%0 Journal Article
%T Spatial variability of farmland heavy metals contents in Qianan City<br>迁安市农田重金属含量空间变异性
%A WANG Bo
%A WANG Yuanzhong
%A LI Dongmei
%A GAO Yunfeng
%A Mao Renzhao
%A <br>王波
%A 王元仲
%A 李冬梅
%A 高云凤
%A 毛任钊
%J 应用生态学报
%D 2006
%I 
%X By the methods of geostatistics and GIS, this paper studied the spatial variability of Cu, Zn, Ni, Cr As, Hg, Cd and Pb contents in the farmland topsoil (0 -20 cm) of Qianan City, Hebei Province. The results showed that the average contents of test metals were under the secondary standard of environmental quality standard for soil (GB 15618-1995), and belonged to moderate variability. The theoretical models of semi-variance of Cu, Zn, Ni, Cr and As contents fitted exponential models, and their spatial correlations were strongly spatial dependence; while the theoretical models of Hg and Cd contents fitted spherical models, and their spatial correlations were moderately spatial dependence. The Pb content had pure nugget effect, and was weakly spatial dependence. In whole research scale, Pb content had lasting variability, while the other seven heavy metals contents had the spatial variability mainly caused by their spatial correlation parts. The ranges of heavy metals spatial correlations were about 11 km to 20 km. The Kriging' s interpolation of Cu, Zn, Ni, Cr, Hg, As and Cd contents showed that their contents were higher in northern mountainous area, but lower in mid basin.
%K Geostatistics
%K Heavy metal
%K Spatial variability
%K Geographical information system (GIS)<br>地统计学
%K 重金属
%K 空间变异性
%K 地理信息系统(GIS)
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=42FEDDFE54F8BCD9D5FD1926ABDD7722&aid=D0CA5803F019CE00&yid=37904DC365DD7266&vid=BCA2697F357F2001&iid=5D311CA918CA9A03&sid=033F76C1E79F93E7&eid=4C25EB18BC5AA509&journal_id=1001-9332&journal_name=应用生态学报&referenced_num=7&reference_num=32