基于主成分分析与层次分析的三峡库区耕地集约利用对比

以三峡库区耕地集约利用研究为例，紧扣土地集约利用的涵义，构建三峡库区耕地集约利用评价的指标体系，采用不同的方法评价库区耕地集约利用程度并进行对比分析，寻找对集约利用值影响的差异；采用主成分分析法和层次分析的方法，并结合对比分析法；研究表明两种方法对耕地集约利用值影响的顺序差相差不大，并且在集约利用程度分布上吻合较好，主成分分析法中每组主成分贡献率的作用趋势与层次分析法中对应的准则层权重大小基本一致。另外要提高耕地的集约利用水平重在提高耕地的产出。开展此项研究一方面提高了库区耕地集约利用评价的准确度，另一方面得出了提高库区耕地集约度的途径。

Comparative on regional cultivated land intensive use based on principal component analysis and analytic hierarchy process inThree Gorges Reservoir Area

In order to construct indicator system of the cultivated land intensive use appraisal and compare two appraisal methods to find the difference of intensive use scores, this paper takes cultivated land intensive use in Three Gorges Reservoir Area as researching object, and connects closely the concept of land intensive use. Principal component analysis (PCA) and analytic hierarchy process (AHP) were used to calculate the intensive use scores in 21 counties according to the same appraisal indicator system. In the same time, the appraisal results were compared and the results showed that difference of appraisal results order was small. The intensive use scores were divided into four grades, the spatial difference of grades were implemented by the ARCGIS 9.2. The distributions of intensive use scores took on evident consistency. Impact trend of contribution by PCA was similar to weight trend of code layer by AHP. Above all, on one hand, this paper can improve the accuracy of intensive use appraisal, on the other hand, give some advices to enhance intensive use degree of cultivated land in Three Gorges Reservoir Area.