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选定南水北调中线工程水源地丹江口水库区这一国家水土流失重点治理区域为研究地点,对该地的土壤可蚀性特征进行了研究。在研究区不同土地覆盖类型里采取表层(20cm)土壤样品,室内分析样品土壤的质地和有机质含量,利用EPIC模型及实验室分析的土壤质地和有机质数据计算样品土壤可蚀性K值。在ARCGIS里,利用Ordinary Kriging插值方法生成研究区K值分布图。然后按一定标准将K值进行分级,得出不同K等级值的空间分布及面积。结果表明:研究区K的均值为0.034 8(t·hm2·h)/(hm2·MJ·mm),主要为中可蚀性土壤(面积占91.71%)。东部(主要是耕地)土壤K值高于西部(主要是林地),是侵蚀治理的重点地区。研究结果可为库区水土流失定量遥感监测提供基础资料,对库区的土壤侵蚀治理有一定的参考作用。
The selected national key project area for soil and water loss in Danjiangkou Reservoir, a water source for the mid-route of South-North Water Diversion Project, was selected as the research site and the soil erodibility characteristics of the project were studied. The surface soil (20cm) samples were taken from different land cover types in the study area to analyze the soil texture and organic matter content in the sample. The soil erodibility value K was calculated by using the soil texture and organic matter data analyzed by EPIC model and laboratory. In ARCGIS, Ordinary Kriging interpolation method was used to generate the K-value distribution in the study area. Then according to a certain standard K value will be graded to get the spatial distribution and area of different K grade value. The results show that the average value of K in the study area is 0.034 8 (t · hm2 · h) / (hm2 · MJ · mm), mainly in medium erodable soil (91.71% of the area). The K value of the soil in the east (mainly cultivated land) is higher than that in the west (mainly woodland) and is the key area for erosion control. The results can provide basic information for quantitative remote sensing monitoring of water and soil loss in the reservoir area, and have some reference to soil erosion control in the reservoir area.