数字农科院2.0

Threshold effects of resistant-layer thickness on gully development in the black soil region of Northeast China

文献类型： 外文期刊

作者： Ma, Lei;Wang, Chunmei;Zhang, Guanghui;La Licata, Manuel;Wen, Yanru;Maerker, Michael;Yang, Qinke;Pang, Guowei;Wang, Enheng

作者机构：

关键词： Black Soil Region;Soil profile;Erosion-resistant layers thickness threshold;Gully sidewall expansion;Gully headcut retreat

期刊名称： SOIL & TILLAGE RESEARCH

ISSN： 0167-1987

年卷期： 2026 年 259 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Gully erosion severely threatens land resources and agricultural sustainability, yet the role of subsurface erosionresistant soil layers remains poorly understood. This study integrated sub-meter imagery with stratified soil sampling (0-120 cm depth) across 79 gullies with comparable slopes gradient and catchment areas on a farm (570 km2) in the black soil region of northeast China to quantify how erosion-resistant layers control gully sidewall expansion and headcut retreat. Ten soil properties were analyzed to construct a PCA-based comprehensive soil erosion resistance score (CRS), revealing a decline in CRS with profile depth and a hierarchy of soil resistance: Black soil > Black soil-Loess transition layer > Loess > Loess-Sand transition layer > Fluvial sandy. The first two layers were identified as erosion-resistant layers. Through threshold effect analysis, a threshold erosion-resistant layer thickness of 53.88 cm was identified (p < 0.01) for sidewall expansion, revealing a 1.36 cm/yr acceleration in gully sidewall expansion per 1 cm thinning within the threshold thickness. Gullies with erosion-resistant layers below the sensitivity thickness experienced 2.03 times higher expansion rate. Gullies newly formed since 2010 exhibited a lower threshold (34.90 cm) than the pre-existing gullies. Gully headcut retreat rate was 43 % higher if the resistant layer was thinner than 54.28 cm, despite no significant detectable threshold. The threshold erosion-resistant layer thickness is potentially modulated by the depth of soil cracks and needs further investigation. This study highlights the importance of soil-profile features, not just surface properties, in gully erosion research. Integration of this threshold into gully erosion models could revolutionize gully prediction and precision conservation strategies.

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