Articles | Volume 16, issue 4
https://doi.org/10.5194/bg-16-903-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-16-903-2019
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
26 Feb 2019
Research article |
| 26 Feb 2019
| 26 Feb 2019
Examining the evidence for decoupling between photosynthesis and transpiration during heat extremes
ARC Centre of Excellence for Climate Extremes, Sydney, NSW
2052, Australia
Climate Change Research Centre, University of New South Wales, Sydney, NSW
2052, Australia
Belinda E. Medlyn
Hawkesbury Institute for the Environment, Western
Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia
Andrew J. Pitman
ARC Centre of Excellence for Climate Extremes, Sydney, NSW
2052, Australia
Climate Change Research Centre, University of New South Wales, Sydney, NSW
2052, Australia
John E. Drake
Forest and Natural Resources Management, SUNY-ESF, Syracuse, NY,
USA
Anna Ukkola
ARC Centre of Excellence for Climate Extremes, Canberra, ACT 2601, Australia
Research School of Earth Sciences, Australian National University, Canberra, ACT
2601, Australia
Anne Griebel
Climate Change Research Centre, University of New South Wales, Sydney, NSW
2052, Australia
Elise Pendall
Climate Change Research Centre, University of New South Wales, Sydney, NSW
2052, Australia
Suzanne Prober
CSIRO Ecosystem Sciences, Private Bag 5, Wembley,
WA 6913, Australia
Michael Roderick
ARC Centre of Excellence for Climate Extremes, Canberra, ACT 2601, Australia
Research School of Earth Sciences, Australian National University, Canberra, ACT
2601, Australia
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Short summary
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Earth Syst. Dynam., 12, 919–938, https://doi.org/10.5194/esd-12-919-2021, https://doi.org/10.5194/esd-12-919-2021, 2021
Short summary
Short summary
Groundwater can buffer the impacts of drought and heatwaves on ecosystems, which is often neglected in model studies. Using a land surface model with groundwater, we explained how groundwater sustains transpiration and eases heat pressure on plants in heatwaves during multi-year droughts. Our results showed the groundwater’s influences diminish as drought extends and are regulated by plant physiology. We suggest neglecting groundwater in models may overstate projected future heatwave intensity.
Rafael Poyatos, Víctor Granda, Víctor Flo, Mark A. Adams, Balázs Adorján, David Aguadé, Marcos P. M. Aidar, Scott Allen, M. Susana Alvarado-Barrientos, Kristina J. Anderson-Teixeira, Luiza Maria Aparecido, M. Altaf Arain, Ismael Aranda, Heidi Asbjornsen, Robert Baxter, Eric Beamesderfer, Z. Carter Berry, Daniel Berveiller, Bethany Blakely, Johnny Boggs, Gil Bohrer, Paul V. Bolstad, Damien Bonal, Rosvel Bracho, Patricia Brito, Jason Brodeur, Fernando Casanoves, Jérôme Chave, Hui Chen, Cesar Cisneros, Kenneth Clark, Edoardo Cremonese, Hongzhong Dang, Jorge S. David, Teresa S. David, Nicolas Delpierre, Ankur R. Desai, Frederic C. Do, Michal Dohnal, Jean-Christophe Domec, Sebinasi Dzikiti, Colin Edgar, Rebekka Eichstaedt, Tarek S. El-Madany, Jan Elbers, Cleiton B. Eller, Eugénie S. Euskirchen, Brent Ewers, Patrick Fonti, Alicia Forner, David I. Forrester, Helber C. Freitas, Marta Galvagno, Omar Garcia-Tejera, Chandra Prasad Ghimire, Teresa E. Gimeno, John Grace, André Granier, Anne Griebel, Yan Guangyu, Mark B. Gush, Paul J. Hanson, Niles J. Hasselquist, Ingo Heinrich, Virginia Hernandez-Santana, Valentine Herrmann, Teemu Hölttä, Friso Holwerda, James Irvine, Supat Isarangkool Na Ayutthaya, Paul G. Jarvis, Hubert Jochheim, Carlos A. Joly, Julia Kaplick, Hyun Seok Kim, Leif Klemedtsson, Heather Kropp, Fredrik Lagergren, Patrick Lane, Petra Lang, Andrei Lapenas, Víctor Lechuga, Minsu Lee, Christoph Leuschner, Jean-Marc Limousin, Juan Carlos Linares, Maj-Lena Linderson, Anders Lindroth, Pilar Llorens, Álvaro López-Bernal, Michael M. Loranty, Dietmar Lüttschwager, Cate Macinnis-Ng, Isabelle Maréchaux, Timothy A. Martin, Ashley Matheny, Nate McDowell, Sean McMahon, Patrick Meir, Ilona Mészáros, Mirco Migliavacca, Patrick Mitchell, Meelis Mölder, Leonardo Montagnani, Georgianne W. Moore, Ryogo Nakada, Furong Niu, Rachael H. Nolan, Richard Norby, Kimberly Novick, Walter