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利用两步聚类、相关分析等方法,对四川省“长治”工程涉及的212条小流域土地利用和土壤侵蚀状况进行分类并分析其耦合关系,结果表明:土地利用聚为四类,以坡耕地、梯田和经果林为主的三类、四类流域条数占流域总条数的59.9%;土壤侵蚀聚为四类,以无明显侵蚀、轻度侵蚀为主的四类、一类流域条数占流域总条数的74.6%。土地利用与土壤侵蚀之间的关系为:以林地和难利用地为主的流域侵蚀程度最轻,强烈及强烈以上的侵蚀主要发生在以坡耕地为主的流域内。
Based on two-step clustering and correlation analysis, the land use and soil erosion of 212 small watersheds in Sichuan Province were classified and their coupling relations were analyzed. The results showed that land use was clustered into four types, There are three types of basins, which are mainly arable land, terraced fields and peristome forests. The number of the four types of watersheds accounts for 59.9% of the total number of the watersheds. There are four types of soil erosion, of which four types are mainly no obvious erosion and slight erosion The number of such watersheds accounts for 74.6% of the total number of watersheds. The relationship between land use and soil erosion is as follows: the erosion in the watersheds dominated by forest land and hard-to-use land is the lightest, and intense and intense erosion mainly occurs in watersheds dominated by sloping fields.