林冠空间填充和光资源分割对物种共存的影响研究

物种多样性的维持机制是群落生态学研究核心科学问题之一。之前研究主要关注物种属性(生理、形态、物候)差异和功能性状之间权衡来考查物种间的共存机制，较少从林冠空间的角度来衡量物种的空间利用效率和对限制光资源的分割，而从三维角度揭示物种生活史策略可以为探讨物种多样性维持机制提供新的视角。申请人在博士期间研究了八大公山25ha 样地59个物种树结构关系(胸径-树高，树高-冠幅/冠深)，发现物种在高大-矮小和需光-耐荫连续体上表现出光适应的生活史策略。本项目在博士期间工作上提出，在八大公山样地基础上拟建立3ha生长监测样地，利用群落内所有个体的树结构和光环境数据，结合层次贝叶斯模型等方法，分析物种多样性与林冠填充效率的关系以及填充方式对物种间光竞争的影响，旨在阐明空间填充和光资源分割对物种多样性的影响机制。本项目的实施将促进生物多样性维持机制相关理论的发展，并可以为森林管理与提高生产力提供指导依据。

The maintaining mechanism of species diversity is a key question in community Ecology studies. Innumerable studies seek progress in differences in physiological, morphological, phenological or ecological among species and trade-off between functional traits. However, few studies have examined species coexistence with canopy space filling efficiency and light resource partitioning from a canopy perspective. During the period of my PhD candidate, I studied tree architecture of 59 co-occurring species in the BDGS 25 ha forest plot, and found that tree species showed significant life-history strategies to light along the large-small stature and gap-shade tolerant continuum. This project was proposed on the basis of my previous study in the PhD period. Based on the 25 ha stem mapped subtropical forest plot and 3-ha tree growth monitoring plot in the Mt. Badagongshan, we first examine relationships of species richness and forest canopy filling efficiency and identify the possible drivers. Then, we try to examine whether canopy filling mode (vertical stratification) can change the competition for light among species with applying the hierarchical Bayesian model. Our aims are to explore the maintaining mechanism of species diversity under different canopy filling efficiencies. We believe that accomplishment of this project will improve our understanding of the maintenance mechanism of biodiversity, and provide guidance regarding forest management and stand productivity.