科尔沁沙地双辽地区地表基质化学元素垂向分布特征及含量等级OA

This study systematically investigates the vertical distribution characteristics of major,mineral,beneficial,and harmful elements in the top 50 m of borehole SLZK04 in Shuangliao area,Jilin Province.The results reveal that the contents of Al2O3,CaO,MgO,TiO2,P2O5,and Fe2O3 exhibit a negative correlation with SiO2 content,which is closely associated with soil texture.The distribution patterns of mineral elements generally show higher concentrations in oxidizing weathering and transport environments,whereas lower concentrations are found in reducing lacustrine sedimentary conditions.The distribution of beneficial elements is also constrained by sedimentary environments,while harmful elements maintain consistently low levels throughout the borehole.Quality assessment of chemical elements in the whole soil profile indicates that the average CaO content falls into Grade Ⅱ(relatively abundant),MgO into GradeⅣ(relatively deficient),Fe2O3,Mn,and P into Grade V(deficient),K into Grade Ⅲ(moderate),and Se,I,and F into Grade V(deficient).The soil environmental quality is classified as Class Ⅰ(clean).