Evapotranspiration flux partitioning at a multi-species shrubland with stable isotopes of soil, plant, and atmosphere water pools

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Main Author:	Tonantzin Tarin
Format:	Artículo científico
Language:	en
Published:	Universidad Nacional Autónoma de México 2020
Subjects:	Biología Ecohydrology Keeling plots water availability subtropical ecosystem North American monsoon
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_version_	1876477756990029824
author	Tonantzin Tarin
author_facet	Tonantzin Tarin
contents	Evapotranspiration flux partitioning at a multi-species shrubland with stable isotopes of soil, plant, and atmosphere water pools Tonantzin Tarin Enrico A. Yépez Jaime Garatuza-Payan Julio C. Rodríguez Luis A. Méndez-Barroso Christopher J. Watts Enrique R. Vivoni Biología Ecohydrology Keeling plots water availability subtropical ecosystem North American monsoon Evapotranspiration is the second largest component of the hydrological cycle after rainfall precipitation in semiarid regions such as northwestern Mexico. In this study, we partitioned the evapotranspiration (ET) flux using stable isotopes of water in the soil-plant-atmosphere continuum in combination with eddy covariance flux measurements. We considered three methods for determining the isotopic composition of transpiration (δT): (1) isotopic steady state, (2) non-steady state, and (3) non-steady state weighting the relative importance of dominant species cover and accounting for the relative values of stomatal conductance. Three approaches of T/ET partitioning were estimated during several wet and dry days at the study site in Sonora, Mexico. The total ET flux was variable across years due to differences in precipitation amount between years. ET was lower during the drier-year and reached higher values during the wetter-year. Soil evaporation (E) dominated ET soon after large rain events (40 to 70 mm d–1 [DOY-196 and DOY-197] in 2008) but showed a rapid decrease in dominance as the soil surface dried. Estimated values of T/ET based on an isotopic mass balance were in the same range independent of three methods used. The mean T/ET ratio across all the periods studied was in the range of other studies in semiarid ecosystems and global trends with values of ~0.67 ± 0.02. This work contributes to a better understanding of the surface atmosphere interactions in semi-arid regions. 2020 artículo científico 0187-6236 https://www.redalyc.org/articulo.oa?id=56572282002 https://www.redalyc.org/journal/565/56572282002/ https://www.redalyc.org/journal/565/56572282002/html/ https://www.redalyc.org/journal/565/56572282002/56572282002.epub https://www.redalyc.org/journal/565/56572282002/movil 10.20937/ATM.52710 en http://www.redalyc.org/revista.oa?id=565 Atmósfera application/pdf Universidad Nacional Autónoma de México Atmósfera (México) Num.4 Vol.33
format	Artículo científico
id	redalyc_56572282002
institution	Redalyc
language	en
publishDate	2020
publisher	Universidad Nacional Autónoma de México
spellingShingle	Evapotranspiration flux partitioning at a multi-species shrubland with stable isotopes of soil, plant, and atmosphere water pools Tonantzin Tarin Biología Ecohydrology Keeling plots water availability subtropical ecosystem North American monsoon Evapotranspiration flux partitioning at a multi-species shrubland with stable isotopes of soil, plant, and atmosphere water pools Tonantzin Tarin Enrico A. Yépez Jaime Garatuza-Payan Julio C. Rodríguez Luis A. Méndez-Barroso Christopher J. Watts Enrique R. Vivoni Biología Ecohydrology Keeling plots water availability subtropical ecosystem North American monsoon Evapotranspiration is the second largest component of the hydrological cycle after rainfall precipitation in semiarid regions such as northwestern Mexico. In this study, we partitioned the evapotranspiration (ET) flux using stable isotopes of water in the soil-plant-atmosphere continuum in combination with eddy covariance flux measurements. We considered three methods for determining the isotopic composition of transpiration (δT): (1) isotopic steady state, (2) non-steady state, and (3) non-steady state weighting the relative importance of dominant species cover and accounting for the relative values of stomatal conductance. Three approaches of T/ET partitioning were estimated during several wet and dry days at the study site in Sonora, Mexico. The total ET flux was variable across years due to differences in precipitation amount between years. ET was lower during the drier-year and reached higher values during the wetter-year. Soil evaporation (E) dominated ET soon after large rain events (40 to 70 mm d–1 [DOY-196 and DOY-197] in 2008) but showed a rapid decrease in dominance as the soil surface dried. Estimated values of T/ET based on an isotopic mass balance were in the same range independent of three methods used. The mean T/ET ratio across all the periods studied was in the range of other studies in semiarid ecosystems and global trends with values of ~0.67 ± 0.02. This work contributes to a better understanding of the surface atmosphere interactions in semi-arid regions. 2020 artículo científico 0187-6236 https://www.redalyc.org/articulo.oa?id=56572282002 https://www.redalyc.org/journal/565/56572282002/ https://www.redalyc.org/journal/565/56572282002/html/ https://www.redalyc.org/journal/565/56572282002/56572282002.epub https://www.redalyc.org/journal/565/56572282002/movil 10.20937/ATM.52710 en http://www.redalyc.org/revista.oa?id=565 Atmósfera application/pdf Universidad Nacional Autónoma de México Atmósfera (México) Num.4 Vol.33
title	Evapotranspiration flux partitioning at a multi-species shrubland with stable isotopes of soil, plant, and atmosphere water pools
topic	Biología Ecohydrology Keeling plots water availability subtropical ecosystem North American monsoon
url	https://www.redalyc.org/articulo.oa?id=56572282002 https://www.redalyc.org/journal/565/56572282002/ https://www.redalyc.org/journal/565/56572282002/html/ https://www.redalyc.org/journal/565/56572282002/56572282002.epub https://www.redalyc.org/journal/565/56572282002/movil

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