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Elevated soil organic carbon content limits microbial carbon use efficiency under manure amendment in Mollisols

文献类型：期刊论文

作者Hou, Guanqun1,2; Hou, Ruixing1,2
刊名APPLIED SOIL ECOLOGY
出版日期2026-04-01
卷号220页码:106869
关键词Carbon sequestration Mollisols Organic amendments Manure applications Microbial carbon use efficiency Nutrient stoichiometry
ISSN号0929-1393
DOI10.1016/j.apsoil.2026.106869
产权排序1
文献子类Article
英文摘要Soil organic carbon (SOC) sequestration under organic amendments is strongly mediated by microbial processes, especially microbial carbon use efficiency (CUE). However, how amendment effects vary with baseline SOC content and microbial carbon-nitrogen (C:N) stoichiometry remains unclear. In the Mollisol zone, Northeast China, long-term SOC decline persists despite widespread manure and straw inputs, suggesting unresolved constraints in microbially driven carbon stabilization. This study examined how SOC content and microbial stoichiometry regulate carbon sequestration responses to manure and straw across six long-term (>5 years) field experiments. In soils with SOC < 18 g kg(-1), manure significantly increased SOC accumulation (by 9.6-26.7%) compared to that of straw, whereas in soils with SOC > 18 g kg(-1), manure reduced SOC (by 9.8-22.3%) and carbon sequestration relative to the unamended control. Manure increased dissolved organic carbon at all sites and alleviated microbial nitrogen limitation, as indicated by the elevated ratios of C:N-acquiring enzyme activity and reduced abundance of nitrogen acquisition genes. This improved microbial CUE in soils with SOC < 18 g kg(-1) (+2.55%). However, in soils with SOC > 18 g kg(-1), characterized by elevated SOC:TN ratios and weaker nitrogen limitation, manure inputs likely increased carbon and nitrogen availability beyond microbial assimilative capacity. This imbalance was consistent with enhanced overflow respiration, as indicated by the increased relative abundance of respiration-related genes and enzymes, resulting in reduced CUE (-2.97%). Thus, SOC-dependent microbial strategies govern the efficiency of organic amendments, emphasizing tailoring residue return practices in enhancing site fertility and microbial nutrient constraints to optimize long-term carbon sequestration.
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WOS关键词ECOENZYMATIC STOICHIOMETRY ; BIOMASS ; MATTER ; COMMUNITIES ; MECHANISMS ; QUANTITY ; QUALITY ; INPUT ; STRAW
WOS研究方向Agriculture
语种英语
WOS记录号WOS:001703975300001
出版者ELSEVIER
源URL[http://ir.igsnrr.ac.cn/handle/311030/221287]  
专题禹城站农业生态系统研究中心_外文论文
通讯作者Hou, Ruixing
作者单位1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Yucheng Comprehens Expt Stn, Beijing 100101, Peoples R China;
推荐引用方式
GB/T 7714		 Hou, Guanqun,Hou, Ruixing. Elevated soil organic carbon content limits microbial carbon use efficiency under manure amendment in Mollisols[J]. APPLIED SOIL ECOLOGY,2026,220:106869.
APA Hou, Guanqun,&Hou, Ruixing.(2026).Elevated soil organic carbon content limits microbial carbon use efficiency under manure amendment in Mollisols.APPLIED SOIL ECOLOGY,220,106869.
MLA Hou, Guanqun,et al."Elevated soil organic carbon content limits microbial carbon use efficiency under manure amendment in Mollisols".APPLIED SOIL ECOLOGY 220(2026):106869.

入库方式： OAI收割

来源：地理科学与资源研究所

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