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Morphology and controlling factors of step-pools in rills based on field investigation in the Yuanmou Dry-hot Valley, China

文献类型： 外文期刊

作者： Yang, Haiqing 1 ; Zhang, Bin 2 ; Liu, Hui 2 ; Deng, Qingchun 2 ; Fang, Haidong 3 ;

作者机构： 1.East China Normal Univ, Sch Geog Sci, Shanghai, Peoples R China

2.China West Normal Univ, Sch Land & Resources, Nanchong, Peoples R China

3.Yunnan Acad Agr Sci, Trop Ecoagr Inst, Kunming, Yunnan Sheng, Peoples R China

关键词： Step-pool; morphological characteristics; rills; Dry-hot Valley

期刊名称：PHYSICAL GEOGRAPHY （ 影响因子：2.086； 五年影响因子：1.959 ）

ISSN： 0272-3646

年卷期： 2019 年 40 卷 3 期

页码：

收录情况： SCI

摘要： Rill erosion is well developed in Yuanmou Dry-hot Valley. The appearance of step-pools in rills (SPRs) is an early stage of erosion and necessary condition for rill development. We measured length, width, depth of plunge pools, and length, height, and slope of step walls. We observed the developmental environment of every SPR in the field. Through research on relationships among SPR parameters, morphological characteristics, and control factors, we conclude that (1) correlations of step slope with pool length and width, and of step length with pool width are not evident (p > 0.1); correlations of pool length with step height and length are evident (p < 0.1); correlations of step slope with pool depth, and of step height with pool width are significant (p < 0.05); and correlations of pool depth with step length and height are highly significant (p < 0.01). Plunge-pool length is affected by soil properties and step height, but not by step gradient. (2) SPR formation shows a coupling effect of a single factor or many factors, such as terrain conditions, vegetation, confluence area, soil properties, and boundary conditions, and the shapes and scales of SPRs notably change with differences of the main control factors.

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