期刊文献+

北京市大兴区土壤重金属含量的空间分布特征 预览 被引量:154

Spatial distribution of concentrations of soil heavy metals in Daxing county, Beijing
在线阅读 下载PDF
分享 导出
摘要 在面积为1039 km2的北京市大兴区布设了70个取样点,测定了其表层土壤重金属Cu、Zn、Pb、Cr、Cd、Ni、As、Se、Hg和Co的含量统计结果表明,除As和Se外,其它重金属平均含量均高于其背景含量.只有个别地方Cd的含量超过了国家二级标准限值,而其余重金属含量均没有超过其二级标准.通过半方差函数分析,发现10种重金属元素在一定范围内均存在空间相关性.采用kriging最优内插法得到了表层土壤重金属含量的空间分布图,发现土壤重金属含量与土壤质地和有机质含量关系密切.目前大兴区土壤重金属的主要来源是污灌,特别是来自凉水河、新凤河和凤河的污水,应重点对这些河流周围的排污企业进行治理,严格执行达标排放. Seventy surface soil samples were collected from an area of 1039?km~2 in Daxing county of Beijing and analyzed for concentrations of Cu,Zn,Pb,Cr,Cd,Ni,As,Se,Hg and Co. The results of statistical analysis indicated that the concentrations of soil heavy metals all exceeded their background levels, except for As and Se. Only Cd concentration exceeded the critical value of national soil quality standard in some regions. The result of semivariance analysis showed that the metal concentrations were correlated in a given spatial range. Kriging method was applied to estimate the unobserved points and their distribution maps were obtained, which indicated that the soil heavy metal concentrations had a close relationship with soil texture and organic matter contents. The accumulation of soil heavy metals in Daxing county was mainly due to irrigation with water from Liangshuihe, Xinfenghe and Fenghe rivers that have been contaminated with wastewater and sewage. Therefore, some effective countermeasures should be adopted to control wastewater discharge from some factories along those rivers and the discharge should fully meet the national standards.
作者 胡克林 张凤荣 吕贻忠 王茹 徐艳 HU Kelin,ZHANG Fengrong,L Yizhong,WANG Ru,XU Yan\ (College of Resources and Environmental Sciences, China Agricultural University, Beijing100094)
出处 《环境科学学报》 CAS 北大核心 2004年第3期 463-468,共6页 Acta Scientiae Circumstantiae
基金 国家自然科学基金,国家重点基础研究发展计划(973计划)
关键词 北京 土壤 重金属 环境质量 环境污染 地质统计学 soil heavy metal semivariance spatial variability
  • 相关文献

参考文献15

二级参考文献37

共引文献780

同被引文献2687

引证文献154

二级引证文献1979

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部 意见反馈