Comparison of habitat characteristics of endangered tree species Chinese yew (Taxus chinensis (Pilger) Rehd.) during different regeneration stages
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摘要: 以福建梅花山自然保护区濒危乔木红豆杉（Taxus chinensis（Pilger） Rehd.）为对象，对红豆杉的种子排放、幼苗更新、幼树更新3个更新阶段的生境特征进行研究，并比较生态位的变化，以此评价红豆杉不同更新阶段的生境需求。结果显示：随着个体发育生长，红豆杉更新生境发生了明显转变，种子排放地与幼苗生境空间一致性较高，而它们与幼树生境存在明显的空间不一致性。从生态位角度来看，种子排放地和幼苗生境重叠指数≤ 0.5的仅有海拔和坡度2个因子，这说明幼苗的空间格局受到鸟类传播的强烈影响，鸟类传播所排放的种子能萌发并生长成幼苗。幼苗和幼树生境重叠指数≤ 0.5的因子有海拔、坡向、植被类型，说明在大尺度景观因子和庇护植被层面上，植物的更新需求出现了明显的不一致。研究结果表明红豆杉的更新生境存在明显的阶段变化，可能造成植物更新出现建成限制，使幼树阶段成为更新的瓶颈阶段。Abstract: Exploring the habitat characteristics of endangered plant species during different regeneration stages is important for plant conservation and management. Here, we compared the habitat characteristics of an endangered plant species, Chinese yew (Taxus chinensis (Pilger) Rehd.), during three regeneration stages (i.e., seed deposition, seedling, and sapling). Results showed that the regeneration habitats of T. chinensis changed with development. We found high concordance of habitat characteristics between seed deposition and seedling sites, but significant differences with sapling sites. Only two characteristics, elevation and aspect, varied between the seed deposition and seedling sites, with a niche overlap index of ≤ 0.5. However, elevation, aspect, and vegetation type showed significant differences between the seedling and sapling sites. Our results suggest that habitat-related differences among seed deposition, seedling, and sapling stages are the main reasons for the regeneration bottleneck in T. chinensis development, which may help to provide a plan for the conservation and management of endangered trees.
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