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地球科学进展  2017, Vol. 32 Issue (8): 875-884    DOI: 10.11867/j.issn.1001-8166.2017.08.0875
应用地球化学专辑     
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
宗庆霞1, 窦磊2, 侯青叶1, *, 杨忠芳1, 游远航3, 唐志敏1, 4
1.中国地质大学(北京)地球科学与资源学院,北京 100083;
2.广东省地质调查院,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
Regional Ecological Risk Assessment of Soil Heavy Metals in Pearl River Delta Economic Zone Based on Different Land Uses
Zong Qingxia1, Dou Lei2, Hou Qingye1, *, Yang Zhongfang1, You Yuanhang3, Tang Zhimin1, 4
1.School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing 100083, China;
2.Guangdong Institute of Geological Survey, Guangzhou 510080, China;
3.No.3 Geological Brigade of Guangdong Bureau of Geology, Guangdong Shaoguan 512023, China;
4.Nanjing Center, China Geological Survey, Nanjing 210016, China
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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。

关键词: 珠江三角洲土壤重金属土地利用类型生态风险评价    
Abstract:

Based on the results of regional eco-geochemical survey in Pearl River Delta Economic Zone and the local land use patterns, two conventional risk assessment models are introduced to evaluate the ecological risk of eight heavy metals in the topsoil (0~20 cm) of Pearl River Delta. The spatial distribution characteristics of risk caused by metals in the region were characterized by GIS. Results show that As、Cd、Cu and Hg in the topsoil are the primary heavy metals posing risk to the Pearl River Delta while Cr and Zn are negligible. Meanwhile, 23.89% of soil samples have a hazard index of more than 1 which suggests that it is likely to cause chronic diseases in the region. The soils with high hazard index are mainly distributed in the Quaternary area. 37.22% of soil samples have a negligible chronic risk level, of which the spatial distribution is consistent with granite area. Moreover, the spatial distribution of carcinogenic risk is similar to chronic risk, where 25.68% of samples exceed the cancer risk index (1×10-4) recommended by USEPA. Furthermore, the evaluation results presented at administrative units indicate that there are both higher chronic and cancer risk in Panyu and Nansha district where more attentions should be paid to.

Key words: Ecological risk assessment    Land use.    Pearl River Delta    Soil heavy metals
收稿日期: 2017-02-24 出版日期: 2017-08-20
ZTFLH:  P934  
基金资助:

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

通讯作者: 侯青叶(1978-),女,山西临汾人,副教授,主要从事区域地球化学和环境地球化学研究.E-mail:qingyehou@126.com   
作者简介: 宗庆霞(1991-),女,四川自贡人,硕士研究生,主要从事环境地球化学研究.E-mail:qingxiazong@163.com
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引用本文:

宗庆霞, 窦磊, 侯青叶, 杨忠芳, 游远航, 唐志敏. 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[J]. 地球科学进展, 2017, 32(8): 875-884.

Zong Qingxia, Dou Lei, Hou Qingye, Yang Zhongfang, You Yuanhang, Tang Zhimin. Regional Ecological Risk Assessment of Soil Heavy Metals in Pearl River Delta Economic Zone Based on Different Land Uses. Advances in Earth Science, 2017, 32(8): 875-884.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2017.08.0875        http://www.adearth.ac.cn/CN/Y2017/V32/I8/875

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