Spatial Distribution Characteristics of Selenium Content in Soils and its Influence Factors in Xuwen,Guangdong
This study investigated the spatial distribution of selenium content and its influencing factors in the topsoil of 113 agricultural land samples collected from Xuwen County,Guangdong.The results indicated that selenium content in cultivated soils in the region ranged from 0.04 to 0.82 mg/kg,with an average of 0.32 mg/kg.The highest average selenium level was observed in the dark yellow brown soil(0.41 mg/kg).Geographically,the average selenium content in the southern areas,including Nanshan Town,Xucheng Street,and Chengbei Township(0.51,0.41,and 0.42 mg/kg),was notably higher than in other townships.The content of selenium in soils of different parent material types varied,with coastal alluvial soil having the highest average selenium content(0.35 mg/kg),followed by cultivated land developed from basalt(0.30 mg/kg).Comprehensive analysis suggested that soil type and parent material may be important factors influencing selenium content distribution.
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