茂兰喀斯特森林林隙更新生态位的研究

以样地调查为基础，对茂兰喀斯特森林林隙更新生态位的研究表明，不同耐荫性的树种占据不同大小和年龄级林隙，各树种的优势度随林隙大小和年龄梯度的变化而具有较大差异。不同大小级林隙内的树种以窄生态位树种居多，多数常绿和落叶树种对林隙时间生态资源利用较充分。茂兰喀斯特森林树种的分布重现性低，多数树种以低密度种群的状态存在，表明喀斯特森林是一种较为脆弱的生态系统类型。不同树种在利用林隙生态资源上具有明显的时空分异特征，林隙是茂兰喀斯特森林物种多样性维持的重要机制。

Study on the regeneration niche of major tree species in gaps in the Karst forest in Maolan Nature Reserve

On the basis of investigation on gaps in the Karst forest of Maolan Nature Reserve, regeneration niche and related characteristics were analyzed. The results showed that trees of different shade-tolerance dominated gaps of different sizes and developmental stages, dominance of trees were quite different along gradient of gap sizes and developmental stages. Most trees in different size gaps were narrow niche species and most evergreen tree species and deciduous trees were efficient utilization on different ages gap resources. The existence of vast quantity of low density,narrow niche species in the forest indicates that Karst forest ecosystem is a vulnerable ecosystem type. The non-uniformity of species utilization on resources in gaps of different sizes and age classes indicated that niches based on gap sizes and gap age classes for tree species were time-spatial differentiation, gaps were important mechanism of species maintenance in the Karst forest in Maolan Nature Reserve.