基于主成分聚类法的典型黑土区土壤地球化学分类
刘凯, 戴慧敏, 刘国栋, 宋运红, 梁帅, 杨泽

Geochemical classification of the soil in a typical black soil area using the principal component analysis combined with K-means clustering algorithm
LIU Kai, DAI Hui-Min, LIU Guo-Dong, SONG Yun-Hong, LIANG Shuai, YANG Ze
图4 东北黑土区常量元素含量空间分布(各元素含量区间取值为四分位数,数据单位为%)
Fig.4 Spatial distribution of major elements in black soil area of Northeast China(interval value of element content is quartile and data unit is %)