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新疆于田縣綠洲區(qū)土壤重金屬空間分布特征與影響因素
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中國(guó)地質(zhì)調(diào)查局中央返還兩權(quán)款資金項(xiàng)目(S15-1-LQ)


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

    以新疆于田縣綠洲區(qū)為研究區(qū),對(duì)1165組表層土壤樣品的重金屬元素含量進(jìn)行測(cè)定。通過(guò)綜合運(yùn)用多元統(tǒng)計(jì)分析、地統(tǒng)計(jì)學(xué)、空間自相關(guān)理論、空間分析和GIS技術(shù)相結(jié)合的方法,對(duì)研究區(qū)土壤重金屬含量和空間分布特征及影響因素進(jìn)行分析。結(jié)果表明:1165組土壤采樣點(diǎn)中,有3個(gè)取樣點(diǎn)超過(guò)風(fēng)險(xiǎn)篩選值,非農(nóng)用地土壤重金屬元素含量均值均低于新疆土壤背景值,農(nóng)用地中Cd、Hg、Cr含量均值大于新疆土壤背景值;Cd、Pb的變異函數(shù)理論模型為指數(shù)模型,Hg、As、Cr、Cu、Ni、Zn的變異函數(shù)理論模型為球狀模型,Cd塊金系數(shù)小于25%,說(shuō)明Cd有較強(qiáng)的空間相關(guān)性,其他元素塊金系數(shù)介于25%~50%之間,有明顯的空間相關(guān)性;土壤重金屬空間自相關(guān)莫蘭指數(shù)均大于0。縣域尺度內(nèi),土壤重金屬具有一定的空間正相關(guān)分布,其空間分布格局總體呈從研究區(qū)中心向四周含量逐漸減小的趨勢(shì)。土壤重金屬元素含量在不同成土母質(zhì)、土壤類型和土地利用類型下呈現(xiàn)的分布特征不同。Hg、As、Pb、Cr、Cu、Ni、Zn具有相同的來(lái)源,其含量還受土壤質(zhì)地的影響。

    Abstract:

    Totally 1165 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.

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陳云飛,曾妍妍,周金龍,王松濤,杜江巖,劉延鋒.新疆于田縣綠洲區(qū)土壤重金屬空間分布特征與影響因素[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2019,50(4):263-273. CHEN Yunfei, ZENG Yanyan, ZHOU Jinlong, WANG Songtao, DU Jiangyan, LIU Yanfeng. Spatial Distribution Characteristics and Influence Factors of Soil Heavy Metal Contents in Oasis Area of Yutian County, Xinjiang[J]. Transactions of the Chinese Society for Agricultural Machinery,2019,50(4):263-273.

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  • 收稿日期:2018-10-29
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  • 在線發(fā)布日期: 2019-04-10
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