交通源路域土壤——植物系统中重金属污染研究

Research on Traffic Heavy Metal Contamination of the Soil-Plant System along Roadside

针对交通源路域重金属污染问题,在江苏省内分别选取2条国道和高速公路的4个典型路段进行了土壤-植物系统中铅、铜、锌、镉污染监测,并分析了路域土壤-植物系统重金属污染的现状、特性、相关性及其影响因素。结果表明:江苏省内路域土壤一定程度上受到重金属污染,不同道路路域土壤重金属污染与车流量无明显相关性,植物中铜浓度、镉锌浓度总和与土壤中铜浓度、镉锌浓度总和呈显著正相关,不同公路路域土壤重金属污染受车流量、运营时间、公路类型和气候影响。

Regarding the problems relative to traffic heavy metal pollution along roadside, 4 typical sites in 2 freeway and 2 national highway respectively have been chosen to monitor Pb,Cu ,Zn ,Cd pollutes in soil -plant system. The contaminative state, characteristics, correlation and influnce factors was analyzed. The results indicated that the soil of inner roadside of Jiangsu province was polluted to some extent. Moreover, soil heavy metal contaminative state of different roadside has no ob- vious correlation with traffic counts. The concentration of copper was positive linearity correlativity between soil and plants, and the concentration of cadmium together with zinc was positive linearity correlativity too. The differences of heavy metal concentration are attributed to the effects of traffic intensity, operating time, road type and climate.