Zhang Sun-Xun, Zhang Shou-Hong, Yan Jing, Wang Ren-Zhong-Yuan, Yang Hang
School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China.
National Station for Forest Ecosystem Research in Jixian County, Jixian 042200, China.
Huan Jing Ke Xue. 2022 Sep 8;43(9):4587-4596. doi: 10.13227/j.hjkx.202112232.
Green roofs are regarded as one of the important measures for the sponge city construction. However, the comprehensive impacts of configuration factors (e.g., vegetation and substrates) on runoff quality from green roofs are not clear, which limits the promotion of green roofs. In this study, 12 green roofs with three vegetation types (i.e., , and non-vegetated substrates), three substrate types (i.e., local planting soil, engineered soil, and light growing medium), and two substrate depths (i.e., 10 cm and 15 cm) were set up in Beijing. During the rainy season of 2019, the rainfall characteristics, runoff volumes, and concentrations of nutrients and heavy metals of runoff from the green roofs were monitored. Based on the measured data, a runoff quality index (RQI) was developed to evaluate the comprehensive influences of configurations on runoff quality of the green roofs. The results showed that vegetation could improve runoff reduction rate and decrease the concentrations of NO-N in runoff of green roofs. The RQIs of green roofs planted with and were similar, and the evaluation results of runoff quality were better than those with non-vegetated substrates. The materials of substrates had significant influences on the runoff reduction rate and pollutant concentrations in runoff from green roofs. The green roofs with light growing medium, which had the lowest runoff reduction rates and the highest concentrations of NH-N, DFe, DMn, and DZn in the runoff, showed poorer runoff quality than the green roofs with local planting soil and engineered soil. The green roofs with a substrate depth of 15 cm had higher runoff reduction rates than those with 10 cm deep substrate, and the runoff quality was better than those with a substrate depth of 10 cm. The results of this study provide scientific reference for the design and integrated assessment of green roofs.
绿色屋顶被视为海绵城市建设的重要措施之一。然而，配置因素（如植被和基质）对绿色屋顶径流质量的综合影响尚不清楚，这限制了绿色屋顶的推广。本研究在北京设置了12个绿色屋顶，包括三种植被类型（即[此处原文缺失具体植被类型]、[此处原文缺失具体植被类型]和无植被基质）、三种基质类型（即当地种植土、工程土和轻质种植基质）以及两种基质深度（即10厘米和15厘米）。在2019年雨季期间，对绿色屋顶的降雨特征、径流量以及径流中养分和重金属的浓度进行了监测。基于实测数据，开发了径流质量指数（RQI）来评估配置对绿色屋顶径流质量的综合影响。结果表明，植被可以提高径流削减率，并降低绿色屋顶径流中NO-N的浓度。种植[此处原文缺失具体植被类型]和[此处原文缺失具体植被类型]的绿色屋顶的RQI相似，径流质量评价结果优于无植被基质的绿色屋顶。基质材料对绿色屋顶径流削减率和径流中污染物浓度有显著影响。轻质种植基质的绿色屋顶径流削减率最低，径流中NH-N、DFe、DMn和DZn的浓度最高，其径流质量比当地种植土和工程土的绿色屋顶差。基质深度为15厘米的绿色屋顶径流削减率高于基质深度为10厘米的绿色屋顶，径流质量也优于基质深度为10厘米的绿色屋顶。本研究结果为绿色屋顶的设计和综合评估提供了科学参考。
