Spatial Distribution of Selenium in Cultivated Soil in Xinning County and Analysis of the Influencing Factors
The study investigated the spatial distribution of selenium(Se)in cultivated soil in Xinning County,employing grid distribution,field investigation,sampling,analysis,and GIS spatial analysis.Results indicated a range of Se content from 0.10 to 3.59 mg/kg,averaging 0.57 mg/kg,surpassing the national average.Notably,78.22％of the county's cultivated land exhibited high Se levels,predominantly clustered in three areas within Wantang Township and Anshan Township.Spatial analysis using Moran's I index revealed a moderate spatial correlation(0.280)with a 47.70％nugget effect,suggesting a spatial aggregation influenced by both structured and random factors.Selenium content was notably linked to the parent material,with soils derived from granite weathering showing an elevated average Se content of 0.62 mg/kg.Yellow soil demonstrated the highest Se content(mean:0.68 mg/kg),while purple soil had the lowest(mean:0.42 mg/kg).Correlation analysis established a significant positive relationship(P＜0.01)between Se content and soil organic matter,copper,zinc,and manganese contents as well as cation exchange capacity.Additionally,soil pH demonstrated an intriguing relationship:below 7.5 pH,a significant negative correlation with Se content was observed(P＜0.05),while above 7.5 pH,a positive correlation with Se content was evident.In conclusion,Xinning County boasts abundant Se resources in its cultivated land.Understanding the spatial distribution characteristics of soil Se provides a scientific foundation for fostering Se-rich agricultural products in the region.
seleniumcultivated soilspatial distribution characteristicssoil characteristics
万方数据
维普
