Abstract:

In order to discuss the spatial variation characteristics of trace elements in typical area distributed by salinized soils, and provide references for accurate sampling in trace element diagnosis and fertilization, we carried out studies on the spatial variability characteristics of available trace element Fe, Mn, Cu, Zn, B and Mo contents by geo-statistics method in the central part of Tumochuan Plain. The results showed that the contents of available Fe, Mn, Cu, Zn, B and Mo in the soil of studied areas are 5.18 mg/kg, 3.54 mg/kg, 0.91 mg/kg, 0.33 mg/kg, 2.54 mg/kg and 0.11 mg/kg, respectively. The available Zn and Mo were relatively deficient compared to the other elements, and the 6 microelements varied at a moderate intensity. In the studied area, the spatial correlation of available Fe, Mn, Cu, Zn and Mo were moderate or weak, whereas that of available B was strong. The variation range in the 6 available microelements concentrations was Zn>Mn>Cu=Fe>B>Mo. The spatial distributions of 6 microelements showed stripped or spotting shape.

Key words: tumochuan plain, salinized soil, available microelement, spatial variation

摘要：

为了探讨典型盐渍化土壤分布地区土壤微量元素的空间变异特征，并且给盐渍土微量元素养分诊断与施肥的准确性采样提供参考依据。采用地统计学方法，对土默川平原中部盐渍土有效态微量元素Fe、Mn、Cu、Zn、B和Mo含量的空间变异特征进行了研究。结果表明，研究区土壤有效Fe、Mn、Cu、Zn、B和Mo含量分别为5.18 mg/kg、3.54 mg/kg、0.91 mg/kg、0.33 mg/kg、2.54 mg/kg和0.11 mg/kg，有效态Zn和Mo较缺乏，6种微量元素均属中等变异强度。研究区有效态微量元素Fe、Mn、Cu、Zn和Mo具有中等或偏弱的空间相关性,B具有较强的空间相关性；6种微量元素有效态含量的变程大小顺序为Zn> Mn > Cu=Fe>B>Mo。6种微量元素表现出条带状和斑块状的空间分布。

关键词: 土默川平原；盐渍土；有效微量元素；空间变异