黄土高原草地土壤微量元素分布特征研究

Study on Distribution Characteristics Soil Trace Elements of Grass Land in the Loess Plateau

通过实地调查采样,结合室内分析,研究了陕北黄土高原不同地形条件下草地土壤微量元素分布特征。结果表明:草地土壤全量铜、铁、锰均属于小变异和中等变异土壤性质;全量锌变异跨度较大,属于小变异、中等变异以及高度变异土壤性质;有效态微量元素的变异程度因元素不同各异,但均达到了中等或高度变异程度。草地土壤全铁和全锌含量以峁坡高于沟坡;全铜和全锰以沟坡高于峁坡。坡面降雨和植物的存在引起了全量微量元素的差异。有效态微量元素均以沟坡高于峁坡,不同地形条件下土壤有效态微量元素含量的分布差异是由土壤有机质含量以及成土母质决定的。

Through field surveys and sampling,combined with laboratory analysis,study of the distribution characteristics of trace elements in grassland soils under different terrain conditions in Loess Plateau.The experiments indicate that the total copper,iron,manganese of grassland soil belong to the small variation and moderate variability of soil properties;total zinc has a big spans of variation,it belonging to a small variation,medium and high variability of soil properties;available trace elements has different variation degree because of different elements,but it all has reached the moderate or high variation.Total content of iron and zinc of grassland soil in hill slope were higher than in gully slope,total copper and manganese were higher in gully slope soil.Rainfall of a slope and the presence of plants have caused the difference of soil total trace elements.Available trace elements of grassland soil in gully slope,were higher than in hill slope,the distribution difference of available trace elements conent in different topography were determined by Soil organic matter content and soil parent materials.