The photosynthetic characteristics of 15 different landscape tree species grown in Guiyang karst mountainous area was measured by Li-6400 photosynthesis determinator to study their photosynthetic physiological property and ecological adaptability and to provide a reference for selection and collocation of these landscape trees. The results showed that there was difference in the photosynthetic physiological property and ecological adaptability between 15 landscape trees. Sapindus, Alnus cremastogyne , Osmanthus fragrans and Michelia chapensis with higher photosynthetic rate, water use efficiency and light use efficiency can be selected for vegetation recovery in Guiyang karst mountainous area firstly. Micheliafulgens, Magnolia officinalis, Acer oblongum and Aceraceae fabri with poor adaptability can not be selected for vegetation recovery in Guiyang karst mountainous area. Seven other landscape tree species with the common ecological adaptability can be selected for vegetation recovery in Guiyang karst mountainous area too.%为了探明贵阳市郊喀斯特山地不同景观树种的光合生理特性及生态适应性,为其景观树种的选择与配置提供参考,以贵阳市郊生态环境十分脆弱的喀斯特山地不同景观树种为研究对象,利用Li-6400光合作用测定仪对其光合特性进行测定.结果表明:15种景观树种的光合特性及生态适应性存在一定差异,桂花、桤木、无患子、乐昌含笑4种景观树种具有较高的光合速率、水分利用效率和光能利用率,能较好地适应研究区的生态环境,可作为研究区植被恢复的首选树种；亮叶含笑、厚朴、飞蛾槭和红翅槭4种景观树种属于耗水型树种,其适应性最差,不宜作为研究区植被恢复树种；其余7种树种的生态适应性居中,也可作为喀斯特山地植被恢复的景观树种.
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