木根麦冬的种群数量动态

NUMERIC DYNAMICS OF OPHIOPOGON XYLORRHIZUS POPULATION

运用静态生命表、生殖力表和Leslie矩阵模型 ,研究了木根麦冬种群数量动态过程 ,揭示了种群各龄级植株的动态规律 .结果表明 ,木根麦冬种群为衰退型种群 ,种群的净增殖率、内禀增长率和周限增长率较低 ,种群世代周期偏长 ,种群不能自我更新 .在 2 0a内种群幼苗数量和总数量将持续快速下降 .木根麦冬种群在 16～ 2 0a年龄段受到了环境筛的强烈过滤作用 .表 3参

Absract Ophiopogon xylorrhizus is an endangered plant species endemic to China,only distributing in the tropical rain forests in Xishuangbanna, Yunnan. The dynamics process of O. xylorrhizus population was studied by using static life table, fecundity schedule and Leslie matrix. The population of O. xylorrhizus was of decreasing type. The net reproduction rate, intrinsic rate of increase and finite rate of increase were low, and its generation span was long. The number of one year old seedlings and total number of plants would be rapidly and continuously decreased within 20 years. In coming 16～20 a, the population would undergo a high death rate period, showing that the population was greatly restricted by an environmental sieve. Tab 3, Ref 6