广西北部湾沿海经济区富硒土壤地球化学特征

Geochemical characteristics of selenium-rich soil in Beibu Gulf coastal economic zone of Guangxi

通过对广西北部湾沿海经济区土壤硒含量调查,研究了土壤总硒含量的分布特征、成因来源及其与土壤理化性质的关系。研究结果表明,表层土壤总硒含量为（0.06~0.90）×10^-6,平均值为0.44×10^-6,深层土壤总硒含量为（0.07~0.92）×10^-6,平均值为0.44×10^-6,研究区表层和深层土壤分别有62.2%和64.5%属于富硒土壤。表层土壤总硒对深层土壤总硒具有一定的继承性,土壤总硒主要受控于成土母质。相关分析表明,土壤中总硒含量与C、Org C、Al2O3、TFe2O3等呈显著性正相关,说明土壤中有机碳、铁锰氧化物对硒的地球化学行为有重要影响。研究区生态环境质量优良,具有开发富硒农产品的潜力。

Based on geochemical investigation of soil in the study area, the authors studied characteristics of selenium distribution, sources and physical-chemical properties of soil in the Beibu Gulf coastal economic zone of Guangxi. The results show that the total selenium content in surface soil is from 0.06× 10^-6 to 0.90× 10^-6, with the average value of 0.44×10^-6. The total selenium content in deep soil is from 0.07×10^-6 to 0.92×10^-6, with the average value of 0.44× 10^-6. The total selenium content in the surface soil to a certain extent has inherited the selenium from the parent materials. The correlation analysis indicates that the total selenium content in soil has a significant positive correlation with carbon, organic carbon, aluminum oxide and total iron oxide, indicating that organic carbon, iron and manganese oxides in the soil and the weathering and leaching extent play important roles in the geochemical behaviors of selenium. The ecological quality of the study area is excellent with the potential of developing selenium-rich agricultural products.