摘要
通过大量典型样地调查数据，采用主成分分析法筛选出5个评价指标，用灰色关联基本理论建立退化指数模型，对贵阳市白云岩区土地退化进行初步评价，按照退化指数值将其土地退化程度分为4个等级，分别是轻度（O-0．20）、中度（0．20～0．4JD）、强度（O．4-0．65）和极强度（≥0．65）；59个评价单元有12个属于中度等级，47个属于强度等级，无轻度和极强度等级出现。评价显示，土地退化程度与地表植被有较好的相关性，贵阳市6个区（县）退化程度一致，具有典型的水蚀淋溶型侵蚀特征。
Through a lot of plots data, using principal component analysis to select 5 evaluation index,this paper established a degraded index model based on the grey association analysis and made a preliminary evaluation to the land deg- radation of dolomite region in Guiyang city. According to the degradation index, 4 degrees of land degradation were divided, they were slight （0- 0.20）, middle （0.20 - 0.40 ）, strong （ 0.40 - 0.65 ） and strongest （≥ 0.65 ）, the 59 evaluation units had 12 of middle degree,47 strong, but no slight and strongest degrees. The evaluation results showed that the land degradation had a good correlation with the land vegetation, 6 counties in Guiyang city had the same degra-dation degree and was characterized with a typical water erosion.
出处
《山地农业生物学报》
2007年第5期386-391,共6页
Journal of Mountain Agriculture and Biology
基金
贵州省"十五"攻关项目资助(黔科合2004NGY063)
关键词
白云岩
土地退化
灰色系统
灰色关联度
贵阳
dolomite
land degradation
grey system
degree of grey relation
Guiyang
