黔西北红托竹荪种植区土壤重金属含量及污染特征分析

Research on the Content and Pollution Evaluation of Heavy Metals in Dictyophora rubrovalvata Growing Areas of Northwestern Guizhou Province

通过研究贵州省西北部红托竹荪(Dictyophora rubrovalvata M.Zang.Ji.et Liu.)种植区土壤中5种重金属元素的含量,并采用单因子污染指数法和内梅罗综合污染指数法相结合的方法对土壤进行了污染特征评价。结果表明,1号、2号采样点土壤的污染较轻,属于尚清洁;其他采样点污染比较严重,属于中度污染和重度污染。Cd、Cu的单因子污染指数偏高,是重金属污染的主要元素之一;Cd、Cu、Hg、As 4种元素之间的相关性非常显著,因此这4种元素有可能存在相同的重金属污染来源,或者是这4种元素之间存在复合污染。主成分分析结果表明,土壤重金属污染可能主要来自外源性污染。

Five heavy metals in soils cultivating Dictyophora rubrovalvata M.Zang.Ji.et Liu.from Northwestern Guizhou province were investigated and the pollution assessment was made by evaluation method of single pollution index and integrated pollution index（Nemero index）.The results showed that the soils No.1 and No.2 was polluted less at pollution level Ⅱ.The other regions belonged to moderate or heavy pollution level.Cd and Cu were the main elements of heavy metal pollution as the single-factor pollution index was high.The correlation between the four elements（Cd,Cu,Hg,As） was very significant,indicating that these four elements might have the same source of heavy metals contamination or combined pollution.Principal component analysis showed that the main heavy metal pollution might come from outside factors.