摘要
在喀斯特边远农区典型植烟县采取代表性植烟土壤样品66个,研究县级尺度下植烟土壤重金属含量及其特征。结果表明,Pb,Hg,C r 3种重金属含量全部符合国家土壤环境质量二级标准,A s含量符合国家土壤环境质量二级标准的样点数高达98.5%,4种重金属环境状况良好,无污染。Cd含量符合国家土壤环境质量二级标准样点数占69.7%,且有10.1%的样点含量高于国家土壤环境质量三级标准,部分植烟土壤已受到染污。3种不同植烟土壤类型重金属含量差异较大,石灰土Cd,Hg,A s平均含量最高(分别为0.51 m g/kg,0.173 m g/kg,15.45m g/kg),水稻土Pb,C r平均含量最高(分别为66.13 m g/kg,55.63 m g/kg),黄壤居于中间水平。土壤重金属含量与土壤质地密切相关,与土壤粒径具有一定的相关性,粘粒与镉、砷极显著正相关(r=0.333**,r=0.345**),与汞显著正相关(r=0.289*),砂粒与汞、砷显著负相关(r=-0.286*,r=-0.245*)。喀斯特边远农区植烟土壤重金属环境状况总体良好,但应重视Cd的控制管理。
The 66 representative samples with tobacco-growing soils was collected in typical tobacco-producing county in Karst remote agricultural areas in order to study the contents and characteristics of heavy metals with tobacco-growing soils under county scale. The results showed that all the contents of Pb, Hg and Cr accorded with Grade Ⅱ , National Soil Environmental Standard, the sample numbers of As content which accorded with the Grade Ⅱ accounted for 98.5% of the total. The standard of the four metals contents was less than polluted standard. The sample numbers of Cd content, which accorded with the Grade Ⅱ accounted for 69.7 %, and the numbers more than the Grade Ⅱ , National Soil Environmental Standard accounting for 10. 1 % , and so the part of tobacco-growing soils was polluted by Cd. The difference between contents of heavy metals with 3 different types of tobacco growing soils was bigger, the lime soil was the highest in the mean contents of Cd, Hg, As with 0. 51 mg/kg, 0. 173 mg/kg, 15.45 mg/kg respectively, and the paddy soil highest in the mean contents of Pb,Cr with 66.13 mg/kg, 55.63 mg/kg respectively, and the yellow soils was in the middle in the metal. The contents of heavy metals with tobacco-growing soils was closely correlated with soil texture and soil particle diameter. The clay had positively significant correlation with Cd, As, Hg （r = 0. 333^＊＊ , r = 0. 345^＊＊ , r = 0. 289^＊ ）, and the sand had negatively significant correlation with Hg, As （r =- 0. 286^＊ ,r = 0. 245^＊ ）. The environmental condition of heavy metals with tobacco-growing soils in remote Karst agricultural area was sound, but the control and management of Cd should be emphasized.
出处
《水土保持学报》
CSCD
北大核心
2007年第1期72-75,98,共5页
Journal of Soil and Water Conservation
基金
国家烟草专卖局攻关项目(110200001011)
贵州省烟草专卖局攻关项目(04-04)
关键词
边远农区
植烟土壤
重金属
remote agricultural area
tobacco-growing soils
heavy metals
