摘要
通过对银杉主要群落种群的数量统计和年龄组成的分析，编绘了银杉种群的特定时间生命表、存活曲线和年龄结构图。结果表明，银杉种群年龄超过 ２００ａ 后，出现植株个体死亡高峰，种群的平均生命期望陡降，预示着种群的生理衰退。银杉种群的存活曲线介于 ＤｅｅｖｅｙⅠ和Ⅱ型曲线之间。整个银杉种群在４０ 龄级以上的年龄结构基本表现为增长型，但不同的银杉群落种群的年龄结构差异很大，大部分种群都存在幼龄个体缺乏的现象，其中花坪林区和金佛山的 ２ 个银杉的群落种群属于严重衰退型种群，其生存前景堪忧。
The time specific life table, survivorship curve and age structure of Cathaya argyrophylla population were obtained through analysing the demography and age structures of its main coenopopulations. The results showed that after 200 years old, the death peak occurred and expected average life largely decreased for C. argyrophylla population, indicating its physiological decline. Although beyond 40 age class the age distribution of the whole population generally fit the reverse“J”type, it was quite different among the coenopopulations. Most of the coenopopulations showed that the young trees of C. argyrophylla were too few to provide enough recruitment, resulting in ageing phenomena. In Huaping of Guangxi and Jinfoshan of Sichuan, there are two seriously decreasing populations, indicating the endangered future.
出处
《生态学报》
CAS
CSCD
北大核心
1999年第4期523-528,共6页
Acta Ecologica Sinica
基金
国家自然科学基金
关键词
银杉
种群
存活曲线
年龄结构
Cathaya argyrophylla
population
coenopopulation
timespecific life table
survivorship curve
age structure
