四川省小流域水土保持措施与土壤侵蚀耦合关系研究

Study on Relationship of Soil and Water Conservation Measures and Soil Erosion of Sub-watersheds in Sichuan Province

为深入评价小流域综合治理和水土保持措施对土壤侵蚀的影响,制定下一步规划方案提供参考资料。利用聚类分析、相关分析等方法对四川省"长治"五期工程涉及的212个小流域水土保持措施和土壤侵蚀状况进行分类并分析其耦合关系,结果表明:水土保持措施聚为4类,以封禁治理、保土耕作措施为主的3类地区有146个小流域,占总量的68.9%。土壤侵蚀聚为4类,以无明显侵蚀、轻度侵蚀为主的4类、一类地区共有158个小流域,占总面积的74.6%。水土保持措施与土壤侵蚀之间的关系为:以封禁治理和保土耕作措施为主的地区无明显流失面积较大,这两种措施防治水土流失效果明显。

Using methods of cluster analysis, correlation analysis, relationship and classification of soil and water conservation measures and soil erosion of sub-watersheds involved by ＇Changzhi five-phase project~ was studied in Sichuan Province. The objective of this research is to provide primal data for assessment of small watershed comprehensive management and effect of water and soil conservation measures on soil ero- sion. Region plan is to be worked out. The results showed that soil and water conservation measures could be divided into four categories, the area of the third types dominated by Grazing Ban and cultivation by conserving soil had 146 sub-watersheds and accounted for 68.9 percent of the total area. Soil erosion could also be divided into four categories, the area of the first and the fourth types dominated by insignificant e- rosion, slight erosion had 158 sub-watersheds and accounted for 74.6 percent of the total area. Relation- ship between soil and water conservation measures and soil erosion was that the area that dominated by Grazing Ban and cultivation by conserving soil were eroded insignificantly or slightly, Grazing Ban and cul- tivation by conserving soil had obvious effect on preventing soil erosion.