河西走廊盐渍化草地土壤生态指标的选择与分类

THE SOIL CCLOTGICAL INDEXES AND CLASSIFICATION OF SALINE SRASSLAND SOIL IN HIXI CORRIDOR

Principal component analysis (PCA) and Byers discriminant analysis (DA)wereused to atudy the soil characters of saline grassland in Hixi Xorridor. The results showed that the differences in the total soluble salt, structure, organicmatter and poisonous irons in the soils can beidentified with the sbove methods. These suggested that PCA and DA could be used as the soil ecological indexex (SEI). The saline grassland soil was classified into 5 groups according to theirSEI. The environmental features and indicator plants of each group were described.