基于城乡环境梯度的土壤重金属富集机制及源解析研究-以广州市为例

项目名称： 基于城乡环境梯度的土壤重金属富集机制及源解析研究-以广州市为例

项目编号： No.41201540

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 地理学

项目作者： 谢志宜

作者单位： 广东省环境监测中心

项目金额： 25万元

中文摘要： 城乡环境梯度演化带是不同时期城市化进程的结果，也记录着自然-农耕-工业化时代，人类活动逐渐增强的过程，同时也导致了人为排放的重金属元素在土壤中不同程度的富集。如何从该演进过程中，揭示土壤重金属元素的富集机制，探寻其物质来源，是本项目研究的核心科学问题。本项目拟以广州市为例，开展以中心城区-建成区-近郊区-远郊区-农村为城乡环境梯度的土壤重金属元素含量的空间变异分析，结合不同城乡环境梯度演进时期土壤剖面对比研究，利用地球化学和相关地统计学理论，探讨研究区土壤重金属元素的人为来源和自然富集机制，在此基础上，对典型土壤剖面开展Pb同位素分析，进一步追溯人为来源和自然富集的具体途径。本项目的开展有助于拓展土壤环境演化的时空研究尺度，并为研究区土壤环境质量和生态健康评价提供理论依据，同时也为我国城乡进程中按环境梯度进行土壤重金属元素污染分层次修复、治理提供科学依据。

中文关键词： 城乡梯度；重金属；Pb同位素；富集机制；源解析

英文摘要： The evolution of urban-rural environmental gradient zone is the result from the process of urbanization in different period.The former also has the records of gradually enhanced human activities from nature to farming, to industrialization era and at the same time leads to the accumulation of anthropogenicheavy metal element in soil to varying degrees. How to reveal these enrichment mechanism and identify the heavy metal sources from the evolution process is the core scientific issues discussed in this program.Taking Guangzhou, a megacity in south China as an example, the specific methods to investigate the human source and enrichment mechanism of the heavy metalin soils includes spatial variability analysis of heavy metal contents in soils between city center-built-surburb-outer surburd-rural areas and soil profile comparision between different evolution period in urban-rural gradient zone, as well as Geochemistry and Geo-statistics theory. Based on these methods, a futher Pb isotope analysis is undertook for typical soil profile to investigate the definiteapproaches of human sources and natural enrichments. The program is helpful to expand the spatiotemporal scales of soil environmental evolution, and provides scientific evidence for evaluation of soil environmental quality and ecosystem health in study area,

英文关键词： the urban-rural gradient zone；heavy metals；Pb isotope；enrichment mechanism；source apportionment