广州市城市林地土壤重金属污染研究

Study on Urban Forest Soil Heavy Metal Pollutions in Guangzhou

为研究广东省广州市土壤重金属污染,以广州市林业重点工程项目为主要调查范围,对土壤中的重金属元素Cd、Cr、Pb、Ni、Cu、Zn、Hg、As的含量进行测定和分析。结果表明,广州市城市土壤中Hg污染严重,部分地区达到了三级污染,其中临江大道的污染值最高,达到了1.15 mg/kg。其次为Pb、Cu、Zn和As,都存在不同范围的二级污染,南沙工业园区的Cu、Zn污染严重,含量分别达到了41.35 mg/kg和123.58 mg/kg;As污染在城区道路中比较严重,平均含量达到18.64 mg/kg,As含量最高的是白云大道(34.0 mg/kg),接近三级污染;Pb在整个广州市土壤中的含量都达到了二级污染程度,范围很广,其中城区道路、南沙工业园区和机场高速污染较为严重,森林公园和新农村建设的公园中污染比较轻微。

To study the heavy metal pollutions in urban soil in Guangzhou, we have done the main investigation of forestry key engineering projects in Guangzhou, and made soil sampling investigation and analysis on the contents of soil heavy metal, including Cd, Cr, Pb, Zn, Cu, Ni, Hg and As. Result are as follows ： Hg concentration in some plots exceeded the level 3 value of national soil quality standard, the highest value is 1.15 mg/kg in Linjiang avenue. Cu, Zn, Pb and As concentration exceeded the level 2 value of national soil quality standard. Cu and Zn concentration in Nansha industrial park reaches 41.35 mg/kg and 123.58 mg/kg, respectively. As pollution is serious in urban roads, the average content of As was 18.64 mg/kg, the highest value is 34.0 mg/kg in Baiyun avenue which is close to the level 3 value of national soil quality standard. Pb content in all plots reached the level 2 value of national soil quality standard, with higher values in urban roads, Nansha industrial park and Airport expressway, and lower values in Forest park and New rural construction of parks.