Characteristics and Influencing Factors of Selenium(Se)in Red Soils Derived from Typical Parent Materials in Southern China
In order to understand Se characteristics and their influence physicochemical properties of red soils derived from different parent materials in southern China,soil samples were collected from the typical red soils of Guangxi,the contents of total Se,available Se and different Se forms were determined,and their influence factors were explored through the AMOS path analysis model and soil culture experiment.The results showed that soil total Se content was higher than 0.4 mg/kg,which was the highest in red soil derived from granite,while available Se content was the highest and with the largest variation in red soil derived from sand shale.Se was mainly in forms of Se bound to organic matter and residual Se,and the contents of different Se forms from high to low were as follows:residual Se>Se bound to organic matter>Se bound to iron and manganese oxides>exchangeable Se>soluble Se.The results of AMOS path analysis showed soil total phosphorus,organic matter and pH contributed more to the distribution of Se forms.The influences of total nitrogen in red soil derived from quaternary red clays and available nitrogen in red soil derived from sand shale were also noteworthy.Soil culture experiment conducted with the physicochemical factors of greater contribution showed that,after the addition of exogenous physicochemical factors,the maximum soil available Se content appeared at a certain time and concentration conditions,and the optimal factors obtained were different for red soils derived from different parent materials.In conclusion,the differences in physiochemical properties lead to the great differences in the characteristics of Se forms in red soils derived from different parent materials,and the addition of different physiochemical factors result in the redistribution of Se forms due to the changes in soil environment.
Red soil in southern ChinaDifferent parent soilSoil seleniumAvailable seleniumSelenium form
万方数据
维普
