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Diurnal and seasonal variations on soil CO2 fluxes in tropical silvopastoral systems

Adame Castro, Diana E [autora] | Aryal, Deb Raj [autor] | Villanueva López, Gilberto [autor] | López Martínez, Jorge Omar [autor] | Chay Canul, Alfonso Juventino [autor] | Casanova Lugo, Fernando [autor].
Tipo de material: Artículo en línea Artículo en línea Tipo de contenido: Texto Tipo de medio: Computadora Tipo de portador: Recurso en líneaTema(s): Dióxido de carbono | Humedad de suelos | Temperatura del suelo | Sistemas silvopastoriles | Leucaena leucocephala | Panicum maximum | Cynodon plectostachyus | GanaderíaTema(s) en inglés: Carbon dioxide | Soil moisture | Soil temperature | Silvopastoral systems | Leucaena leucocephala | Panicum maximum | Cynodon plectostachyus | LivestockDescriptor(es) geográficos: Othón P. Blanco (Quintana Roo, México) Nota de acceso: Disponible para usuarios de ECOSUR con su clave de acceso En: Soil Use and Management. Volumen 36, número de 4 (August 2020), páginas 671–681. --ISSN: 1475-2743Número de sistema: 61155Resumen:
Inglés

This study aimed to quantify the dynamics of soil CO2 fluxes in two silvopastoral systems based on Leucaena leucocephala, one associated with Panicum maximum (L + P) and another with Cynodon plectostachyus (L + C). We measured CO2 fluxes fortnightly during the dry and rainy seasons in the morning and the afternoon, with an infrared gas analyzer. Simultaneously, we measured soil temperature, soil moisture, ambient temperature, and relative humidity. Soil CO2 fluxes ranged from 6.0 ± 0.14 to 6.1 ± 0.12 µmol CO2/m²/s but no statistical differences were observed between systems. Soil CO2 flux in the L + P was 12.5% higher in the rainy season compared with the dry season but the season did not affect the fluxes in L + C. Regarding the diurnal variation, CO2 fluxes were 17.6%–34.8% higher in the morning compared with afternoon measurements. Soil moisture and temperature were higher in L + C, but the ambient temperature and relative humidity showed no statistical differences between systems. In both systems, soil temperature was greater in the afternoon, while the soil moisture and relative humidity were greater in the morning. The diurnal variation of soil CO2 fluxes in silvopastoral systems correlated positively with soil temperature and ambient temperature, but negatively with relative humidity. We concluded that soil CO2 fluxes did not vary between silvopastoral systems but respond differently to the seasons. The results have important implications on the establishment and management of Leucaena-based silvopastoral systems for the mitigation of soil CO2 fluxes from extensive livestock production lands.

Recurso en línea: https://doi.org/10.1111/sum.12644
Lista(s) en las que aparece este ítem: GANADERIA SUSTENTABLE Y CAMBIO CLIMATICO
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Disponible para usuarios de ECOSUR con su clave de acceso

This study aimed to quantify the dynamics of soil CO2 fluxes in two silvopastoral systems based on Leucaena leucocephala, one associated with Panicum maximum (L + P) and another with Cynodon plectostachyus (L + C). We measured CO2 fluxes fortnightly during the dry and rainy seasons in the morning and the afternoon, with an infrared gas analyzer. Simultaneously, we measured soil temperature, soil moisture, ambient temperature, and relative humidity. Soil CO2 fluxes ranged from 6.0 ± 0.14 to 6.1 ± 0.12 µmol CO2/m²/s but no statistical differences were observed between systems. Soil CO2 flux in the L + P was 12.5% higher in the rainy season compared with the dry season but the season did not affect the fluxes in L + C. Regarding the diurnal variation, CO2 fluxes were 17.6%–34.8% higher in the morning compared with afternoon measurements. Soil moisture and temperature were higher in L + C, but the ambient temperature and relative humidity showed no statistical differences between systems. In both systems, soil temperature was greater in the afternoon, while the soil moisture and relative humidity were greater in the morning. The diurnal variation of soil CO2 fluxes in silvopastoral systems correlated positively with soil temperature and ambient temperature, but negatively with relative humidity. We concluded that soil CO2 fluxes did not vary between silvopastoral systems but respond differently to the seasons. The results have important implications on the establishment and management of Leucaena-based silvopastoral systems for the mitigation of soil CO2 fluxes from extensive livestock production lands. eng

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