大巴山区土壤中硒、氟的地球化学特征  

The geochemical characteristics of selenium and fluorine in soils of Daba Mountains

作　　者：王五一[1] 李永华[1] 雒昆利[1] 杨林生[1] 

机构地区：[1]中国科学院地理科学与资源研究所,北京100101

出　　处：《地理研究》2003年第2期177-184,共8页Geographical Research

基　　金：国家自然科学基金项目 (40 1710 0 6) ;中国科学院地理科学与资源研究所创新项目 (CXIOG A0 2 0 5 )

摘　　要：以大巴山区典型土壤为对象 ,研究了大巴山区土壤中硒、氟等生命元素的含量、分布及影响因素。结果表明 :大巴山土壤中硒、氟的背景值高 ,其含量远高于全国土壤背景值 ;硒、氟在土壤剖面上的分布存在空间差异 ,总体趋势是硒在表土层聚集 ,氟在心土层淀积 ;土壤中硒、氟的含量受土壤母质的控制 ,同时 ,表生地球化学作用。Se and F are important life elements closely related to health Toxicity or deficiency diseases in plants, animals and human bodies may arise from the abnormal distribution of Se and F in the natural environment In addition, serious pollution effects caused by rapid industrialization and urbanization also create uneven distribution of Se and F, threatening the health of all living organisms Scientists of related disciplines have, in recent years, faced these issues and been involved in studying such relationships Daba Mountains, one of the most poverty stricken areas of China, is also an area with high occurrence of coal burning fluorosis Moreover, its environmental enrichment of Se has produced new problems concerning potential toxicity effects and threats to human health In this work, typical soil profiles in Daba Mountains are selected as our investigative objects, the concentrations and distributions of Se and F in soils are studied The results are shown as follows: The mean concentrations of Se and F in soils of Daba Mountains are 5 70±13 31 μg/g and 622±434 μg/g, respectively, and those values are far higher than their background values in soils of whole China; distributions of Se and F in soil profiles are not the same In general, Se is enriched in surface soil layer, whereas F is enriched in subsoil layer;Se and F concentrations in soils are mainly governed by their concentrations in soil parent The correlation between the two variables can be expressed as Y Se =1 266X Se -0 547(r=0 995, P<0 01), Y F =0 340X F +258 25(r=0 762, P<0 05), respectively, where Y is the Se or F concentrations in soil, and X is the Se or F concentrations in the soil parent Otherwise, environmental geochemical processes, biologic processes and human actions can also profoundly impact the concentrations and redistributions of Se and F in soils

关 键 词：硒 氟 土壤 大巴山区 地球化学 生物作用 人类活动 

分 类 号：P595[天文地球—地球化学]