Functional green roofs: Importance of plant choice in maximising summertime environmental cooling and substrate insulation potential
Functional green roofs: Importance of plant choice in maximising summertime environmental cooling and substrate insulation potential
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功能性绿色屋顶：植物选择对于最大限度地发挥夏季环境降温和基材隔热潜力的重要性
DOI：
10.1016/j.enbuild.2017.02.011
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发表时间：
2017
影响因子：
6.7
通讯作者：
Vaz Monteiro M
中科院分区：
文献类型：
--
作者：
Vaz Monteiro M
绿色屋顶植物可以降低夏季当地气温和建筑物的热负荷，提高居民的热舒适度。然而，人们对不同植物提供这两种生态系统服务的潜力的比较知之甚少。因此，本研究调查了某些植物是否可以比其他植物提供更多潜在的夏季环境冷却和基材隔热功能。两个夏天（2012/2013），在英国雷丁的裸露基质旁边对两种多肉植物和四种阔叶植物基因型（具有对比植物性状）的冠层进行了监测。在户外小块土地（1.5 × 1.5 × 0.1 m）内研究植物。在温暖的白天和夜晚进行连续监测，包括表明冷却潜力的变量（叶面温度）和通量（长波辐射、感热通量和蒸腾作用）。通过比较檐篷下方的地面热通量与裸露基底的地面热通量来估计基底隔热的强度。还测量了植物性状（叶子颜色或厚度）、结构参数（高度和叶面积指数，LAI）、辐射特性（反照率和发射率）和气孔导度，以帮助解释物种间冷却潜力的差异。非多肉冠层，特别是浅色冠层，具有高叶片气孔导度和高 LAI，为炎热时期的基质隔热和环境冷却提供了最大潜力，特别是与裸基质和厚叶多肉植物相比。这些结果表明，多肉植物并不最适合提供显着的夏季环境冷却和基质隔热作用，而在优先考虑这些好处的情况下，其他植物（例如丹参和水苏）可能更可取。我们的研究结果强调，除了生存、美观和成本之外，在植物选择/绿色屋顶规划过程中还应考虑植物提供一系列生态系统服务的能力。
Green roof plants can reduce local air temperatures and heat load to a building in the summer, improving thermal comfort of residents. Little is known, however, about how different plants compare in their potential to provide these two ecosystem services. Consequently, this study investigated whether some plants can offer more potential summertime environmental cooling and substrate insulation than others. Over two summers (2012/2013), canopies of two succulent and four broad-leaved plant genotypes, with contrasting plant traits, were monitored alongside bare substrate in Reading, UK. Plants were studied outdoors within small plots (1.5 × 1.5 × 0.1 m). Continuous monitoring took place during warm days and nights and included variables (leaf surface temperatures) and fluxes (long-wave radiation, sensible heat flux and transpiration) that are indicative of cooling potential. The strength of substrate insulation was estimated by comparing the ground heat flux below the canopies to that of the bare substrate. Plant traits (leaf colour or thickness), structural parameters (height and leaf area index, LAI), radiative properties (albedo and emissivity), and stomatal conductance were also measured to help explain the differences in cooling potential among the species. Non-succulent canopies, in particular light-coloured ones, with high leaf stomatal conductance and high LAI provided maximum potential for substrate insulation and environmental cooling in hot periods, particularly compared to bare substrate and thick-leaved succulents. These results suggest that succulent plants are not best suited to provide significant summertime environmental cooling and substrate insulation and that others (e.g.SalviaandStachys) might be preferable where the delivery of these benefits is a priority. Our findings highlight that, in addition to survival, aesthetics and cost, the plants’ ability to deliver a range of ecosystem services should be considered in the plant selection/green roof planning process.
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