摘 要 ：对中国特有单种属濒危植物明党参杭州种群的生存过程进行了数量分析。针对难以测量明党参个体年龄的问题 ,基于实验数据利用 L ogistic生长模型估算其年龄并得到可估测年龄最高界限为 5 0 a。数量分析表明 ,目前明党参种群表现出衰退趋势 ,种群年龄结构类似于老年型 ,种群的净增殖率、瞬时增长率和周限增长率均较低 ,世代周期较长。运用 L eslie矩阵模型分析预测未来 30 a中种群个体数量将呈现出下降趋势。在所研究的样地中 ,明党参种群种子萌发和幼苗期 (0～ 5 a) ,成熟期 (15～2 5 a)和老年期 (4 5～ 5 0 a)受到了环境筛的强烈作用。
Abstract:Changium smyrnioides Wolff, a monotypic species of Umbellaceae, occurs only in a narrow zone in the eastern to middle part of the Yangtze River Basin, south part of China. As a result of human activity and its biological characteristics, C. smyrnioides has already become an endangered species. It is important to understand the basic life history and growth process as well as endangered mechanism. Because of the difficulty in estimating the age of C. smyrnioides individuals, a Logistic Growth Model was used ...