修剪對觀賞植物寒害復原之影響──以東海大學校園為例

A Study on the Effect of Pruning on Chilling Injury Restoration of Landscape Plants in Tunghai University

台灣各地於2016年1月份受寒潮影響，出現大範圍嚴重低溫情形，對觀賞植物造成植株之受損。本研究採對照實驗，探討觀賞植物寒害後，有無修剪對其生長與復原時間之差異，針對實驗組（修剪處理）與對照組（未修剪處理）之綠覆率、綠覆速率、單株綠覆率與生長活力度進行統計分析與差異檢定。實驗結果得知紫嬌花、黃金鋤葉蔓綠絨、麒麟花統計檢定後於各項因子差異皆不顯著，受寒害影響後可直接補植。毛蛤蟆草、黃邊短葉竹蕉、變葉木統計檢定後單株綠覆率差異顯著，毛蛤蟆草、變葉木實驗組大於對照組，受寒害影響後可藉由修剪復原其生長勢；黃邊短葉竹蕉對照組大於實驗組，受寒害影響後不須修剪生長勢即可復原。小蚌蘭、玉龍草統計檢定後綠覆速率、生長活力度差異顯著，綠覆速率對照組大於實驗組，生長活力度對照組大於實驗組，受寒害影響後不須修剪因寒害受損之傷害即可復原。三類型9種觀賞植物因寒害受損後之復原程度差異與實驗結果，可做為日後維護管理的參考。

Due to the effect of cold current in January of 2016 in Taiwan, severe low temperature caused a wide range of damage on landscape plants by chilling. In this study, different intensity of pruning methods were utilized to investigate the effect of growth and recovery time on landscape plants chilling injury. By comparison of the experimental and control groups, different indexes including “greenery coverage rate”, “greenery coverage of single plant” and “growth vigor” were applied for statistical analysis and significant test. There are no significant differences in all indexes found in Society Garlic, Lemon Lime and Bojers Spurge plants after pruning. The results indicated these plants can be replantd directly after chilling injury. However, in Greeping Charley, Song of India and Croton plants, the statistically significant differences were observed. The pruning Greeping Charley and Croton showed the higher scores on “greenery coverage of single plant” than the control groups. This demonstrated the growth potential can be restored by pruning after chilling injury. On the contrary, the Song of India showed higher restored ability in the control group, therefore, it can be recovered without pruning. The “greenery coverage rate” and “growth vigor” of Compacta and Shortleaf Lilyturf species also showed significant differences after pruning. Both “greenery coverage rate” and “growth vigor” indexes were decrease when Compacta and Shortleaf Lilyturf plants were pruned. The outcomes of this study exhibited restoration degree of various landscape plants after chilling injury and will facilitate their maintenance management in the future.