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应用生态学报 ›› 2022, Vol. 33 ›› Issue (5): 1215-1222.doi: 10.13287/j.1001-9332.202205.008

• 研究论文 • 上一篇    下一篇

黔中喀斯特次生林优势物种空间分布格局及关联性

杨文松1,2, 容丽1,2*, 叶天木1,2, 王梦洁1,2, 李璇1,2, 王琪1,2, 李婷婷1,2, 曾珍1,2   

  1. 1贵州师范大学地理与环境科学学院(喀斯特研究院), 贵阳 550001;
    2中国科学院普定喀斯特生态系统观测研究站, 贵州普定 562100
  • 收稿日期:2021-08-23 接受日期:2021-12-01 出版日期:2022-05-15 发布日期:2022-11-15
  • 通讯作者: * E-mail: ronglit@126.com
  • 作者简介:杨文松, 男, 1997年生, 硕士研究生。主要从事植物群落空间分布研究。E-mail: 1604379542@qq.com
  • 基金资助:
    普定喀斯特生态系统观测研究站野外调查基金项目([2020]05号)、国家十三五重点研发计划项目(2016YFC0502607)、贵州省科技计划重大专项(黔科合平台人才[2017]5411号)和贵州省世界一流学科建设计划项目(黔教科研发[2019]125号)资助。

Spatial distribution and correlation of dominant species of karst secondary forest in central Guizhou, China

YANG Wen-song1,2, RONG Li1,2*, YE Tian-mu1,2, WANG Meng-jie1,2, LI Xuan1,2, WANG Qi1,2, LI Ting-ting1,2, ZENG zhen1,2   

  1. 1School of Geography and Environmental Sciences (School of Karst Science), Guizhou Normal University, Guiyang 550001, China;
    2Puding Karst Ecosystem Research Station, Chinese Academy of Sciences, Puding 562100, Guizhou, China
  • Received:2021-08-23 Accepted:2021-12-01 Online:2022-05-15 Published:2022-11-15

摘要: 以黔中天龙山2 hm2喀斯特次生林为对象,采用成对相关函数g(r)结合完全随机模型(CSR)研究重要值前4位优势树种的空间分布格局及其关联性。结果表明: 样地树种的径级结构呈倒“J”型分布,在优势树种窄叶石栎和圆果化香的影响下,第Ⅴ径级(≥10 cm)的数量较多。窄叶石栎呈现倒“J”型分布,种群更新良好,处于生长发育初级阶段;而圆果化香和云南鼠刺随着径级的增大数量逐渐递增,成年树、大树数量远多于幼树、小树,表明该种群更新不足,处于生长发育的中后期并逐渐衰退。除窄叶石栎外,其余优势树种整体呈现出在较大尺度上聚集分布,聚集程度随着尺度的增大逐渐下降并趋于随机分布,此规律在幼树径级中表现得尤为突出;而受各种因素的影响,各个树种不同径级呈现出不同的空间分布格局。在种间关联上,4个优势树种之间大多呈现负关联或者无关联关系,树种重要值越高与其他优势树种关联程度越低,呈现负关联的2个树种在小尺度上关联程度最低,随着尺度的增大负关联程度逐渐降低并趋向于无显著关联。

关键词: 喀斯特次生林, 空间分布, 种间关联

Abstract: We analyzed the spatial distribution pattern and correlation of the top four dominant tree species in a 2 hm2 karst secondary forest plot of Tianlong Mountain in central Guizhou, using pairwise correlation function g(r) combined with a completely random model (CSR). The results showed that the diameter structure of trees followed an inverted J-shape, and that more trees belonged to diameter class Ⅴ (≥10 cm) driven by the dominant trees of Lithocarpus confinis and Platycarya longipes. L. confinis presented an inverted J-shaped distribution, and the population could renew very well and was in the primary growth stage. The abundance of P. longipes and Itea yunnanensis increased gradually with increasing diameter class. The density of grown and large trees was far more than the young and small individuals, which indicated poor population regeneration, and the population was in the middle and late growth stages. The top dominant tree species, except L. confinis, showed clustering distribution at large scale, which was decreased gradually with scale and trended to distribute randomly. The pattern was particularly prominent in the diameter class for young trees. Different diameter classes of different tree species presented diffe-rent spatial distribution patterns which influenced by many factors. In terms of interspecific associations, the four dominant tree species showed negative or no associations. The higher importance value of tree species, the lower the degree of association with other dominant species. The two negative correlation tree species had the lowest degree of correlation at small scale. With the increase of spatial scale, the degree of negative correlation decreased gradually, and tended to be no correlation.

Key words: karst secondary forest, spatial distribution, interspecific association