赤皮青冈种群的生存分析

对福建省建瓯市的赤皮青冈种群基于径级结构数据编制静态生命表,绘制存活曲线和4种生存函数曲线.结果表明,赤皮青冈种群幼龄期有较高的死亡率;存活曲线趋于DeeveyⅢ型;随龄级增大,生存率函数值单调减小,积累死亡率值则以较小的幅度单调增大;死亡密度值在Ⅲ-Ⅴ级间波动幅度较大;Ⅶ级危险率最高,Ⅲ级次之,Ⅳ级危险率最小;种群在...

Survival analysis on Cyclobalanopsis gilva population

Timespecific life table was set up,survival curves and survival functions curves were drawn based on diameter classes data of Cyclobalanopsis gilva population in Jian′ou County,Fujian Province.The results indicated that there had been a higher mortality rate at the stage of young age.The survival curve could be described by Deevey-Ⅲ.With the increasing of age classes,the survival rate decreased and the accumulation mortality rate increased with a small degree.The mortality density values fluctuated among Ⅲ-Ⅴ age stages.The risk rate value of Ⅶ age stage was the highest,followed by that of Ⅲ age stage,and that of Ⅳ age stage was the smallest.Cyclobalanopsis gilva population would maintain stable without strong disturb.