臺灣山蘇花植株大小與孕性之關係

Abstract

本研究針對臺灣北部烏來地區臺灣山蘇花，分析植株成熟度（孕性）與植株大小之相關性，評量植株大小所引用的介量包括：叢徑大小、植株寬度、葉片數量、葉片長度及寬度。植株大小所引用的介量彼此之間均呈直線正相關，其中以植株寬度與葉片長度之相關係數最高。當叢徑＜12cm時、植株寬度＜79cm、植株葉片數＜9片、平均葉長＜37.8cm或平均葉寬＜6.8cm時，植株不具孕性葉；反之，當叢徑＞15cm時、植株寬度＞85cm、植株葉片數＞19片、平均葉長＞41.6cm或平均葉寬＞7.8cm時，植株均具孕性葉。成熟植株與非成熟植株之間的植株大小介量均存一過渡帶。植株之孕性葉比例（孕性葉片數／全部葉片數比例）與各種形態介量呈S型正相關，其中又以叢徑大小為推估台灣山蘇花植株之孕性葉比例的最佳指標。

This study focuses on the correlation between plant size and fertility of Asplenium nidus sampled from Wulai, northern Taiwan. Morphological parameters used to assess plant size include rosette size, plant width, frond number, length and width of fronds. There are linear positive correlations between these five parameters. The correlation coefficient of plant width and frond length is the highest among them all. Plants with rosette size < 12cm, plant width < 79 cm, frond number < 9, average frond length < 37.8 cm, or average frond width < 6.8 cm do not produce fertile fronds. On the contrary, plants with rosette size> 15 cm, plant width> 85 cm, frond number> 19, average frond length> 41.6 cm, or average frond width> 7.8 cm produce fertile fronds. A transitional stage exists between all five morphological parameters of mature and immature plants. The ratio of fertile fronds (number of fertile fronds / number of all fronds) of each plant is S-formed positive correlation with its morphological parameters, with rosette size being the best indicator among them in estimating the ratio of fertile fronds.