Phenology of Three Cyathea (Cyatheaceae) Ferns in Northern Taiwan

北台灣產三種桫欏屬植物（桫欏科）物候

李沛軒(Pei-Hsuan Lee) ； 邱文良(Wen-Liang Chiou) ； 黃曜謀(Yao-Moan Huang)

《台灣林業科學》 24卷4期 (2009/12) Pp. 233-242

https://doi.org/10.7075/TJFS.200912.0233

摘要

本篇物候學研究對象為三種桫欏科樹蕨類植物，包括韓氏桫欏、台灣樹蕨與鬼桫欏；研究地區位於北台灣的七星山區（北緯25度9分，東經121度33分）。2000年6月至2003年5月調查期間內，所有調查植株每年均生產孕性葉與營養葉，相對於營養葉，大多數孕性葉發生於較冷的月份。有關葉片抽芽、展葉、枯萎、及孢子成熟與釋放等物候，與月降水量並沒有顯著相關；除少數例外，大部份與月均溫有顯著相關。韓氏桫欏與台灣樹蕨的孕性葉明顯大於營養葉，然鬼桫欏的兩者差異並不顯著。韓氏桫欏、台灣樹蕨與鬼桫欏的孕性葉壽命依序為15.9、19.5與26.6個月，營養葉依序為15.0、21.2與28.3個月，這三種植物的孕性葉與營養葉壽命都沒有明顯差異。所有孕性葉在孢子釋放後仍存活7至22個月。孕性葉片在孢子釋放後孢子囊掉落，沒有新的孢子囊產生；所有營養葉一生均維持不孕（沒有孢子）的狀態。

關鍵字

韓氏桫欏 ； 台灣樹蕨 ； 鬼桫欏 ； 壽命 ； 物候

並列摘要

The phenology of 3 tree fern species, Cyathea hancockii, C. metteniana, and C. podophylla at Mt. Chihsing (25°9'N, 121°33'E) located in northern Taiwan was observed from June 2000 to May 2003. All observed plants produced both fertile and sterile leaves every year during this period. For every species, most fertile leaves emerged in cooler months, compared to the emergence months of sterile leaves. Phenological events, including leaf emergence, expansion, and senescence, and spore maturation and release were slightly correlated with the monthly precipitation but were relatively more highly correlated with the average monthly temperature although they were not significant. The sizes of fertile leaves were significantly larger than sterile ones in C. hancockii and C. metteniana, whereas they did not significantly differ in C. podophylla. The life spans of fertile and sterile leaves did not significantly differ for each of these 3 species. The mean life spans of fertile leaves were 15.9, 19.5, and 26.6 mo, whereas those of sterile leaves were 15.0, 21.2, and 28.3 mo in C. hancockii, C. metteniana, and C. podophylla, respectively. All fertile leaves remained alive for ca. 7~22 mo after releasing their spores. After releasing their spores, the sporangia detached, and no more sori were produced on the same leaf. All sterile leaves remained sterile throughout their lives.

並列關鍵字

Cyathea hancockii ； Cyathea metteniana ； Cyathea podophylla ； life span ； phenology