沈阳市加杨(Populus Canadensis)叶铅污染的空间分布

Spatial distribution of Pb pollution of aspen (Populus canadensis) leaves in Shenyang city

实地调查采样、结合GIS技术进行室内综合分析,系统研究了沈阳市加杨叶铅污染的空间分布状况。结果表明,沈阳市加杨(Populus canadensis)叶铅质量分数是0.68～106.767mg·kg-1,平均值是17.416mg·kg-1,是对照点叶铅质量分数的15.18倍,叶铅污染较严重。叶铅质量分数空间分异大,已形成4个高浓度中心。不同功能区加杨叶铅质量分数由大到小的顺序是:工业区,商业区,二类混合区,居民文教区,一类混合区,对照区。与点状污染源距离越远,叶铅质量分数越小。加杨叶铅质量分数和土壤相关性极其显著,这说明沈阳市实行无铅汽油之后,植物叶铅主要来自土壤。

Based on field sampling and indoor analysis using GIS technology, we explored the pollution characteristics of Pb in aspen （Populus canadensis） leaves in Shenyang city, northeastern China. The results showed that the range of total lead content in aspen leaves is 0.68-106.767 mg.kg^-1 with an average value of 17.416 mg.kg^-1, 15.18 times as high as that in control point. It indicated that the aspens in this area were severely polluted. A great difference existed in the spatial distribution of lead in aspen leaves, and four high lead content sites were formed. The leaf Pb content in the functional regions, from high to low, followed the order of industrial district 〉 commercial district 〉 secondary mixed district 〉 residential-culture-education district 〉 first mixed district 〉 reference district. The farther the distance to pollution sources, the lower the lead content in aspen leaves. The correlation between Pb contents in aspen leaves and soil is extremely significant, which implies that lead in plants comes mainly from the soil after the full application of lead-free gas in Shenyang city.