Organic amendments reshaped the chemical composition of soil organic matter: A meta-analysis

作者：Shihao Ma, Y. e Liang Zhang, Damien Beillouin, J. G. Lu, Tao Ren, Jun Zhu, Yakov Kuzyakov, Xiaokun Li · 发表于：Geoderma · 年份：2026 · DOI：10.1016/j.geoderma.2026.117762 · 被引用次数：5 · 研究领域：Soil Carbon and Nitrogen Dynamics、Marine and coastal ecosystems、Soil and Water Nutrient Dynamics

• Organic amendments increase aromatic carbon by 11% and soil organic carbon content by 52%. • Amendment nitrogen content is a key predictor of aromatic carbon formation. • Cold-wet climates and fertile-acidic soils created the most favorable conditions for accumulating aromatic carbon. • Climate-dependent efficacy of amendments in building soil C pools peaks under cool, wet conditions. Increasing soil organic matter (SOM) content is pivotal for soil health and climate change mitigation, yet the mechanisms governing long-term carbon (C) stabilization via organic amendments remains controversial. We performed a meta -analysis of 540 observations from 45 studies, analyzed by solid-state 13 C NMR spectroscopy, to evaluate the responses of SOM chemical composition and its driving factors to organic amendments. The dataset predominantly comprises cropland soils from Asia, under temperate and subtropical climates, with a focus on major soil types. Functional groups of SOM were associated with climate, soil, and amendment properties, identifying the key factors influencing C stabilization. Organic amendments increased aromatic C by 11%, driving a substantial 52% increase in SOC content compared with mineral-only fertilization. Organic amendment properties and climate factors explained 77% of SOC increase, with nitrogen (N) content identified as key predictors of aromatic groups. The most favorable conditions for aromatic C accumulation included high precipitation (>1000 mm), low tem...