片段化生境中常见种和稀有种的共存机制：基于性状种内变异和多度的关系

This project focuses on the coexistence mechanisms of common species and rare species in the fragmented habitat. To achieve this goal, this project will study the woody plants on islands in the Thousand Island Lake (TIL`) region in Zhejiang Province, China. By analyzing the relationship between intraspecific trait variation (combing with the phylogenetic diversity) and abundance, we will study how the correlation between intraspecific trait variation and abundance shift along the heterogeneity of habitats; whether common species occupy the core position of trait space and rare species occupy the periphery position; and how the ecological similarity between common species and rare species shift along the heterogeneity of habitats. These will verify niche-based theory and neutral theory, and further our understanding on effects of habitat fragmentation on coexistence mechanisms of common species and rare species. This project will reveal the underlying mechanisms of ecology theory and provide meaningful guidelines on the biodiversity conversation in fragmented habitats.

本项目围绕“片段化生境中常见种和稀有种的共存机制”这个核心科学问题，以千岛湖地区片段化岛屿森林中的木本植物为研究对象，应用结合谱系多样性的植物功能性状为研究手段，通过分析性状种内变异和多度的关系，研究不同岛屿上的异质性生境中，性状种内变异和多度相关性的变化规律；常见种和稀有种对生境的偏好，即常见种和稀有种在性状空间的分布情况；常见种和稀有种的生态相似性的变化规律，进而验证生态位理论和中性理论，探讨生境片段化对常见种和稀有种共存机制的影响特点。本项目的实施，不仅可以探究生态学理论机制，还可以为片段化生境中的生物多样性保护提供指导意义。

本项目围绕“片段化生境中常见种和稀有种的共存机制”这个核心科学问题，以千岛湖地区片段化岛屿森林中的木本植物为研究对象，测定其功能性状，发现群落功能多样性与岛屿面积呈非线性关系；环境过滤和竞争排斥共同驱动片段化森林中的群落构建过程；常见种占据群落性状空间的中心位置，且常见种性状更加灵活多变以帮助其在多样的环境中最大限度地利用广泛分布的资源，而特定的有限资源使非常见种的表现型有所限制。本项目的实施，有助于探究生态学理论机制，并为片段化生境中的生物多样性保护提供指导意义，如一定数量的小岛屿有助于维持生物多样性。