臺東海岸山脈新港山東側植群生態研究

Study of the Vegetation Ecology of the Eastern Side of Hsinkangshan in the Coastal Range of Eastern Taiwan

楊勝任(Sheng-Zehn Yang) ； 李政賢(Cheng-Hsien Lee)

《台灣林業科學》 20卷4期 (2005/12) Pp. 341-353

https://doi.org/10.7075/TJFS.200512.0341

摘要

臺東縣新港山東側由於地形陡峭而影響其可及性與調查。本研究區屬於林務局第40林班，在海拔500~1，682m之間設置33個500平方公尺樣區並評估8個環境變數，探究植群型與可能的影響變數。植群分類使用雙向指標種分析，物種組成與影響變數則以降趨對應分析與典型對應分析。主要梯度軸與環境變數的相關性以Pearson相關性係數值表示，並藉由Monte Carlo顯著性測驗測試主要的環境梯度軸特徵值及環境因子特徵值是否顯著。結果顯示新港山區調查範圍內計有維管束植物450種，其中蕨類植物有104種，裸子植物有1種，雙子葉植物有295種，單子葉植物有50種，其中瀕臨絕滅種6種、易受害種7種、低危險種1種。本區植群可分為森氏櫟－豬腳楠型；長尾尖葉櫧型；臺灣雅楠－九芎型；小葉桑－筆筒樹型等4種主要植群型。分布序列第一梯度軸具顯著性，海拔高、坡度及最大胸高直徑為影響本區植物分布之重要環境變數。

關鍵字

新港山 ； 臺灣東部 ； 典型對應分析 ； 雙向指標種分析

並列摘要

The steep slope on the eastern side of Hsinkangshan in Taitung County makes accessibility and surveys difficult in this area. The study area belongs to the 40th compartment of the Taiwan Forestry Bureau and contains 33 plots of 500 m^2 located at elevations of 500~1,682 m. Eight environmental variables were measured and estimated for each plot. The aim of this study was to classify the major vegetation types and the variables influencing their distribution. Plant communities were classified using TWINSPAN (two-way indicator species analysis), and species- environment relationships were examined using detrended correspondence analysis and canonical correspondence analysis. The relationships between the major gradient axis and environmental variables were calculated using Pearson correlation coefficients. Significance levels of eigenvalues about the gradient axis and environment variables were tested using a Monte Carlo permutation. Results of the floristic data showed that 450 vascular plants, including 104 pteridophytes, 1 gymnosperm, 295 dicotyledons, and 50 monocotyledons were found. Among them, 6 species are endangered, 7 species are vulnerable, and 1 species has a low level of risk. The plant communities were classified into 4 major types, namely a Cyclobalanopsis morii-Machilus thunbergii type, a Castanopsis cuspidata var. carlesii type, a Phoebe formosana-Lagerstroemia subcostata type, and a Morus australis-Sphaeropteris lepifera type. The first gradient axis of ordination was significant, and elevation, slope, and maximum dbh were important variables explaining the floristic variation and community types.

並列關鍵字

Hsinkangshan ； Taitung ； classification ； canonical correspondence analysis CCA ； ordination ； two-way indicator species analysis TWINSPAN.