基于主成分分析法的土壤蒸发能力影响因子研究

Research on the Factors Influencing Soil Evaporation Ability Based on Principal Component Analysis

[目的]为沙地土壤蒸发的研究提供参考。[方法]采用主成分分析法,分析与沙地土壤蒸发能力有关的18个影响因子系列的主成分,研究土壤蒸发能力的影响因子。[结果]通过特征值和特征向量的删减和剩余变量的舍弃分析,最终确定的主成分是由11个因变量共同构成的综合向量,它们所对应的载荷都达到了75%以上,并将沙地土壤蒸发能力的影响因子分为3类:温度因素、湿度因素、风速因素。在众多影响因子中,距地面高2.0m处的风速和相对湿度突出,它们所对应的因子累计载荷值分别是94.3%、94.2%。[结论]距离地面高2.0 m处的气象因子对土壤蒸发能力的影响最为显著。

[Objective] The purpose was to supply reference for researching the soil evaporation of sand land, [Method] The principle components of 18 influencing factor series related to the soil evaporation ability of sand land were analyzed by principle component analysis so as to research the factors influencing soil evaporation ability. [Result] Through the deletion of eigenvalue and eigenvector and discarding analysis of surplus variable, the principle component was ascertained as an integrated eigenvector together consisted of 11 dependent variables finally and their corresponding loads were higher than 75%. The factors influencing soil evaporation ability of sand land were classified into 3 categories i.e. temperature, humidity and wind velocity factors. Among many influencing factors, the wind velocity and relative humidity at the height of 2.0 m from ground were outstanding and the cumulative load values of their corresponding factors were 94.3% and 94.2% resp. [Conclusion] The influences of meteorological factors at the height of 2.0 m from ground on the soil evaporation ability were most significant.