贵州省开阳县土壤硒含量及其制约因素研究

以贵州省开阳县禾丰乡和冯三镇典型土壤为对象,采用环境与地球化学相结合的方法,研究了该区土壤中硒元素的含量、分布及制约因素.结果表明:研究区土壤硒含量范围在0.46～2.31mg/kg,均值为1.42mg/kg,高于全国平均值0.29mg/kg,多数土壤达到富硒、高硒水平;硒含量在水平方向上在不同地层、同一地层的不同采样点及同一采样点的不同部位都存在着明显的空间差异,在土壤剖面上总体趋势是硒元素多富集于表层土壤中;开阳地区富硒岩层和广泛出露含硒量高的石煤层,是开阳地区存在富硒土壤的主要原因.

Study on the selenium contents level and restriction factors in the soil in Kaiyang of Guizhou

The Se contents,distribution and restriction factors in the soils were studied based on typical soils in Hefeng Country and Fengsan Town in the region of Kaiyang of Guizhou Province with methods of environment and geochemistry.The results indicated that soil Se contents were within the range of 0.46~2.31 mg/kg,with an average of 1.42 mg/kg,surpassed the average of the whole country 0.29 mg/kg,most soils reached Se-enrichment or Se-high level;spatial difference of the Se contents existed in different layers,different sampling points of the same layer and different position of sampling point,and the whole tendency was that Se was mostly gathering in superficial soil in the profile direction of soil;the main restriction factor of Se-enriched soils in Kaiyang region was the Se-enriched layers and widely exposed foundation rock.