蝴蝶蘭葉面積之估算與溫度對葉片生長之影響

Leaf Area Estimation and the Effect of Temperature on the Growth of Phalaenopsis Leaves

以葉長×寬×常數模式估算蝴蝶蘭葉面積，其中常數由迴歸係數估計法求得，可隨取樣族群之葉片大小而變動，如依葉長而分之<10cm、10-20cm、20-30cm及>30cm等級，其常數估值各為0.742、0.781、0.823與0.848。由於檢定有共同斜率之存在，故不計大小可求得共同估值0.825。並由常數之變異範圍、葉面積估值與實際葉面積之迴歸方程式及相關係數確知其適用性。以葉面積估算法比較不同溫度對白花蝴蝶蘭生長之影響，則不論葉幅、葉面積增加量、長葉率均以日／夜溫30/25°C增加量最大，其葉面積增加量為25/20°C之1.4倍、20/15°C之3.8倍。高溫有利於葉片數之發生但也有加速葉片老化及導致葉形轉為細長之趨勢。

Leaf area of Phalaenopsis white hybrid was estimated by leaf max. length × max. width × 'a factor' dervied from regression coefficient and varied with different leaf size. The factors determined from population of < 10cm, 10-20cm, 20-30cm and > 30cm leaf length ranges were 0.742, 0.781, 0.823, and 0.848 respectively. From analysis of variance for testing significance of regression slopes, there exists a common slope and that is the pooled factor 0.825. The standard deviation of factor, regerssion equation and correlation coefficient between estimated and actual leaf area all demonstrated the adequency of the model. The leaf length and width were used to calculate total leaf area per plant for Phalaenopsis white hybrid grown in phytotron at various day/night temperature. After 9-month experiment, plants grown at 30/25°C increased 1.4 and 3.8 times total leaf area compared with plants grown at 25/20°C and 20/15°C, respectively. High temperature seemed to promote leaf initiation, growth and senescence and also enhanced leaf elongation that made leaf become slender in shape, thereafter.