主成分分析法在耕地质量评价中的应用

The application of the principal component analysis method in quality evaluation of cultivated land

本文根据土地资源的特点，对陕北干旱地区旱作耕地土壤的１０个样本７个指标，应用主成分分析法进行了耕地质量评价的探索性研究，分析结果表明，第Ｉ～Ｖ主成分综合携带了全部信息的９４．２６％，各点类聚性强。根据主成分的综合得分划分耕地地力等级，其结果与其它评价的方法实际情况是一致的。此法步骤规范，可以避免信息的交叉和重叠，使分析结果更加清晰和有说服力，且计算简便，又便于计算机处理。主成分分析法对于土地质量评价中土地等级的划分、土地的合理利用和规划具有重要的意义。

According to the features of land resources, the principal component analysis method were used to study 10 samples and 7 indexes of drought soil in the north of Shanxi Province and the quality evaluation of cultivated land was carried out. The result indicated that the I-V principal components generally take 94.26% information of the whole; each point had outstanding characteristic of assembly. In terms of the general score F of the I-V principal components, the result of sorting out the rank of cultivated land was in accordant with the other methods and the practice. The steps of the method was normative and could avoid intercrossing and overlapping the information, and the result of analysis was even clearer and more convincing. Most of all, the method not only calculates simply but also was manipulated easily with computer. In a conclusion, the method had important significance of sorting out the rank of land, land use and land plan.