生物多样性 ›› 2020, Vol. 28 ›› Issue (3): 333-339.DOI: 10.17520/biods.2019235

• 研究报告 • 上一篇    下一篇

重度砍伐后极小种群野生植物崖柏群落结构动态

赵志霞1,2,赵常明2,邓舒雨2,3,申国珍2,3,谢宗强2,3,熊高明2,*(),李俊清1,*()   

  1. 1. 北京林业大学森林资源生态系统过程北京市重点实验室, 北京 100083
    2. 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
    3. 中国科学院大学, 北京 100049
  • 收稿日期:2019-07-25 接受日期:2019-10-08 出版日期:2020-03-20 发布日期:2019-12-24
  • 通讯作者: 熊高明,李俊清
  • 基金资助:
    国家重点研发计划(2016YFC0503100);“极小种群野生植物生存潜力与维持机制研究”课题(2016YFC0503101);国家科技基础性工作专项(2015FY1103002)

Community structure and dynamics of a remnant forest dominated by Thuja sutchuenensis after deforestation

Zhixia Zhao1,2,Changming Zhao2,Shuyu Deng2,3,Guozhen Shen2,3,Zongqiang Xie2,3,Gaoming Xiong2,*(),Junqing Li1,*()   

  1. 1. Beijing Key Laboratory for Forest Resources and Ecosystem Processes, Beijing Forestry University, Beijing 100083
    2. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093
    3. University of Chinese Academy of Sciences, Beijing 100049
  • Received:2019-07-25 Accepted:2019-10-08 Online:2020-03-20 Published:2019-12-24
  • Contact: Gaoming Xiong,Junqing Li

摘要:

砍伐导致濒危植物种群个体数量减少, 群落结构改变, 加剧物种灭绝风险。崖柏(Thuja sutchuenensis)为典型极小种群野生植物, 森林砍伐是导致其种群数量急剧下降的主要原因。但是, 到目前为止, 有关崖柏种群及其群落对砍伐的响应鲜有报道。本研究以重度砍伐后的崖柏群落为研究对象, 基于对崖柏群落固定样地的调查和两次复查, 对比分析了伐后崖柏种群径级结构、种群生存力、物种多样性及其群落结构动态等特征。结果表明: 崖柏残存群落伐后13年崖柏种群个体数量增加了22.58%, 其中幼苗幼树占85.71%, 而崖柏种群生存率下降25.43%, 种群死亡密度和危险率分别增加了24.12%和28.62%。崖柏群落物种丰富度和Shannon-Wiener指数分别增加96.43%和33.35%。研究结果表明, 砍伐使崖柏种群生存力及其在群落中的优势度持续下降, 崖柏占优势的针阔混交林有向阔叶林演替的趋势, 崖柏种群受到严重威胁, 亟需采取紧急保护措施。

关键词: 砍伐, 崖柏, 极小种群野生植物, 种群生存力, 群落结构动态

Abstract:

As forests are destroyed, remaining habitats may have too little area to sustain viable populations as extinction follows forest loss or fragmentation. Thuja sutchuenensisis, a typical Wild Plant with Extremely Small Populations (WPESP), once been declared extinct in the wild, were rediscovered in 1999. However, recent deforestation is a major threat to T. sutchuenensisis survival. Few studies have explored community responses by T. sutchuenensisis to long-term logging. Here, we quantified the population size, population viability, and community composition of the remaining T. sutchuenensisis forests following illegal and severe logging, based on three surveyed datasets on the permanent plots in 2004, 2010 and 2016, respectively. The results show that remaining T. sutchuenensisis seedlings and saplings had increased by 85.71% after 13 years of illegal logging. The population survival rate of T. sutchuenensisis decreased by 25.43%, in contrast, the death density and extinction risk rate increased by 24.12% and 28.62%, respectively. Meanwhile the species richness and the Shannon-Wiener index of the community showed an increase with 96.43% and 33.35% after 13 years of logging. The results demonstrate that the population viability and the dominance of T. sutchuenensisis in the remaining community show strong decline, and the coniferous and broad-leaved mixed forest dominated by T. sutchuenensisis is likely to be replaced by broad-leaved forest. Our results also have important implications for small population conservation, given that the remaining forest may play a unique role in the persistence of T. sutchuenensisis.

Key words: deforestation, Thuja sutchuenensis, Wild Plant with Extremely Small Populations (WPESP), population viability, community structure dynamics