庐山常绿阔叶、落叶阔叶混交林的植物区系地理研究

A STUDY ON FLORA GEOGRAPHY IN LUSHAN MOUNTAIN

常绿阔叶、落叶阔叶混交林是落叶阔叶林和常绿阔叶林之间的过渡类型，是中亚热带的地带性植被类型之一．在庐山，常绿阔叶、落叶阔叶混交林位于海拔７００～１０００ｍ之间，且分布面积狭小．该区系计有维管束植物２１４种，分属１３９属、７２科，以温带成分为主，其次为热带亚热带成分，具有明显的从亚热带向温带过渡的特征．该区系含有许多古老成分，表明在第四纪中晚更新世时期庐山还不具备形成冰川的气候条件．

he mixed broadleaf evergreen and deciduous forest is a transitional type from the deciduous broadleaf forest to the evergreen broadleaf forest, and it is one of the zonal vegetations. It can be found occasionally at the elevations of 700￣ 1 000m in Lushan mountain and is affected strongly by human activities. There are 72 families, 139 genus and 214 species of vascular plants in the forest in Lushan mountain. From the areal-types of families and genera of the carpophytes, the temperate components are the most abundant, while the tropical-subtropical components lie the second. It is shown that the mixed broadleaf evergreen and deciduous forest has an obvious tranSitional feature-from tropiCal-subtropical to temperate. Besides, the mixed broadleaf evergreen and deciduous forest in Lushan mountain contains a lot of paleo-taxa, so it is not thought that there were climatic conditions to form glacier in Q2 and Q3 in Lushan mountain.