广西金秀县头排—桐木地区富硒土壤地球化学特征及生态效应研究

Study on geochemical characteristics and ecological effect ofselenium-rich soil in Toupai-Tongmu area of Jinxiu County,Guangxi

基于广西金秀县头排—桐木地区土地质量地球化学调查数据资料,研究了表层土壤中硒含量的分布特征、受控因素、富硒农产品产出情况。研究表明:该地区土壤硒平均含量为0.6 mg/kg,土壤硒含量>0.4 mg/kg的富硒土壤面积占研究区的72.8%;土壤硒含量受成土母质、土壤pH值、有机质等土壤性质的影响;农产品水稻、玉米和花生富硒率较高,水稻硒含量与根系土中全硒、pH值、有机碳以及铁含量呈正相关关系,说明这些指标对土壤-农作物系统中硒元素的地球化学行为具有明显的影响。

The distribution characteristics and impact factors of Se element in surface soils as well as its ecological effects on agricultural products are studied on the basis of the geochemical data of land quality survey in Toupai-Tongmu area of Jinxiu County,Guangxi.The study result shows that the average content of selenium in the soils of Toupai-Tongmu area,Jinxiu County is 0.6 mg/kg,and the area with selenium-rich soils(>0.4 mg/kg)accounts for 72.8%of the whole study region.Selenium content in soils is affected by soil parent material,soil properties including soil pH value and organic materials.Selenium contents in rice,corn and peanut are relatively higher.The selenium content in rice is positively correlated with total selenium content,pH value,organic carbon and iron content in root soils.It is indicated that these indexes have a significant influence on the geochemical behavior of selenium element in soil-crop system.