Surface energy balance is an important part of the land-atmosphere interaction,which is of great sig-nificance for the study of energy exchange,water cycle,climate change and biodiversity.The Qinghai Lake wa-tershed is an important barrier for the ecological security of the Qinghai-Xizang Plateau,and the swamp wetland is the main ecosystem type in the basin.However,there has been little research on the energy balance of swamp wetlands in the Qinghai Lake watershed.Based on this,this study analyzed the variation characteristics of sur-face energy balance of alpine swamp wetland in Qinghai Lake watershed by using the observed data obtained from the Wayanshan site in 2019.The results show that the surface radiation flux of the swamp wetland at the Wayanshan site has seasonal variation characteristics,and the downward and upward shortwave radiation values are highest in spring and lowest in winter.The net radiation,upward and downward longwave radiation fluxes are the largest in summer,followed by spring and autumn,and the smallest in winter.The net radiation is main-ly consumed by latent heat flux and sensible heat flux,accounting for 60.6%and 35.3%of the annual effective energy,respectively.The effective energy is mainly consumed by latent heat flux in summer and autumn,and by sensible heat flux in winter and spring.Compared with other underlying surfaces of the Qinghai-Xizang Pla-teau,the surface latent heat flux consumes a larger proportion(>75%)of the effective energy in the swamp wet-land in summer and autumn.The annual surface energy closure rate of swamp wetlands was 0.69,and the clo-sure rates during the freezing and non-freezing periods were 0.51 and 0.74,respectively.
关键词
辐射平衡/能量平衡/闭合率/青海湖流域/沼泽湿地
Key words
radiation balance/energy balance/closure rate/Qinghai Lake watershed/swamp wetlands
维普
万方数据