摘要
本文研究了我国特有、分布区极狭窄的一年生草本植物———杭州石荠苎（Ｍｏｓｌａｈａｎｇｃｈｏｗｅｎｓｉｓ）种群的密度制约规律。结果表明：在生长季内，种群的死亡率与密度密切相关。种群的最适密度为２００～１０００株／ｍ２左右。不同密度种群的平均株高、开花数等性状随时间的动态关系均符合“ｌｏｇｉｓｔｉｃ”模型。高密度种群中６０％左右的个体能完成生活史；低密度种群中８０％以上的个体能完成生活史。
The effects of population density of Mosla hangchowensis was studied. The results showed: (1)In the growing season, its mortality rate depended on its population density of M.hangchowensis. The optimal density of M.hangchowensis was 200～1000 individuals/m 2. (2)The relationships of the plant height or number of flowers bloomed and the dates fitted the Logistic function. (3)In the growing season ,about 60% of individuals at a high density can complete their life cycle, whereas, 85% at a low density can do. Most of morphological and reproductive traits were density dependent.
出处
《生物多样性》
CAS
CSCD
1999年第2期127-131,共5页
Biodiversity Science
基金
国家自然科学基金重大项目
浙江省自然科学基金
关键词
杭州石荠苎
种群密度制约
死亡率
繁殖投资
Mosla hangchowensis, population density effect,mortality rate, reproductive effort
