NDLI: Evapotranspiration and energy balance dynamics of a semi-arid mountainous steppe and shrubland site in Northern Mongolia

Content Provider	Springer Nature Link
Author	Minderlein, Stefanie Menzel, Lucas
Copyright Year	2014
Abstract	The semi-arid forest-steppe ecotone in the Khentii Mountains in Northern Mongolia is characterized by southerly exposed steppe slopes, shrublands in the floodplain of river valleys and northerly exposed taiga slopes. Here, the freshwater for the downstreaming agricultural, rural and mining sectors is generated. To gain insight into the main water-generating sources in mountainous river basins, we studied the actual evapotranspiration (ET) and its main influencing eco-hydrometeorological parameters at a steppe and a shrubland site during the growing season 2012. Latent (LE) and sensible (H) heat fluxes were measured using the Bowen ratio energy balance method, and the surface soil heat flux (G $_{0}$) was determined with the PlateCal and GradCal approach. During water-stressed soil conditions at the steppe site, volumetric water content (VWC) values of 0.05 m$^{3}$ m$^{−3}$ (−10 cm) resulted in significant limitations of the mean actual ET rates to 0.4 mm day$^{−1}$. In contrast, high VWC with maxima of >0.4 m$^{3}$ m$^{−3}$ and high mean actual ET rates >6.0 mm day$^{−1}$ were observed during water-unstressed soil conditions. As precipitation and change of stored soil moisture were approximately equal to actual ET, the contribution of freshwater from mountainous steppe within the forest-steppe ecotone can be neglected. At the shrubland site, which is underlain by a shallow aquifer system, VWC remained relatively constant with mean values of 0.4 m$^{3}$ m$^{−3}$ (−10 cm). A multiple regression analysis indicated that actual ET, with mean rates of 2.3 mm day$^{−1}$, was not significantly limited by precipitation and VWC, but by net radiation (R $_{n}$) and air temperature. As precipitation exceeded total actual ET, shrub covered river floodplains can contribute to freshwater generation.
Starting Page	593
Ending Page	609
Page Count	17
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	73
Issue Number	2
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-06-26
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Steppe Shrubland Semi-arid Water availability Bowen ratio energy balance method Actual evapotranspiration Soil–water limitation Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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