主分量法在艾比湖地区土地沙漠化驱动机制上的应用

[目的]分析艾比湖沙漠化自然和人文影响因子,确立该地区沙漠化定量指标.[方法]根据此定量指标利用主分量方法对艾比湖地区沙漠化驱动因子进行分析.[结果]第一主成分的方差贡献率为69.21;, 其中,自然因子中蒸发、大风日数、年均温的负荷量高于人为因子,但差距不大,表明流域沙漠化过程是在气候变化的作用下与人为活动中共同影响下发生的;第二主成分的贡献率为25.37;,人为因子中牲畜数量、城镇化率、人均GDP 明显高于气候因子,表明在流域气候向暖湿方向变化时,人为活动却继续影响着沙漠化的过程,并且作用较大.[结论]根据研究区沙漠化现状,结合定性分析结果及艾比湖地区特点,提出今后沙漠化防治对策及建议.

The Application of Principal Component Analysis on the Driving Mechanism of Desertification in Ebinur Lake Region

【Objective】To analyze the nature factors and human impact factors contributed to the desertification of Ebinur Lake,the paper aimed to establish quantitative indexes of desertification.【Method】The principal component analysis was used to research the driving factors for desertification in Ebinur Lake based on the quantitative indexes.【Result】The result revealed that:the contribution rate of the first principal component is 69.21%.In natural factors,the carrying capacity of evaporation,the days of strong winds and an average annual temperature are higher than artificial factors,but the gap is not large,showing that the desertification process is influenced by the context of climate change and human activities;the second principal component of the contribution rate is 25.37%,and among the human factors the number of livestock,urbanization and per capita GDP are higher than climate factors,showing that through the process of climate change to warm and wet,human activities,the leading factors,still affect the process of desertification.【Conclusion】Finally,based on the studies and the characteristic of desertification in Ebinur Lake area,the paper gives some advices against desertification.