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濒危植物长柄双花木自然种群数量动态
引用本文:肖宜安,何平,李晓红,邓洪平.濒危植物长柄双花木自然种群数量动态[J].植物生态学报,2004,28(2):252-257.
作者姓名:肖宜安  何平  李晓红  邓洪平
作者单位:1. 西南师范大学生命科学学院,重庆,4000715;井冈山师范学院生命科学系,江西吉安,343009
2. 西南师范大学生命科学学院,重庆,4000715
3. 井冈山师范学院生命科学系,江西吉安,343009
摘    要: 运用种群生命表、生殖力表、Leslie矩阵模型和时间序列预测分析方法,研究了濒危植物长柄双花木(Disanthus cercidifolius var. longipes)种群的动态变化过程,揭示了长柄双花木各龄级植株的数量动态规律。结果表明:长柄双花木为缓慢负增长型种群;种群的净增殖率、内禀增长率以及周限增长率都较低,世代平均周期较长;Leslie矩阵模型和时间序列预测分析均表明在未来50年内长柄双花木各年龄级种群数量会出现波动性的消长,但其种群总数将逐步下降。导致种群下降的主要原因可能是人为砍伐及由此造成的生境破碎化等。

关 键 词:种群动态  时间序列  Leslie矩阵模型  濒危植
修稿时间:2003年3月11日

STUDY ON NUMERIC DYNAMICS OF NATURAL POPULATIONS OF THE ENDANGERED SPECIES DISANTHUS CERCIDIFOLIUS VAR.LONGIPES
XIAO Yi_An , HE Ping LI Xiao_Hong and DENG Hong_Ping.STUDY ON NUMERIC DYNAMICS OF NATURAL POPULATIONS OF THE ENDANGERED SPECIES DISANTHUS CERCIDIFOLIUS VAR.LONGIPES[J].Acta Phytoecologica Sinica,2004,28(2):252-257.
Authors:XIAO Yi_An  HE Ping LI Xiao_Hong and DENG Hong_Ping
Affiliation:XIAO Yi_An 1,2 HE Ping 1* LI Xiao_Hong 2 and DENG Hong_Ping 1
Abstract:Disanthus cercidifolius var. longipes is an endangered plant species which is only distributed in Jinggang Mountain, Junfeng Mountain and Guanshan, Jiangxi Province,Longquan, Zhejiang Province, and Mangshan, Hunan Province, China. At present, its population is small and decreasing. In order to better understand its decline, we studied the population dynamics of this species using static life tables, fecundity schedules, Leslie matrices and time sequence analysis based on an in-depth investigation of age structure, seed production and seed germination rate. The results are as follows: Net reproductive rate (R0), intrinsic rate of increase (rm) and finite ratio fineries (λ) are 0.833 7, -0.004 7 and 0.995 3, respectively. Values of the separameters (R0<1, rm<0, λ<1) indicated that the population is decreasing. The Leslie matrix model predicted that over the next 50 years the number of populations would decrease from 227 1 to 764, i.e., only 30% will remain. The results of the time sequence analysis agreed with the Leslie matirix model prediction. The key threats to this species are most likely deforestation and habitat fragmentation.
Keywords:Numeric dynamics of population  Time sequence analysis  Leslie matrix model  Endangered plant    Disanthus cercidifolius  var    longipes
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