Spatial Distribution Characteristics and Influence Factors of Soil Heavy Metal Contents in Oasis Area of Yutian County, Xinjiang

被引：0
|
作者：
Chen Y. [1 ,2 ]
Zeng Y. [1 ,2 ]
Zhou J. [1 ,2 ]
Wang S. [3 ]
Du J. [3 ]
Liu Y. [4 ]
机构：
[1] College of Water Conservancy and Civil Engineering, Xinjiang Agricultural University, Urumqi
[2] Xinjiang Hydrology and Water Resources Engineering Research Center, Urumqi
[3] No. 2 Hydrogeology and Engineering Geology Party, Xinjiang Bureau of Geology and Mineral Resources Exploration and Development, Changji
[4] School of Environmental Studies, China University of Geosciences, Wuhan
来源：
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | 2019年 / 50卷 / 04期
关键词：
Autocorrelation; Soil heavy metals; Spatial distribution characteristics; Variogram; Yutian County; Xinjiang;
D O I：
10.6041/j.issn.1000-1298.2019.04.030
中图分类号：
学科分类号：
摘要：
Totally 1 165 surface soil samples for heavy metal analysis were collected in oasis area of Yutian County, Xinjiang. Spatial distribution and influence factors of heavy metal elements in soils in the study area were analyzed by means of multivariate statistical analysis, geostatistics, spatial autocorrelation, spatial analysis and GIS technology. Results showed that among 1 165 soil samples, three of which had As contents greater than the risk screening values. Average contents of heavy metal elements in non-agricultural lands were lower than that of soil background values in Xinjiang. Average values of Cd, Hg and Cr contents in agricultural land were greater than that of soil background values in Xinjiang. The theoretical models for variation function of Cd and PB were exponential model, while the theoretical models for variation function of Hg, As, Cr, Cu, Ni and Zn were spherical model. Nugget value of Cd was less than 25%, indicated a relatively strong spatial correlation. Nugget value of other elements ranged between 25% and 50%, indicated significant spatial correlations. As for soil heavy metals, the Moran's I indexes of spatial autocorrelation were greater than 0. There was a positive spatial correlation distribution of soil heavy metal elements in the county scale. And the spatial distribution of soil heavy metal contents in oasis area of Yutian County showed a general decreasing trend from the center of the study area to surrounding areas. Distribution of soil heavy metal contents in the Yutian County varied in different parent materials, soil types and land use patterns. Hg, As, Pb, Cr, Cu, Ni and Zn in soils derived from the same source. However, the contents were affected by soil texture as well. © 2019, Chinese Society of Agricultural Machinery. All right reserved.
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页码：263 / 273
页数：10
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