灌溉頻度與蓄排水板構型對粗放型綠屋頂開花性多年生植栽生育與降低樓地板溫度之影響

Effect of irrigation frequency and drainage plate configuration on the growth of flowering perennial herbs and lower floor temperature of extensive green roof

許文燦(Wen-Tsan Hsu) ； 黃竣暉(Jyun-Huei Huang) ； 沈榮壽(Rong-Show Shen)

《嘉大農林學報》 19卷1期 (2022/02) Pp. 29-57

摘要

本研究探討臺灣北部地區粗放型綠屋頂（extensive green-roof）適用植物之篩選，並針對灌溉頻度與蓄排水板（drainage plate）構型進行試驗，提出適用之開花多年生草本植栽種類，其增進屋頂綠化景觀與生態效益。試驗參試六種灌溉頻度與兩種蓄排水板構型對四種開花植物之組合，藉由影像俯視拍攝紀錄綠覆率，並從其存活率及生長覆蓋指數評估其適宜性。結果顯示，於種植14個月後，除了射干（Belamcanda chinensis）外，洋吊鐘（Kalanchoe tubiflora）、萱草（Hemerocallis fulva）及紫嬌花（Silene pendula）均可達到80%以上的存活率，高頻度灌溉（1天或7天）存活率皆顯現較高；蓄排水板類型及植物種類對存活率具有顯著性差異，以萱草為佳；生育表現，二種蓄排水板類型綠覆率皆未達60%，但洋吊鐘及萱草之相對性綠覆率仍具有持續增加之特性。高頻度灌溉對於介質底層溫度具明顯的降溫效果，需水量大者，推薦可擇Type-I蓄排水板較佳。綜合以上結果，有助於施作粗放型綠屋頂時提供開花性植栽之選擇依據並推薦可用之灌溉頻度和蓄排水板構型。

關鍵字

生長覆蓋 ； 屋頂薄層綠化 ； 維護

並列摘要

This study explores the selection of suitable plants for extensive green-roofs (EGR) in northern Taiwan, and conducts experiments on irrigation frequency and drainage plate configuration, and proposes suitable flowering perennial herbaceous plant species, which will increase in the future green roof landscape and ecological benefits. The experiment tested the combination of six irrigation frequencies and two types of drainage plate configuration on four flowering plants, recording the green cover rate through video overhead shooting, and evaluated its suitability from its survival rate and growth coverage index. The results showed that after 14 months of planting, except for Belamcanda chinensis, Kalanchoe tubiflora, Hemerocallis fulva and Silene pendula all achieved a survival rate of more than 80%. High-frequency irrigation (1 d or 7 d) has a higher survival rate; the type of drainage plate and plant species have significant differences in survival rate; meanwhile the growth performance, on the green cover rate of the two types of drainage plate are not up to 60%, but the relative green cover rate (RGCR) of Kalanchoe tubiflora and Hemerocallis fulva still has the characteristics of continuous increase on RGCR. High-frequency irrigation also has a significant lower the temperature effect between the roof floor and the bottom temperature of the medium. For those plants with large water demand, it is recommended to choose type-I storage and drainage plates. In summary, it is helpful to provide a basis for the selection of flowering plants and recommend the available irrigation frequency, and the configuration of the storage and drainage board when constructing EGR.

並列關鍵字

growth coverage ； thin roof greening ； maintenance