不同植被类型对地表径流影响的灰色关联度分析

影响地表径流的因素有气候、地质、植被等诸多因子,植被因素的影响甚为突出。以重庆缙云山4个不同植被类型小区为研究对象,采用灰色关联度的方法,对影响因子进行了对比分析。分析了降雨状况参数和植被状况参数对地表径流的影响,结果发现降雨量与径流的关联度最大,影响参数中影响程度顺序为:乔木覆盖度>林分高度>枯落物的厚度>坡度>林下木的覆盖度>土壤厚度;在对小区植被类型之间的灰色关联度差异分析中,发现混交林与径流的关联度最大,其次为阔叶林、楠竹林,最小为农地。

Grey Rational Degree Analyses for Effects of Different Vegetation Types on Overland Flow

There are many different factors affecting overland flow,such as climate,geology and vegetation,among which vegetation type is a key factor.In this study,four different vegetation types in Jinyun Mountain,Chongqing City,were investigated using the grey rational degree.The analyses of precipitation and vegetation effects on overland flow indicate the highest rational degree of precipitation with surface runoff.The parameters contribute to overland flow in the descending order of canopy density,standing forest height,litter thickness,slope degree,coverage and soil thickness.The rational degrees of different vegetation types descend in the order of mixed wood,broadleaved forestry,bamboo forestry and cropland.