摘要
研究了环神农架地区主要植烟土壤91个耕层样品8种重金属元素Cr、Ni、Cu、Zn、As、Cd、Pb、Hg的水平,利用单因子和内梅罗污染指数法对该区土壤重金属环境质量状况进行了评价,并探讨了该区土壤重金属的富集特征。研究结果显示:环神农架地区土壤重金属元素含量存在较大变异,以Hg和Pb变异最大,变异系数分别为60.22%和59.78%,Ni元素变异最小,变异系数为17.81%。环神农架地区植烟土壤Cr、Cu、As、Cd、Pb、Hg含量均符合无公害生产产地标准,Ni和Zn元素分别有3个和2个样品超标,综合污染评价显示供试土壤分别有78%和22%处于清洁和尚清洁水平。以湖北省A层(0～20cm)土壤元素背景值为基准的研究结果表明,20世纪90年代以来,环神农架地区8种重金属均存在不同程度富集,而As、Pb、Zn、Cd、Ni富集更为明显。
Eight heavy metals i.e. Cr, Ni, Cu, Zn, As, Cd, Pb, and Hg from 91 topsoil samples in tobacco planting soils in Shennongjia surrounding area were studied. Single factor index and the Nemerow Synthetical Pollution Index Methods were adopted to evaluate environment quality of heavy metals. The accumulation characteristics of heavy metals in this region were also investigated. Results showed that there was a variation in the content of heavy metals in this area. Hg and Pb exhibited the biggest variation with coefficient of variation ranging from 60.22 % to 59.78 %. Variation of Ni was the smallest with a co- efficient variation of 17.81% . Content of Cr,Cu ,As ,Cd,Pb,Hg in tobacco planting soil in this region were conform to the na- tional environmental quality standards for hazard-free agricultural products. There were only 3 and 2 samples which exceeded the allowed figure in Ni and Zn element respectively. Synthetically pollution assessment demonstrated that there were 78 % and 22 % of sampled soils in clean or less clean with a little pollution. Compared with soil element background value in soils of horizon A （0-20 cm） in Hubei province, 8 heavy metals had a various degree of accumulation since the t990s, while accumu- lation of As, Pb, Zn, Cd and Ni were more obviously.
出处
《中国烟草学报》
EI
CAS
CSCD
2009年第1期31-34,共4页
Acta Tabacaria Sinica
基金
湖北省烟草公司环神农架项目(2008BBE001)一部分
关键词
环神农架地区
植烟土壤:重金属评价
富集特征
Areas Surronnding Shennongjia
tobacco planting soil
heavy metals assessment
accumulation characteristics
