中文摘要：

通过对沙雅绿洲耕地土壤微量元素的含量及空间变异特征研究。结果表明，土壤中Cu、Zn、Fe、Mn元素空间分布均属于中等变异；从土壤微量元素拟合的理论模型可知，Fe、Mn、Zn元素的最适合模型为球形模型，Cu元素的最适合模型为指数模型。其中Fe、Cu元素的拟合效果最理想，决定系数分别为0．714和0．918，Zn元素的拟合最差；土壤中Cu元素的块金值／基台值为42．8％，大于25％，表明具有中等的空间相关性，Fe、Mn、Zn元素的块金值／基台值均小于25％，系统具有强烈的空间相关性；Fe元素与土壤电导率（EC）成显著正相关，Cu元素与EC极显著正相关；Mn、Zn元素与有机质（OM）均成极显著正相关；Fe、Cu元素与pH值成极显著负相关，Mn元素与pH值成显著正相关；不同的土壤类型对有效Fe、Mn、Zn元素的含量影响显著，Cu元素差异不显著。

英文摘要：

Through analyzing several microelements content and it＇s spatial variation characteristics in the oasis,the results show that：The coefficient of variation Cv of Cu,Zn,Mn and Fe belong to moderate variability;The best fitted semivariogram model of soil available Fe,Mn and Zn is spherical model and the best fitted semivariogram model for Cu is exponential model. The fitting results of Fe and Cu are better than Zn,the coefficient of determination of Fe and Cu is 0. 714 and 0. 918 respectively. The nugget-sill rati- os of Cu is 42.8~, more than 25~//oo ,indicating moderate spatial correlation; and the nugget-sill ratios of Fe,Mn and Zn is less than 25 %,indicating strong spatial correlation; There is significant positive correla- tion between Fe and EC,Cu had a highly significant positive correlation with EC; both Mn and Zn had a significant negative correlation with OM;Fe and Cu had a significant negative correlation with pH;Mn had a significant positive correlation with pH;The different soil type had significant impact on content of Fe, Mn and Zn,but no significant impact on soil Cu content.