日照對薄層綠化屋頂植物生長與開花之影響

植株低矮的地被頗適合屋頂薄層綠化應用，選擇賞花性高且花期長的植物，較能增進景觀品質。本研究針對8種常見地被植物，探討3種日照環境(100%、70%、40%)對其生長與開花之影響。採試驗方式，地點位於建物屋頂平台，以1年時間調查綠覆率、株高及開花率。結果發現賞花性較佳的是細葉雪茄花與麒麟花，全年開花不斷，於3種日照環境開花均佳，但麒麟花於日照100%開花明顯更多；即使40%日照，開花仍是其中較佳者。但麒麟花於3種日照均生長緩慢，1年都未滿覆，若需提早被覆地表，建議3吋盆苗定植株距需小於10cm；其他7種植物於第2季多已近滿覆狀況。植物於1年試驗期間株高多維持30cm以下，較低矮的是蔓花生與紅尾鐵莧，株高約10cm。本研究結果可提供末來於不同日照環境栽植賞花性地被之選種參考。

關鍵字

光度；綠覆率；株高；開花率

並列摘要

Low ground cover plants are suitable for thin green roof applications. Ground covers with flowers can even improve landscape aesthetics. This study discussed the effect of different light environments (sunlight exposure of 100%, 70% and 40%) on blossom of eight ground covers. The experimental site was located on the floor roof. The test items included: green coverage rate, plant height, and flower percentage. The research period was 1 year. The results showed that Cuphea hyssopifolia & Euphorbia milii had better flower percentage and bloomed all year round, and they are ideal ornamental ground covers. But Euphorbia milii was slowly growing, after a year was not covered all. The plant height of Arachis duranensis & Acalypha pendula are low, about 10cm. The results can serve as reference in selection of ornamental ground covers in different sunlight environments.