不同光度對四種暖地型草種生長之影響

Growth Response of Four Warm Turfgrasses to Various Light Intensities

假儉草、地毯草、聖•奧古斯汀草和狗牙根四種暖地型禾草，在全光、50%及25%透光度下進行試驗，觀察其生長情形及覆蓋速率。全光對假儉草、聖•奧古斯汀草和狗牙根之生長反應較好；50%及25%之透光度對地毯草之生長反應較佳。假儉草、聖•奧古斯汀草和狗牙根生長於50%及25%兩種透光度下，其植株各部份的生長量減少，而減少之量以狗牙根最顯著。此四種禾草之耐陰性以地毯草最佳，聖•奧古斯汀草次之，假儉草再次之，而狗牙根之耐陰性則最差。景園的草種選擇，在光線充足之向陽地種植狗牙根，可以在最短的期間內產生最大的覆蓋度和最高品質的草地；而在建築物周圍或樹蔭下等光線較差的地方種植地毯草，則可達到最好的美化效果。

Growth and coverage of four warm turfgrasses: centipedegrass, carpetgrass, St. Augustinegrass and bermudagrass were studied under 50%, 25% light intensity and full light conditions. Full light was good for the growth of centipedegrass, St. Augustinegrass and bermudagrass. 50% and 25% light intensities was good for the growth of carpetgrass, however reduced growth in centipedegrass, St. Augustinegrass and bermudagrass. The greatest reduction of growth was bermudagrass under shade conditions. Therefore, the shade tolerance of the four turfgrasses in order of decreasing tolerance are: carpetgrass, St. Auguatinegrass centipedegrass and bermudagrass. It was the heat choice of using bermudagrass in full light landscape area, which could be made the fastest coverage and got the boot quality turf. On contrary, it would be got the most beautiful landscape to select carpetgrass to plant around the building's northern spaces or under trees.