金沙江干热河谷植物区系和生态多样性的初步研究

对金沙江干热河谷中植物区系成分和生态多分的多样性进行了初步研究。研究显示，金沙江干热河谷虽然气候干燥，给植物的正常生长带来不利影响，但河谷所具有充沛的光、热因子却为许多热带、亚热带植物的生长提供了条件，而特殊的地理位置和地形也为许多植物物种的保存创造了有利条件，形成一些植物的保留地。其植物区系成分中热带成分占６７．２６％，高于中国、云南，以及滇中。生长型以草本植物为主，其所占比例超过半数；生活型以

A PRELIMINARY STUDY ON THE FLORA AND ECOLOGICAL DIVERSITY IN JINSHA RIVER DRY-HOT VALLEY

Jinsha River is the upper reaches of Yangtse River. The climate factors along the Jinsha River valley are very different from that in near areas, dry and hot are two main characters of the valley climate factors, The climate and the vegetation in this area are somewhat like that of savanna. 1004 species of plant(18 ferns, 986 seed plant including 172 planted species)are recorded in this area,and the flora diversity are studied according to its areal-types. The ecological diversity,including its growth form,life form and leaf form are studied. Herb and shrub,phaenerophyte,chamaephyte and therophyte, small-,micro-and middle- leaf are the main characteristics of the plants here, The Plants here are deeply influenced by the dry and hot climate factors,which can be reflected by the ecological characters and their formations.