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《Geographical Research》 2011-01
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Spatial distribution and pollution assessment of Zn in urban soils of Yibin,Sichuan Province

GUO Guang-hui1,2,ZHANG Hang-cheng3(1.Guangzhou Institute of Geochemistry,CAS,Guangzhou 510640,China;2.Graduate University of Chinese Academy of Science,Beijing 100049,China;3.Urban and Rural Planning Authority of Wenchuan County,Wenchuan 623000,Sichuan,China)  
Urban soils are regarded as recipient of large amounts of heavy metals from various sources.Information on the environmental effects of different functional zones is lacking,especially in Yibin,a city with a rapidly increasing rate of development.Such information will assist in developing strategies to protect urban environment against long-term hazardous accumulation. In order to identify the concentration and spatial distribution of Zn in urban soils,63 topsoil samples of Yibin,Sichuan Province,were collected and analyzed with geo-statistics extent based on GIS.The results showed the concentration of Zn in the soils of Yibin ranged from 36.16 to 362.15 mg/kg,with the average value of 138.88 mg/kg,which is apparently higher than the background value of Sichuan Province(p=0.000).Moreover,compared with the soil baseline value of Sichuan Province,28.57% of the samples exceeded this reference.The concentrations of Zn in industrial areas,traffic areas and commercial areas were significantly higher than the background value,respectively.Using the soil-baseline concentration as a criteria,71.42%,41.67% and 33.3% of the samples in industrial areas,commercial areas and traffic areas exceeded the limit,respectively.The geo-statistical analysis showed that the spatial correlations of Zn belonged to the medium degree,indicating that the concentration of Zn in the soils was influenced by the random factor and structural factor.Spatial distribution of Zn pollution accumulative index produced by kriging showed that Zn exhibited serious pollution risk in Shangjiangbei and Xiajiangbei districts,and that soils in Cuiping and Nan'an districts were contaminated by Zn to some degree,particularly in industrial areas,commercial areas and traffic areas.
【Fund】: 四川省青年基金项目(2007Q04)
【CateGory Index】: X53
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