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標題: | 臺灣東北部五指山區植群分析及其組成樹種分佈之研究 The Study of Vegetation Analysis and Distribution of Tree Components in Wucthih Shan Area, Northeastern Taiwan |
作者: | Hsien-Pin Chen 陳贊賓 |
出版年 : | 1992 |
學位: | 碩士 |
摘要: | 橫跨森隆、臺北的五指山為位於大屯、基隆火山群間的淺山丘陵,南以基隆河與五分山丘陸相隔,主稜北接大屯山頂山系東走至基隆入海。東北季風所挾帶的雨量於本區受一糸則北南走向的支稜所阻滯,使基隆至臺北盆地間短短不到二十公里的範圍即可見有年雨量明顯下降的趨勢。本研究即針對此一現象,由跟海遠近不同之各支稜兩側的常綠闊葉林做一系列的取樣,探討其間樹種組成及族群的變化,並分析距海遠近、海拔高度、方位、地形、坡度、日照等環境因數的影響。結果發現五指山區的植物社會普遍啄紅楠、大明橘等硬葉林樹種為主要優藝,且大明橘、森氏揚相、樹杞、山紅柿、白校欑等樹種的分佈及植群的分化與離海遠近、海拔高度等因數均呈顯著的相關。海拔三百公尺以下的沿海地區以紅楠、森氏楊桐、樹杞常具優勢、海拔三百公尺以上的山頂及坡面以大明橘、小葉赤楠為主。毽子榤則可於四百公尺以上的衛風稜線伴隨有白背榤、刺格、紅星杜鵑等低降分佈的種類形成局部的優藝。稀有植物鐘萼木於近海地區亦有部分族群分佈,似乎可與陸續發現之馬槽、瑞芳、金瓜石、大溪等地的分佈連成一線,形成一個較完整的東北區臨海分佈類型。並由樣區的相似性集落狀況及樹種的分佈特性推測五指山區臨海區與內陸區的分野大致在赤皮湖山和柔佛巴魯一帶。 Wuchih Shan crossing Keelung-Taipei area , is located between Tatun and Keelung vocanic group area. Keelung River divides this low altitude area into Wuchih Shan hills and Wuf en Shan hills. The main ridge of Wuchih Shan connects northerly with Ting Shan , a branch of Tatun Shan ranges. Wuchih Shan extends its range easterly to Keelung, and slowly down to the sea.The precipitation of NE monsoon has been delayed by a series of the ranges from Wuchih Shan main ridge.The distance is only near twenty kilometers from Keelung to Taipei, but it’s so clearly that the precipitation decreases quickly. The study just for this condition.According to the distance far from the sea, 53 stands were sampled in the evergreen broad-leaved forest on the both side of every branched range.Including altitude, the distance ,aspect ,topography and radiation, a total of 8 environmental factors has been evaluated. Detrended correspondence analysis (DCA) was used to ordinate 53 stands, and to group them into some vegetation types. In Wuchih Shan area, Machilus thunbergii and Myrsine sequinii always dominate in the sclerophyllous forest, and the tree components and distribution are highly correlated with the distance far from the sea arid altitude. On the coastal zone(below 300m) Machilus thunbergii and Cleyera jponica var. morii are dominant species, on the inland zone (300-500m) Myrsine sequjnji and Syzygium buxifolium catch the most dominance on the slope and hilltop. On the steep windward crest, Cyclobalanopsis acuta var. paucidentata can take partial dominance, and accompanied with some species from temperate forest, Cyclobalanopsis myrsinaefolia , Osmanthus heterophyllus var. bibracteatus and Phododenron hyperythrum. The rare plant, Bretschneidera sinensis, found some populations in Wuchih Shan area. Its distribution seems can been connected with other distribution stands , Matsao , Juifang , Chinkuashin , Tachi , and to be a more continuous and completely pattern in NE coastal area. By distribution of the main trees and cluster analysis of the similar stands , the boundary between the coastal region and the inland region of NE Taiwan , probably located along Hsin Shan range or Chihpihu Shan range. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/75851 |
全文授權: | 未授權 |
顯示於系所單位: | 植物科學研究所 |
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