生物多样性 ›› 2015, Vol. 23 ›› Issue (5): 610-618.doi: 10.17520/biods.2015051

所属专题: 森林动态监测样地专题

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古田山24 ha森林动态监测样地常绿阔叶林群落结构和组成动态: 探讨2008年冰雪灾害的影响

金毅1, 陈建华2, 米湘成3, 任海保3, 马克平3, 于明坚1, *()   

  1. 1 浙江大学生命科学学院, 杭州 310058
    2 浙江师范大学生态研究所, 浙江金华 321004
    3 中国科学院植物研究所植被与环境变化国家重点实验室, 北京 100093
  • 收稿日期:2015-03-06 接受日期:2015-05-19 出版日期:2015-09-20
  • 通讯作者: 于明坚 E-mail:fishmj202@hotmail.com
  • 基金项目:
    国家科技支撑计划课题(2008BAC39B02)和国家自然科学基金对外交流项目(31061160188)

Impacts of the 2008 ice storm on structure and composition of an evergreen broad-leaved forest community in eastern China

Yi Jin1, Jianhua Chen2, Xiangcheng Mi3, Haibao Ren3, Keping Ma3, Mingjian Yu1, *()   

  1. 1 College of Life Sciences, Zhejiang University, Hangzhou 310058
    2 Institute of Ecology, Zhejiang Normal University, Jinhua, Zhejiang 321004
    3 State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093
  • Received:2015-03-06 Accepted:2015-05-19 Online:2015-09-20
  • Contact: Yu Mingjian E-mail:fishmj202@hotmail.com

常绿阔叶林是我国亚热带地区的地带性植被, 其中最为典型而且分布最广泛的是中亚热带常绿阔叶林。为探讨2008年初我国南方发生的冰雪灾害对中亚热带常绿阔叶林的影响, 以浙江省古田山国家级自然保护区24 ha森林动态监测样地内的中亚热带常绿阔叶林为例, 研究了该森林在冰雪灾害前后(2005-2010年)的群落结构及物种组成动态。结果表明, 群落径级结构变化较小, 但群落整体补员不足且死亡率较高; 多个粒度上的群落动态显示出一致的衰退特征, 但不同生境间的群落动态存在差异; 物种多度和胸高截面积多呈减小趋势, 但频度和重要值变化不明显。同时, 物种的多度、胸高截面积、频度和重要值等次序均无明显变化。这说明2008年发生的冰雪灾害对古田山中亚热带常绿阔叶林群落的短期动态产生了较大的负面影响, 且其影响程度与植物胸径和地形等因素密切相关; 同时也反映了古田山中亚热带常绿阔叶林群落结构对冰雪灾害干扰具有一定的抵抗力。

关键词: 常绿阔叶林, 群落动态, 径级结构, 冰雪灾害, 森林动态监测样地, 古田山国家级自然保护区

Subtropical evergreen broad-leaved forest (EBLF) is the zonal vegetation of the Chinese subtropical region, among which the most typical and widely distributed type is mid-subtropical EBLF. To explore how the 2008 ice-storm affected the short-term dynamics of mid-subtropical EBLF, we examined the community structure and species composition pre and post the ice storm of the 24 ha forest dynamics plot in Gutianshan. We found that although the DBH size class structure was highly consistent pre and post the ice storm, community level recruitment was low and mortality was high. Results of community dynamics analyses conducted at various grain size scales implied general depressions, despite the different rates of change between habitats. Species abundance and ABH (area at breast height) both decreased but species frequency and IV (importance value) did not change. Species in abundance, ABH, frequency and IV were highly consistent pre and post the ice storm. The results imply that the 2008 ice storm negatively impacted the short-term dynamics of the EBLF community in Gutianshan. The severity of impact was associated with stem DBH and topography. However, the community structure of this old-growth forest showed its considerable resistance to ice storm disturbance.

Key words: evergreen broad-leaved forest, community dynamics, DBH size class structure, ice storm, forest dynamics plot, Gutianshan National Nature Reserve

图1

2005-2010年群落径级结构动态。(A)显示了2005年及2010年的群落径级结构。柱形的白色部分为2010年各径级个体数, 白色部分加上灰色部分表示2005年各径级个体数, 灰色部分则表示2005-2010年间各径级个体数的减少数量。(B)显示了相对死亡率随着径级的变化情况。虚线分隔相对死亡率> 1和< 1的情况, 虚线上方数值表示观测死亡率大于预期死亡率, y值越大则差异越大; 虚线下方数值表示观测死亡率小于预期死亡率, y值越小则差异越大。"

图2

2005年与2010年多个粒度群落生物多样性、个体数及胸高截面积的比较。箱形表示上下四分位数范围及中位数(粗线); 箱形上下方横线分别为上下四分位数加减1.5倍四分位距。图中不同字母表示组间差异显著(P < 0.05)。"

表1

不同生境群落之间生物多样性、个体数及胸高截面积变化率的单因素方差分析结果"

图3

2005-2010年间物种多度、胸高截面积、频度及重要值的变化率。竖直虚线右侧变化率为正值,左侧为负值。"

图4

2005年与2010年间物种多度、胸高截面积、频度以及重要值的相关性。○, 耐阴种, +, 阳性种。实线分隔2005-2010年间数值增大与减小的物种, 实线上方为增大种, 下方为减小种。(A)中, 虚线左侧为稀有种, 右侧为常见种。"

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