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Diurnal and seasonal variations on soil CO 2 fluxes in tropical silvopastoral systems
Author(s) -
AdameCastro Diana E.,
Aryal Deb R.,
VillanuevaLópez Gilberto,
LópezMartínez Jorge O.,
ChayCanul Alfonso J.,
CasanovaLugo Fernando
Publication year - 2020
Publication title -
soil use and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.709
H-Index - 81
eISSN - 1475-2743
pISSN - 0266-0032
DOI - 10.1111/sum.12644
Subject(s) - relative humidity , environmental science , diurnal temperature variation , dry season , water content , leucaena , wet season , morning , leucaena leucocephala , panicum , moisture , agronomy , hydrology (agriculture) , atmospheric sciences , chemistry , ecology , geography , botany , biology , geotechnical engineering , organic chemistry , meteorology , engineering , geology
This study aimed to quantify the dynamics of soil CO 2 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 CO 2 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 CO 2 fluxes ranged from 6.0 ± 0.14 to 6.1 ± 0.12 µmol CO 2 /m 2 /s but no statistical differences were observed between systems. Soil CO 2 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, CO 2 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 CO 2 fluxes in silvopastoral systems correlated positively with soil temperature and ambient temperature, but negatively with relative humidity. We concluded that soil CO 2 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 CO 2 fluxes from extensive livestock production lands.