长苞铁杉林林隙内外更新层主要树种生态位

The niche of the dominant species in the regeneration layer of Tsuga longibracteata forest gaps and non-gaps

对林隙内及其所对应非林隙更新层主要乔木树种的生态位进行了测定,计测指标包括生态位宽度及生态位重叠.计测结果表明:长苞铁杉林隙内更新层主要树种生态位宽度大小顺序为长苞铁杉、细叶青冈、青冈、猴头杜鹃、米槠、深山含笑、山矾、香桂、木荷和甜槠;非林隙生态位宽度位序为猴头杜鹃、米槠、细叶青冈、木荷、深山含笑、青冈、香桂、甜槠、山矾和长苞铁杉.长苞铁杉群落林隙内外更新层主要物种生态位重叠基本符合以下规律:林隙内更新层主要物种生态位重叠值较非林隙大;更新层长苞铁杉在林隙内与生态位宽度较大的物种有较小的生态位重叠值,而与生态位宽度较小的物种有较大的生态位重叠值,非林隙则相反.

The niche characteristics of dominant species in the regeneration layer of Tsuga longibracteata forest gaps and non-gaps were measured, including niche breadth and niche overlap. The results showed that the niche breadth order of dominant species in gaps was Tsuga longibracteata, Cyclobalanopsis myrsinae, Cyclobalanopsis glauca, Rhododendron iniarum, Castanopsis carlesii, Michelia maudiae, Symplocos lancifolia, Cinnamomum ubavenium, Castanopsis reyri, Schima superba ; while in non-gaps, it was Rhododendron iniarum, Castanopsis carlesii, Cyclobalanopsis myrsinae, Schima superba, Michelia maudiae, Cyclobalanopsis glauca, Cinnamomum ubavenium, Castanopsis reyri, Symplocos lancifolia, Tsuga longibracteat. And the results of niche overlap suggested such discipline ： the niche overlap of species in the gaps was higher than that of non-gaps, and there were low niche overlap in Tsuga longibracteata with high niche breadth species and high niche overlap with low niche breadth species in the gaps, while the state of niche overlap in Tsuga longibracteata with other species in non-gaps was contrary to that in gaps.