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研究了黄土沟壑区小流域塬面、坡地、梯田和沟道土壤微量元素的剖面分布特征,以揭示不同地形条件下微量元素的有效性及地球化学特性.结果表明,不同土层土壤全量微量元素的变异系数均小于15%,为小变异土壤性质,有效态和吸附态铁和锰的变异系数均高于36%,为高度变异土壤性质;有效态和吸附态锌和铜属于中到高度变异.全量铁、锰和铜以沟道土壤较高,全锌、有效态和吸附态微量元素含量以塬面土壤较高.不同形态微量元素的剖面分布趋势取决于地形条件.不同地形下成土过程及不同地形条件所对应的土地利用方式造成了全量微量元素的差异,而土壤有机质含量的差异是不同地形条件下有效态和吸附态微量元素剖面分布特征不同的主要原因.
The distribution characteristics of trace elements in the topsoil, slope, terraces and channel soil in loess hilly and gully regions were studied to reveal the availability and geochemical characteristics of trace elements under different topographical conditions.The results showed that total trace elements , The coefficient of variation (CV) was less than 15%, and for small soil properties, the coefficients of variation of effective and adsorbed iron and manganese were all above 36%, which were highly variable soil properties; available and adsorbed zinc and copper belonged to medium to high variation .The total amount of iron, manganese and copper in the channel soil was higher, while the total zinc, available state and the content of trace elements in the adsorbed soil were higher in the plateau.The trend of the distribution of the trace elements in different forms depends on the topography.The soil under different topography The process and the land use patterns corresponding to different topographic conditions caused the total trace element differences. However, the differences in soil organic matter content were the main reasons for the different profiles of available trace elements and trace elements in different topography.