数字农科院2.0

Preceding intercropped leguminous green manure shifts microbial life strategies to regulate soil organic carbon in low-nitrogen input maize-rapeseed rotations

文献类型： 外文期刊

作者： Lu Yang;Jiaqiao Luo;Chiming Gu;Wei Huang;Jing Dai;Pan Liao;Haibin Chang;Xiaofen Yao;Yuan Gao;Wenshi Hu;Yinshui Li;Lu Qin

作者机构：

关键词： Green manure;Intercropping;Legacy effect;Microbial life strategy;Soil organic carbon

期刊名称： Soil and Tillage Research

ISSN： 0167-1987

年卷期： 2025 年 256 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Cropping diversification, especially with legume inclusion, has been shown to improve soil organic carbon (SOC) sequestration. However, it remains unexplored how preceding intercropped leguminous green manure affect microbial activity and necromass C contribution to SOC under reduced nitrogen (N) input in subsequent crop rotations. A six-year field experiment was conducted with treatments including maize monoculture (M) and intercropping with lablab bean as green manure (M/L), followed by rapeseed (R) under zero, 100 % and 65 % of recommended N application. The treatments were designated as M-R0, M-R100, M-R65, and M/L-R65. Soils were collected from 0 to 20 cm topsoil and 20–40 cm subsoil after rapeseed harvest for analysis of SOC fractions, microbial necromass carbon (MNC), extracellular enzyme activities, and microbial community. The results showed that preceding maize/legume intercropping M/L-R65 significantly increased the content of SOC, total N, dissolved organic C and N by 14.3–34.1 % in the topsoil compared to M-R100. This increase was associated with higher microbial necromass C content driven by a shift towards K-strategy microorganisms that produce more recalcitrant necromass compounds. In contrast, subsoil SOC levels remained relatively stable in the M/L-R65, despite an increase in MNC content. The lower soil C/N and dissolved organic C/N ratios in the M/L-R65 treatment endorsed soil N enrichment-induced decomposition of particulate organic C (POC) in the subsoil. This was further corroborated by the strong and direct impacts of soil C to N stoichiometry on microbial C pools revealed by PLS-PM analysis. Microbial C use efficiency (CUE) was higher in reduced N input treatments in the subsoil, but this did not translate to increased SOC in the subsoil layer, likely due to the shift in fungal community towards r-strategists. Overall, the study suggests that preceding legume intercropping enhances SOC sequestration in the topsoil of low-N input rapeseed rotation systems through increased microbial necromass C inputs. Moreover, the responses of SOC pools across soil depths are mediated by shifts in microbial life-history strategies.

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