Elemental geochemical characteristics and genetic mechanisms of Se-rich soils in the Lixiahe area in Jiangsu Province
Based on relevant eco-geochemical survey data collected fromthe Lixiahe plain area in Jiangsu Province,this study systemati-cally explored the geochemical characteristics of elements in Se-rich soils and the genetic mechanism through elemental distribution con-trast,correlation analysis,R-type cluster analysis,and principal component analysis.This study can be referenced for the rational pro-duction and utilization of Se-rich land resources of the Quaternary sedimentary type.Key findings are as follows:(1)Se-rich soilsin the Lixiahe area are typical Quaternary sediments,and the closed lagoon facies sedimentary environment characterized by rich organic mat-ter and slightly reducing conditions plays a foundational role in the formation of local Se-rich soils;(2)Typical element association,Se-OM-N-K-Fe-Co,in Se-rich soils is primarily located within a depth of 30 cm from the surface,with Se content ranging mostly from 0.3 ×10-6 to 0.4×10-6 in a uniform distribution;(3)Significant positive correlations between Se and some other elements can be observed in the soils,with the correlation coefficients(r)between Se and OM,and Se and CEC being 0.74 and 0.66,respectively.In contrast,Se exhibits a significant negative correlation with pH,with a correlation coefficient of-0.35;(4)The formation of Se-rich soilsmight have experienced three Se enrichment stages:the initial enrichment in soil parent materials,the re-enrichment during soil formation,and the supergene enrichment after soil formation,accompanied by interference from non-lagoon facies sediments(such as marine sedi-ments).Organic matter adsorption,colloid adsorption,and biogeochemistry constitute the main causes of Se enrichment in the soils;(5)The Se-rich soils are also relatively enriched in heavy metal elements like Cu,Pb,Zn,Ni,Co,and V,which are within the na-tional limit standards.
Se-rich soilelementgeochemical characteristicsgeneticmechanismLixiahe areaJiangsu Province
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