Analysis of ecological water demand in the lower reaches of The Cherchen River,Xinjiang,China
River ecological water demand,as a key factor in maintaining the health of river ecosystems,plays an active role in maintaining regional ecological security. The paper analyzed the ecological water demand in the study area based on remote sensing data from 1990 to 2017,using the lower Cherchen River in Xinjiang as the study area:The area of woodland in the Lower Chelsea River showed a decreasing trend from 1990 to 2017,with the area of woodland decreasing by 14. 4％ . Grassland area decreased by a total of 3. 5％ . The water area shows an increasing trend,with an increase of 419. 6％ in the water area;After the diversion of the Chelsea River,the area of vegetation within the old channel gradually declined and showed a significant degradation trend after 2010;Changes in vegetation cover have occurred mainly in the downstream section closer to Lake Taitmar,especially in the last 10 years,when the downstream section has shown an increase in vegetation cover,and vegetation has been restored on both sides of the downstream river and around the lake;Using the submersible evaporation method,the ecological water demand was calculated to be 225 million m3,the area quota method was calculated to be 192 million m3,and the combined ecological water demand was 208 million m3 . If the reed field and 60km above and 265 km below the reed field are calculated separately,the ecological water demand of the two is 109 million m3 and 0. 85 billion m3 respectively. The calculation results have important reference value for maintaining the ecological security of the green corridor of the lower Chelsea River and achieving the optimal allocation and efficient use of water resources in the basin.
Cherchen Riverland usevegetation coverecological water demand
万方数据
维普
