[ABSTRACT] In arid inland river basin of China, the hydrological state has close relation ship with the ecological environment. They are not only depended on each other but influenced and interacted with each other, however the hydrological ecology functions and significance are varied in different region of upper middle and lower reacher. In order to promote rational utilization of the limited water resources and a steady increase of the economy, we should fully understand this functions and significance and set up the study method of ecological hydrology.
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