STUDY ON THE FULL USE OF PLANT RESOURCES OF DRY-HOT VALLEY IN YUNNAN

The dry-hot valley in Yunnan refer to both mountainous-hilly land and wide flat areas along Jinsha,Lancang and Nujiang valleys,distributed between 23°01'~27°20' of north latitude,and 85°45'~103°20' of east longitude,with elevation under 1 600 meters.In such areas,specific climate types and vegetation forms are established under the influence of both planetary circulation and topography,and there exist plants for some particular purposes,among which are plants for lac host and fibres,wild fruit trees and grass crops.Some of them,such as Phyllanthus emblica,Cajanus cajan,Zizyphus mauritiana are to be further exploited for their value of use.If used properly and reasonably,these plants can be renewed naturally and cultured for their capacity of regeneration,or otherwise,the results will be the exhaustion of plant resources and further soil erosion.