植物生态学报 ›› 2009, Vol. 33 ›› Issue (3): 469-481.DOI: 10.3773/j.issn.1005-264x.2009.03.006
何东1,2, 魏新增1,2, 李连发1,2, 江明喜1,*(), 杨敬元3, 喻杰3
收稿日期:
2008-09-25
接受日期:
2009-02-12
出版日期:
2009-09-25
发布日期:
2009-05-31
通讯作者:
江明喜
作者简介:
*E-mail: mxjiang@wbgcas.cn基金资助:
HE Dong1,2, WEI Xin-Zeng1,2, LI Lian-Fa1,2, JIANG Ming-Xi1,*(), YANG Jing-Yuan3, YU Jie3
Received:
2008-09-25
Accepted:
2009-02-12
Online:
2009-09-25
Published:
2009-05-31
Contact:
JIANG Ming-Xi
摘要:
以种群统计学和树木年代学的方法, 从年龄结构、生命表、径向生长和干扰史4个方面, 研究了神农架山地河岸带连香树 (Cercidiphyllum japonicum) 的种群结构与动态。结果显示:1) 连香树种群内幼龄个体比较充足, 但在长时段内更新时有断代, 多个局域种群有明显可辨的同生群 (年龄幅宽约为50a), 其发生年代在20世纪20年代和70年代, 高峰期则在40年代和90年代;2) 萌枝更新非常突出, 与种群年龄和群落盖度有显著相关 (r>0.6, p<0.05) ;3) 经20a以下和60~100a间两个死亡高峰以后, 种群可达生活力最优阶段, 180a以后出现衰老迹象, 生存曲线总体上介于DeeveyⅡ和Ⅲ型之间;4) 前30a连香树胸径的生长速率最快, 经2次生长释放后, 约在60a前后进入林冠层, 90~120a间进入成熟期前, 胸径分化最为剧烈;5) 干扰高峰年 (20世纪20年代、70年代和90年代) 与种群更新的高峰年大致吻合。这些结果表明, 个体生长发育特征与中长期的干扰对其种群结构与动态有重要影响。由于幼苗尤其是萌枝的的数量充足, 连香树种群在中短期内可以维持。
何东, 魏新增, 李连发, 江明喜, 杨敬元, 喻杰. 神农架山地河岸带连香树的种群结构与动态. 植物生态学报, 2009, 33(3): 469-481. DOI: 10.3773/j.issn.1005-264x.2009.03.006
HE Dong, WEI Xin-Zeng, LI Lian-Fa, JIANG Ming-Xi, YANG Jing-Yuan, YU Jie. POPULATION STRUCTURE AND DYNAMICS OF CERCIDIPHYLLUM JAPONICUM IN RIPARIAN ZONES OF THE SHENNONGJIA MOUNTAINOUS REGION, CENTRAL CHINA. Chinese Journal of Plant Ecology, 2009, 33(3): 469-481. DOI: 10.3773/j.issn.1005-264x.2009.03.006
图1 连香树局域种群年龄频率分布 ■主茎Main stem□萌枝Sprout X1, D1, N1, N2, Y1, Y2, Y3, Y4, Y5, Y6, Y7, Y8:局域种群的样地编号Codes of plots for each local population
Fig.1 Age frequency distribution of local Cercidiphyllum japonicum population on 12 sites
图2 连香树区域种群年龄频率分布 ■主茎Main stem□萌枝Sprout n:主茎数No.of main stems n′:萌枝数No.of sprouts
Fig.2 Age frequency distribution of overall Cercidiphyllum japonicum population
图5 连香树径向生长序列与释放年表 ▲:重度释放Major release△:中轻度释放Moderate release A、B、C、D、E、F、G、H、I、J、K、L、M、N、O、P、Q、R、S、T、U、V、W、X:各树芯编号Core number
Fig.5 Radial increment serials and release chronologies of Cercidiphyllum japonicum individuals
图6 连香树生长变化率主序列 菱形数据标记的线条为每年生长变化率 Line with rhombic pointers presents annual percent-growth change无标记的线条为样本量Line without pointer presents sample depth
Fig.6 Master serial of percent-growth change for Cer-cidiphyllum japonicum
图7 连香树释放率年表 直方柱表示每10年的释放率Decadal percentreleases are represented by bars线条表示样本量Sample depth is given by line
Fig.7 Chronology of percent-release (Proportion of re-leased sample relative to sample depth in every decade) for Cercidiphyllum japonicum
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