木论喀斯特常绿落叶阔叶林木本植物萌生特征

萌生更新是植物进行自我更新的重要方式之一。为了阐明喀斯特常绿落叶阔叶林植物的萌生特征，基于木论25 hm²动态监测样地的调查数据，分析了木本植物萌生更新数量特征、不同生活型植物萌生能力的差异、萌生能力与地形因子和萌生能力与物种多样性的关系。研究结果表明：样地具有萌生现象的木本植物共有197种，隶属59个科137个属，分别占样地植物科属种的86.8%、93.7%、91.3%。萌生现象在样地内各物种中普遍存在，滇丁香、长管越南茜、火棘、香叶树等物种的萌生能力较强。不同生活型的植物的萌生能力存在显著差异，常绿树种的萌生能力显著高于落叶树种（P<0.001）。萌生物种丰富度比例及萌生物种个体比例都与群落物种多样性呈显著正相关。萌生能力与土层厚度呈显著负相关，与凹凸度呈显著正相关，此外萌生物种丰富度比例还与海拔呈正相关关系，而萌生物种个体比例与岩石出露率和土壤坡度呈正相关关系。由此可见，作为喀斯特森林群落更新中一种占优势的更新方式，萌生更新在一定程度上能够增加群落物种多样性，萌生能力与地形因子存在一定关联。

Characteristics of sprouting in woody plants in evergreen-deciduous broadleaf karst forest in Mulun National Nature Reserve

Evergreen-deciduous broadleaf karst forest is an important part of vegetation in China. However, with the increase of population and the development of social economy, these evergreen-deciduous broadleaf karst forest have been disturbed by human beings. The karst region in southwest China is characteristiced as ecological system instability and poor anti-disturbance; the shortage of soil resources; high habitat heterogeneous and rock exposure rate, but low vegetation cover; as well as serious soil erosion. Under the special habitat conditions of karst forest ecosystem, plants are limited by seed regeneration, and the number of seeds is small, the dispersal and germination are difficult, and the regeneration of seedlings is slow. Sprouting is one of the important means of plants self-renewal in this ecosystem. studying the sprouting characteristics of woody plants could provide a scientific basis for the early vegetation restoration of the degraded karst forest ecosystem after disturbance. Using data collected from a 25 hm² plot in the Mulun National Natural Reserve in Guangxi Province, China, we analyzed the sprouting characteristics of woody plants in the large plot of the peak-cluster depression region, differences in the sprouting ability of different life forms (evergreen vs. deciduous), the relationship between sprouting ability and topographical factors, and the relationship between sprouting ability and species diversity. The results revealed that 197 species belonging to 137 genera in 59 families showed sprouting ability, with species, families, and genera accounting for 86.8%, 93.7%, and 91.3% of the total plant species in the plot, respectively. Sprouting occurred in most species in the plot, with Luculia intermedia, Rubovietnamia aristata, Pyracantha fortuneana, and Lindera communis exhibiting high sprouting ability. There were significant differences in the sprouting ability of the evergreen and deciduous groups, with the evergreen group showing a significantly higher sprouting ability than the deciduous group. Both the richness proportion of sprouting species and the abundance proportion of sprouting species were significantly positively correlated to the biodiversity index of the community. There were significantly negative correlations between sprouting ability and soil thickness, and significantly positive correlations between sprouting ability and convexity. In addition, the richness proportion of sprouting species was also positively correlated with elevation, while the abundance proportion of sprouting species was positively correlated with rock exposure rate and slope. Therefore, sprouting is considered a dominant renewal method in the community renewal of the Mulun plot; moreover, it can increase the biodiversity of the forest community. Finally, sprouting ability and certain topographical factors are significantly correlated.