主成分分析法在土壤腐蚀性评价中的应用

The Application of Principle Component Analysis (PCA) Method in Evaluation of Soil Corrosivity

介绍了主成分分析法的基本方法,以及该方法在评价土壤腐蚀性中的应用。根据这一方法,建立了土壤腐蚀性综合因素评价的数学模型,并得到土壤电阻率、含水量、自然电位、pH值和土壤质地等五项土壤腐蚀指标的权重,据此来判定土壤的腐蚀性等级。通过在重庆和合江两地的现场试验表明,应用主成分分析法得到的土壤腐蚀结果与现场埋片试验结果相当吻合,表明主成分分析法在土壤腐蚀研究方面的应用是成功的。

The basic method of Principle Component Analysis (PCA) methodology and its application in evaluation of soil corrosivity are introduced. On the basis of this methodology, the authors build up a mathematical model about comprehensive factors evaluation of soil corrosivity,and obtain the index weight for soil resistivity, water cut, natural potential, pH value and soil composition, which can be used to determine the classification of soil corrosivity. The field tests in Chongqing and Hejiang display that the result of soil corrosivity obtained from the Principle Component Analysis (PCA) methodology is quite fitted with that of site coupon. It is concluded that the Principle Component Analysis (PCA) methodology is feasible and effective in soil corrosivity assessment.