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Seasonal and interannual variability of surface energy fluxes and evapotranspiration over a subalpine horizontal flow wetland in China
Agricultural and Forest Meteorology ( IF 6.2 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.agrformet.2020.107996 Chunhua Yan , Bei Wang , Jiao Xiang , Jie Du , Shanfa Zhang , Guo Yu Qiu
Agricultural and Forest Meteorology ( IF 6.2 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.agrformet.2020.107996 Chunhua Yan , Bei Wang , Jiao Xiang , Jie Du , Shanfa Zhang , Guo Yu Qiu
Abstract Jiuzhaigou Valley, a subalpine river valley located in the transition zone between the Tibetan Plateau and the Sichuan Basin, is characterized by fragile ecosystems, strong climate change, and high-intensity human activities which might have changed the energy and water exchange of the wetlands. However, little is known about the seasonal and interannual variability of the surface fluxes and their driving forces in these wetlands owing to the lack of long-term continuous observations. We studied the dynamics of surface fluxes and their controlling factors based on the five-year data collected from July 2013 to April 2019. Our results showed that: (1) the dominant turbulent flux in this ecosystem shifted from sensible heat flux (H) in the frozen period to latent heat flux (LE) in the non-frozen period, especially in the growth period. This fluctuation, which was also reflected by Bowen ratio, highlighted the seasonality of precipitation in the monsoon climate. (2) The energy partitioning with each year was similar across years: LE accounted for approximately 58% of the net radiation, while H accounted for 41% and ground heat flux accounted for 1%. (3) Although the annual precipitation fluctuated between 870 mm and 1089 mm, the interannual fluctuations in evapotranspiration (ET) were less than 41 mm. (4) The wetland ET was predominantly driven by atmospheric demand and was limited to some extent by physiological factors. We then concluded that official management efforts by the local government to increase vegetation cover as well as climate change may lead to an increase in wetland ET, and this change will likely affect local hydrology, climate and the existence of this unique hydrological landscape.
更新日期：2020-07-01
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