Accumulation and relationship of metals in different soil aggregate fractions along soil profiles  

作　　者：Qian Shen Mengjie Wu Mingkui Zhang 

机构地区：[1]Zhejiang Provincial Key Laboratory of Subtropical Soil and Plant Nutrition,College of Environmental&Resource Sciences,Zhejiang University,Hangzhou 310058,China

出　　处：《Journal of Environmental Sciences》2022年第5期47-54,共8页环境科学学报（英文版）

基　　金：This work was supported by the National Key Research and Development Project of China(No.2017YFD0800305).

摘　　要：Different aggregates vary in their ability to retain or adsorb metals in soil.Five soil profiles were sampled from different soil horizons and grouped,and the concentrations of Al,Mg,Ca,Fe,Mn,Cd,Cu and Pb were determined in six sizes of aggregates(>2,2-1,1-0.6,0.6-0.25,0.25-0.053,<0.053 mm).Significantly high(p<0.05)structural stability indexes(SSI)and ag-gregate stability indexes(ASI)were recorded in the topsoil horizon,which may be attributed to the high soil organic matter(SOM)content in aggregates from topsoil.In addition,ASI and SSI were positively correlated(r=0.569,p<0.05)with each other,which indicated that the stability of soil aggregates could contribute to the structural stability of bulk soil.Moreover,accumulation factors(AF),principal component analysis(PCA)and Pearson's correlation co-efficients were used for metal element assessment.The results indicated that SOM was not a key factor affecting the accumulation of Ca,Mg,Al,Fe,Mn,Pb,Cd and Cu in soil aggre-gates.In general,AF values for metal elements in microaggregates(<0.25 mm)were high,which showed that metals preferred to accumulate in fine soil aggregates.The PCA and Pearson's correlation coefficients indicated that soil parent materials primarily controlled the distribution of Al,Ca,Fe,Mg and Mn,while materials derived from technogenic sources have important impacts on the distribution of Cd,Cu and Pb in soil aggregates along the soil profile.

关 键 词：Soil profile AGGREGATE Structural stability index(SSI) Aggregate stability index(ASI) METALS Accumulation factor(AF) 

分 类 号：X53[环境科学与工程—环境工程]