摘要
Contents of 13 trace elements in soils. from 36 locations in Tianjin plain area were determined. Values of Moran's l of the trace element contents in soils of the area were calculated. The spatial autocorrelation, the directional characteristics of autocorrelation,the relationship between autocorrelation and lag of sampling as well as the relationship between autocorrelation in different directions and lag of sampling were investigated. Under the sampling density of 300 km2 per sample, significant positive autocorrelation was detected for most trace elements studied. The most significant autocorrelation was found in horizon A Where the original distribution patterns of the elements have been modified remarkably by natural forces and human activities. The spatial structures of Hg, Cd, Pb, Zn, and As contents in suffoce soil were forther altered by pollution and agricultural practice.
Contents of 13 trace elements in soils. from 36 locations in Tianjin plain area were determined. Values of Moran's l of the trace element contents in soils of the area were calculated. The spatial autocorrelation, the directional characteristics of autocorrelation,the relationship between autocorrelation and lag of sampling as well as the relationship between autocorrelation in different directions and lag of sampling were investigated. Under the sampling density of 300 km2 per sample, significant positive autocorrelation was detected for most trace elements studied. The most significant autocorrelation was found in horizon A Where the original distribution patterns of the elements have been modified remarkably by natural forces and human activities. The spatial structures of Hg, Cd, Pb, Zn, and As contents in suffoce soil were forther altered by pollution and agricultural practice.
