm with the highest relative abundance of weeds in the municipality of Garagoa with 11% was San José and the lowest was Granja Guaney with 5%. Three (3) farms had the highest number of species, San José (11) and Betania and La Rivera with 9. The Margalef diversity index showed a maximum of 2.54 (San José) and a minimum of 0.91 in El Arrayan. Regarding equity, the minimum was 1.16 (El Arrayan) and the maximum was 2.07 (La Rivera) and regarding the species dominance index, the maximum value was 0.35 (El Arrayan) and the minimum was 0.14 (Betania) (Table 8). In the municipality of Garagoa, only three farms presented an equity above 2, considered medium, and three (coinciding with the previous ones) with dominances below 0.17, considered low [13], which denotes an unfavorable situation in terms of biodiversity indicators of arboreal species.

Table 8.
Biodiversity indicators in the municipality of Garagoa.

Farm

Abundance (N)

Relative abundance (%)

Specific richness (S)

Margalef diversity (DMg)

Fairness (Shannon-Wiener) H

Dominance (Simpson)

1

El Pincel

35

8

5

1.125

1.238

0.344

2

La Realidad

40

9

7

1.627

1.575

0.258

3

El bosque

34

7

8

1.985

1.788

0.197

4

Portin

36

8

6

1.395

1.445

0.285

5

Los pinos

39

8

6

1.365

1.569

0.240

6

Betania

44

10

9

2.114

2.056

0.142

7

El arrayan

27

6

4

0.910

1.165

0.353

8

San Luis

36

8

8

1.953

1.824

0.199

9

La Rivera

47

10

9

2.078

2.072

0.143

10

La quinta

47

10

6

1.299

1.602

0.226

11

San José

51

11

11

2.543

2.036

0.168

12

Granja Guaney

23

5

6

1.595

1.640

0.214

Average

38.25

8

7.08

1.67

1.67

0.23

Standard deviation

8.26

2

1.98

0.48

0.30

0.07

Source: Authors.

The multivariate analysis in the municipality of Garagoa allowed grouping the farms into three groups. In the first group there were five (5) farms corresponding to the red grouping. The farms San José, El Bosque, San Luis, Betania and La Rivera are characterized by a range of specific richness between 8 and 11; the Margalef diversity is between 1.95 and 2.54; equity is between 1.78 and 2.07, and dominance is between 0.14-0.19. In grouping 2 of green color are the farms: El Pincel and El Arrayan are characterized because the range of their specific richness is the lowest, between 4 and 5; the Margalef diversity is between 0.91-1.12; the equity is between 1.16 and 1.23 and the dominance index is higher than 0.3. The last grouping is group 3, which corresponds to the light blue color. Here we find the farms La Realidad, Portin, Los Pinos, Granja Guaney and La Quinta. They are related because the range of their specific richness is between 6 and 7; their Margalef diversity is between 1.29-1.62; equity is between 1.44-1.64 and dominance is between 0.21-0.28 (Fig. 7).

Fig. 7. Grouping of farms according to biodiversity indicators in the municipality of Garagoa.
Source: Authors.

B. Biodiversity indicators by municipality

When analyzing the biodiversity indicators for each municipality, it became evident that the highest relative number of species was found in the municipality of Aquitania with a total of 44, and the lowest in Soatá. The Margalef Diversity index obtained a maximum in the municipality of Aquitania (6.59) and a minimum in Panqueba with a result of 5.20, although both extremes can be valued as good. With respect to equity the highest municipality was Panqueba with 3.31 and the lowest Garagoa with 2.57 both considered high [13]. The species dominance index was higher in Belén and Garagoa with a value of 0.14, and for the rest 0.04 considered low [13] (Table 9).

Table 9.
General biodiversity indicators for the municipalities of Belén, Soatá, Panqueba, Aquitania and Garagoa.

Municipalities

Specific Wealth

Diversity

Fairness

Dominance

Belén

37

6.24

2.65

0.14

Soatá

33

6.16

2.95

0.04

Panqueba

35

5.20

3.31

0.04

Aquitania

44

6.59

3.01

0.05

Garagoa

37

5.71

2.57

0.14

Source: Authors.

In the first grouping, 2 municipalities were located within the orange oval: Panqueba and Soatá, which are characterized because their specific richness was 35 and 33 respectively; the diversity between 5.20 and 6.16; the index of equity between 2.95 and 3.31 and the index of dominance between 0.05 and 0.04. In the second grouping was the municipality of Aquitania, located within the green oval, characterized by a specific richness index of 44; Margalef’s diversity index of 6.59; equity index of 3.31 and dominance index of 0.5. Two municipalities were grouped in the third blue oval: Garagoa and Belén, in them their specific richness it was 37; diversity between 5.71 and 6.24; equity between 2.65-3.01 and a relatively high dominance within the group with 0.14 (Fig. 8).

Fig. 8. Grouping by municipality according to biodiversity indicators.
Source: Authors.

In general, 109 species were recorded in the plots of the 60 farms; however, the arithmetic sum of the total number of species in the five municipalities was 186, with a maximum of 44, a minimum of 33 and an average of 37.2, indicating a low level of coincidence or repetition of species in the different municipalities, which may be due to the low ecological plasticity of many of them.

