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基质深度和植被类型对屋顶绿化基质水分吸收能力的影响
陈兴武,甘露,尹淑霞
0
(北京林业大学草坪研究所,北京 100083)
摘要:
屋顶绿化不仅可以增加城市绿量,缓解热岛效应,为建筑隔热保温和降噪除尘,其土壤基质和植被层还能截留雨水,是城市雨水管理的新兴手段,是城市绿化方面新的研究热点。为探索粗放式屋顶绿化的雨水截流效果,试验于2014年夏在希腊雅典进行,通过3种植物(高羊茅、克里特奥勒冈和千佛手)和2种基质深度(8 cm和16 cm)组合的粗放式屋顶绿化对灌溉水的吸收量来检验其水分吸收能力,模拟其雨水截流效果。试验包括2个研究阶段,日灌溉量分别是3.6 mm和6.0 mm。结果表明,种植克里特奥勒冈和高羊茅的屋顶绿化,夏季吸水能力较强,雨水截留能力强;种植千佛手的屋顶绿化,水分消耗慢,基质湿度波动小,耐干旱,但雨水截流能力差。
关键词:  屋顶绿化  基质深度  植被类型  吸水能力  雨水截流
DOI:10.13610/j.cnki.1672-352x.20160712.001
投稿时间:2016-02-20
基金项目:国家自然科学基金项目(31302016)资助。
Effects of plant type and substrate depth on water absorption of green roof substrate
CHEN Xingwu,GAN Lu,YIN Shuxia
(Institute of Turfgrass Science, Beijing Forestry University, Beijing 100083)
Abstract:
Green roofs have been reported to significantly contribute to the increase of urban green space, alleviation of heat island effect, energy saving from heat isolation by plant covers, pollution abatement and noise reduction. Moreover, the green roof’s capability to manage stormwater runoff makes it a hot topic in the current research. To explore the performance of water storage by extensive green roof, the comparison of different vegetation types in different substrates including Festuca arundinacea Shreb, Origanum onites L. and Sedum sediforme (Lacq.) Pau., coupled with 8 or 16 cm substrate depth was conducted. Two experimental periods with shifted irrigation amount of 3.6 and 6.0 mm·d-1 were applied. It was found that green roof with Origanum or Festuca had the greatest water absorption capacity during summer, which led to great runoff reduction performance, while green roof with Sedum would lead to the poorest runoff reduction as it was not able to consume water fast enough.
Key words:  green roof  substrate depth  plant type  water absorption  runoff reduction

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