宁夏石嘴山地区土壤中硫的地球化学特征及其来源分析

Geochemical Characteristics and Source Analysis of Soil Sulfur in Shizuishan Area

以宁夏石嘴山地区土壤中的S为研究对象,分析不同类型表层土壤中S的质量含量分布特征及其垂向变化.结果表明,宁夏石嘴山地区土壤中S的质量含量整体以丰富区为主,占研究区土地总面积的71.84%.过量区和缺乏区均有分布,分别占研究区土地总面积的8.03%,4.42%,过量区与土壤重度盐渍化分布地区重合,缺乏区主要以风沙土为主.该地区表层土壤中S在盐土中的质量含量最高,在灰钙土、风沙土和灌淤土中较低.S的表生富集作用明显,大气干湿沉降物及植物吸收对表层土壤中S的质量含量影响较小,该地区表层土壤中S的质量含量与全盐量关系密切.

Taking the sulfur element in the soil of Shizuishan area as the research object,this paper analyzes the distribution characteristics and vertical changes of sulfur in different types of surface soils.The results show that the overall soil sulphur content in Shizuishan is dominated by rich areas,accounting for 71.84% of the land area of the study area.Both excess and deficiency zones are distributed,accounting for 8.03% and 4.42% of the land area of the study area respectively.The excess zone overlaps with the distribution area of heavy soil salinization,while the deficiency zone is mainly dominated by wind-sand soils.The content of sulfur in surface soil of Shizuishan area is the highest in saline soil,but lower in calcareous soil,aeolian sand soil and irrigated silt soil.The superficial enrichment of sulfur is obvious.The analysis concludes that dry and wet atmospheric deposition and plant uptake,for example,have a small effect on the sulphur content of the surface soil.The sulfur content of the surface soil in the study area is closely related to the total salt content,and it changes with the change of the total soil salt content.Salts from the subsoil or groundwater rise to the surface with capillary water and evaporation of the water and cause the salts to accumulate in the surface soil,leading to an accumulation of elevated sulphur levels in the surface soil.