岷江下游五通桥区土壤的铅污染分布格局

岷江下游五通桥区土壤的铅污染分布格局 Spatial Heterogeneity and Distribution of Lead in Topsoil of Lower Reaches of Minjiang River,Wutongqiao 杜波 DU Bo1 1 2 3 4 first-author 杨万勤 YANG Wanqin1 1 2 3 4 张健 ZHANG Jian1 1 2 3 4 王鹏 WANG Peng1 1 2 3 4 纪中华 JI Zhonghua2 1 2 3 4 刘洁 LIU Jie1 1 2 3 4 四川农业大学林业生态工程重点实验室 四川农业大学林业生态工程重点实验室 Key Laboratory of Forestry Ecological Engineering,Sichuan Agricultural University,Yaan 625014,Sichuang Key Laboratory of Forestry Ecological Engineering,Sichuan Agricultural University,Yaan 625014,Sichuang 云南省农业科学院热区生态农业研究所 云南省农业科学院热区生态农业研究所 Institute of Tropical Eco-Agricultural Sciences,Yunnan Academy of Agricultural Sciences,Yuanmou Institute of Tropical Eco-Agricultural Sciences,Yunnan Academy of Agricultural Sciences,Yuanmou 四川农业大学林业生态工程重点实验室,四川,雅安,625014 四川农业大学林业生态工程重点实验室,四川,雅安,625014 云南元谋,651300 云南元谋,651300 在岷江下游五通桥区境内采集了93个土壤样品,分析检测其重金属Pb的含量水平.在ARCGIS等地理信息系统软件的支持下,以地统计学原理等空间分析方法,分析数据的空间自相关特征以及变异函数特征,以讨论流域范围内的Pb污染分布格局.结果表明:研究区的土壤Pb含量水平较背景值增加了14.88%,具有大范围低强度的Pb污染特征;城乡结合部和沿岷江两岸是Pb污染的主要发生区;土壤Pb的分布具有一定的空间异质性,其空间自相关性和分布格局与岷江的地理走向关系密切,初步认为Pb元素有沿岷江向下游迁移的趋势;区域范围内的Pb污染来源较为隐蔽且不确定,具有一定的面源污染特征. The application of spatial heterogeneity analysis based on geographical information system（GIS） to environmental geochemistry was studied.Spatial analysis methods,including geostatistics and spatial autocorrelation,were used for lead content in 93 topsoil samples from Wutongqiao county at the lower reaches of Minjiang River,for analyzing the lead spatial heterogeneity in topsoil and its pollution characteristic.The results of geostatistics showed that the lead content had good spatial structure and its semi-variogram can be fitted by exponential model.The distribution characteristics of Pb in soil was shown obviously anisotropy and had significant spatial autocorrelation at the Minjiang River’s azimuth,deduced the lead in soil had a migration tendency along the Minjing River.The map of classification of soil Pb content by Kriging method showed the bank and urban-rural marginal area were the mainly contaminative area,preliminary result indicated there had Non-point source pollution of lead at these areas. 岷江 土壤 重金属污染 铅 区域化变量 空间异质性 半变异函数 Minjiang River soil heavy metal pollution lead regionalized variables spatial heterogeneity semi-variogram X53 “十一五”国家科技支撑计划项目（2006BAC01A11）;四川省公益性重大项目（2007NGY006）资助 2008-02-01 2021-04-01 2