The effectiveness of selected vegetation communities in regulating runoff and soil loss from regraded gully banks in the Mollisol region of Northeast China

文献类型： 外文期刊

第一作者： Yan, Yue

作者： Yan, Yue;Zhang, Xingyi;Li, Jianye;Shen, Qingsong;Guo, Mingming;Yan, Yue;Liu, Jielin;Ding, Chao;Qi, Zhi

作者机构：

关键词： black soil; flow hydraulics; gully erosion; revegetation; root mass density

期刊名称：LAND DEGRADATION & DEVELOPMENT （ 影响因子：4.977； 五年影响因子：5.291 ）

ISSN： 1085-3278

年卷期： 2021 年 32 卷 6 期

页码：

收录情况： SCI

摘要： The steep slopes of actively developed gullies are extremely sensitive to erosion in the Mollisol region of Northeast China; however, decision making on the optimal configuration for gully bank protection is under discussion. Here, five vegetation communities were established on regraded gully banks with bare slopes as the control to identify their controlling effects on flow hydraulics and soil erosion through in situ scouring experiments. A hydraulic flume experiment was conducted to clarify the ability of roots to reduce erosion. For vegetated slopes, flow velocity, stream power, and unit stream power decreased by 42-67%, 0-18%, and 44-68%, respectively, while flow depth, shear stress, the Darcy-Weisbach friction coefficient, and Manning coefficient increased by 55-150%, 69-156%, 5-22-times and 2-5-times, respectively. Changes in the seven flow hydraulic parameters were significantly influenced by vegetation coverage, aboveground biomass, root mass density and litter biomass (p < .05). Consequently, the five vegetation communities experienced decreased runoff and soil loss by 19-30% and 78-97%, respectively. Vegetation with tap-roots and rich roots of 1.0-2.0 mm in diameter was more effective in controlling gully bank erosion. Thus, the vegetation community consisting of Dactylis glomerata, Festuca arundinacea, Uraria crinita and Medicago sativa (25:25:25:25) is perfectly acceptable for gully bank protection in the Mollisol region of Northeast China. The results provide a scientific reference for selecting optimal vegetation configuration for gully bank rehabilitation.

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