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Surface energy and water vapor fluxes observed on a megadune in the Badain Jaran Desert, China

Journal of Arid Land 2015年第5期7卷 579-589页

作者： HU Wenfeng WANG Nai'ang ZHAO Liqiang NING Kai ZHANG Xunhe SUN Jie Center for Climate Change and Hydrologic Cycle in Arid Region College of Earth and Environmental Science Lanzhou University College of Geographical Science and Tourism Xinjiang Normal University

The Badain Jaran Desert is the second-largest area of shifting sands in China. Our first measurements of the energy components and water vapor fluxes on a megadune using eddy covariance technology were taken from April 2012 to April 2013. The results indicate that the Iongwave and shortwave radiative fluxes exhibited large fluctuations and seasonal dynamics. The total radiative energy loss by Iongwave and shortwave radiation was greater on the megadune than from other underlying surfaces. The radiation partitioning was different in different seasons. The land-atmosphere interaction was primarily represented by the sensible heat flux. The average sensi- ble heat flux （40.1 W/m2） was much larger than the average latent heat flux （14.5 W/m2）. Soil heat flux played an important role in the energy balance. The mean actual evaporation was 0.41 mm/d, and the cumulative actual evaporation was approximately 150 mm/a. The water vapor would transport downwardly and appear as dew con- densation water. The amount of precipitation determined the actual evaporation. The actual evaporation was sup- posed to be equal to the precipitation on the megadune and the precipitation was difficult to recharge the ground- water. Our study can provide a foundation for further research on land-atmosphere interactions in this area.

关键词： eddy covariance technology energy and water vapor fluxes precipitation evaporation

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Relations between Carbon Dioxide Fluxes and Environmental Factors of Kobresia humilis Meadows and Potentilla fruticosa Meadows

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Frontiers in Biology 2007年第3期2卷 324-332页

作者： ZHAO Liang XU Shixiao LI Yingnian TANG Yanhong ZHAO Xinquan GU Song DU Mingyuan YU Guirui Northwest Plateau Institute of Biology Chinese Academy of ScienceXining 810001China National Institute for Environmental Studies TsukubaIbaraki 3050053Japan National Institute for Agro-Environmental Science TsukubaIbaraki 3058604Japan Institute of Geographic Sciences and Natural Resources Research Beijing 100101China Key Laboratory of Adaption and Evolution of Peatean Biota Northwest Institute of Plateau BiologyChinese Academy of SciencesXin’ging 810001China

Carbon dioxide fluxes of Kobresia humilis and Potentilla fruticosa shrub meadows,two typical ecosystems in the Qinghai-Tibet Plateau,were measured by eddy covari-ance technology and the data collected in August 2003 were employed to analyze the relations between carbon dioxide fluxes and environmental factors of the *** is the time when the two ecosystems reach their peak leaf area indexes and stay stable,and also the period when the net carbon absorptions of Kobresia humilis and Potentilla fruticosa shrub meadows reach 56.2 g C·m^(-2)and 32.6 g C·m^(-2),with their highest daily carbon dioxide absorp-tions standing at 12.7μmol·m^(-2)·s^(-1)and 9.3μmol·m^(-2)·s^(-1),and their highest carbon discharges at 5.1μmol·m^(-2)·s^(-1)and 5.7μmol·m^(-2)·s^(-1),*** the same photosynthetic photo flux densities(PPFD),the carbon dioxide-uptake rate of the Kobresia humilis meadow is higher than that of the Potentilla fruticosa shrub meadow;where the PPFD are higher than 1,200μmol·m^(-2)·s^(-1).The carbon dioxide uptake rates of the two ecosystems declined as air temperature increased,but the carbon dioxide uptake rate of the Kobresia humilis meadow decreased more quickly(-0.086)than that of the Potentilla fruticosa shrub meadow(-0.016).Soil moistures exert influence on the soil respirations and this varies with the vegetation *** daily carbon dioxide absorptions of the ecosystems increase with increased diurnal temperature differences and higher diurnal temperature differences result in higher carbon dioxide *** exists a negative correlation between the vegetation albedos and the carbon dioxide fluxes.

关键词： alpine meadow vegetation type net carbon dioxide exchange eddy covariance technology

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