基于作物产量指标和聚类分析的立地分类比较研究(英文)

对棉地评价中基于作物产量指标和对土地属性作聚类分析的立地分类进行比较研究。结果表明，从作物产量指标分析中可得出三个等级：适宜级Ⅰ（产量>900kg/hm2），适宜级Ⅱ（产量500-900kg/hm2），适宜级Ⅲ（产量<500kg/hm2）。而聚类分析中通过对86个样本进行统计计算也得出三个等级。两种分类方法的基本结论没有太大分歧，但通过聚类分析得出的立地分类与基于作物产量指标的立地分类并不完全一致。研究结果也清楚地表明，经过适当的修正，作物产量指标分析法可以被可靠地运用于棉地评价的立地分类中。

Comparative analysis of site classification based on crop yield index and cluster analysis

A comparative analysis of site classification based on crop yieldindex and cluster analysis is presented. The yield index revealed three Clusters, Suitability Class 1 (SC1) >900 kg/hm2], Suitability Class 2 (SC2) 500-900 kg/hm2], and Suitability Class 3 (SC3) <500 kg/hm2]. Cluster analysis revealed three classes at absolute delineation distance of about 86 units. The basic structure of the sites was not seriously violated as sites were grouped in satisfactory classes based on the attributes. Although, assignment of sites by Cluster Analysis did not wholly agree with that based on yield index, it is clear from the results that the crop yield index complemented with an appropriate attribute summarization technique could reliably be used in classifying sites in production systems.