摘要
运用静态生命表、种群年龄结构图及存活率曲线和死亡率曲线,研究了重庆特有濒危植物缙云卫矛在鸡公山和北温泉后山2个自然种群的数量动态变化过程,揭示了种群龄级的变化规律,预测了种群的发展趋势.结果表明:在这2个种群内,缙云卫矛的幼苗数量都较丰富,可以有效地进行种群更新,其年龄结构基本上呈钟型,属于稳定型的种群.种群的死亡率在9龄以前不高,比较稳定,以后死亡率开始升高,种群个体数急剧减少,到12～13龄时基本达到其最大生理寿命而死亡.通过调查研究发现,导致缙云卫矛濒危的主要原因可能是人为干扰因素以及由此产生的生境破碎化.
Euonymus chloranthoides Yang is an endangered plant species endemic to Chongqing. Field data were obtained from 70 5×5 m^2 plots in Mt. Jigong and Beiwenquan of Mt. Jinyun. Based on the data obtained in the field, with the help of analyses of the static life table, the age structure and the curves of survival and mortality rate, the population dynamics of Euonymus chloranthoides Yang were studied. At the same time, the change process of ages class of the two populations of Euonymus chloranthoides Yang was analysed. The results shown that the populations of Euonymus chloranthoides Yang is a stable type because their age structure shows a shape of a bell. The mortality rate isn't high before 9 years old. Its highest lifespan is 12 or 13 years old. The main factor leading to the endangering of the species is referred as the human disturbance and the fragmentation of the habitats.
出处
《西南师范大学学报（自然科学版）》
CAS
CSCD
北大核心
2004年第1期109-113,共5页
Journal of Southwest China Normal University(Natural Science Edition)
基金
国家自然科学基金资助项目(30070080).
关键词
濒危植物
缙云卫矛
种群数量
静态生命表
年龄结构
人为干扰
卫矛科
Euonymus chloranthoides Yang
static life table
age structure
survival rate
mortality rate
population dynamics
human disturbance
