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.