| 绿色、蓝色和蓝-绿屋顶径流水质特征 |
| 摘要点击 2933 全文点击 2678 投稿时间：2022-03-22 修订日期：2022-04-24 |
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| 中文关键词 绿色屋顶|蓝色屋顶|蓝-绿屋顶|径流水质|营养盐|重金属 |
| 英文关键词 green roof|blue roof|blue-green roof|runoff quality|nutrients|heavy metals |
| 作者 | 单位 | E-mail | | 章孙逊 | 北京林业大学水土保持学院, 北京 100083 | zhangsx2018@bjfu.edu.cn | | 张守红 | 北京林业大学水土保持学院, 北京 100083
山西吉县森林生态系统国家野外科学观测研究站, 临汾 042200
北京市水土保持工程技术研究中心, 北京 100083 | zhangs@bjfu.edu.cn | | 闫婧 | 北京林业大学水土保持学院, 北京 100083 | | | 王恺 | 北京林业大学水土保持学院, 北京 100083 | | | 杨航 | 北京林业大学水土保持学院, 北京 100083 | | | 王任重远 | 北京林业大学水土保持学院, 北京 100083 | | | 张文龙 | 北京林业大学水土保持学院, 北京 100083 | | | 李华林 | 北京林业大学水土保持学院, 北京 100083 | |
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| 中文摘要 |
| 屋顶占据大量城市不透水面,实施生态屋顶建设,有利于缓解城市化造成的生态和环境问题.在北京市区搭建不同类型生态屋顶(绿色屋顶、蓝色屋顶和蓝-绿屋顶),基于对2019年雨季降雨特征、各类生态屋顶径流量以及径流中营养盐和重金属浓度的监测,计算不同生态屋顶径流污染负荷和径流水质指数(RQI),定量对比分析不同类型生态屋顶径流的综合水质差异.结果表明,在2019年雨季,各生态屋顶均表现出良好的雨水滞留能力,平均径流削减率在75.7%~78.9%之间,且不同生态屋顶的径流削减率无显著差异(P>0.05);相较雨水,各生态屋顶均为NH+4-N、DZn和DCd的汇,累积负荷削减率分别在63.8%~96.4%、68.6%~90.7%和39.8%~54.5%之间,但均为NO-3-N、DCr、DFe和DNi的释放源;蓝色屋顶是DCu的汇(累积负荷削减率为21.9%),但对雨水径流中PO3-4-P的累积负荷无明显影响,而绿色和蓝-绿屋顶均为PO3-4-P和DCu的释放源;蓝色屋顶的RQI最高,蓝-绿屋顶次之,绿色屋顶的RQI显著低于蓝色和蓝-绿屋顶(P<0.05).这表明蓝色屋顶水质最佳,为绿色屋顶增加蓄水层可显著改善径流水质.研究结果可为生态屋顶设施选择和设计提供科学依据. |
| 英文摘要 |
| Roofs occupy a great proportion of urban impervious surfaces, and the implementation of eco-roof construction in urban areas is beneficial to alleviate the ecological and environmental problems caused by rapid urbanization. In this study, different eco-roofs (i.e., 68.6%-90.7%, and 39.8%-54.5%, respectively. However, all the eco-roofs were sources of NO-3-N, DCr, DFe, and DNi. The blue roof was a sink of DCu (with a pollutant load reduction rate of 21.9%) and did not affect the cumulative load of PO3-4-P in runoff. However, the green roof and blue-green roof were the sources of PO3-4-P and DCu. The RQI value of the blue roof was the highest, followed by that of the blue-green roof and green roof. The RQI value of the green roof was significantly lower than that of the blue and blue-green roofs (P<0.05). These results indicated that the runoff quality of the blue roof was the best, whereas that of the green roof was the worst. Adding a storage layer to the green roofs could significantly improve the runoff quality. The results of this study provide scientific references for the selection and design of eco-roof facilities. |
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