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Spatial Distribution and Changes of Heavy Metals of Agricultural Lands in Typical Pregrading Coast in Dongtai City,Jiangsu Province,China

查看全文 作　　者：LIAO [1,2]Fuqiang;ZHOU [1]Shenglu;ZHANG [1]Hongfu;WU [1]Shaohua;ZHAO [3]Qiguo 高影响力作者 机构地区：[1]School of Geography and Ocean Science, Nanjing University, Nanjing 210093, China,;[2]School of Geography and Environment, Jiangxi Normal University, Nanchang 330022, China;;[3]Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China高影响力机构 出　　处：《Chinese Geographical Science》索引2008年第18卷第3期,共8页高影响力期刊 基　　金：Under the auspices of State Key Development Program for Basic Research of China (No 2002CB410810) 摘　　要：According to the historical changes of coastal lines, seven soil sampling districts, from land to sea, were arranged in Dongtai City, Jiangsu Province to sample soils from surface and profile. Concentrations of seven major heavy metals (HMs), granularity, pH, organic matters and C/N of the soil samples were analyzed. Results show that concentrations of heavy metals in agricultural land present a certain spatial variance, decreasing from land to sea. Pollution assessment indicates that the agricultural soils were not polluted by HMs, but the potential pollution of Cu and Hg needs to be alerted. Different HMs accumulate in the surface and sub-surface of the soil profiles, and concentrations of Hg and Pb decrease significantly with the increment of soil depth. Concentrations of HMs exhibit a significantly negative correlation to pH, but have no significant relation with organic matters in soil. Principle component analysis show that the concentrations of HMs relate to the land use history. Concentrations of Hg, Ni and Cr in soil are closely related with land use history, and concentrations of Pb, Cu and Cr are affected by land use history as well as other factors. However, there is no significant relation between concentration of As and land use history. 关 键 词：海岸带 重金属 江苏 农田 土地利用记录
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