关键词: 硬叶常绿阔叶林, 群落外貌, 生活型, 生长型, 植物区系

Abstract:

 An unique scleromicrophyllous evergreen broadleaved community in the valley of Lancang (upper Mekong) River was recorded using the methodology of BraunBlanquet’s relevé. The plant community was nominated by Association Olea ferruginea, Pistacia weinmannifolia. It was mainly happened at altitude 1300m to 1900m above sea level along the river banks. Its physiognomy, life/growth form, and floristic components were summarized, depending fieldcollected releves. The results indicated community structure was relatively simple, with average species number of 18; Phanerophytes were the most common life form, and growth form was dominated by herbs; There were 116 vascular species, 39 families, and 84 genera in 15 relevés; Its flora had a tropical characteristics at family and genus level. This association was supposed to be a relic vegetation of paleomediterrean subtropical vegetation which is characterized by small and scelrophyllous leaves. With growing human impact of dams construction, this plant community type which remains and evolves in a narrow valley were worth of protection and further research.

Key words: Sclerophyllous evergreen broad-leaved forest, Physiognomy, Life form, Growth form, Flora