Data of rhizospheric C.xlsx

The rhizospheric carbon (C), as the most sensitive terrestrial C, has been considered an essential link between atmospheric, plant, and soil material circulation. However, the spatial patterns and driving factors of rhizosphere effect on soil C still lack systematic quantification, especially for the global agroecosystem. With 748, 294, and 695 paired data of soil organic carbon (SOC), dissolved organic carbon (DOC), and soil microbial biomass carbon (SMBC) from 154 target literature, together with 25 biotic and abiotic variables across global agro-ecosystem, the rhizosphere significantly increased SOC, DOC, and SMBC by 7.03%, 34.59%, and 26.09% compared with bulk soil, respectively. The rhizosphere effect on SOC and DOC was significant differences under various climate zone, aridity indexes, and crop types, but this phenomenon did not occur in SMBC. In addition to aridity index, crop types, initial soil C, and soil pH, soil available nutrients dominantly regulated the rhizospheric SOC, while SMBC played a small role in regulating the rhizospheric DOC. Path analysis showed a network of inter-correlation of climate, soil physicochemical properties, and SMBC in determining the rhizosphere effect on SOC and DOC. Understanding the mechanism of rhizospheric C accumulation is of theoretical significance for accurately forecasting soil C dynamics and promoting plant production efficiency by regulating soil C and nutrients cycling in the global agro-ecosystem.