綠屋頂容器盆壁開孔率對介質溫度之影響

The effect of container open porosity on substrate temperature in green roofs

方智芳(Chih-Fang Fang)

蒸發作用 ； 生態屋頂 ； 不織布容器 ； 根溫 ； 熱傳導 ； ecological roof ； evaporation ； non-woven container ； root zone temperature ； thermal conductivity

造園景觀學報

21卷3期（2016 / 10 / 01）

25 - 44

繁體中文

以塑膠容器作為綠屋頂的材料，具備耐用、質輕、經濟等優點。然而塑膠容器易導致介質的高溫而影響植物生長。如能在塑膠容器表面開設孔洞，可降低介質溫度，將有利於植物生長。因此本研究目的旨在探討塑膠容器的開孔率對介質溫度的影響。以不織布容器（開孔率P100%）及塑膠容器三種開孔率（P40%, P20%及P0%）為處理，在介質表層、表層以下5cm、10cm及15cm設置熱耦線，紀錄62天的介質溫度變化。結果顯示溫度分佈可分為兩群，群I為P100%及P0%，群II為P40%及P20%。群I高於群II 0.51∼ 2.02℃。開孔率100%及0%的容器在5 cm及10 cm處，各有一天超過根部的適生臨界溫度37.8℃。建議塑膠容器有適當的開孔率將可有效降低介質溫度。

Plastic containers are durable, light and inexpensive when used in green roofs . However, plastic containers produce high substrate temperatures that can injure plant growth. A porous container wall may promote the plant growth. Therefore, this study clarifies the relationship between container porosity and the substrate temperature. Four treatments were used, with porosities of 100%, 40%, 20% and 0% (P100%, P40%, P20% and P0%). Thermal couples were set up at the substrate surface, under substrate of 5 cm, 10 cm and 15 cm. The temperature in the substrate was recorded from Aug, 04, 2015 to Oct, 04, 2015. It revealed that the substrate temperatures were divided into two groups. Group I were P100% and P0%, group II were P40% and P20%. The substrate temperature of group I were higher than group II 0.51∼2.02℃. Thus, an adaptive porosity of P40% or P20%, for example, can reduce substrate temperature effectively.

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