湖北七姊妹山珙桐种群结构研究

Population structure of Davidia involucrate in Mt.Seven-sister Nature Reserve of central China's Hubei Province

为了解珙桐的种群结构和更新情况,作者于2 0 0 2年8月3 1日—9月7日在湖北七姊妹山按照海拔梯度,设置了4块样地,用样方法对珙桐种群进行了调查.分析了珙桐的径级结构、高度结构,编制了静态生命表;绘制了存活曲线和死亡曲线;并探讨了珙桐的更新,从不同角度研究了珙桐种群的动态变化规律.结果表明,该种群前期生长不稳定,达到成熟后的种群数量保持平衡.珙桐种群缺乏有性繁殖产生的幼树。

In order to study the structure and generation of Davidia involucrate populations,the authors set up 4 stands according to altitude differences between August 31 and September 7 in 2002 The D. involucrate populations were investigated by sampling methods. The population structure both in stem size and in height were analyzed, and lifes tables, and survival and death curves were made. Finally, the regeneration of \%D. involucrate\% population was discussed. The results showed that the population was stable in the large size classes and variable in the smaller ones. The population lacked seedlings from sexual reproduction. The regeneration model of D. involucrate was sexual and asexual reproductions.