若尔盖高寒盆地地表水重金属含量特征及空间分布

The Spatial Distribution of Metals in Surface Water of Zoige Alpine Bbasin

采用GIS、GPS和Kriging插值方法,网格法采样,测定冷季和暖季As、Cr、Pb等7种重金属元素含量。结果显示,Cd、Cu、Co含量暖季高于冷季(P<0.01);Cr含量暖季低于冷季(P<0.01),且超过国家地表水环境质量标准Ⅲ类3~7倍;其他6种元素均低于国家标准。暖季,As与Co、Pb,Cu与Cd、Cr,Co与Pb呈正相关(P<0.01);冷季,Cu与Co、Cd呈正相关(P<0.01),Cu与Ni、Pb,Co与Pb呈负相关(P<0.01);冷季和暖季Cr、Cu、Co和Ni含量呈斑块分布,其余主要呈连续变化分布。结论:Cr含量超过国家标准,相关地区相应季节放牧时,应避开流动性小的地表水。

In this paper, the spatial patterns of metals in surface water of Zoige Alpine basin were studied using the methods of GIS, GPS and geostatistics. Seven metals, e. g. As, Cr, Pb, etc. , were measured in cold and warm season. It was found the contents of Cd, Cu and Co were higher in warm season than in cold season （ P 〈 0. 01 ） , and the value of Cr is lower in warm season compared to cold sea- son （ P 〈 0. 01 ）. In warm season, As has positive correlation with Co and Pb, and Cu and Co is positivelly corelated with Cd, Cr, and Co, Pb, respectively. In cold season, Cu is positvely correlated with Co and Cd, while Cu has negative correlation with Ni and Pb （P 〈0. 01 ）.