陕西省土壤的数值区划

Principal component and fuzzy cluster analysis on chemical characters of agricultural soil

本文通过对陕西省54个土壤样本的12个农化特性作主成份分析,揭示了陕西省土壤南北差异明显,主要是由碱解氮、有机质、全氮、铜、铁和锰的变异引起;东西差异由北向南逐渐增大,主要是由硼、速效磷和速效钾的变异造成。在主成份聚类的基础上,把54个土样分为黄土高原丘陵沟壑、渭北旱塬和关中平原三大地貌分区;用模糊聚类法划分为16个分区,结果与实际土壤分布相符。

Through principal component analysis to tweleve kinds of agri-chemical characters of soil samples of 54 counties,Shaanxi province, the result shows,the variance of soil of the province in north-south is the largest,it was caused by the variance of hydrolyzable N,organic mailer,total N,Cu,Fe,and Mn;the variance in west-east is gradually increase along nor Lh-south,it was caused by the variance of B,available P and available K.54 soil samples was clustered by principal component to three regions:Loess plateau gully hill region,Weibei rainfed highland and Ouanzhong plain,and was classified by fuzzy cluster to sixteen types,result of the latter is more according with the actual condition.