Microbial necromass carbon dominates the accumulation of soil organic carbon in bedrock-exposed areas of karst regions

Our objectives were to 1) elucidate the response patterns of plant- and microbially derived necromass carbon components to bedrock exposure gradients and determine their quantitative contributions to SOC; 2) reveal the potential regulatory pathways of the biological and abiotic factors changed by the outcrop of bedrock on plant-derived and microbially derived carbon, and quantify their importance via machine learning approaches.This data reveals the variations of biological and abiotic elements with the exposure rate of bedrock.