生物多样性 ›› 2018, Vol. 26 ›› Issue (11): 1147-1157.DOI: 10.17520/biods.2018135

• 研究报告 • 上一篇    下一篇

辽东山区次生林乔木幼苗组成及其年际动态

蔡军奇1, 刘大鹏2, 张淑媛1, 宗国1, 刘佳1, 白雪娇1,3,*()   

  1. 1 沈阳农业大学林学院, 沈阳 110866
    2 本溪满族自治县兰河峪林场, 辽宁本溪 117103
    3 中国科学院清原森林生态系统观测研究站, 沈阳 110016
  • 收稿日期:2018-05-04 接受日期:2018-08-18 出版日期:2018-11-20 发布日期:2019-01-08
  • 通讯作者: 白雪娇
  • 作者简介:

    # 共同第一作者

  • 基金资助:
    国家重点研发计划项目子课题(2017YFC050410501)、辽宁省农业领域青年科技创新人才培养计划项目(2015047)和国家自然科学基金 (31300378)

Composition and interannual dynamics of tree seedlings in a secondary forest in montane region of eastern Liaoning Province, China

Junqi Cai1, Dapeng Liu2, Shuyuan Zhang1, Guo Zong1, Jia Liu1, Xuejiao Bai1,3,*()   

  1. 1 College of Forestry, Shenyang Agricultural University, Shenyang 110866
    2 Benxi Manzu Autonomous County Lanhe Valley Forest Farm, Benxi, Liaoning 117103
    3 Qingyuan Forest Ecosystem Observation Station, Chinese Ecosystem Research Network, Chinese Academy of Sciences, Shenyang 110016
  • Received:2018-05-04 Accepted:2018-08-18 Online:2018-11-20 Published:2019-01-08
  • Contact: Bai Xuejiao
  • About author:

    # Co-first authors

摘要:

为了解辽东山区次生林乔木幼苗组成及其年际动态, 本文以4 ha动态监测样地为平台, 对样地内1,600个 5 m × 5 m样方进行监测。依据2014-2016年连续3年的调查, 对样地内乔木幼苗的组成、高度分布、新增和死亡年际动态、空间分布格局等进行分析。结果表明: (1)调查期间共记录到22种乔木幼苗, 3年间幼苗组成没有发生变化, 但各个样方间出现极大差异, 并且幼苗优势树种组成与样地内优势树种成分保持着一定的相似性。(2)幼苗数量在不同树种和年际间表现出较大的差异: 花曲柳(Fraxinus rhynchophylla)、色木槭(Acer mono)、胡桃楸(Juglans mandshurica)在3年间幼苗数量最多, 占幼苗总数的75.6%; 花曲柳和胡桃楸幼苗数量表现出较明显的年际波动, 其他树种波动较小, 不同树种的幼苗密度差异很大。(3)幼苗新增和死亡存在明显的种间和年际差异: 2014-2015年间幼苗的新增数量(3,888)明显高于2015-2016年间(1,710), 同时2014-2015年间幼苗死亡率(23.7%)也明显高于2015-2016年间(12.7%)。对2015-2016年间新增幼苗和已有幼苗的死亡情况进行比较可以发现, 新增幼苗总体死亡率(18.8%)明显高于已有幼苗(8.1%)。(4)对比幼苗和大树的空间分布可以发现, 样地内优势幼苗都表现出集群分布的特征。在空间分布上, 幼苗与母树保持一定的相似性。

关键词: 森林更新, 年际动态, 空间分布, 辽东山区, 次生林

Abstract:

To explore the composition and interannual dynamics of tree seedlings in the montane region of eastern Liaoning Province in China, we established 1,600 seedling quadrats of size 5 m × 5 m (25 m2) within a 4-ha plot to monitor forest dynamics. We analyzed species composition, height-class structure, interannual dynamics and spatial distribution of tree seedlings from three censuses (2014 to 2016). We recorded a total of 22 species of tree seedlings during the survey period. The species composition of tree seedlings did not vary significantly among years, but varied greatly among quadrats. Species that dominated as seedlings largely reflected the dominant species among adults. Tree seedling numbers varied significantly among different tree species across years, with Fraxinus rhynchophylla, Acer mono and Juglans mandshurica accounting for 75.6% of the total seedlings in the three censuses. The abundances of F. rhynchophylla and J. mandshurica seedlings varied greatly among three years, while the other species varied little. Similarly, seedling density also varied greatly among different species. We also found interspecific and interannual variation in new seedling recruits and those that died. Recruit abundance during 2014-2015 (3,888) was higher than 2015-2016 (1,710), and the seedling mortality rate was also higher in 2014-2015 (23.7%) than 2015-2016 (12.7%). The mortality rate of recruited seedlings (18.8%) was higher than that of existing seedlings (8.1%) during 2015-2016. Finally, we found that the dominant seedlings showed spatially clustered distributions and the spatial pattern of seedling distributions was consistent with that of adults of the species.

Key words: forest regeneration, interannual dynamics, spatial distribution, montane region of eastern Liaoning Province, secondary forest