关键词: 物元模型, 偏相关分析, 青海, 土壤养分评价

Abstract: Soil organic matter,total nitrogen,total phosphorus,total potassium,available nitrogen,available phosphorus,available potassium were chosen as the evaluation indexes,and the soil nutrients data obtained by means of field investigation,sampling and laboratory analysis.Based on the data,the forest soil nutrients evaluation for 72 samples in Qinghai province was carried out by building the model combined with partial correlation method and element-matter analysis.The results indicated that the situation of the forest soil nutrients in Qinghai province was in good condition,and the level distribution mainly concentrated above 3^rd level.In addition,the available phosphorus content was so poor among the seven indexes,the contents of other indexes were all abundant.The situation of soil nutrients in Xining and Haixi was the best and the worst respectively,and other districts were better.The lower level of organic matter and nitrogen led to worst soil nutrient condition in Haixi,which manifested what the organic matter and nitrogen were the mainly influencing factors for the whole soil nutrients.

Key words: element-matter analysis, partial correlation, Qinghai, soil nutrients evaluation