The families with the highest representation of species were Poaceae, Asteraceae and Fabaceae, but it is known that Poaceae and Asteraceae are among the families with the highest number of species in the world [14]. The dominance of these two families in this study may be due to the large number of species they have in various ecosystems as has been mentioned by some authors [15].

The level of species richness of Poaceae in the farms is related to other research where it is mentioned that this botanical family is considered one of the most extensive worldwide, with about 700 genera and about 11 000 species [16]. The predominance of Poaceae species in the farms sampled in the municipalities under study may be related to the adaptability to conditions characteristic of cold climate thermal floors, which makes some of these plant species to adapt more easily. On the other hand, the morphology of root systems and leaves is involved, which contribute to optimize water and nutrient uptake and generate resistance to water stress [17]. It is also necessary to consider the use of soils of the farms where most of them were dedicated to native savanna, fallow, sugarcane, and pastures with abundant weeds of the Poaceae family.

Among the Poaceae, P. clandestinum was observed in the five municipalities, which is a perennial species with a rhizomatic root system, which allows this plant to compete for space and cover. Because it has been used as a crop for animal consumption, fertilization plans have been used, making the plant more competitive with others [18].

In the group of Asteraceae, Sonchus oleraceus L stood out in all the municipalities, which could be due to its easy adaptability, since in spite of its fragile aspect, it grows easily in diverse environmental conditions, supporting sudden changes of temperature; being limiting in transitory crops [19]. This species of arvense has been reported for years as one of the most important for the cultivation of sugarcane in Cuba, especially since it can abound both in dry and lowlands and in wetlands on the banks of irrigation canals [20].

Regarding the Fabaceae, Trifolium repens L. stood out in the five municipalities. This leguminous species is responsible for fixing nitrogen, favoring infiltration and soil biodiversity. In addition, it is a plant with a two- or three-year cycle, so it can accumulate seeds and be aggressive for the establishment of transitory crops, although it can be useful as a cover for fruit trees. On the other hand, it is favorable for attracting pollinators [21].

Another species observed in the five municipalities was Rumex crispus L. whose colonization or distribution is due in many cases to chemical processes or allelopathies, which are widely present in agroecosystems according to some authors [22].

In three of the municipalities studied, the presence of species such as Bidens pilosa L. and Taraxacum officinale L., characterized by their broad leaves, was highlighted; these are considered aggressive weeds due to their high capacity to colonize and compete with transitory crops that will be planted on the farms, such as corn, beans, onions and peas. This type of species is characterized by being adaptable to different weeds, since within their morphology they have deep root systems, causing greater affectation when there is more coverage, interfering with the established plantations for nutrients, water and light [23].

The presence of species of the genus Oxalys is to be considered since it was evidenced in three municipalities and studies record that specimens of this genus cause great interference in the peach crop [24] which will be planted in several models of Soatá and Panqueba.

To evaluate the specific species richness, the Margalef index was used, which mentions that an index with values lower than 2.00 denotes a low species richness and, on the contrary, values close to 5.00 or higher reflect a high species richness [13]. Considering the above mentioned and knowing the results obtained in each municipality, it can be noted that all values are higher than 5.0, which indicates a high biodiversity, being Aquitania the one with the highest relative biodiversity of weeds with 6.59. When estimating the biological diversity of the areas under study, the Shannon index was calculated, considering that its normal value is between 2 and 3. The five municipalities are within the normal range and even with high diversity indexes, Panqueba being the highest with a value of 3.31 and Garagoa the lowest with 2.57. According to what was established by these authors, it can be mentioned that the municipalities under study presented high species richness, moderate or medium diversity and low dominance since all values were < 0.17, which did not occur at the farm level as could be observed previously when the farms within each municipality were analyzed.

IV. Conclusions

The study determined the presence of 109 species of weeds in 93 genera and 38 botanical families, the most representative families being Poaceae, Asteraceae and Fabaceae and the genera Penisetum, Solanum, Dactylis, Trifolium and Oxalis.

From the point of view of their agricultural importance, the species most frequently present in the municipalities were: P. clandestinum, Sonchus oleraceus L, Trifolium repens, Rumex crispus.

Within each municipality, the levels of abundance, relative abundance and biodiversity indicators varied, resulting in general in a low to medium index of species equity in the farms and a predominantly high dominance index.

The variability of the farms within each municipality resulted in the discrimination of three groupings in Belén Garagoa and Soata, and four in Aquitania and Panqueba according to their similarity in the biodiversity indicators of the weeds.

Considering the biodiversity indices estimated in general, the five municipalities presented a high richness of weed species, medium diversity and equity indicators, and low dominance.

Acknowledgments

The authors would like to thank the Governor’s Office of the Department of Boyacá, which financed the project: “Implementation of associative agricultural models with traditional crops for economic and environmental management in the Department of Boyacá. They also thank the BoyacáAgro Project team and the University of Pamplona for the opportunity to work on the project, which provided the necessary resources to carry out the research and obtain the pertinent information for the preparation of this article.

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Harold Bautista González. Universidad de Pamplona (Norte de Santander, Colombia).

Leonides Castellanos González. Universidad de Pamplona (Norte de Santander, Colombia).

Gladys Montañez. Universidad de Pamplona (Norte de Santander, Colombia).