基于分形方法的合肥大兴地区土壤中污染元素Hg异常下限  

Determination of Hg threshold in soil of Daxin in Hefei by fractal method

作　　者：袁峰[1] 张颖慧[1] 周涛发[1] 李湘凌[1] 张鑫[1] 陈兴仁[2] 陈永宁[2] 陈富荣[2] 贾十军[2] 

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009 [2]安徽省地质调查院,安徽合肥230009

出　　处：《生态环境》2008年第6期2259-2263,共5页Ecology and Environmnet

基　　金：安徽省科技攻关计划项目(08010302200);安徽省优秀青年科技基金项目(08040106907,04045063);中国地质调查局项目(2004-012)

摘　　要：土壤污染元素异常下限值的确定对环境地球化学评价具有重要意义,传统异常下限值计算方法仅适用于元素含量数据呈正态分布的情况且地球化学意义不明确,而事实上土壤元素含量的空间分布很可能具有分形分布特征,元素背景和异常有各自独立的幂指数关系。文章探讨利用分形方法确定合肥大兴地区土壤中Hg元素的异常下限值。基于分形的含量-面积方法确定的合肥大兴地区土壤中污染元素Hg的异常下限值为0.13mg/kg。与传统方法(平均值加两倍标准离差)对比显示,分形方法圈定的异常区域是有效的、合理的。It is of great significance to determine the thresholds of pollution elements in soil for geochemical evaluation of environment. The traditional way of determining thresholds is only suitable to the element data suffering normal distribution strictly, and it＇s geochemical signification is not clear. In fact, the distribution of soil elements which is complicated extremely, has the fractal distribution characteristics in all probability. The background and anomaly values of elements usually show independent power index relationship. This paper discusses using fractal method to determine the threshold of rig element in soil of Daxin area in Hefei. Based on the concentration-area fractal method, the threshold of Hg element is 0.13 mg/kg. Compared with the results obtained by traditional methods （ x^- ＋2S）, the anomaly extension obtained by fraetal method is effective and reasonable.

关 键 词：分形 汞 异常下限值 土壤 合肥 

分 类 号：X132[环境科学与工程—环境科学]