Spatial Variabilities of Heavy Metals and Salt Contents in Soils of Irtysh River Basin
SHI Lei;ZHOU Huarong;WEN Bin;Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences;University of Chinese Academy of Sciences;
With Irtysh River as the study object, the paper analyzes the spatial distribution of heavy metals such as Cu, Zn,As, Pb, and salts based on 0~40 cm surface soil samples at 106 sampling points. The statistical characteristic and structure characteristics of the data were analyzed using statistical and geostatistical methods. With the help of GIS, the spatial distribution characteristics of heavy metals and salt contents are discussed, and the result showed that the contents of heavy metal Cu,Zn, As and Pb are between 17.110~157.540 mg/kg, 56.360~2 032.980 mg/kg, 6.370~19.880 mg/kg, 12.19~131.520 mg/kg respectively. The content of Zn and Pb is far higher than soil element background values of heavy metals in Xinjiang, indicating Zn and Pb are the main pollutants. The block gold coefficient of heavy metal As and Pb are the highest, spatial correlation is weak, and the spatial correlation of Cu and Zn is higher, indicating the combination functions of structural and random variable. Soil salt fits linear model, and pH fits Gaussian model. The spatial distribution of heavy metals is different, the space distribution of Cu and pH, total salt is in a good consistency, with circle shape of the spatial distribution. The distribution of Zn is more at northeast and less at southwest, while As and Pb distribution is more at north and less at south, showing a greater independence and randomness. The research has a certain reference value to risk assessment of heavy metal pollution in Irtysh River basin.
【CateGory Index】： X53