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- W4309491356 abstract "In weathered tropical soils, the inherent pedoclimatic characteristics strengthen the role of soil organic matter (SOM) pools within carbon cycle for both forest and agricultural ecosystems. The fast SOM turnover and the humid climate hasten the impact of land use and emphasize the importance of water extractable organic matter (WEOM) on soil organic carbon (SOC) dynamics. The goal of this study was to determine the short-term dynamics of bulk SOM and WEOM pool in weathered Brazilian soil, as conditioned by both land use and type of plant inputs. To this aim we used the appraisal of natural δ13C-OC signature to follow the variation of SOC pools and to overcome the analytical issues related to low OC concentration of WEOM fractions. In one-year laboratory incubation soil samples from natural forest and an adjacent site under sugarcane monoculture. were amended with either forest litter or sugarcane straw to evaluate SOM and WEOM dynamics. The bulk SOM was mainly affected by inherited conditions rather than on the organic amendments. The incorporation of sugarcane residues in the forest site produced a partial replacement of original SOC, while the amendments of cultivated soil promoted a stable increase of SOC. The analysis of WEOM highlighted its influence as reactive pool in the short-term SOM dynamics. The δ13C variation of WEOM from cultivated soil corroborated the significant ponderal rate of OC input from forest litter that accounted for the 22% of total dissolved carbon. Unexpected evidence on the shift of isotopic dilution between SOC pools indicate that the evaluation of δ13C to determine the origin of the SOC fraction should be conservatively adopted. The results outline that the steady state of SOM in forest systems may undergo a rapid decline with limited counteracting effects of exogenous OM inputs. Conversely, OC depleted agricultural soils, may benefit of organic amendments thus acting as effective sink for SOC accumulation" @default.
- W4309491356 created "2022-11-28" @default.
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- W4309491356 date "2022-12-20" @default.
- W4309491356 modified "2023-10-16" @default.
- W4309491356 title "Influence of land use and different plant residues on isotopic carbon distribution of total and water extractable organic matter in an incubation experiment with weathered tropical soil" @default.
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- W4309491356 doi "https://doi.org/10.1002/ldr.4539" @default.
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