凉山烟区土壤肥力的综合评价

摘要

The principal component analysis in the SPSS statistical software was adopted to conduct a comprehensive evaluation of soil fertility according to 9 fertility indicators of 5 soil types in Liangshan tobacco growing areas. The cumulative contribution rate of three main components was 86.96%. The original indicators information could be explained basically by these three main components. The three main components were; ① soil organic matter, organic total carbon, total nitrogen, total phosphorus, available nitrogen, available phosphorus content; ② total potassium and available potassium content; ③pH —value. The integrated fertility score of various soil types showed the following order; yellow soil > purple soil > red soil > paddy soil > yellow brown soil.%根据凉山烟区5种类型土壤的9种肥力指标数据,应用主成分分析法对该区的土壤肥力进行了综合评价,得出的3个主成分的累积贡献率为86.96％.3个主成分为养分因子(由有机质、有机总碳、全氮、全磷、碱解氮、速效磷含量组成)、钾因子(由全钾和速效钾含量组成)和pH因子(由pH值组成).不同类型土壤肥力的综合得分显示为:黄壤＞紫色土＞红壤＞水稻土＞黄棕壤.