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Optimal nitrogen fertilizer management increased soil organic carbon density by increasing particulate organic matter proportion and plant-derived carbon in topsoil

文献类型： 外文期刊

作者： Wang, Xingbang 1 ; Gao, Xiaopeng 4 ; Zhang, Ling 5 ; Zhao, Fulin 1 ; Chen, Ji 6 ; Zhang, Wushuai 1 ; Chen, Xinping 1 ;

作者机构： 1.Southwest Univ, Coll Resources & Environm, Chongqing 400715, Peoples R China

2.Southwest Univ, Acad Agr Sci, Chongqing 400715, Peoples R China

3.Southwest Univ, Interdisciplinary Res Ctr Agr Green Dev Yangtze Ri, Chongqing 400715, Peoples R China

4.Univ Manitoba, Dept Soil Sci, Winnipeg, MB R3T2N2, Canada

5.Beijing Acad Agr & Forestry Sci, Inst Plant Nutr Resources & Environm, Beijing 100097, Peoples R China

6.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China

关键词： N fertilization management; Particulate organic matter; Mineral-associated organic matter; Plant-derived carbon; Microbial-derived carbon

期刊名称：SOIL & TILLAGE RESEARCH （ 影响因子：6.8； 五年影响因子：7.8 ）

ISSN： 0167-1987

年卷期： 2025 年 254 卷

页码：

收录情况： SCI

摘要： The fractions and sources of soil organic carbon (SOC) influence its composition, accumulation, stability, and turnover rate. However, the effects of fertilizer nitrogen (N) management on SOC fractions across soil profile remain poorly understood. This 15-year wheat-maize rotation study investigated the effects of optimal (Opt.N) and conventional (Con.N) N fertilization rates on SOC density, sources, and fractions. Opt.N was optimized N fertilizer rate based on the in-season root zone N management strategy, and Con.N was the farmer' conventional N management. Compared to unfertilized control, N fertilization significantly increased SOC density in topsoil. Specifically, Opt.N significantly increased particulate organic matter (POM) in the topsoil by 10.8 %, and also exhibited the highest lignin phenols content (124.6 mu g g-1). Additionally, N fertilization significantly increased amino sugars content for all SOC fractions in topsoil and for POM fraction in subsoil. Opt.N promoted plant-derived carbon accumulation while maintaining a balanced microbial-derived carbon, whereas Con.N favored bacterial necromass dominance in topsoil. N fertilization decreased the microbial-to plant-derived carbon ratio (M:P) by 30.0-58.6 % in both the topsoil and the subsoil, which had a linear negative correlation with the M:P ratio in the topsoil, suggesting plant-derived carbon was the dominant contributor to SOC density. In the subsoil, microbial-derived carbon contributed more to SOC due to reduced plant carbon input. In conclusion, our study deepened understanding of SOC fractions and sources in both topsoil and subsoil under long-term N fertilization, and highlighted the critical role of plant-derived carbon on SOC sequestration in agro-ecosystems.

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