Tree Population Dynamics over 12 Yr in a Warm Temperate Broad-leaved Evergreen Forest at Mt Peitungyen, Central Taiwan

北東眼山暖溫帶常綠闊葉林的十二年樹種族群動態

10.7075/TJFS.201003.0017

宋國彰(Guo-Zhang Michael Song)；楊國禎(Kuoh-Cheng Yang)；侯智雄(Chih-Hsiung Hou)；林笈克(Jei-Ker Lin)；謝長富(Chang-Fu Hsieh)；范素瑋(Su-Wei Fan)；趙偉村(Wei-Chun Chao)

林隙 ； 干擾 ； 森林動態樣區 ； 暖溫帶林 ； 樹種族群動態 ； canopy gap ； disturbance regime ； forest dynamics plot ； warm temperate forest ； tree population dynamics

臺灣林業科學

25卷1期（2010 / 03 / 01）

17 - 27

英文

歷經12年後，複查1995年在北東眼山建立的3公頃動態樣區。從1995到2007年間，有1物種從自樣區中移出，新增5物種，總物種數自56增為60。12年期間，植株密度從3336.3 ha^(-1)增為5769.0 ha^(-1)。94.5%新增植株的胸高直徑未及5 cm。雖然植株密度增加，而胸高斷面積卻自78.7 m2 ha-1減為71.6m2 ha^(-1)。胸高斷面積明顯下降，主因為不少大樹死亡。直至2007年有15.7%大樹(DBH≥30 cm)死亡。比較1995與2007兩次調查，植株密度與胸高斷面積最優勢的十種，組成種類相似度頗高，僅優勢度排名稍有變動。亦即此12年中，主為結構變化，而組成改變很少。小樹大量增加、沒有先驅種移入及些微組成的改變，顯示往昔林冠層曾遭中型干擾。北東眼山樣區在植株密度及胸高斷面積上不小變動，這可歸因為一個干擾頻度較低的森林對於近年來干擾頻度增加的反應。

The 3-ha Peitungyen forest dynamic plot established in 1995 in a warm temperate evergreen broad-leaved forest was re-measured 12 yr later. In 2007, one species had vanished from this plot, and 5 species were newly recorded, resulting in an increase of species number from 56 to 60. In the 12-yr census interval, stem density increased from 3336.3 to 5769.0 ha^(-1), and up to 94.5% of recruits were＜5 cm in diameter at breast height (DBH). In spite of the drastic increase in stem density, the basal area dropped from 78.7 to 71.6 m2 ha^(-1). The considerable decrease in basal area was attributed to the death of many large-DBH trees. Up to 15.7% of large trees (DBH≥30 cm) were recorded as having died in 2007. Comparing the 10 most dominant species (in terms of stem density and basal area) between the 2 censuses, there was a high similarity of species composition, and the ranking only slightly differed. In other words, over the 12 yr, changes in the forest dynamics plot were mainly structural rather than compositional. A marked increment in stem density of small trees, the lack of pioneer species colonization, and little evidence of compositional changes indicate that this plot encountered medium-scale disturbances in the 12 yr. The relatively drastic changes in stem density and basal area in the Peitungyen plot might be attributed to responses of a forest with a relatively low frequency of disturbances to an abrupt increase in disturbances in recent years.

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