基于因子分析法的汝溪河流域不同植被类型土壤肥力评价

运用因子分析法评价了长江汝溪河流域不同植被类型的土壤肥力,通过计算和分析特征根、累计贡献率、因子载荷矩阵、各土层主成分因子及其综合得分,得出汝溪河流域不同植被类型土壤肥力丰缺状况、变化规律及其影响因素,进而找到改善和提高土壤肥力的方法和途径。分析表明:pH值和主要养分指标随着土层深度的加深而逐渐下降,各植被类型在不同土层的养分含量具有较大差异,土壤养分管理需要综合考虑不同因子的主成分得分与综合得分情况,该分析结果可对该区域内森林抚育、水土流失防治、土壤可持续利用等提供参考依据。

Evaluation of Soil Fertility of Different Vegetation Types in Ruxi River Valley Based on Factor Analysis

The factor analysis was used to evaluate the soil fertility of different vegetation types in the Ruxi river valley. The characteristic root, accumulative contribution rate, factor loading matrix, and principal - component scores were calculated and ana- lyzed, and the status, change law and influencing factors of soil fertility of different vegetation types were obtained, which would help to find the,direction and way to improve soil fertility. The analysis showed that soil pH - value and main nutrient contents re- duced gradually from the upper layer to the lower layer of soil. Meanwhile, there was great difference in soil fertility among different vegetation types. The scores of various principal components and the comprehensive score of soil fertility should be comprehensively considered in soil nutrient management. These results could provide reference for the further forest tending, soil erosion control, soil sustainable utilization and so on in the Ruxi river valley.