《Table 7 Regression analysis for soil nutrients using different factors as independent variables (n=

《Table 7 Regression analysis for soil nutrients using different factors as independent variables (n=   提示:宽带有限、当前游客访问压缩模式
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《"Spatial variability of soil total nitrogen,phosphorus and potassium in Renshou County of Sichuan Basin,China"》


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1) TN,total nitrogen;TP,total phosphorus;TK,total potassium.

Descriptive statistical parameters of the soil nutrients are shown in Table 1.The average contents of TN,TP and TK were 1.12,0.82 and 9.64 g kg–1,respectively.According to the classification criteria of soil nutrients developed during the period of the China National Soil Survey in the 1980s,soil nutrients in this study area were each at mid-range levels.In China,the mean contents of TN,TP and TK were1.54,0.74 and 18.60 g kg–1,respectively(Zhang et al.2005;Shangguan et al.2013).This indicated the study area had relatively higher levels of TP while contents of other two soil nutrients were much lower compared with their national levels.The coefficients of variation(CV)of the soil nutrients,as indices of the overall variation of heterogeneity,ranged from 30.56 to 38.75%.According to the classification standards proposed by Nielsen and Bouma(1985),all the soil nutrients had moderate variability.