贵州退耕还林以来土壤侵蚀的时空变化及与降水关系

发布时间：2018-12-17 17:40

【摘要】：用变差系数作为衡量其变化幅度大小的指标,运用二元定序变量的Spearman相关分析方法,对贵州省2000年退耕还林以来的河流输沙量、输沙模数和泥沙含量的时空变化与降水量的关系进行了分析。结果表明:贵州省退耕还林以来,河流的输沙量、输沙模数与含沙量均呈减少的趋势,三者的年际变化幅度比较小,但是比其降水量的变化幅度大;从空间差异看,贵州长江流域多年的平均输沙量、输沙模数和河流含沙量比贵州珠江流域的大,而河流输沙量、输沙模数与含沙量的年际变化幅度则比贵州珠江流域的小;贵州的输沙量与降水量的Spearman相关系数为0.897,关系密切,其回归统计方程模型为y=x~(1.223)。
[Abstract]:The variation coefficient is used as the index to measure the magnitude of variation, and the Spearman correlation analysis method of binary sequence variables is used to analyze the river sediment discharge in Guizhou province since the conversion of cultivated land to forestry in 2000. The relationship between temporal and spatial variation of sediment transport modulus and sediment content and precipitation is analyzed. The results show that the sediment transport, modulus and sediment content of rivers have decreased since the conversion of farmland to forest in Guizhou Province. The interannual variation of the three is relatively small, but larger than that of precipitation. In terms of spatial differences, the average sediment transport capacity, sediment transport modulus and river sediment content in the Yangtze River basin in Guizhou are larger than those in the Pearl River basin in Guizhou, while the interannual variation range of river sediment discharge, sediment transport modulus and sediment concentration is smaller than that in Guizhou Pearl River basin. The correlation coefficient of Spearman between sediment transport and precipitation in Guizhou is 0. 897, which is closely related to the regression statistical equation model of YJ x ~ (1.223).
【作者单位】：凯里学院;
【基金】：凯里学院规划课题(s1414);凯里学院地理学校级重点学科课题(KZD2014008) 贵州省科技厅([2014]7237)
【分类号】：S714.7

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