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现代地质 ›› 2014, Vol. 28 ›› Issue (5): 935-941.

• 地球化学 • 上一篇    下一篇

北京城区24年来土壤Hg元素时空变异特征

黄勇1,杨忠芳2,冯辉1,孙朝1   

  1. (1.北京市地质勘察技术院,北京102218;2.中国地质大学(北京)地球科学与资源学院,北京100083)
  • 出版日期:2014-10-25 发布日期:2014-12-29
  • 作者简介:黄勇,男,工程师,硕士,1980年出生,地球化学专业,从事环境地球化学研究工作。 Email:huangyongxyz@163.com。
  • 基金资助:

    北京市政府公益性项目“北京城区土壤地球化学元素时空变化特征研究”(dkjdzky2013009)。

7Characteristics of Spatio-temporal Variability of Soil Mercury in Beijing Urban for 24 Years

HUANG Yong1,YANG Zhong-fang2,FENG Hui1,SUN Zhao1   

  1. (1.Beijing Institute of Geo-exploration Technology, Beijing102218, China; 2.School of Earth Sciences and Resources, China University of Geosciences, Beijing100083, China)
  • Online:2014-10-25 Published:2014-12-29

摘要:

采用地统计学和GIS相结合的方法,研究了北京城区24年来2个阶段(1987—2005年,2005—2011年)土壤汞含量的时空变化特征。结果表明,随着能源消费结构的变化,研究区不同时期土壤汞含量发生了明显的变化,随着时间的推移呈现下降的趋势。1987—2005年,由于工厂搬迁、煤改气等措施的大力实施,土壤汞含量呈现明显的下降,从1.291 μg/g减少到0.556 μg/g。而2005—2011年,土壤汞含量变化并不显著,从0.556 μg/g减少到0.490 μg/g。空间上,从1987年至今,研究区二环内土壤汞含量高值区的范围在不断缩小。从1987年到2005年,二环内土壤汞贫化明显,土壤Hg含量下降了1 μg/g以上,Ⅲ级和超Ⅲ级区域面积从142.22 km2,经过18年后减小到53.59 km2。相对于2005年,2011年研究区只有二环内中北部和西南三环区域土壤汞贫化相对较明显,土壤Hg含量下降了0.3 μg/g以上,Ⅲ级和超Ⅲ级区域面积经过6年后减小到40.51 km2

关键词: 北京城区, 土壤Hg元素, 时空变异

Abstract:

Temporal and spatial variability characteristics of soil mercury content in Beijing urban for 24 year interval (1987—2011) were evaluated using geostatistics and geographic information system(GIS). Results indicate that there is remarkable change that soil mercury content presents obvious decline along with temporal process because of the Energy Consumption Structure’s change of Beijing City. From 1987 to 2005, soil mercury content decreased markedly in the study area mainly because of energetically implementing the measure of factory relocation and Coal to Gas. The average content of soil mercury decreased from 1.291 μg/g to 0.556 μg/g. But there is slight change that soil mercury content decreased from 0.556 μg/g to 0.490 μg/g in the period of 2005—2011. The range of high value area of soil mercury content is reducing within the second ring road of Beijing from 1987 to this day. From 1987 to 2005, soil mercury within the second ring road showed visible depletion that soil mercury content decreased by more than 1 μg/g. After 18 years the area of Grade Ⅲ and over Grade Ⅲ standard diminished from 142.22 square kilometers to 53.59 square kilometers. Compared with 2005, only soil mercury in the area of north-central part within the second ring road and southwest within the third ring road has relatively significant depletion in 2011 that soil mercury content decreased by more than 0.3 μg/g. The area of Grade Ⅲ and over Grade Ⅲ standard has diminished to 40.51 square kilometers after 6 years.

Key words: Beijing urban, soil mercury content, spatio-temporal variability

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