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为探讨自然保护区森林生态系统植物重金属含量状况,以雷公山自然保护区主峰地段常见植物为研究对象,对其叶片6种重金属元素(Fe、Mn、Zn、Ni、Pb、Cd)进行了测定。结果表明:重金属含量>100mg·kg~(-1)的元素有Fe和Mn,50~100mg·kg~(-1)的元素有Zn,<50mg·kg~(-1)的元素有Pb、Ni和Cd。Fe、Zn、Ni、Cd、Pb为正偏态分布,Mn为负偏态。除Ni外,其余元素在5种植物间的含量均存在显著差异(P<0.05)。该地区植物中Mn、Zn、Ni、Pb、Cd含量均已达到甚至超过中毒水平,存在着受重金属毒害的潜在风险,但除Ni、Pb外,各重金属含量均在世界陆生维管植物相应元素的平均含量范围内。研究区5种植物叶片中的重金属含量分配模式均表现为Mn>Fe>Zn>Pb>Ni>Cd。Fe-Zn、Fe-Cd、Fe-Pb、Zn-Cd、Zn-Pb、Cd-Pb之间均具有显著正相关关系(P<0.05),说明以上各组元素的来源相似且植物对各组元素的吸收具有一定的协同效应。
In order to study the status of plant heavy metals in the forest ecosystem in the nature reserve, six kinds of heavy metal elements (Fe, Mn, Zn, Ni, Pb, Cd) in leaves of Leigongshan Nature Reserve were studied. . The results showed that the elements with the content of heavy metals> 100 mg · kg -1 had Fe and Mn, the elements with the concentration of 50-100 mg · kg -1 had Zn, the elements with the content of <50 mg · kg -1 had Pb, Ni and Cd. Fe, Zn, Ni, Cd and Pb are positively skewed and Mn is negatively skewed. Except for Ni, the contents of the other five elements were significantly different (P <0.05). The contents of Mn, Zn, Ni, Pb and Cd in plants in this area have reached or exceeded the poisoning level, and there is a potential risk of being poisoned by heavy metals. However, with the exception of Ni and Pb, Average content range. The distribution patterns of heavy metals in the leaves of five species in the study area all showed Mn> Fe> Zn> Pb> Ni> Cd. There was a significant positive correlation between Fe-Zn, Fe-Cd, Fe-Pb, Zn-Cd, Zn-Pb and Cd-Pb (P <0.05) Element absorption has some synergistic effect.