生物多样性 ›› 2011, Vol. 19 ›› Issue (2): 178-189. DOI: 10.3724/SP.J.1003.2011.12244 cstr: 32101.14.SP.J.1003.2011.12244
所属专题: 中国的森林生物多样性监测
汪殷华1, 米湘成2, 陈声文3, 李铭红4, 于明坚1,*()
收稿日期:
2010-10-09
接受日期:
2010-12-23
出版日期:
2011-03-20
发布日期:
2011-06-01
通讯作者:
于明坚
作者简介:
*E-mail: fishmj202@sohu.com基金资助:
Yinhua Wang1, Xiangcheng Mi2, Shengwen Chen3, Minghong Li4, Mingjian Yu1,*()
Received:
2010-10-09
Accepted:
2010-12-23
Online:
2011-03-20
Published:
2011-06-01
Contact:
Mingjian Yu
摘要:
种群更新是森林发育和演替过程中的重要环节。为了解古田山常绿阔叶林主要树种的更新动态, 本研究以古田山自然保护区5 ha常绿阔叶林动态样地为对象, 在对胸径(DBH)≥1 cm的木本植物个体2002年和2007年两次每木调查的基础上, 比较主要树种的补员(recruitment)和死亡状况, 分析种群大小变化趋势, 研究了群落中主要木本植物的更新特点。结果表明: (1)5年间样地内木本植物个体从13,338株增长到16,812株, 增幅达26.05%。新增4,758株胸径≥1 cm的补员个体, 同时死亡1,384株。(2)乔木、小乔木或灌木、小灌木3种生长型的补员个体数目均随径级的增大而下降, 但死亡个体却表现出不同的径级分布特点。(3)43个主要树种的平均年死亡率和年补员率分别为2.26%和5.90%。其中, 19种小乔木或灌木在径级I(1 cm≤DBH<2.5 cm)的补员率均高于死亡率, 但径级II(2.5 cm≤DBH<5 cm)、径级III(DBH≥5 cm)的补员率均和死亡率差别不大; 而24种乔木各径级死亡率和补员率的关系则相对复杂。(4)43个主要树种中有31个为增长型种群, 其余12个呈小幅度负增长。10个种群大小变化率在5%以上, 属于快速变动的种群, 其中以柳叶蜡梅(Chimonanthus salicifolius)(45.13%)和矩形叶鼠刺(Itea oblonga)(16.35%)的增幅最大, 檵木(Loropetalum chinense)(-3.10%)和短柄枹(Quercus serrata var. brevipetiolata)(-1.86%)的降幅最大。研究发现, 3种生长型中, 不同物种及其各个径级的补员率和死亡率各异, 种群更新动态也有所差别, 我们推测与密度制约和生境波动有关。
汪殷华, 米湘成, 陈声文, 李铭红, 于明坚 (2011) 古田山常绿阔叶林主要树种2002-2007年间更新动态. 生物多样性, 19, 178-189. DOI: 10.3724/SP.J.1003.2011.12244.
Yinhua Wang, Xiangcheng Mi, Shengwen Chen, Minghong Li, Mingjian Yu (2011) Regeneration dynamics of major tree species during 2002-2007 in a subtropical evergreen broad-leaved forest in Gutianshan National Nature Reserve in East China. Biodiversity Science, 19, 178-189. DOI: 10.3724/SP.J.1003.2011.12244.
图2 24种乔木各径级的死亡率和补员率, 各径级中点值处作图。横轴为胸径径级(cm), 纵轴为年平均死亡率和补员率。
Fig. 2 Mortality and recruitment rates of 24 tree species in each DBH class. Points are placed above the mid-point of each DBH class.
图3 19种小乔木或灌木各径级的死亡率和补员率, 各径级中点值处作图。横轴为胸径径级(cm), 纵轴为年平均死亡率和补员率。
Fig. 3 Mortality and recruitment rate of 19 subtrees or shrubs in each DBH class. Points are placed above the mid-point of each DBH class.
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