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Green roofs: Effects of plant species used on runoff
Land Degradation & Development ( IF 4.7 ) Pub Date : 2018-08-02 , DOI: 10.1002/ldr.3102
XiaoXiao Li 1 , JunJun Cao 1 , PeiXian Xu 2 , Ling Fei 1 , Qin Dong 1 , ZhaoLong Wang 1
Affiliation  

Green roofs are becoming a major nature‐based solution worldwide to reduce urban stormwater runoff. Runoff reduction and retention mainly depend on the hydrological characteristics of substrates and the water use strategies of plants. However, little is known about how plant species affect the hydrological performance of green roofs. Two commonly used succulent plants and four turfgrass species were investigated for their impacts on the hydrological performance and runoff reduction of green roof lysimeters under controlled conditions using a rainfall simulator. The results showed that two succulent plants (Sedum lineare and Callisia repens) did not make significant contributions to canopy interception in any of the four seasons and made only minor contributions to evapotranspiration (ET) water loss in autumn and winter, resulting in minor effects on runoff reduction by the green roofs. Festuca arundinacea contributed 47.4–116.7% of water loss via transpiration and 36.5% of runoff reduction under a 25 mm day−1 rainfall intensity in spring and 48.0% of runoff reduction under a 10 mm day−1 rainfall intensity in winter. Poa pratensis, Lolium perenne, and Agrostis stolonifera also significantly reduced runoff. Runoff reductions by extensive green roofs were mainly caused by ET rather than by their canopy interceptions. Plant shoot biomass and ET were the primary factors controlling the runoff reduction by extensive green roofs. Our results strongly suggest that the runoff reduction capacity of extensive green roofs can be greatly improved by selecting plant species with a higher shoot biomass and ET rate.

中文翻译:

屋顶绿化:植物物种对径流的影响

绿化屋顶正在成为全球范围内一种主要的基于自然的解决方案,以减少城市雨水径流。径流的减少和保留主要取决于基质的水文特征和植物的用水策略。但是,关于植物物种如何影响绿色屋顶的水文性能知之甚少。使用降雨模拟器,研究了两种常用的肉质植物和四种草皮草种对可控条件下绿化屋顶蒸渗仪的水文性能和径流减少的影响。结果表明,两种多肉植物(线性景天和Callisia repens))在四个季节的任何一个季节都没有对冠层截留做出重大贡献,而对秋冬季的蒸发蒸腾(ET)失水贡献很小,对绿色屋顶对减少径流的影响很小。高羊茅通过蒸腾和25mm的下一天径流减少36.5%贡献失水的47.4-116.7%-1在弹簧降雨强度和10毫米天下径流减少48.0%-1在冬季降雨强度。草地早熟禾,黑麦草和lium草也大大减少了径流。大量绿化屋顶导致的径流减少主要是由ET引起的,而不是由林冠截留引起的。植物枝条的生物量和ET是控制大量绿化屋顶减少径流的主要因素。我们的结果有力地表明,通过选择具有较高芽生物量和ET率的植物物种,可以大大提高宽阔的绿色屋顶的径流减少能力。
更新日期:2018-08-02
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