徐州市顺堤河两岸植物群落地表径流污染物含量时空变化研究

Spatial and Temporal Variation of Surface Runoff Pollutants in Plant Communities Along the Shundi River in Xuzhou City

为了解城市绿地植物群落地表径流中各种污染物的变化,收集了徐州市云龙区顺堤河绿地内9个植物群落样本及在连续5 a每年12场降雨的地表径流情况,并按照国家环保局“水和废水监测分析方法”分析了其污染物含量变化.结果表明:地表径流中Zn等8种污染物含量最低值主要出现在每年的6、7、8月,最高值多数出现在12月份,其次是1月份,与当地雨季和旱季的出现节律、空气质量的变化节律等基本一致;植物群落组成和结构等特征对地表径流污染物含量影响显著,不同群落地表径流中8种污染物含量差异显著(P均小于0.05);虽然同一年度不同月份间,群落内8种污染物含量差异显著,但不同年度间的差异不显著;8种污染物相互间及与降雨间隔间显著正相关,与降雨量、降雨历时显著负相关,与月平均空气质量显著正相关程度大于与采样当日空气质量.

In order to understand the changes of various pollutants in the surface runoff of urban green plant communities,the surface runoff of 12 rainfall per year for 5 consecutive years was collected in the 9 plant communities in Shundi River green land in Yunlong District of Xuzhou City.Their pollutant content changes were analyzed in accordance with the"Monitoring and Analysis Method of Water and Wastewater"adopted by the National Environmental Protection Bureau.The results show that the lowest values of Zn and other eight pollutants in surface runoff mainly appear in June,July and August every year,and the highest values mostly appear in December,followed by January,which is basically consistent with the rhythm of local rainy and dry seasons and the rhythm of air quality change.The characteristics of plant community composition and structure have a significant impact on the pollutant content of surface runoff,and the contents of 8 pollutants in surface runoff of different communities are significantly different(P<0.05).Although the content of eight pollutants within the community varies significantly between different months of the same year,the differences between different years are not significant.The 8 pollutants are significantly positively correlated with each other and with the rainfall interval,negatively correlated with the rainfall and the duration of rainfall,and significantly positively correlated with the monthly average air quality than with the air quality on the sampling day.