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首页> 外文期刊>Annals of Botany >Performance of dryland and wetland plant species on extensive green roofs.
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Performance of dryland and wetland plant species on extensive green roofs.

机译：广阔的绿色屋顶上的旱地和湿地植物种类的表现。

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Background and Aims: Green roofs are constructed ecosystems where plants perform valuable services, ameliorating the urban environment through roof temperature reductions and stormwater interception. Plant species differ in functional characteristics that alter ecosystem properties. Plant performance research on extensive green roofs has so far indicated that species adapted to dry conditions perform optimally. However, in moist, humid climates, species typical of wetter soils might have advantages over dryland species. In this study, survival, growth and the performance of thermal and stormwater capture functions of three pairs of dryland and wetland plant species were quantified using an extensive modular green roof system. Methods: Seedlings of all six species were germinated in a greenhouse and planted into green roof modules with 6 cm of growing medium. There were 34 treatments consisting of each species in monoculture and all combinations of wet- and dryland species in a randomized block design. Performance measures were survival, vegetation cover and roof surface temperature recorded for each module over two growing seasons, water loss (an estimate of evapotranspiration) in 2007, and albedo and water capture in 2008. Key Results: Over two seasons, dryland plants performed better than wetland plants, and increasing the number of dryland species in mixtures tended to improve functioning, although there was no clear effect of species or habitat group diversity. All species had survival rates >75% after the first winter; however, dryland species had much greater cover, an important indicator of green roof performance. Sibbaldiopsis tridentata was the top performing species in monoculture, and was included in the best treatments. Conclusions: Although dryland species outperformed wetland species, planting extensive green roofs with both groups decreased performance only slightly, while increasing diversity and possibly habitat value. This study provides further evidence that plant composition and diversity can influence green roof functions.Digital Object Identifier http://dx.doi.org/10.1093/aob/mcr007
机译：背景和目的：屋顶绿化是指构建的生态系统，植物在其中可以提供有价值的服务，可以通过降低屋顶温度和拦截雨水来改善城市环境。植物物种在改变生态系统特性的功能特征上有所不同。迄今为止，在广阔的绿色屋顶上进行的植物性能研究表明，适应干旱条件的树种表现最佳。但是，在潮湿潮湿的气候中，较湿土壤典型的物种可能比旱地物种具有优势。在这项研究中，使用广泛的模块化绿化屋顶系统对三对旱地和湿地植物物种的生存，生长以及热力和雨水捕获功能的性能进行了量化。方法：将所有六个物种的幼苗在温室中发芽，并种植在具有6厘米生长培养基的绿色屋顶模块中。在随机区组设计中，共有34种处理方法，包括单一养殖中的每种物种以及湿地和干旱地物种的所有组合。绩效指标是两个模块在两个生长季节中记录的每个模块的存活率，植被覆盖度和屋顶表面温度，2007年的失水（对蒸散量的估计）以及2008年的反照率和水分捕获。主要结果：在两个季节中，旱地植物表现更好尽管没有明显的物种或生境群体多样性的影响，但与湿地植物相比，增加混合物中旱地物种的数量往往会改善其功能。第一个冬季后，所有物种的存活率均> 75％;但是，旱地物种的覆盖率要高得多，这是屋顶绿化性能的重要指标。 Sibbaldiopsis tridentata 是单一养殖中表现最好的物种，并被包括在最佳处理中。结论：尽管旱地物种优于湿地物种，但在两组中都种植大量的绿化屋顶只会使性能稍有下降，同时增加多样性并可能增加栖息地价值。这项研究提供了进一步的证据，证明植物的成分和多样性会影响屋顶绿化功能。数字对象标识符http://dx.doi.org/10.1093/aob/mcr007

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