林口紅土臺地之植物相調查與邊坡植被分析

Abstract

一、林口臺地之森林植物分析，以不分級的覆蓋度及株數?介量值。?完成相似性矩陣及分群，作者不依傳統的徒手排比，而是撰寫程式，以電腦完成此二項工作。相似性公式，主要以Motyka公式及Jaccard公式?主。 二、經分析結果，林口臺地之森林植群可集?一型——半常綠的?葉林型，其下可再細分?4型。 1．虎皮楠—賊仔樹社會。 2．茜草樹—山月桃仔社會。 3．尾葉灰木—烏心石社會。 4．金毛杜鵑—海桐社會。 三、林口臺地邊緣陡坡下段植物，皆?崩場地之先驅樹種，此與臺地之土質因素，受侵蝕、沖刷而崩落有極大關連，並非一時之景觀而已，乃長期一致之現象。臺地邊坡之森林植群，?進行強迫更新與重覆演替。 四、林口臺地之特殊植物計有：流疏樹、裡白釣樟、石櫟、白校欑、嘉賜木、台灣海棗、厚葉衛矛、鐵冬青、烏來冬青、金毛杜鵑、小葉胡麻草、皺果珍珠茅、台灣馬兜鈴、百部、布朗藤、小葉海金沙、茅膏菜科植物，水生植物群。 五、建議栽植於本臺地之行道與庭園之鄉土樹種計有： (1)喬木類 烏心石、紅楠、香楠、虎皮楠、杜英、紅葉樹、大頭茶、樸樹、青剛櫟、楓、墨點櫻桃、樹杞。 (2)灌木類 流疏樹、日本柃木、山黃梔、魯花樹、金毛杜鵑、海桐、台灣冬青。

1. In this thesis, I did not follow the traditional table methods to do the work of grouping. Adopting the unscaled cover as well as the total number of individuals as the parameters, and using the Jaccard coefficient and the Motyka coefficient, I calculated the matrix of similarity to accomplish the grouping of vegetation with computers. 2. Being carefully analyzed, the vegetation of the Linkou terrace can be assigned to one type--a semievergreen forest type, which again can be divided into four sub-types: (1) Daphniphyllum glaucescens subsp. oldhamii / Evodia meliaefolia community. (2) Randia cochinchinensis / Alpinia intermedia community. (3) Symplocos sumuntia / Michelia compressa community. (4) Rhododendron oldhamii / Pittosporum tobira community. 3. The plants growing on the lower parts of the stiff cliffs arround the margines of the terrace are pioneer species. The forming of this feature is closely connected with the pedological factors, such as repeated soil erosion and landslide etc.. This is not a temporary physiognomy, but a permanent phenomenon. Therefore, the retrogressive succession among these pioneer species are forced to procceed all the time. 4. The special plants of the Linkou terrace are: Chionanthus retusus var. serrulatus, Lindera glauca, Pasania glabra, Castanopsis carlesii var. sessilis, Casearia membranacea, Phoenix hanceana var. formosana, Genitia carnosus, Ilex rotunda, Ilex uraiana, Rhododendron oldhamii, Microcarpaea minima, Scleria rugosa, Aristolochia shimadai, Stemona tuberosa, Heterostemma brownii, Lygodium microphyllum, Droseraceae, and hydrophytes. 5. The possible native plants for planting along the streets and in the gardens of the Linkou terrace are: (1) trees Michelia compressa, Machilus thubergii, Machilus zuihoensis, Daphniphyllum glaucescens subsp. oldhamii, Elaeocarpus sylvestris, Helicia cochinchinensis, Gordonia axillaris, Celtis sinensis, Liquidambar formosana, Cyclobalanopsis glauca, Prunus phaeosticta, and Ardisia sieboldii. (2) shrubs Chionanthus retusus var. serrulatus, Eurya japonica, Gardenia jasminoides, Scolopia oldhamii, Rhododendron oldhamii, Pittosporum tobira, and Ilex formosana.