【摘要】 土壤粒径分布影响土壤的水力侵蚀特性,是重要的土壤物理特性之一。以黄土丘陵沟壑区山西吉县蔡家川嵌套流域为研究对象,探究其流域面积、森林覆盖率和流域高程对下游各堰周边淤积泥沙粒径分布的影响。结果表明:流域面积越大,淤积泥沙粒径越小且淤积粒径小于1 mm;植被覆盖度对下游各堰周边淤积土壤没有趋势性的筛选作用,流域所处海拔高度对淤积泥沙粒径影响不大;粒径大于5 mm的影响因素从高到底分别为:森林覆盖率>农地比例>河流比降>流域面积,粒径小于5 mm的影响因素从高到底分别为:流域面积>森林覆盖率>农地比例>河流比降。研究结果可为黄土高原黄土丘陵沟壑区水土流失治理提供科学依据。更多还原

【Abstract】 The distribution of soil particle size is one of the important soil physical properties, which affects the hydraulic characteristics and soil erosion. Taking the Caijiachuan nested watershed in the loess hilly and gully region as the research object, this study explores the effects of watershed area, forest coverage, and watershed elevation on the distribution of sediment particle size in front of the downstream weirs. The results show that the larger the watershed area, the smaller the sediment particle size and the size D<1 mm; The vegetation coverage has no trend screening effect on the sediment in front of the, and the altitude of the watershed has little effect; The influencing factors for sediment with particle size D>5 mm, from high to low are: forest coverage>proportion of farmland>river slope>watershed area. The influencing factors for sediment with particle size D<5 mm, from high to low are: watershed area>forest coverage>proportion of farmland>river slope. The research results can provide scientific basis for soil erosion control in the loess hilly and gully areas of the Loess Plateau.更多还原