步道為戶外遊憩常見的設施，其設立改變了自然環境中的空間結構，亦可能對周圍的植群造成影響。有許多研究中顯示，遊憩活動對環境的衝擊，會直接或間接的改變植物覆蓋度及物種的組成。高雄市半屏山區近年來設置步道，亟需一些環境資料來作為管理之依循，但對於步道旁的植群結構及步道的實質衝擊仍不明瞭，本研究在半屏山區之步道周圍進行植群及環境因子的取樣，該區之步道有三種不同的型式，分別為木棧道、一般登山小徑及碎石步道，沿著主要步道共設有35個10×10㎡及132個1×1㎡的樣區，以Two-way indicator species analysis （TWINSPAN）及 Canonical correspondence analysis（CCA）將植群介量與環境因子進行相關性分析，探討該區域植群種類組成及分布與步道的環境變異的相關性。
結果顯示，半屏山區的優勢植被主要為構樹、血桐，而依照不同之次優勢種，可分為四個亞型；地被層在經TWINSPAN分析後，可分為六個植群型；在與環境因子進行CCA的分析結果顯示，主要影響該地區地被植群之環境因子為光照及土壤水分和深度；不同形式的步道間，差異不明顯，但登山小徑的環境異質性較高；步道周圍與林內的地被層也因現今輕微之遊憩活動型態及半屏山區的地質結構影響，使其間的差異並不明顯。

Trail is a common outdoor recreation facility. The construction of trail often changes space structures of the nature and affect the vegetation of the trailside. Many studies indicated that the impact of outdoor recreation directly and indirectly change the plant species coverage and composition. A few new trails were recently established in Panping-Shan, Kaohsiung, and there is a need of environmental data for the management . However, the vegetation structure along the trail and the degree of trail construction impact were unclear. This study sampled vegetation and environmental factors along the trails in Panping-Shan, Kaohsiung. The trail in Panping-Shan has three patterns, footpath, plank and macadam. 35 large plots （10*10m2）and 132 small plots （1*1m2） have been established along the trail. The data were analyzed with Two-way indicator species analysis （TWINSPAN）and Canonical correspondence analysis （CCA） to seek the correlation of the vegetation composition, species distribution and the trailside environment gradient.
The results show that the dominant species in Panping-Shan are Broussonetia papyrifera and Macarange tanarius, and the vegetation could be divided into four subtypes according to the indicator species; the understory vegetation could be divided into six types by TWINSPAN. The CCA result shows that the canopy coverage and the edaphic factors, soil depth and soil moisture, are the major environment factors influencing the understory vegetation. Between the different patterns of trail, there were no significant difference, but the environment of the footpath is more heterogeneous. It is suspected that the current light recreation activities and the unique geological structures made no obvious understory vegetation difference between the trailside and the forest interior.

壹、前言
貳、研究區域環境因子概述
參、研究方法
一、植被圖的繪製
二、樣區設立與取樣方法
三、植群型分類
四、環境因子觀測
五、植群與環境之關係13
肆、結果
一、半屏山地區優勢植被型
二、步道周圍之主要植群型
三、步道周圍之地被植群型
四、地被植群與環境因子之關係
五、不同型式之步道植群與環境因子之關係
六、林內地被層及步道周圍地被層之差異
伍、討論
陸、參考文獻
附錄一 半屏山地區植物名錄
附錄二 表一之植物代碼
附錄三 圖十、表二及表九之植物代碼

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