首页|Cereal-legume intercropping stimulates straw decomposition and promotes soil organic carbon stability

Cereal-legume intercropping stimulates straw decomposition and promotes soil organic carbon stability

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Cereal-legume intercropping stimulates straw decomposition and promotes soil organic carbon stability
Increasing carbon(C)sequestration and stability in agricultural soils is a key strategy to mitigate climate change towards C neutrality.Crop diversification is an initiative to increase C sequestration in fields,but it is unclear how legume-based crop diversification impacts the functional components of soil organic carbon(SOC)in dryland,including the formation and transformation of particulate organic carbon(POC)and mineral-associated organic carbon(MAOC).We investigated the decomposition of straw residues,the fate of photosynthesized C,as well as the formation of MAOC and POC fractions using an in situ 13C labeling technique in the soybean-wheat intercropping,soybean-maize intercropping and their respective monocropping systems,with and without cover crops.After 4-year treatments,the total SOC content in bulk soil remained unchanged,while MAOC content increased significantly by 5.6％with intercropping.Moreover,the in situ 13C labeling results confirmed that more photosynthesized C was transferred to MAOC,and less was retained in the POC fraction.Intercropping significantly increased total soil N and mineral N content by 15.3％and 13.4％,respectively,and decreased soil and microbial C/N ratio by 11.3％and 17.4％,respectively.This outcome,therefore,relieved microbial N limitation and accelerated straw residue decomposition.Accordingly,the potential of MAOC formation was strengthened for better SOC persistence.Our study suggests that legume-based crop diversification can effectively enrich N and support POC transformation to MAOC,accordingly contributing to the persistent SOC pool and thus potentially achieving C neutrality under climate change in dryland agroecosystems.

crop diversificationSOM decompositionsoil carbon persistencemineral-associated organic carbonparticulate organic carbonintercropping

Wei Wang、Meng-Ying Li、Qing-Hui Wen、Yue Ma、Zhi-Ming Zhang、Muhammad Maqsood Ur Rehman、Fei Mo、Hong-Yan Tao、Bao-Luo Ma、Joann K.Whalen、You-Cai Xiong

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State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems,College of Ecology,Lanzhou University,Lanzhou 730000,China

School of Ecology and Environmental Science,Yunnan University,Kunming 650500,China

College of Agronomy,Northwest A&F University,Yangling 712100,China

Ottawa Research and Development Centre,Agriculture and Agri-Food Canada,Ottawa ONK1AOC6,Canada

Department of Natural Resource Sciences,McGill University,Québec H9X3V9,Canada

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crop diversification SOM decomposition soil carbon persistence mineral-associated organic carbon particulate organic carbon intercropping

2025

10.1007/s11427-024-2683-y

中国科学:生命科学(英文版)
中国科学院

中国科学:生命科学(英文版)

影响因子：0.806
ISSN：1674-7305
年,卷(期)：2025.68(5)