基于土地利用类型的土壤重金属区域生态风险评价:以珠江三角洲经济区为例

发布时间：2017-12-28 09:21

本文关键词：基于土地利用类型的土壤重金属区域生态风险评价:以珠江三角洲经济区为例　出处：《地球科学进展》2017年08期 　论文类型：期刊论文

【摘要】：引用国外较成熟的2种风险评价模型,基于珠江三角洲经济区生态地球化学调查结果,结合研究区土地利用现状对珠江三角洲表层土壤(0~20 cm)8种重金属的生态风险进行评价,并采用GIS技术表征重金属在区域空间上的风险分布特征。结果表明:珠江三角洲的土壤重金属风险主要来自于As,Cd,Cu,Hg元素,Cr和Zn几乎不存在风险。23.89%的土壤慢性风险指数大于1,表明有引发慢性病的可能,风险高值区主要分布在第四系平原区。37.22%的土壤几乎不存在慢性风险,其空间分布与珠江三角洲花岗岩分布较为一致。致癌风险空间分布与慢性风险相似,25.68%的土壤致癌风险指数超过了美国环保署推荐的1×10-4。基于行政单元的人体健康风险区划表明番禺区和南沙区均存在较高的风险,应当引起足够重视。
[Abstract]:Quote 2 risk assessment model is mature, the ecological geochemical survey in the Pearl River Delta Economic Zone Based on the combination of the status quo of land use in the surface soil of the Pearl River Delta research area (0~20 cm) to evaluate the ecological risk of 8 kinds of heavy metals, and the risk distribution in the region GIS on the characteristics of heavy metals. The results showed that the risk of heavy metals in the soil of the Pearl River Delta mainly came from As, Cd, Cu, Hg, and Cr and Zn were almost no risk. 23.89% of the soil chronic risk index is more than 1, indicating the possibility of causing chronic disease, and the high risk area is mainly distributed in the Quaternary plain area. There is almost no chronic risk in 37.22% of the soil, and its spatial distribution is more consistent with the distribution of granite in the Pearl River Delta. The spatial distribution of cancer risk is similar to that of chronic risk, and 25.68% of the risk index of soil carcinogenesis is more than 1 * 10-4 recommended by the United States Environmental Protection Agency. The human health risk zoning based on administrative units shows that there are high risks in both Panyu District and Nansha District, which should be paid enough attention.
【作者单位】：中国地质大学(北京)地球科学与资源学院;广东省地质调查院;广东省地质局第三地质大队;中国地质调查局南京地质调查中心;
【基金】：中国地质调查局地质大调查项目“珠江三角洲土壤重金属地球化学成因与风险评价”(编号:12120115050401)和“珠江三角洲土壤重金属成因与生态风险评价”(编号:121201108000150012-10)资助~~
【分类号】：X826
【正文快照】： 广东广州510080;3.广东省地质局第三地质大队,广东韶关512023;4.中国地质调查局南京地质调查中心,江苏南京210016)1引言生态风险评价是评估因暴露于单个或多个污染因子而产生生态负面影响可能性的过程[1]。自1998年美国环保署(US Environmental Protection A-gency,USEPA)正式

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