利川土壤-水杉系统中重金属的分布特征

为全面弄清利川市水杉母树管理站水杉幼苗中重金属的富集现状,对利川土壤和水杉中Cd、Cr、Cu、Pb、Zn等5种重金属含量进行了测定分析.结果表明,利川土壤有重金属污染.单污染指数法得出Cd具有轻度污染,其他4种无污染.多因子综合指数法得出整体污染等级为轻污染.水杉中Cd、Cr的次生相富集系数较高,其他3种较低.重金属元素在水杉不同器官中含量具有Zn＞Cr＞Cu＞Pb＞Cd的基本规律.水杉根部各种重金属含量均大于茎叶中的含量.

Distribution Characteristics of Heavy Metals in Soil-Metasequoia System in Lichuan

The Cd, Cr, Cu, Pb and Zn content in the soil and Metasequoia system was detected to know the enrichment condition of heavy metals in Metasequoia seedlings in Lichuan city. The results showed that there was pollution of heavy metals in soils, Cd pollution of soils was light and other 4 heavy metals pollution in soils did not exist by using the single pollution index method, the enrichment coefficient of Cd and Cr with a secondary phase in Metasequoia was high and the enrichment coefficient of Zn, Cu and Pb was lower, the content of heavy metals in different Metasequoia organs was Zn＞Cr＞Cu＞Pb＞Cd, and the content of heavy metals in Metasequoia roots was higher than Metasequoia leaves and stems.