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| Factor analysis in environmental degradation at the lower reaches of Tarim river |
| Sun Yongqiang, Wang Dezhong, Yin Linke, Xu Hailiang |
| Xinjiang Institute of Ecology and Geography, Chinese Academic of Science, Urumqi, 830011, Urumqi, China |
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Abstract The environmental degraded degree of 39 monitoring sites built along the Tarim river in the lower reaches were analyzed by using the factor analysis method, which is provided by the software of Statistical Package for the Social Science(SPSS). Through mathematic transform, the 8 observed indexes are transformed into 3 synthetic indexes. According to the fact and data invested in this area, environmental context of these synthetic indexes was given. Based on the contribution rate, the factor scores of the 39 sites are calculated, and the desertification degree is classified by its factor scores. Viewing from the consequence, the more distant from the Daxihaizi Reservoir the worse the desertification degree in the lower reaches of Tarim river. Analysis results showed that the vegetation is deteriorated with the water deficit and salt accumulated. Due to the result is suit for the fact, the method is accurate, scientific and practical for reason that it synthesizes the affect of every index.
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Received: 12 July 2004
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