模糊贴近度-灰色关联法评价菜地土壤重金属污染

Assessment on the Heavy Metals Pollution in Vegetable Soil with Complex Model of Euclid Approach Degree-grey Relational Grade Method

为避免土壤重金属污染评价中单因子剧烈波动对评价结果的影响,运用Euclid贴近度-灰色关联度法对贵州省8个典型农业区菜地土壤中重金属污染情况进行评价。结果表明,供试样本中由于Cd含量偏高,灰关联度法评价的结果达到Ⅱ级水平,而Euclid贴近度-灰色关联度复合法评价结果为Ⅰ级水平,贴近度大小发生变化,结合供试样点重金属含量特征,Euclid贴近度-灰色关联度法评价结果能更合理地反映样本重金属污染水平。

In order to avoid the impacts of the fluctuate value of single heavy metals during the complex pollution assessment, the complex model of Euclid approach degree-grey relational grade method were used to assess the heavy metals pollution in vegetable soil that were collected from eight typical agricultural fields in Guizhou. The results showed that due to the high content of Cd in the testing soils, the evaluated results of grey relational grade method were levelⅡ, while the results of complex model of Euclid approach degree-grey relational grade method were levelⅠ. The values of Euclid approach degree were changed. Combined with the feature of heavy metals content in the testing samples, the results of complex model of Euclid approach degree-grey relational grade method could better reflect the level of heavy metal contamination of samples.