重金属污染对赣南2种植物叶片分解的影响

Effects of Heavy Metal Pollution on Leaf Decomposition of Two Plants in Southern Jiangxi

赣南矿区锌、铜、镉等重金属含量远远高于江西省土壤背景值,具有潜在的生态风险.以赣南重金属污染数据为依据确定锌、铜、镉污染浓度,在实验室内模拟锌、铜、镉3种重金属污染,研究重金属污染对脐橙和樟树这2种赣江流域重要树种叶片凋落物分解的影响.结果表明:重金属污染抑制凋落物的分解,加速凋落物中氮元素损失,导致锰元素富集.脐橙和樟树叶片的分解因初始化学成分差异而存在显著差异,脐橙叶片比樟树叶片更容易分解.这2种植物叶片分解对重金属的响应也存在部分差异.因此,重金属污染会影响土壤的养分循环,加重其他重金属元素(如锰)的富集.赣南地区重金属污染对土壤养分循环的影响应受到重视.

The content of zinc(Zn),copper(Cu)and cadmium(Cd)and other heavy metals in the mining area of southern Jiangxi is much higher than the background value of soil in Jiangxi province,which has the potential ecological risk.The concentrations of Zn,Cu and Cd were determined based on the data of heavy metal pollution in southern Jiangxi.The effects of heavy metal pollution on leaf litter decomposition of navel orange and camphor tree in Ganjiang River basin were studied by simulating Zn,Cu and Cd pollution in laboratory.The results showed that heavy metal pollution inhibited the decomposition of litters,accelerated the loss of nitrogen in litters,and led to the enrichment of manganese(Mn).The decomposition of navel orange and camphor leaves was significantly different due to the difference in initial chemical composition,and the decomposition of navel orange leaves was easier than camphor leaves.There were partial differences in leaf decomposition responses to heavy metals between the two plants.Therefore,heavy metal pollution can affect soil nutrient cycling and increase the enrichment of other heavy metals(such as Mn).The effects of heavy metal pollution on soil nutrient cycling in southern Jiangxi should be paid attention to.