Arid
DOI10.1002/hyp.10934
Remote sensing and ground-based measurements of evapotranspiration in an extreme cold Patagonian desert
Cristiano, P. M.1; Pereyra, D. A.2,3; Bucci, S. J.2,3; Madanes, N.1; Scholz, F. G.2,3; Goldstein, G.1,4
通讯作者Cristiano, P. M.
来源期刊HYDROLOGICAL PROCESSES
ISSN0885-6087
EISSN1099-1085
出版年2016
卷号30期号:24页码:4449-4461
英文摘要

Accurate estimates of seasonal evapotranspiration (ET) at different temporal and spatial scales are essential for understanding the biological and environmental determinants of ecosystem water balance in arid regions and the patterns of water utilization by the vegetation. For this purpose, remote sensing ET estimates of a Patagonian desert in Southern Argentina were verified with field measurements of soil evaporation and plant transpiration using an open top chamber. Root distribution and seasonal variation in soil volumetric water content were also analysed. There was a high correlation between remote sensing and field measurements of ecosystem water fluxes. A substantial amount of the annual ET occurred in spring and early summer (73.4 mm) using winter rain stored in the soil profile and resulting in water content depletion of the upper soil layers. A smaller amount of annual ET was derived from few rainfall events occurring during the mid or late summer (41.4 mm). According to remote sensing, the 92.9% of the mean annual precipitation returns to the atmosphere by transpiration or evaporation from the bare soil and by canopy interception. Only 7.1% infiltrates to soil layers deeper than 200 cm contributing to the water table recharge. Fourier time series analysis, cross-correlation methods and multiple linear regression models were used to analyse 11 years of remote sensing data to assess determinants of water fluxes. A linear model predicts well the variables that drive complex ecosystem processes such as ET. Leaf area index and air temperature were not linearly correlated to ET because of the multiple interaction among variables resulting in time lags with ET variations and thus these two variables were not included in the linear model. Soil water content, the fraction of photosynthetic active radiation and precipitation explained 86% of the ET monthly variations. The high volumetric water content and the small seasonal variations at 200-cm depth were probably the result of little water uptake from deeper soil horizons by roots with low hydraulic conductivity. Copyright (C) 2016 John Wiley & Sons, Ltd.


英文关键词MODIS precipitation pulses root distribution soil water content temperature water balance
类型Article
语种英语
国家Argentina ; USA
收录类别SCI-E
WOS记录号WOS:000388737900001
WOS关键词WATER ; MODIS ; RAINFALL ; INTERCEPTION ; SOIL ; EVAPORATION ; LOSSES ; SHRUBS ; FLUX
WOS类目Water Resources
WOS研究方向Water Resources
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/193462
作者单位1.Univ Buenos Aires, Lab Ecol Func, Dept Ecol Genet & Evoluc, Inst IEGEBA,CONICET,Fac Ciencias Exactas & Nat, Caba, Argentina;
2.Univ Nacl Patagonia SJB, Grp Estudios Biofis & Ecofisiol, Fac Ciencias Nat, Comodoro Rivadavia, Argentina;
3.Consejo Nacl Invest Cient & Tecn, RA-1033 Buenos Aires, DF, Argentina;
4.Univ Miami, Dept Biol, Coral Gables, FL 33124 USA
推荐引用方式
GB/T 7714
Cristiano, P. M.,Pereyra, D. A.,Bucci, S. J.,et al. Remote sensing and ground-based measurements of evapotranspiration in an extreme cold Patagonian desert[J],2016,30(24):4449-4461.
APA Cristiano, P. M.,Pereyra, D. A.,Bucci, S. J.,Madanes, N.,Scholz, F. G.,&Goldstein, G..(2016).Remote sensing and ground-based measurements of evapotranspiration in an extreme cold Patagonian desert.HYDROLOGICAL PROCESSES,30(24),4449-4461.
MLA Cristiano, P. M.,et al."Remote sensing and ground-based measurements of evapotranspiration in an extreme cold Patagonian desert".HYDROLOGICAL PROCESSES 30.24(2016):4449-4461.
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