Study on degradation problems and countermeasures of inland lakes on the mongolian plateau:the case of dalinuoer
[Objective]The Dalinuoer basin is located in the west of Kishkvale county,Chifeng city.It is an important component of the national key functional ecological zone of the Hunshandak desert in the northern sand prevention belt.The Dalinuoer is the fourth largest lake in Inner Mongolia.In the past 50 years,the Dalinuoer basin has experienced a series of problems such as grassland degradation,lake water shrinkage,and deterioration of lake water quality.[Methods]Using meteorological data,hydrological monitoring and water use data,optical remote sensing data,and atmospheric reanalysis data from the basin,an in-vestigation and attribution analysis of changes in the area and water level were conducted.Water use data and aerial water re-sources in the basin were comprehensively studied,and strategies and measures were proposed to address the degradation of Dalinuoer.[Results]The analysis result show that since the 21st century,the surface area of Dalinuoer has continuously shrunk by nearly 40 km2,the lake elevation has decreased by nearly 3 m,and the water volume has decreased from about 1.7 billion m3 before 2000 to 1.1 billion m3.The shrinkage of the lake surface has caused the continuous deterioration of lake water quality,presenting as Class V,with COD,NH4+-N,TN,and TP exceeding the standard.The analysis of meteorological changes in the basin shows that the annual average temperature in the basin is 2.61 ℃,showing a fluctuating upward trend with an increase rate of 0.43 ℃/10 a.The average annual precipitation in the basin is 281.97 mm,with a weak downward trend in precipitation over the years,and the trend of precipitation change is not significant.The average annual evapotranspiration of Dalinuoer is 1 037 mm,and the actual evapotranspiration on the water surface is showing an increasing trend.It can be seen that the temperature in the Dalinuoer basin shows a significant increasing trend,with little change in precipitation and an increasing trend in water sur-face evapotranspiration.[Conclusion]The proportion of production and domestic water use in the basin to the total water re-sources of the basin is less than 1％,and human activities have a relatively small impact on lake shrinkage.The shrinkage of Dalinuoer is mainly caused by climate factors,with rising temperatures and surface evaporation being important factors contribu-ting to the lake's surface shrinkage.Through the evaluation of air water resources in the Dalinuoer basin,it can be concluded that there is great potential for the development of air water resources.In the case of limited water-saving potential and low feasibility of cross basin water transfer,actively utilizing aerial water resources and improving the water conservation capacity of the basin are innovative and effective ways to solve the ecological and environmental problems related to the degradation of Dalinuoer and its basin
hydrologyecologyair water resourcesprecipitation enhancementwater resources conservationDalinuoerclimate changewater quality
万方数据
维普
