广西荔浦市土壤硒分布特征及影响因素OACSTPCD

Based on the geochemical investigation project of land quality in Lipu,Guangxi,the distribution characteristics and influencing factors of selenium in topsoil in the whole city are analyzed and studied.The re-sults show that the total amount of soil selenium in Lipu ranged from 0.10 to 1.09 mg/kg,with an average value of 0.44 mg/kg,which is higher than the average content of soil selenium in China.The area of selenium rich soil is accounted for 63.57%of the total area of the city.In the soil forming parent material,the total selenium content is the highest in the siliceous rock parent material developed soil of Carboniferous Luzhai Formation,with an average value of 0.673 mg/kg.Among the soil types,the total selenium content of red soil is the high-est,with an average value of 0.643 mg/kg,and that of proluvial soil is the lowest,with an average value of 0.283 mg/kg.Different land-use types have certain effects on soil selenium content.The total selenium content of forest land is the highest,with an average value of 0.613 mg/kg,and that of paddy field is the lowest,with an average value of 0.391 mg/kg.In addition,there are negative and positive correlations between soil pH val-ue,organic matter and selenium content,which control the distribution characteristics of soil selenium content to a great extent.