为探明干旱区敏感性较强的荒漠—绿洲过渡带上土壤重金属的空间分布及污染现状，对夏尔希里地区两种典型植被群落下各重金属的水平分布、垂直分布、相关性和综合污染指数进行研究。结果表明：土壤重金属具有表聚现象，其含量在0～30 cm㎝处相对较高，在50～60 cm 处较低；土壤重金属各特征值的分布表现为：芨芨草群落＞羊草群落；土壤重金属空间分布中，Cr ，Cu ，Pb 在研究区西部分布相对较高，Zn 规律性分布较强整体呈东高西低的趋势；相关性分析中，芨芨草群落下土壤重金属较有机质间的相关性明显大于羊草群落（ P ＜0．05）；重金属污染评价中，羊草群落下各重金属污染指数均小于芨芨草群落。%In order to explore the spatial distribution and pollution status of heavy metal elements in soil of arid area on Desert-oasis Ecotone that has high sensitivity ,the level of heavy metals distribution ,vertical distribution ,correlation studies and integrated pollution index under two kinds of typical plant communities were carried out in Xiaerxili region . Results showed that heavy metal had surface aggregation phenomenon in soil ,and its content was relatively high in the 0~ 30 cm layer ,whereas remained low in the 50 ~ 60 cm layer .Various characteristic values distribution of soil heavy metals for Achnatherum splendens community was higher than those for Leymus chinensis community .For spatial distribu-tion of heavy metals ,Cr ,Cu and Pb in the western area of the study area was relatively high .Zn had a strong distribu-tion pattern that Zn tended to be high in east and low in west .Correlation analysis showed that correlations among organic matters of heavy metals for Achnatherum splendens community were stronger than those for Leymus (P< 0 .05) .In con-clusion ,the evaluation indicates that heavy metal pollution in the Leymus chinensis community under heavy metal pollu-tion index was less than that in Achnatherum splendens community .
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