塔里木河流域下游植物区系及生态学研究

塔里木河流域下游地区植物有30科80属122种。以双子叶植物类群占优势，其中多年生草本植物在塔里木河流域下游植物中占多数。显示了物种形成是年轻的进化类型。生态类型以旱生植物为主。占总种数的52％，这足长期适应比较干旱的自然环境的结果。该区系的温带成分占优势。地中海成分也占有一定地位。这些区系成分的植物都是干旱区荒漠植物的代表。区系地理反映了物种演化过程的历史气候、地质变化动态。查清塔里木河流域下游植物资源的数量和分布区的变迁，为该地区的植物资源保护提供科学依据。

Florae and Their Ecological Characteristics in the Lower Reaches of Tarim River

There are 122 species,80 genera and 30 families in the lower reaches of Tarim River. They are dominantly composed of dicotyledons and their majority is perennial herbaceous plants. This reveals that in the region,the species succession is the type of young evolution and the ecotypes mainly consist of xerophytes,which accounts for 52% of all the species. This situation results from long adaptation to dry natural environments. In the flora composition the warm temperate florae occupy a dominant position and Mediterranean ones also take a certain position;the plants of these two are the representatives of desert plants in arid regions. The distribution of the florae reflects the dynamic climatic and geological changes during the species succession on a historical scale. The complete investigation of the plant resources and their distribution and succession in the region will provide the scientific basis for protecting the plant resources in the region.