Abstract
Evapotranspiration is an important process in the water budget of an ecosystem. Quantifying the components of evapotranspiration is of great significance in revealing the ecohydrological process of alpine inland river basins. In this study, the evapotranspiration fluxes in the Shaliu River basin were classified by hydrogen and oxygen stable isotope technology and remote sensing technology. The results showed the following: (1) The average value of soil fractional evaporation (E1) in the summer of 2018 and 2019 was 7.59 mm and 2.10 mm, respectively. (2) The average ratio of soil evaporation (Esoil) in the summer of 2018 was 48.82%, 68.11%, 54.99%, respectively. The average ratio of Esoil in the summer of 2019 was 66.86%, 57.50%, 55.53%, respectively. The average value of Esoil in the summer of 2018 and 2019 was 42.84 mm and 35.36 mm, respectively. (3) The average ratio of vegetation transpiration (T) in the summer of 2018 was 51.18%, 31.89%, and 45.01%, respectively. The average ratio of T in the summer of 2019 was 33.14%, 42.50%, and 44.47%, respectively. The average value of T in the summer of 2018 and 2019 was 32.59 mm and 26.23 mm, respectively. Obviously, the soil fractionation was stronger in the summer of 2018 than that in the summer of 2019. At the same time, both soil evaporation and plant transpiration in summer 2018 were higher than those in summer 2019, and soil evaporation in the Shaliu River basin was greater than plant transpiration in summer during the study period. The results of this study can provide data reference for mastering the eco-hydrological process of the Shaliu River basin.
Highlights
Evapotranspiration (ET) plays an important role in the ecological hydrological cycle and is an important hydrological cycle link [1–3]
It is important to clarify that Esoil and T are of great significance to the regional eco-hydrological process and hydrological cycle process
The important thing was that previous studies are based on the calculation results of and the were mostly based on models to estimate vegetation transpiration at the site scale, observation site scale, and have not extended to was the watershed scale, because there there were certain uncertainties
Summary
Evapotranspiration (ET) plays an important role in the ecological hydrological cycle and is an important hydrological cycle link [1–3]. The above characteristics determine that the Shaliu River basin is an ideal area to carry out quantitative research on the partitioning of catchment evapotranspiration fluxes at the basin scale. Under the background of global warming, the hydrological cycle process of the Shaliu River basin has changed, which has a certain impact on water resources and the ecological environment [28,29,32]. China and important water body that maintains ecological security of the northeastnology to an study atmospheric precipitation, waterthe vapor sources, and runoff processes in ern Existing have used hydrogen and are oxygen isotope theQTP. There few stable reports on thetechnology partitioning to study atmospheric precipitation, water vapor sources, and runoff processes in the Qingof catchment evapotranspiration fluxes using stable isotopes. For the water cycle, hydrological process and of water resources protection and management in the alpine inland river of the QTP
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