为探究石面、石-土交界面、土面3类小生境对黔中喀斯特次生林物种组成和叶功能性状的影响，分析不同生长型植物对异质小生境的响应机制与适应策略，以贵州天龙山喀斯特次生林为研究对象，比较3类小生境中次生林物种组成和叶功能性状的差异，分析乔木和灌木在小生境梯度上的变异模式。结果表明：不同小生境明显影响喀斯特次生林不同生长型物种组成，石面、石-土交界面、土面生境中分别有乔木10、12、11种，灌木15、8、11种（含种下等级，下同），其中，土面生境中窄叶柯(Lithocarpus confinis C. C. Huang ex Y. C. Hsu et H. W. Jen)重要值最高（35.80%）。与石面、石-土交界面生境相比，土面生境资源优化，常绿乔木重要值升高、优势度上升，落叶乔木重要值降低、优势度下降；与石面生境相比，石-土交界面生境中有46.7%的灌木物种消失，石-土交界面生境对灌木具有最强的环境筛选作用。区域内乔木和灌木叶功能性状分异明显，同一小生境下乔木叶面积、叶干物质含量、叶组织密度显著（P<0.05）高于灌木，而灌木叶厚度、叶绿素含量则更具优势。乔木和灌木叶功能性状变异系数处于中等水平（6.69%~75.46%），其中，石-土交界面生境中灌木叶面积的变异系数最大、叶绿素含量的变异系数最小。乔木和灌木叶功能性状在不同小生境中的相关性具有差异性，石面生境中乔木叶厚度与叶绿素含量呈极显著正相关（P<0.01），与比叶面积和叶组织密度呈极显著负相关；石-土交界面和土面生境中，乔木叶厚度均与叶组织密度呈极显著负相关，叶绿素含量与比叶面积呈极显著负相关；灌木叶功能性状的相关性在3类小生境中相对较稳定。综合研究结果显示：黔中喀斯特次生林物种组成和叶功能性状受异质小生境影响明显，乔木与灌木的响应模式及适应策略有明显区别：乔木一般采取资源获取型策略，灌木一般采取资源保守型策略。在喀斯特地区开展植被恢复与生物多样性保护时，应考虑小生境的异质性，根据不同生长型植物的适应性，科学地选择物种并配置空间。

To investigate the effects of three microhabitats of rock surface, rock-soil interface, and soil surface on the species composition and leaf functional traits of secondary forest in the karst of Central Guizhou, and to analyze the response mechanisms and adaptation strategies of different growth form. plants to heterogeneous microhabitats, the secondary forest in the karst of Tianlong Mountain in Guizhou was taken as research object, the difference  of  species composition and leaf functional traits of secondary forests in three microhabitats were compared, and the variation patterns of trees and shrubs along the gradient of microhabitats were analyzed. The results show that different microhabitats obviously affect the species composition of different growth forms in the karst secondary forest, and there are 10, 12, and 11 tree species, and 15, 8, and 11 shrub species （including infraspecies, the same below） in the rock surface, rock-soil interface, and soil surface habitats respectively. Among them, Lithocarpus confinis C. C. Huang ex Y. C. Hsu et H. W. Jen in the soil surface habitat has the highest importance value (35.80%). Compared with the rock surface and rock-soil interface habitats, the soil surface habitat exhibits better resource availability, with increases in importance value and dominance of evergreen trees and decreases in importance value and dominance of deciduous trees; compared with the rock surface habitat, 46.7% of shrub species disappear in the rock-soil interface habitat, indicating that the rock-soil interface habitat has the strongest environmental filtering effect on shrubs. There are obvious differences in leaf functional traits between trees and shrubs in the region, and within the same microhabitat, leaf area, leaf dry matter content, and leaf tissue density of trees are significantly (P<0.05) higher than those of shrubs, while shrubs have greater leaf thickness and chlorophyll content. The coefficients of variation of leaf functional traits of trees and shrubs are at moderate levels (6.69%-75.46%), among which, the coefficient of variation of leaf area of shrubs in the rock-soil interface habitat is the largest, while that of leaf chlorophyll content is the smallest. The correlations among leaf functional traits of trees and shrubs differ across microhabitats, and in the rock surface habitat, leaf thickness of trees shows an extremely significant  positive correlation (P<0.01) with leaf chlorophyll content, and an extremely significant negative correlation with specific leaf area and leaf tissue density; in the rock-soil interface and soil surface microhabitats, leaf thickness of trees shows an extremely significant negative correlation with leaf tissue density, and leaf chlorophyll content shows an extremely significant negative correlation with specific leaf area; the correlations among leaf functional traits of shrubs are relatively stable across the three microhabitats. The comprehensive research result shows that the species composition and leaf functional traits of secondary forest in the karst of Central Guizhou are obviously affected by heterogeneous microhabitats, and the response patterns and adaptation strategies of trees and shrubs are distinctly different: trees generally adopt a resource-acquisition strategy, while shrubs generally adopt a resource-conservation strategy. When carrying out vegetation restoration and biodiversity conservation in karst region, the heterogeneity of microhabitats should be considered, and species should be scientifically selected and spatially arranged according to the adaptability of different growth forms.