乌鲁木齐市蔬菜基地土壤有效态镉的空间变异特征

Spatial Variation of soil available Cd in Urumqi Vegetable Base

以乌鲁木齐市北郊蔬菜基地为典型区,对干旱区绿洲城市郊区土壤有效态镉含量的结构特征进行分析,得出该区有效态镉的空间分布格局,并揭示了引起这种分布格局的成因和污染来源。结果表明,乌鲁木齐市北郊蔬菜基地有效态镉属中等变异。半方差函数模型拟合表明,有效态镉含量可以用指数函数拟合,且在一定范围内存在空间相关性。采用Kriging最优内插法得到有效态镉含量的空间分布格局,表明土壤有效态镉含量与工业活动、污水灌溉和大气降尘密切相关。

Based on typical vegetable base in Urumqi northern suburbs,structure characteristic of oasis city soil available Cd content in arid region was analyzed and spatial distribution was studied.The results showed that available Cd of vegetable base in Urumqi northern suburds was medium variations.Available Cd semivariance model fitted showed spatial correlation.Spatial distribution pattern of available Cd content was studied using Kriging optimal interpolation.Soil available Cd content had correlation with industry activity,savage irrigation and dustfall.