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- Short-distance Dispersal of Intact Taiwan Sassafras Fruits in a Temperate Montane Rain Forest of Northeastern Taiwan
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題 名 | Short-distance Dispersal of Intact Taiwan Sassafras Fruits in a Temperate Montane Rain Forest of Northeastern Taiwan=臺灣東北部溫帶山區雨林內臺灣檫樹完整果實之短距離分布 |
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作 者 | 關秉宗; 郭婉君; 林世宗; 余秋豐; | 書刊名 | Botanical Studies |
卷 期 | 47:4 民95.10 |
頁 次 | 頁427-434 |
分類號 | 436.11 |
關鍵詞 | 不均勻傳播; 漿質核果; 臺灣檫樹; 風力傳播; Anisotropic dispersal; Fleshy-fruited; Sassafras randaiense; Lauraceae; Wind assisted dispersal; |
語 文 | 英文(English) |
中文摘要 | 本研究旨在探討台灣東北部棲蘭山區內臺灣?樹(Sassafras randaiense Rehder)完整果實之短距離分布特性,進而推論風力是否可能為該樹種果實潛在的傳播力量之一。研究於1999與2000年該樹種果實散播期間將蒐集網置於五株母樹下方,依八個方向蒐集由母樹中心至8公尺距離內之散播果實。而後分析所蒐集之完整果實其數目,大絲,重量是否會依距離與方向之不同而異。結果顯示受損之果實佔全部所蒐集果實之74%。在完整果實中,成熟果實之大小與未成熟者相似,然重量卻為後者之兩倍。此外本哀究亦發現(i)大多數之完整果實均散播於母樹附近,(ii)可能受地形與盛行風向之影響,較?之果實散播於北向坡,(iii)各方向之果實數量散播曲線相似,(iv)完整果實之大小不會依方向與距離之不同而有所差異,(v)散播在母樹下方與母樹冠層之外的成熟果實其重量較重。由所蒐集之完整果實在數量與重量之空間分布型式上觀之,除重力外,臺灣?樹亦可能利用風力進行短距離散播。 |
英文摘要 | The objectives of this study were to understand the within-habitat intact (both mature and immature) fruit dispersal patterns of Taiwan sassafras (Sassafras randaiense Rehder), a fleshy-fruited species endemic to Taiwan, and to investigate whether wind could be an important short-distance dispersal agent for the species. Collection traps were placed beneath the crowns of five isolated Taiwan sassafras trees located in a montane rain forest of northeastern Taiwan during the fruiting seasons of 1999 and 2000. Short-distance (up to 8 meters) dispersal patterns in number, size, and fresh weight of dispersed intact fruits were analyzed with distance from parents and dispersal direction as the explanatory variables. Results showed that damaged fruits, which were mainly fruits consumed by rodents, accounted for about 74% of the total fruits collected over the two-year period. Though the numbers of intact fruits collected were about the same in both years, more mature fruits were collected in 1999 due to the absence of a typhoon at the study sit that year. The intact fruits collected in 1999 were also larger and heavier. Within a given year and when both years were combined, matured fruits were slightly larger, but were almost twice as heavy as the immature ones. For the intact fruits, analyses revealed that (i) due to gravity most of the fruits were deposited close to the parents, (ii) more fruits were deposited in the north-bearing directions, due to local topography and the prevalent wind directions during the dispersal season, (iii) the dispersal curves in number were similar in most of the directions, (iv) the size of the deposited fruits showed no significant difference with respect to distance and directions, and (v) fruits deposited immediately beneath the crown and some distance away from the focal trees were heavier than those deposited between. The observed spatial dispersal patterns in the number and the weight of intact fruits all suggested that, besides gravity, wind could be an important short-distance agent in dispersing Taiwan sassafras. |
本系統中英文摘要資訊取自各篇刊載內容。