Existence Analysis of Populations of Mosla Hangchowensis, an Endangered Plant

杭州石薺苧(Mosla hangchowensis Matsuch)為一年生草本植物，只分佈在中國南部浙江省沿海地區，已呈瀕危趨勢。在1993-1996年間對杭州石薺苧種群的存活率、生殖力、再生產成功率、密度等被研究中，我們發現在杭州石薺苧的生活史中有兩個環境篩，存活曲線介於Deevey-Ⅰ型和Ⅱ型之間，在整個生活史過程中均有一些個體死亡。杭州石薺苧的最適生境應該是厚土(20-30cm深)、水分中等略少、光照比全光照略低的環境條件，但現在的實際生境是山頂石壁上、路邊林綠多石薄土處，這種環境很少并且分散。人類強度改變環境引起的理想生態位消失、實際生境減少，實際生態位與理想位的差異，以及種群散佈能力仰低是該植物種瀕危的重要生態學原因。

關鍵字

瀕危；生存分析；杭州石薺苧(Mosla hangchowensis) ；種群

並列摘要

Mosla hangchowensis Matsuch is an annual herb, which is found only on the seacoast of Zhejiang province in southeast China. The species has declined in numbers and is now endangered. The survival ratio, seminal power, reproductive success ratio, and density as well as other factors were measured from 1993 to 1996, and an existence analysis was performed. There are two environmental sieves during the life history of this species, and the survival curve is between the Deevey-I and Deevey-II. A constant proportion of individuals died throughout the life cycle. The optimum niche of M. hangchowensis is a habitat with soil depth 20-30cm, with moderate to slightly wet conditions, with neither too intense nor too shaded light. The realized niche now is on the top of rocky hills or along gravel roadsides. Sites are few and dispersed. Loss of the optimum niche and a decrease of realized habitats as a result of human activities, the disparity between the realized niche and the optimum, and a low dispersal ability of populations are currently contributing to the endangerment of M. hangchowensis.

並列關鍵字

Endangered ； Existence analysis ； Mosla hangchowensis ； Population

國際替代計量

Existence Analysis of Populations of Mosla Hangchowensis, an Endangered Plant

全文下載

主題瀏覽