数字农科院2.0

Conservation tillage could achieve SOC accumulation of eroding farmland in black soil regions

文献类型： 外文期刊

作者： Qian, Rui;Gao, Lei;Hu, Wei;Liu, Junjie;Du, Hao;Peng, Xinhua

作者机构：

关键词： Soil erosion;No-tillage;Straw mulch;Carbon mineralization;Carbon flux

期刊名称： SOIL & TILLAGE RESEARCH

ISSN： 0167-1987

年卷期： 2025 年 258 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Sloping farmland is highly vulnerable to soil organic carbon (SOC) depletion due to severe soil erosion. Conservation tillage has been widely promoted to enhance SOC storage, yet its effectiveness in reducing C loss and improving sequestration in these erosion-prone systems remains unclear. This study quantified SOC budget by assessing major C input and loss pathways under three tillage regimes: conventional tillage with straw removal (CT), conventional tillage with straw incorporation (CTS), and no-tillage with straw mulch (NTS), on a black soil hillslope of Northeast China. Results showed that CT induced a net soil C loss of -1016 kg C ha(-)(1) yr(-)(1). Among all loss pathways, C mineralization was the dominant (>90 %), followed by sediment-associated transport (2.7 %-6.4 %). Relative to CT, CTS increased straw-derived C inputs and reduced sediment-associated losses, resulting in an 87.9 % decrease in net soil C loss. However, due to the substantial increase in C mineralization, it still resulted in net SOC depletion (-122 kg C ha(-)(1) yr(-)(1)). In contrast, NTS most effectively reduced both mineralization and sediment C loss, yielding a net soil C gain of 489 kg C ha(-)(1) yr(-)(1) . These results demonstrate that minimizing soil disturbance and retaining surface residues are essential for reducing C losses and enhancing SOC storage in erosion-prone sloping agroecosystems.

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