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題 名 | 玉山國家公園沙里仙溪集水區臺灣雲杉林之動態與族群結構=Dynamics and Population Structure of Taiwan Spruce Forest in the Shalihsian Creek Watershed of Yushan National Park |
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作 者 | 蘇鴻傑; 曾彥學; 劉靜榆; | 書刊名 | 國家公園學報 |
卷 期 | 10:1 2000.06[民89.06] |
頁 次 | 頁95-127 |
分類號 | 436.12 |
關鍵詞 | 臺灣雲杉林; 塊集動態; 族群結構; 冠層孔隙; Taiwan spruce forest; Patch dynamics; Population structure; Canopy gap; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究分析玉山國家公園內沙里仙溪集水區海拔2600m處的臺灣雲杉純林之林型組成及林分齡級構造,以瞭解其族群動態與更新過程。本研究取一公頃的樣區,內分100個10m×10m之小區進行每木調查,採用群團分析法將不同直徑級之擬種區分為兩個塊集:一為大徑級臺灣雲杉為主所組成之塊集,另一為小徑級臺灣雲杉及中小徑級臺灣鐵杉為主所組成之塊集。前者代表成熟期之林分,平均樹高為35m,平均胸高直徑40cm,年齡159-317年,平均年齡220年。後者代表建造期之林分,平均樹高20m,平均胸高直徑18cm,年齡45-120年,平均年齡約83年。兩個塊集之齡級分布皆呈鐘形,顯示為不同年代所形成之同齡林;建造期之林下多發生疏伐現象,成熟期之冠層林木亦已老朽階段。此外,臺灣雲杉小苗無法更新於建造期及成熟期林下,而在帶狀溝蝕所形成之冠層疏開地上發現其更新之幼苗,此種孔隙之面積推算有1600~2500m2以上,故在單株或少數老木死亡所形成之樹冠裂隙中,未見臺灣雲杉之更新幼苗。因研究區內溝蝕或崩塌地頗多,臺灣雲杉可藉此產生的孔隙來更新,而呈現孔隙期、建造期及成熟期三種不同塊集之鑲嵌構造,經由各塊集之更替,使全林分得以持續。 |
英文摘要 | This study examined the floristic composition and age-class structure of the Taiwan spruce (Picea morrisonicola Hay.) forest in the Salihsian watershed of Yushan National Paark (elevations above 2600m). We tried to elucidate the population dynamics and regeneration process of this endemic tree species. A one-ha square sample area was selected and divided into 100 plots, each 10m×10m. For each plot, height of each tree and diameter at its breast height were measured. Based on the result of cluster analysis, the plots were divided into two patches: one composed mainly of spruce of large diameter-classes, and the other with spruce of small diameter-classes and Chinese hemlock of small and middle diameter-classes. The former represented the stand of mature phase, with an average height of 35m, an average diameters 40cm, and an average age of 220 years (range 159-317 years). The latter represented the stand of building phase, with an average height of 20m, an average diameter of 18cm, and an average age of 83 years (range 45-120 years). The age-class distribution of both patches showed a bell shape curve, indicating that they were even-aged forests formed at different times. There were obvious evidences of thinning of saplings in the stand of building phase, and senescence of canopy trees in the stand of mature phase. Also, seedlings of spruce did not occur under the forests of both patches, but were found in the canopy gaps of gully erosion. The area of the gaps was estimated to be 1600 at 2500 m2. However, openings resulted from the death of single or few old trees in later successional stages showed no sign of regeneration. Since there were many gully erosions or landslides where spruce can regenerate, the forest is capable of persistence, and shows a mosaic structure of different large patches. |
本系統中英文摘要資訊取自各篇刊載內容。