Altitudinal biodiversity patterns of seed plants along Gongga Mountain in the southeastern Qinghai-Tibetan Plateau

The mechanisms underlying elevation patterns in species and phylogenetic diversity remain a central issue in ecology and are vital for effective biodiversity conservation in the mountains. Gongga Mountain, located in the southeastern Qinghai-Tibetan Plateau, represents one of the longest elevational gradients (ca. 6500 m, from ca. 1000 - 7556 m) in the world for studying species diversity patterns. However, the elevational gradient and conservation of plant species diversity and phylogenetic diversity in this mountain remain poorly studied. Here, we compiled the elevational distributions of 2,667 native seed plant species occurring in Gongga Mountain, and estimated the species diversity, phylogenetic diversity, species density, and phylogenetic relatedness across ten elevation belts and five vegetation zones. The results indicated that species diversity and phylogenetic diversity of all seed plants showed a hump-shaped pattern, peaking at 1800 - 2200 m. Species diversity was significant...

物种与系统发育多样性（phylogenetic diversity）的海拔分布格局形成机制，长期以来都是生态学领域的核心研究议题，对于山地生物多样性的有效保护亦具有关键意义。位于青藏高原东南部的贡嘎山，拥有全球范围内最长的海拔梯度之一（相对高差约6500米，分布范围约1000至7556米），是探究物种多样性海拔格局的理想研究系统。然而，目前针对该山地植物物种多样性与系统发育多样性的海拔分布格局及其保护相关研究仍较为匮乏。本研究整理了贡嘎山境内2667种本土种子植物的海拔分布数据，并基于10个海拔带与5个植被带，分别估算了物种多样性、系统发育多样性、物种密度（species density）以及系统发育关联度（phylogenetic relatedness）。研究结果表明，所有种子植物的物种多样性与系统发育多样性均呈现驼峰型分布格局，在海拔1800至2200米区间达到峰值。物种多样性显著...