Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/s12665-014-3335-1 |
Evapotranspiration and energy balance dynamics of a semi-arid mountainous steppe and shrubland site in Northern Mongolia | |
Minderlein, Stefanie; Menzel, Lucas | |
通讯作者 | Minderlein, Stefanie |
来源期刊 | ENVIRONMENTAL EARTH SCIENCES
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ISSN | 1866-6280 |
EISSN | 1866-6299 |
出版年 | 2015 |
卷号 | 73期号:2页码:593-609 |
英文摘要 | 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 ecohydrometeorological 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. |
英文关键词 | Steppe Shrubland Semi-arid Water availability Bowen ratio energy balance method Actual evapotranspiration Soil-water limitation |
类型 | Article |
语种 | 英语 |
国家 | Germany |
收录类别 | SCI-E |
WOS记录号 | WOS:000347446400009 |
WOS关键词 | SURFACE-WATER BALANCE ; INNER-MONGOLIA ; EDDY COVARIANCE ; WESTERN KHENTEY ; HOVSGOL AREA ; GRASSLAND ; PERMAFROST ; ECOSYSTEMS ; VEGETATION ; EXCHANGE |
WOS类目 | Environmental Sciences ; Geosciences, Multidisciplinary ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Geology ; Water Resources |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/186971 |
作者单位 | Heidelberg Univ, Inst Geog, Dept Hydrol & Climatol, D-69120 Heidelberg, Germany |
推荐引用方式 GB/T 7714 | Minderlein, Stefanie,Menzel, Lucas. Evapotranspiration and energy balance dynamics of a semi-arid mountainous steppe and shrubland site in Northern Mongolia[J],2015,73(2):593-609. |
APA | Minderlein, Stefanie,&Menzel, Lucas.(2015).Evapotranspiration and energy balance dynamics of a semi-arid mountainous steppe and shrubland site in Northern Mongolia.ENVIRONMENTAL EARTH SCIENCES,73(2),593-609. |
MLA | Minderlein, Stefanie,et al."Evapotranspiration and energy balance dynamics of a semi-arid mountainous steppe and shrubland site in Northern Mongolia".ENVIRONMENTAL EARTH SCIENCES 73.2(2015):593-609. |
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