%0 Journal Article
%T Multivariate Geostatistical and GIS-based Approach to Study the Spatial Distribution of Soil Heavy Metals in Field Scale<br>小尺度农田土壤中重金属的统计分析与空间分布研究
%A LU An-xiang
%A WANG Ji-hu
%A PAN Yu-chun
%A MA Zhi-hong
%A ZHAO Chun-jiang
%A <br>陆安祥
%A 王纪华
%A 潘瑜春
%A 马智宏
%A 赵春江
%J 环境科学
%D 2007
%I 
%X One hundred and two surface soil samples were collected from four fields in a farm in Daxing district of Beijing, and analyzed for concentration of Cu, Zn, Pb, Cr and Cd. Soil pH, OM, the concentration of Fe and Mn was also analyzed. The results of statistical analysis indicated there was no significant difference among three wheat fields, but the difference between wheat field and vegetable field was evident. In the wheat fields, the concentration of heavy metals in soil was all below the critical value of first level in environmental quality standard for soils. On the contrary, the concentration of Cd in some plots of vegetable field exceeded the critical value of second first level in environmental quality standard for soils. Principal component analysis was applied to estimate the sources of heavy metals. The results grouped Cu, Cd, and Zn in factor 1, Cr in factor 2, Pb in factor 3. Semivariogram of factors in the whole farm was fitted well by Gausssian model. Further analysis showed good spatial correlation of factor 1, and poor spatial correlation of factor 2 and factor 3. The approach of ordinary kriging interpolation approved the Cu, Cd, Zn in the soil was associated with the agricultural landuse. The distribution of heavy metals was mainly attributed to the excessive input of fertilizer and pesticide in vegetable product practice.
%K heavy metals
%K soil
%K principal component analysis
%K field scale<br>重金属
%K 土壤
%K 主成分分析
%K 小尺度
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=BC85E858628321E13EEE22C5C9CCAEBA&yid=A732AF04DDA03BB3&vid=D3E34374A0D77D7F&iid=DF92D298D3FF1E6E&sid=6DC9B9BB39B3E540&eid=39AB3D3C12DB6AFD&journal_id=0250-3301&journal_name=环境科学&referenced_num=1&reference_num=27