生物多样性 ›› 2023, Vol. 31 ›› Issue (2): 22251.  DOI: 10.17520/biods.2022251

• 研究报告: 植物多样性 • 上一篇    下一篇

桂西南喀斯特季节性雨林幼树更新的空间分布格局及机制

马瑞霞1,2,3, 郭屹立2,3,*(), 李冬兴2,3, 王斌2,3, 向悟生2,3, 黄甫昭2,3, 陆芳2,3, 文淑均2,3, 李健星2,3, 陆树华2,3, 李先琨2,3   

  1. 1.桂林理工大学旅游与风景园林学院, 广西桂林 541006
    2.广西壮族自治区中国科学院广西植物研究所广西喀斯特植物保育与恢复生态学重点实验室, 广西桂林 541006
    3.弄岗喀斯特生态系统广西野外科学观测研究站, 广西崇左 532499
  • 收稿日期:2022-05-09 接受日期:2022-07-06 出版日期:2023-02-20 发布日期:2022-11-11
  • 通讯作者: *郭屹立, E-mail: yiliguo810414@163.com
  • 基金资助:
    国家自然科学基金(32071540);国家自然科学基金(32260286);广西自然科学基金(2022GXNSFDA035076);广西自然科学基金(2022GXNSFBA035552)

Spatial distribution pattern and mechanism of sapling regeneration in karst seasonal rainforest in southwestern Guangxi

Ruixia Ma1,2,3, Yili Guo2,3,*(), Dongxing Li2,3, Bin Wang2,3, Wusheng Xiang2,3, Fuzhao Huang2,3, Fang Lu2,3, Shujun Wen2,3, Jianxing Li2,3, Shuhua Lu2,3, Xiankun Li2,3   

  1. 1. College of Tourism and Landscape Architecture, Guilin University of Technology, Guilin, Guangxi 541006
    2. Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin, Guangxi 541006
    3. Nonggang Karst Ecosystem Observation and Research Station of Guangxi, Chongzuo, Guangxi 532499
  • Received:2022-05-09 Accepted:2022-07-06 Online:2023-02-20 Published:2022-11-11
  • Contact: *Yili Guo, E-mail: yiliguo810414@163.com

摘要:

幼树是维持森林生态系统物种多样性的重要组分, 关系着森林的群落结构和生长动态。因此, 开展幼树更新的空间分布格局及其潜在机制研究对森林群落动态至关重要。本文以广西弄岗桂西南喀斯特季节性雨林15 ha森林动态监测样地为研究对象, 选取2011-2016年的调查数据, 采用空间点格局和冗余分析方法对5年间样地内新增幼树(DBH ≥ 1 cm)的个体数量、空间格局特征和影响因子等进行分析。结果表明: 5年间样地内新增幼树共101种, 占2011年调查物种的45.3%, 幼树密度为196.5株/ha。新增幼树在0-7 m和10-16 m尺度上呈聚集分布, 在16 m尺度以上主要呈随机分布。海拔是影响幼树更新的主要因素, 其次是地形湿润度, 而生物因子对幼树更新的影响较弱。幼树数量与海拔呈负相关, 与地形湿润度呈正相关。成树个体与幼树更新中度正相关。在喀斯特季节性雨林中, 幼树更新及其空间分布格局受多种影响因子协同作用, 可能与种子扩散限制和生境异质性有关。

关键词: 喀斯特季节性雨林, 冗余分析, 空间点格局, 幼树更新, 影响因子

Abstract

Aims: Saplings are an important component of maintaining the species diversity of forest ecosystems. Their diversity is related to forest community structure and growth dynamics. Therefore, it is very important to study the spatial distribution pattern and potential mechanism of sapling regeneration for forest community dynamics. To strengthen the understanding of the dynamic changes of the northern tropical karst seasonal rainforest, we will study the spatial distribution pattern and mechanism of sapling regeneration in 15 ha northern tropical karst seasonal rainforest dynamics plot in Nonggang, southwestern Guangxi.

Methods: Based on the survey data from 2011 to 2016, the individual number, spatial pattern characteristics, and influencing factors of new saplings (DBH ≥ 1 cm) in five years were analyzed by spatial point pattern and redundancy analysis.

Results: A total of 101 species of new saplings were observed, accounting for 45.3% of the surveyed species in 2011, and the sapling density was 196.5 ind./ha. The newly increased saplings showed aggregated distribution at 0-7 m and 10-16 m scale, and random distribution above 16 m scale. Altitude is the main factor affecting the regeneration of saplings, followed by topographic wetness. Biological factors had a weak impact on sapling regeneration. The number of saplings was negatively correlated with increasing altitude, and positively correlated with topographic wetness. Moderate positive correlation between adult tree individuals and young tree regeneration was observed.

Conclusion: In this karst seasonal rainforest, sapling regeneration and spatial distribution pattern are synergistically affected by various influencing factors, which may be related to limited seed dispersal and habitat heterogeneity.

Key words: karst seasonal rainforest, redundancy analysis, spatial point pattern, sapling regeneration, influencing factors