中文摘要：

为探讨喀斯特森林植物的重金属含量状况,以茂兰喀斯特森林几种特有种植物为研究对象,分别对其叶片6种重金属元素进行了测定分析.结果表明：含量＞100 mg/kg的元素有Fe和Mn,10～100 mg/kg的元素有Zn和Pb,＜10 mg/kg的元素有Cd和Ni.按鲍恩和埃塞林顿的划分标准,Pb 、Cd 、Fe、Mn 、Zn含量均已达到甚至超过植物中毒水平,植物存在着受重金属毒害的潜在风险,但除Pb外,各重金属含量均处于世界陆生维管植物元素平均含量范围内.Cd、Pb、Mn和Zn为正偏态分布,Fe和Ni为负偏态分布.不同种植物对重金属元素的吸收模式存在一定差异.植物重金属含量的最大值与最小值之比和变异系数均表现为Mn＞Cd＞Pb＞Zn＞Fe＞Ni,反映了植物所处环境中这些元素的地球化学分布特征.

英文摘要：

To investigate the characteristics of heavy metal contents of plant in karst forest, six kinds of elements in the leaves of endemic plants in Maolan Karst forest were measured. The results showed that the contents of Fe and Mn were more than 100 mg/kg, Zn and Pb contents varied between l0 and 100 mg/kg, Cd and Ni contents were lower than 10 mg/kg. According to division standards of Bowen H J M and Etherington J R, the contents of Pb, Cd, Fe, Mn and Zn reached and even more than the poisoning level of plants, plants had the potential risk of heavy metal poisoning. But except for Pb, the heavy metal contents of all elements were within the scope of the average level of land vascular plants in the world. The elements including Cd, Pb, Mn and Zn showed positive skew distribution, while the elements including Fe and Ni showed negative skew distribution. There were differences on the different kinds of plants absorption models of heavy metal elements. The ratio of maximum contents and minimum contents of heavy metal and the coefficients of variation （CV） values both showed Mn〉Cd〉Pb〉Zn〉Fe〉Ni. These reflected the heavy metal geochemical distribution characteristics of the plants in the environment.