Evaluation of Soil Fertility in Dry-hot Valley of Jinsha River
Using principal component analysis of four vegetation recovery modes in the dry-hot valley,eight comprehensive soil fertility evaluation indicators were studied.Three principal components of cumulative contribution rate of 87.763% to reflect the original target information were found.The 3 principal components were ①total phosphorus,total potassium,available potassium,soil organic matter,total nitrogen;②hydrolysable nitrogen;③available phosphorus.The results showed the IFI score was in the following order: sunny slope woodland orchard woodlandtamarind forestshady woodland.