鳥心石造林之研究

The Plantation Study of Michelia Compressa Var. Formosana at Charng-Ching Nursery, Lo-Tung

林虔隆(Chien-Lung Lin)

《華岡農科學報》 10期 (2002/12) Pp. 69-86

摘要

島心石因過去數十年來中低海拔闊葉樹林伐採而蓄積量大減，又因生長緩慢，推廣造林不多，再加上種子貯存不易，發芽率低，促使本樹種基因庫面臨匱乏之虞。為保育此一鄉土樹種，亟待研究人員進行遺傳育種相關試驗。
林務局羅東林區管理處長青苗圃島心石種子園自民國六十九年設置以來即肩負基因保育與種苗生產之目的。園內各母樹後裔林木經過二十年生長發育，吾人發現各母樹後裔木之存活率舆胸徑生長在母樹間有極大之差異，然樹高生長、樹幹分叉林木株數比率和單株林木平均主幹數等三項目則在母樹間差異不顯著；結果並顯示環境因子掌控烏心石林木生存、生長與發育，而母樹遺傳影響效應低，甚至無效應。若將主幹分叉林木生長發育情形與主幹單一者相比較，後者胸徑較大且樹高較高。故吾人應對烏心石物候學深入研究，以期對該樹種更進一步瞭解。

關鍵字

鳥心石 ； 種子園 ； 基因庫

並列摘要

The storage amount of Michelia compressa var. formosana was greatly reduced in the past 30 decades; mainly due to harvest of lower-and/or middle-elevation hardwood stands. Difficult seed storage, low seed germination percentage, slow growth, and fewer plantations made the gene pools of M. compressa var. formosana poorer. Thus, related genetic and breeding experiments are expected in the near future to conserve the native M. compressa var. formosana species.
The purposes of establishing M. compressa var. formosana seed orchard at Charng-Ching Nursery, Lo-Tung in 1980 were gene conservation and seedling production. After twenty year of tree growth and stand development, very significant differences in survival ratio and DBH growth were found between selected 30 trees. However, no differences were found in height growth, main stem condition, and mean stem number. The results showed that environmental factors control the survival, growth, and development of M. compressa var. formosana. Yet, the effect of selected tree was low or none. As compared to the forked-stem trees, the straight-stem trees were wider in DBH and taller in height. Therefore, the phenology of M. compressa var. formosana should be conducted in the near future.

並列關鍵字

Michelia compressa var.formosana ； seed orchard ； gene pool