山东省青州市表层土壤硒元素地球化学特征

Geochemical Characteristics of Selenium in Surface Soil of Qingzhou,Shandong

为研究山东省青州市表层土壤硒元素地球化学特征,在青州市按照平均5.2件/km^(2)的密度采集了8132件表层土壤样品,分析了硒、有机质、pH等指标。结果表明:青州市表层土壤硒含量范围在0.02~2.77 mg/kg,背景值为0.21 mg/kg(n=7462)。研究区富硒土壤面积为140.56 km^(2),占研究区总面积的9.00%;足硒土壤面积为1248.39 km^(2),占研究区总面积的79.93%;潜在硒不足土壤面积为148.45 km^(2),占研究区总面积的9.50%;硒缺乏土壤面积为24.52 km^(2),占研究区总面积的1.57%。不同的成土母质、土壤类型、地貌类型、土地利用类型区的表层土壤硒含量特征不同,寒武纪—奥陶纪地层成土母质区、钙质粗骨土分布区、溶蚀—切割中山地貌类型区、草地和林地土地利用类型区的表层土壤中硒相对富集。相关分析表明,研究区表层土壤中pH和硒含量无相关性,而有机质与硒含量呈显著正相关关系。

In order to study the geochemical characteristics of selenium in surface soil of Qingzhou in Shandong Province,8,132 surface soil samples were collected with the average density of 5.2 pieces/km^(2) in Qingzhou and the selenium content,organic matter,pH and other indicators were analyzed.The results showed that the selenium content in surface soil ranged from 0.02 to 2.77 mg/kg and the background value was 0.21 mg/kg(n=7,462).The area of selenium-abundant soil in the study area is 140.56 km^(2),accounting for 9.00%of the study area.The area of selenium-sufficient soil is 1,248.39 km^(2),accounting for 79.93%of the study area;the area of potential selenium-deficiency soil is 148.45 km^(2),accounting for 9.50%of the study area;the area of selenium-deficient soil is 24.52 km^(2),accounting for 1.57%of the study area.Selenium in surface soil has different characteristics in different geological units,soil types,landform types and land-use types.Selenium is relatively accumulated in the surface soil with Cambrian-Ordovician parent material,clay soil type,dissolution or moderate-cutting landform type,grassland and woodland land-use type.Correlation analysis showed that there was no correlation between pH and selenium content in surface soil of the study area,but there was a significant positive correlation between organic matter and selenium content.