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《Environmental Science》 2015-01
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Spatial Distribution of Mercury in Soils of a Typical Small Agricultural Watershed in the Three Gorges Reservoir Region

WANG Ya;ZHAO Zheng;MU Zhi-jian;WANG Ding-yong;YU Ya-wei;College of Resource and Environment,Southwest University;Chongqing Engineering Research Center for Agricultural Non-point Source Pollution Control in the Three Gorges Reservoir Area;Chongqing Key Laboratory of Agricultural Resources and Environment;  
To understand the mercury( Hg) pollution level and the corresponding ecological risk in agricultural watershed of the Three Gorges Reservoir region,a typical watershed,Wangjiagou,located in Fuling,where is in interior zones of the Three Gorges Reservoir region,was selected as the study object. Meanwhile,Arc GIS geo-statistics module was conducted for investigation of the Hg contents and distribution characteristics in soils of different land use types including dry land,farmland,woodland and settlements. Also the corresponding Hg pollution level and ecological risk were assessed. The results suggested that soil Hg contents in this watershed ranged from 9. 47 to 94. 57 μg·kg-1,and the mean value was( 34. 23 ± 16. 23) μg·kg-1. Higher Hg contents in surfaces of soils were observed in woodland,followed by farmland and settlement. The lowest was found in dry land. Surfaces of soils significantly showed Hg accumulation,and an obvious inverse correlation between soil Hg contents and soil depths was also observed in this study.Additionally,geo-statistics analysis showed a weak spatial correlation of soil Hg contents in this watershed,indicating the spatial distribution of soil Hg in this watershed was mainly influenced by several natural factors such as atmospheric wet-dry deposit,vegetation coverage and topography,instead of anthropogenic interference. Overall confirmative soil Hg pollution was not found in this watershed,which showed a very low pollution index(-0. 08),but a moderate potential ecological risk still existed( the ecological risk index was57),of which woodland had the highest potential risk. The total capacity of Hg in this watershed was 25. 39 kg,among which dry land accounted for 69%.
【Fund】: 国家重点基础研究发展规划(973)项目(2013CB430004);; 国家自然科学基金项目(41373113 41173116)
【CateGory Index】: X53
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