主成分分析法在SPSS中的应用——以文峪河河岸带林下草本群落为例

通过主成分分析法,在了解了山西文峪河河岸带林下不同海拔草本群落各个主成分的基础上,根据各个主成分的贡献率计算出各海拔草本的综合得分,按照得分的高低对草本群落进行排名,并对评价结果进行了分析,指出山西文峪河河岸带林综合指标最高的样地在海拔2 160m处,综合指标最低的样地在海拔1 560m处.

The Application of the Principle Components Analysis in SPSS——Taking the Herbage Community under Forest in the Riparian Zone of Wenyuhe River as the Example

By using the principle components analysis,and based on understanding the all components of the f herbage community under forest on different elevations in the riparian zone of Wenyuhe River of Shanxi province,this paper accounts the comprehensive scores of herbage community on different elevations according to the contribution rate of each principle component,and places all herbage communities in order based on their scores,and makes analysis on the evaluation results,and points out that the sample plot wi...