Abstract: The form.Quercus phillyraeoides and form.Machilus oreophila,Distylium buxifollus on the north Jiulongjiang River valley were preliminarily investigated.The results shows that both of the formations are related to the typical xerophytia in dry region,It seems that they belong to the catagory of xeromorphic vegetation,In subtropical region of East China,xerophytia occurs on drier habitat.

Key words: North Jiulongiiang River valley, Xerophytia, Hard-leaved oak forest

摘要： 对福建九龙江北溪流域的乌冈栎林及建楠、小叶蚊母树灌丛进行了初步研究。它们与典型的干旱植被有一定的联系,属于干旱植被的范畴。在我国东部湿润亚热带地区发生的这种植被是由于局部环境条件的恶劣所致。

关键词: 九龙江北溪流域, 干旱植被, 硬叶阔叶林