Abstract: Xishuangbanna,the region where remains the vast virg int ropical forests in China,receives great at tentions from home and abroad.Studies from 1930s to 1990s in dicatedt hat Xishuang banna is characterized by its transit ional position from tropics to subtropics.Its special eco-environment and biocomponents are not only import ant in biolog ical evolut ion,but also essential for local economic development.

Key words: large aperture scintillometer, water and heat fluxes, farmland, footprint climatology