绿洲-荒漠生态脆弱带的研究

在分析了绿洲－荒漠生态脆弱带的性质、特点等以后，按照其毗邻绿洲的不同，探讨性地将它分为三类：（1）河岸林绿洲－荒漠脆弱带；（2）冲洪积扇绿洲－荒漠脆弱带；（3）湖沼和湖滨三角洲绿洲－荒漠脆弱带。由于其本身所具有的脆弱性，加上人类活动的强烈干扰，该区出现了以土地荒漠化为主的多种生态环境问题。针对这些问题，作者提出了若干治理建议。

Study in Desert-oasis Ecological Fragile Zone

Desert oasis ecological fragile zone is a ecotone with sensitive degeneration tendency which is controlled by both desert ecosystem and oasis ecosystem. It is important to prevent land desertification and help oases extend under a good hydraulic condition . The fluctuant vulnerability and interfacial fragility are the two major types of unstable form . The causes of oasis, landscape types, fragile degree and fragile characters are chosen as the criteria for classification of the desert oasis ecological fragile zone. With variant states, the natural environment, process of production and environment management sre found to be as a qualitative index system of assessing desert-oasis ecological fragile zone. After analyzing its characters, in this paper, according to oases' classificatory system, three general types are generalized, such as alluvial plain (or rive terrace) fragile zone , alluvial fan fragile zone and lacustrine plain(or delta) fragile zone. The classification and assessment systems are systematic, complete, objective and flexible to assess desert-oasis ecological fragile zone. It is tested to assess alluvial plain fragile zone along the Tarim River. Fragility and artificial disturbance cause many environment problems, especially land desertification. Some suggestions are put forward for dealing with these problems in this paper.