数字农科院2.0

Organic amendments alleviate SOC loss from erosion-prone sloping farmland by enhancing physical protection and chemical stabilization

文献类型： 外文期刊

作者： Yu Liu; Bing Liu; Zhuo Hao; Qingwen Zhang*; Li Zheng; Xinyuan Wei; Longsheng Shangguan; Yulong Shi; Xiaoying Zhan; Dong Wang

关键词： Organic amendments; Sloping farmland; Water erosion; Soil organic carbon; Organic carbon fractionation; Humification

期刊名称： ENVIRONMENTAL RESEARCH

ISSN： 0013-9351

年卷期： 2026 年

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Organic amendments (OA) enhance soil organic carbon (SOC) stocks and mitigate erosion in sloping farmlands under intense urban-agricultural pressure. However, the mechanisms underlying OA-regulated SOC redistribution and stabilization remain unclear. This study investigated the key regulatory role of OA in modulating SOC fractions and dissolved organic matter (DOM) humification in southwest China's sloping farmlands using a longterm field experiment with three treatments: chemical fertilizer only (CK), organic fertilizer (OF), and organic fertilizer combined with straw returning (OFSW). Results showed that erosion caused spatial heterogeneity in SOC fractions, with particulate organic carbon (POC) loss on upper slopes and mineral-associated organic carbon (MAOC) accumulation downslope. OA application significantly increased SOC and aggregate stability under both OF and OFSW. Specifically, POC on the upper slope under OA treatments was over 3.7 times higher than CK, while the downslope increased by 0.7–1.4 times. OF preferentially enhanced DOM humification and MAOC preservation, while OFSW more effectively retained SOC on upper slopes and increased labile POC downslope. PARAFAC modeling identified humic-like DOM enrichment linked to SOC stabilization. Partial least squares path modeling revealed OA's synergistic regulation of SOC through physical protection and chemical stabilization pathways. These findings highlight tailored OA strategies as effective for mitigating erosion-induced SOC loss and enhancing carbon sequestration in sloping agroecosystems.

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