The spatial distribution pattern of heavy metals and risk assessment of moso bamboo forest soil around lead–zinc mine in Southeastern China
The spatial distribution pattern of heavy metals and risk assessment of moso bamboo forest soil around lead–zinc mine in Southeastern China
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DOI：
10.1016/j.still.2015.05.013
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发表时间：
2015-11
影响因子：
6.5
通讯作者：
W. Yan;Q. Mahmood;D. Peng;W. Fu;Tao Chen;Ying Wang;Song Li;Jun-ren Chen;Dan Liu
中科院分区：
文献类型：
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作者：
W. Yan;Q. Mahmood;D. Peng;W. Fu;Tao Chen;Ying Wang;Song Li;Jun-ren Chen;Dan Liu
中国东南部是毗邻矿区的毛竹的广阔栖息地。土壤重金属污染对该地区的竹林构成了极大的威胁。本研究旨在测定矿区土壤和竹笋中重金属的含量，研究矿区土壤重金属的空间分布特征，分析矿区土壤重金属污染与竹笋的空间相关性，并对矿区土壤重金属污染进行风险评价。在研究区采集了97个土壤样品，对矿区周边竹林土壤的重金属污染状况进行了评价。土壤中Cd、Cr、Cu、Mn、Pb和Zn的平均含量分别为0.50 mg kg−1、58.31 mg kg−1、27.89 mg kg−1、405.89 mg kg −1、286.32 mg kg−1和209.53 mg kg−1。相关性分析表明，除Cr外，土壤中金属形态大多超过阈值，并因采矿活动而积累。此外，研究区毛竹根茎中重金属含量均较低，按其存在程度排序为：Zn > Mn > Cu > Pb > Cr > Cd。空间统计和自相关分析表明，大部分土壤重金属呈现出地理上的同心圆趋势（从周边地区到采矿中心）。土壤中重金属含量与竹笋中重金属含量之间的相关性较低。竹笋中铅含量超标，且与土壤中铅含量存在空间相关性。土壤中重金属的分布是其在蔬菜可食部位富集的主要原因。风险评估证实，约60.82%的研究区域遭受金属污染。该污染评价图可为粮食安全和竹林分类管理提供参考。
Southeast China serves as a vast habitat of moso bamboo situated adjacent to the mining area. Heavy metal contamination of the soils poses a great threat to bamboo plantations in the region. The present study aimed at determination of the heavy metals concentration in mined soils and bamboo shoot, the spatial distribution pattern of heavy metals in soils and the spatial correlations between heavy metal pollution in soils and bamboo shoots, and risk assessment of metals in soil. The soil samples (97) were collected from the study area to assess the status of metal pollution in soils adjacent to bamboo plantations around the mining area of southeast China. The median soil Cd, Cr, Cu, Mn, Pb and Zn concentrations were 0.50 mg kg−1, 58.31 mg kg−1, 27.89 mg kg−1, 405.89 mg kg−1, 286.32 mg kg−1, 209.53 mg kg−1, respectively. Correlation analysis suggested that soil metal species except Cr mostly exceeded the threshold values and accumulated as a result of mining activities. In addition, the mean heavy metals concentrations in moso bamboo rhizome were very low from the study area; the metals could be based on their prevalence as: Zn > Mn > Cu > Pb > Cr > Cd. The spatial statistics and autocorrelation analysis showed that most of the soil heavy metals represented a geographically increasing concentric trend (from the surrounding area to mining center). A low correlation existed between metals concentrations of soil and bamboo shoots. Pb concentrations in bamboo shoots exceeded the standard limits and supposed to have spatial correlation with its concentration in soil. The metal distributions in soil were held responsible for their bioaccumulation in edible portions of vegetables. The risk assessment confirmed that about 60.82% of the study area suffered from metal contamination. The pollution evaluation map provides a reference for the food security and the classification management of bamboo forest.