Evapotranspiration Characteristics of Shrub Land and Alpine Meadow in Qaidam Basin

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  • 1. Key Laboratory of Desert and DesertificationNorthwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000GansuChina
    2. College of Resources and EnvironmentChengdu University of Information TechnologyChengdu 610225SichuanChina

Online published: 2024-10-25

Abstract

Qaidam Basin belongs to the alpine arid inland basinwhich is short of water resources and fragile in ecological environment. Evapotranspiration is the main way of water dissipation in the natural ecosystem. The study of its variation characteristics is of great significance to the rational development of regional water resources and ecological environment protection. In this studythe shrub land and alpine meadow in Qaidam Basin were taken as observation stationsand the actual evapotranspiration was calculated by using the flux data observed by eddy covariance in 2020. The change characteristics of actual evapotranspiration of different underlying surfaces in different time scales were analyzedand the correlation between meteorological factors and actual evapotranspiration was explored. The results showed that:(1The evapotranspiration process of shrub land and alpine meadow mainly concentrated in the growing seasonand the distribution was normalbut the variation range was differentand the actual daily and monthly evapotranspiration of alpine meadow was greater than those of shrub land. Among themthe average daily evapotranspiration of shrub land was 0. 48 mmand that of alpine meadow was 1. 28 mm. The evapotranspiration of shrub land peaked at 40. 47 mm in August and evapotranspiration of alpine meadow peaked in July at 88. 92 mm.2For different underlying surfacesthe variation trend of air temperature and soil temperature were roughly the samebut the vapor pressure deficit and wind speed had some differences. The actual daily evapotranspiration was significantly correlated with air temperaturesoil temperatureand vapor pressure deficitbut not much related to wind speedand the sensitivity of evapotranspiration to meteorological factors was different in each season. In additionthe evapotranspiration of alpine meadow was significantly correlated with the soil water content.3The variation characteristics of water consumption of different underlying surfaces showed that the underlying surface of shrub land was mainly characterized by water consumption in each monthand the water consumption was most serious in July and August. The underlying sur‐ face of the alpine meadow was mainly characterized by water absorption in AprilJuneand Novemberand reached the peak of water absorption in June. The underlying surface of the alpine meadow was dominated by water consumption in other monthswith the largest water consumption in July. This study discussed the actual evapotranspiration characteristics of shrub land and alpine meadow in Qaidam Basinin order to provide certain reference for the study of water cycle in this area.

Cite this article

WANG Yuanzheng, MA Qimin, JIA Xiaopeng . Evapotranspiration Characteristics of Shrub Land and Alpine Meadow in Qaidam Basin[J]. Plateau Meteorology, 0 : 1 . DOI: 10. 7522/j. issn. 1000-0534. 2022. 00055

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