Transformation and distribution of straw-derived carbon in soil and the effects on soil organic carbon pool: A review.

doi:10.13287/j.1001-9332.201902.026

Abstract

Abstract: Farmland soil organic carbon (SOC) pool is a crucial component of global carbon cycle. Due to the widely-implemented straw returning, crop straws have become the primary exogenous carbon source for agricultural soils. The conversion and distribution of straw-derived carbon in soil directly affect the composition and contents of SOC, with further influence on soil nutrient cycling. Based on recent studies, this review investigated the factors impacting the transformation and distribution of straw-carbon; introduced the microbial composition that contributes to the assimilation of carbon from straw; and summarized the effects of straw-carbon on the composition, content, and turnover of SOC. Additionally, we proposed the future research regarding the effects of abiotic factors on the bio-transformation of straw-carbon; the interaction between biotic and abiotic factors during the straw carbon transformation processes; the coupling of carbon and nitrogen from straws into the soil carbon and nitrogen cycles; and the effective control over the transformation of straw-carbon that enters the active or stable soil organic carbon pool. The purpose was to reveal variation characteristics of SOC during straw returning, and provide theoretical basis and technical support for the efficient fertilization and carbon sequestration of straw returning.

Key words: straw-C distribution, straw return, straw-C conversion, assimilating straw-C microbes, soil organic carbon

YANG Yan-hua, SU Yao, HE Zhen-chao, YU Man, CHEN Xi-jing, SHEN A-lin. Transformation and distribution of straw-derived carbon in soil and the effects on soil organic carbon pool: A review.[J]. Chinese Journal of Applied Ecology, 2019, 30(2): 668-676.

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