Characterization of the seed bank of four agroecosystems in La Frailesca, Chiapas, Mexico
The objective of the study was to determine the dynamics of weeds of the seed bank in the representative agro-ecosystems of the tropical region of Frailesca, in the state of Chiapas, Mexico. The systems studied were: the fertile soils (river banks), paddock (grasslands), intermediate lands for the c...
| Autores: | , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2020 |
| País: | Ecuador |
| Institución: | Universidad Central del Ecuador |
| Repositorio: | Revista Siembra |
| Idioma: | español |
| OAI Identifier: | oai:revistadigital.uce.edu.ec:article/2240 |
| Acceso en línea: | https://revistadigital.uce.edu.ec/index.php/SIEMBRA/article/view/2240 |
| Access Level: | acceso abierto |
| Palabra clave: | agroecosistemas arvenses reservorio semillas agroecosystems weed reservoir seeds |
| Sumario: | The objective of the study was to determine the dynamics of weeds of the seed bank in the representative agro-ecosystems of the tropical region of Frailesca, in the state of Chiapas, Mexico. The systems studied were: the fertile soils (river banks), paddock (grasslands), intermediate lands for the cultivation of corn and in secondary succession (acahual). The methodology of weed characterization consisted on direct seed germination of seed of weed from three soil layers: 0-10, 10-20 and 20-30 cm. Soil samples from these soil layers were placed in trays of 50 x 30 x 10 cm. Each system and soil layer were replicated three times with a total of 36 total sampling units (trays). Trays were placed in a greenhouse and contamination with other seeds was avoided. The variables evaluated were the number of emerged weed species and the number of individuals per weed species, density and relative dominance, floristic diversity and community similarities, and allelopathic effects of the dominant weeds. The results indicate that the intensively managed systems with agricultural activities specifically in fertile and intermediate lands for corn monoculture presented more dynamic seed banks, which occurred in the first 10 cm depth of the soil. The dominant weed species were Cyperus rotundus L. and Melampodium divaricatum Rich. Floristic diversity determined similar indices between systems and depths. The greatest similarities between communities was found among the agroecosystems managed at corn cultivation. No allelopathic effects of the dominant species on the germination and growth of the representative crops in the region were determined. |
|---|