宜蘭東北區天然植群分析

An Analysis on the Natural Vegetation in NE Yilan

于幼新(Yu-Hsin Yu)

指導教授 ： 王立志

國立臺灣大學/生物資源暨農學院/森林學研究所/碩士(2004年)

https://doi.org/10.6342/NTU.2004.01874

摘要

中文摘要

植被圖是某地區植被分類單位依其空間分布，繪製而成之地圖。由於製圖必須以植群分類為基礎，本研究為探討進行植被製圖所需要的樣區資料，以宜蘭縣東北區不同年度累積的資料分析過程為例，說明評估定量與定性資料合併分析的可行性。

研究區域位於宜蘭縣的東北區，屬於宜蘭縣頭城鎮的大部分範圍。在研究區域內，因冬季受東北季風的影響，稜線及山頂部分的植群除了演替早期的草原外，多為受風衝影響的硬葉矮林。本研究選擇1/25000高線圖及1/5000正攝影相圖為底圖，根據圖像中植物社會的形相，與環境因子如海拔與地形等初步繪製出區域內天然植物社會的區塊分布。經避開人工林，全區以64個定量的樣區、7個環境因子及610種植物，利用降趨對應分析及雙向指標種分析法，將本區植群分為6個植群型：A.金平氏冬青－豬腳楠型、B.鼠刺－豬腳楠型、C.白肉榕－大葉楠型、D.台灣胡頹子－芒型、E.包籜矢竹型、F.金毛耳草－雙穗雀稗型。參考美國植群分類系統與臺灣的植被類型將區域內的植群依形相區分成：山地常綠闊葉林、山地高草地、暖熱性矮竹灌叢、山地短草地等四個形相為主的高階植被型。將64個500m2的定量樣區的植物改成定性數據，與25個500m2的定性樣區資料合併分析，結果增加了6個植群型的實際分布範圍。比對過去不同時期調查研究取樣數目的差異對於植群分型上的影響及評估定性樣區資料合併定量樣區資料一起分析的可行性。

關鍵字

降趨對應分析 ； 植被製圖 ； 植群分析 ； 宜蘭縣東北區 ； 雙向指標種分析法

並列摘要

Abstract

The vegetation map is made according to space distribution of vegetation classification units. In other words, the basis of vegetation map is vegetation classification. This project explored the data analysis process of some vegetation stands collected in different years, which is required for mapping. This is a study to assess the feasibility of combining quantitative and qualitative in analysis.
Study area is located at the NE part of Yi-lan county, which occupies the greater part of Tou-Cheng town, Yi-lan. Influenced by strong wind of northeastern monsoon, the crest line and mountaintop are mostly covered by the windward dwarf sclerophyllous forest except for some early-seral grassland. The 1/25,000 contour map and the 1/5,000 orthophotos were selected as the base maps. According to the vegetation physiognomy and environmental factors (e.g. altitude and topography, we determined the distribution of the initial vegetation polygons within the study region. Excluding artificial forests, a total of 610 plant species and 7 environmental factors was investigated in 64 quantitative plots and the collected data were analyzed by Detrended Correspondence Analysis (DCA) and Two-way Indicator Species Analysis (TWINSPAN). The analyses recognized 6 vegetation types as follows: A. Ilex maximowicziana－Machilus thunbergii type; B. Itea oldhamii－Machilus thunbergii type; C. Ficus virgata－Machilus japonica var. kusanoi type; D. Elaeagnus formosana－Miscanthus sinensis type; E. Arundinaria usawai type; F. Hedyotis chrysotricha－Paspalum distichum type. Consulting U.S. Vegetation Classification System and Vegetation Type of Taiwan, we divided the vegetation of the study region into four classes: Subtropical evergreen broad-leaved forest, Montane tall-grassland, Warm-torrid bamboo thicket, and Montane low-grassland. The quantitative data of 64 quantitative plots (500m2) were converted into qualitative data and then combined with the data of 25 qualitative plots (500m2) in the analysis. This resulted in six more vegetation types in the actual distribution region. This report also discussed the effects of the investigations from the earlier years

並列關鍵字

Northeastern area of Yi-lan ； Vegetation Analysis ； Two-way Indicator Species Analysis ； Vegetation Mapping ； Detrened Correspondence Analysis

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