• 论文 •

主成分分析在农田土壤环境评价中的应用

1. 1. 中国环境科学研究院生态所,北京100012;
2. 清华大学环境科学与工程系,北京100012;
3. 中国环境科学研究院生态所,北京100084
• 收稿日期:2005-10-07 修回日期:2006-03-06 出版日期:2006-10-15 发布日期:2006-10-15
• 作者简介:高吉喜(1964-),男,内蒙古呼和浩特人,研究员,博士。主要从事区域生态学、可持续发展等领域 的研究。E-mail:gaojx@craes.org.cn。
• 基金资助:

国家环保总局“中意合作典型区生态环境调查”项目

The application of principal component analysis to agriculture soil contamination assessment

GAO Ji-xi1, DUAN Fei-zhou2, XIANG Bao1

1. 1. Institute of Ecology,CRAES,Beijing 100012,China
;
2. Department of Environment Science and Engineering,Tsinghua University,Beijing 100084,China
• Received:2005-10-07 Revised:2006-03-06 Online:2006-10-15 Published:2006-10-15

Abstract:

Principal components analysis(PCA) is a statistical technique used to investigate the structure of a data set,in an effort to identify the procedures controlling the scores of the variables in the data.PCA produces several linear combinations of observed variables,each linear combination being a component or factor.The factors summarize the patterns of the correlations in the observed correlation matrix and can in fact be used to reproduce the observed correlation matrix.Since the number of factors is usually far fewer than the number of the observed variables,there is a considerable parsimony in factor analysis.Furthermore,when scores on factors are estimated for each subject,they are often more reliable than scores on individual observed variables.The advantages of PCA are particularly useful in soil complex contamination studies,especially in poorly recorded areas historically,and could be further used for the spatial assessment.Now PCA has been used in the fields of resource exploitation and protection,environmental degradation and quantitative soil contamination assessment. In this paper,data structure of soil contaminations,relationships and differences of soil pollutions were discovered,and the major components of soil pollutions were identified.The result of agriculture field quality classified with component scores showed that paddy field irrigated with clean water was on the top of the six types of land,and soil environment of sewage irrigated paddy field had worst quality.The relationships with and contribution to contamination of soil pollutants were reflected well.The effect of heavy metals inputting was higher than organic pesticide,and is the major factor of soil contamination. The study implied that PCA is advantageous in the assessment on complex soil contamination and classification of soil environmental quality,and could be used in soil pollutants identify ication and soil environment assessment as well. The method could simplify the process of major soil pollutants identification,especially in cases of complex or poorly recorded contamination.