Oberhuber, Nikolaus Obojes, A. Christopher Oishi, Rafael S. Oliveira, Ram Oren, Jean-Marc Ourcival, Teemu Paljakka, Oscar Perez-Priego, Pablo L. Peri, Richard L. Peters, Sebastian Pfautsch, William T. Pockman, Yakir Preisler, Katherine Rascher, George Robinson, Humberto Rocha, Alain Rocheteau, Alexander Röll, Bruno H. P. Rosado, Lucy Rowland, Alexey V. Rubtsov, Santiago Sabaté, Yann Salmon, Roberto L. Salomón, Elisenda Sánchez-Costa, Karina V. R. Schäfer, Bernhard Schuldt, Alexandr Shashkin, Clément Stahl, Marko Stojanović, Juan Carlos Suárez, Ge Sun, Justyna Szatniewska, Fyodor Tatarinov, Miroslav Tesař, Frank M. Thomas, Pantana Tor-ngern, Josef Urban, Fernando Valladares, Christiaan van der Tol, Ilja van Meerveld, Andrej Varlagin, Holm Voigt, Jeffrey Warren, Christiane Werner, Willy Werner, Gerhard Wieser, Lisa Wingate, Stan Wullschleger, Koong Yi, Roman Zweifel, Kathy Steppe, Maurizio Mencuccini, and Jordi Martínez-Vilalta
Earth Syst. Sci. Data, 13, 2607–2649, https://doi.org/10.5194/essd-13-2607-2021, https://doi.org/10.5194/essd-13-2607-2021, 2021
Short summary
Short summary
Transpiration is a key component of global water balance, but it is poorly constrained from available observations. We present SAPFLUXNET, the first global database of tree-level transpiration from sap flow measurements, containing 202 datasets and covering a wide range of ecological conditions. SAPFLUXNET and its accompanying R software package
sapfluxnetrwill facilitate new data syntheses on the ecological factors driving water use and drought responses of trees and forests.
Anna B. Harper, Karina E. Williams, Patrick C. McGuire, Maria Carolina Duran Rojas, Debbie Hemming, Anne Verhoef, Chris Huntingford, Lucy Rowland, Toby Marthews, Cleiton Breder Eller, Camilla Mathison, Rodolfo L. B. Nobrega, Nicola Gedney, Pier Luigi Vidale, Fred Otu-Larbi, Divya Pandey, Sebastien Garrigues, Azin Wright, Darren Slevin, Martin G. De Kauwe, Eleanor Blyth, Jonas Ardö, Andrew Black, Damien Bonal, Nina Buchmann, Benoit Burban, Kathrin Fuchs, Agnès de Grandcourt, Ivan Mammarella, Lutz Merbold, Leonardo Montagnani, Yann Nouvellon, Natalia Restrepo-Coupe, and Georg Wohlfahrt
Geosci. Model Dev., 14, 3269–3294, https://doi.org/10.5194/gmd-14-3269-2021, https://doi.org/10.5194/gmd-14-3269-2021, 2021
Short summary
Short summary
We evaluated 10 representations of soil moisture stress in the JULES land surface model against site observations of GPP and latent heat flux. Increasing the soil depth and plant access to deep soil moisture improved many aspects of the simulations, and we recommend these settings in future work using JULES. In addition, using soil matric potential presents the opportunity to include parameters specific to plant functional type to further improve modeled fluxes.
Lina Teckentrup, Martin G. De Kauwe, Andrew J. Pitman, and Benjamin Smith
Biogeosciences, 18, 2181–2203, https://doi.org/10.5194/bg-18-2181-2021, https://doi.org/10.5194/bg-18-2181-2021, 2021
Short summary
Short summary
The El Niño–Southern Oscillation (ENSO) describes changes in the sea surface temperature patterns of the Pacific Ocean. This influences the global weather, impacting vegetation on land. There are two types of El Niño: central Pacific (CP) and eastern Pacific (EP). In this study, we explored the long-term impacts on the carbon balance on land linked to the two El Niño types. Using a dynamic vegetation model, we simulated what would happen if only either CP or EP El Niño events had occurred.
Mengyuan Mu, Martin G. De Kauwe, Anna M. Ukkola, Andy J. Pitman, Teresa E. Gimeno, Belinda E. Medlyn, Dani Or, Jinyan Yang, and David S. Ellsworth
Hydrol. Earth Syst. Sci., 25, 447–471, https://doi.org/10.5194/hess-25-447-2021, https://doi.org/10.5194/hess-25-447-2021, 2021
Short summary
Short summary
Land surface model (LSM) is a critical tool to study land responses to droughts and heatwaves, but lacking comprehensive observations limited past model evaluations. Here we use a novel dataset at a water-limited site, evaluate a typical LSM with a range of competing model hypotheses widely used in LSMs and identify marked uncertainty due to the differing process assumptions. We show the extensive observations constrain model processes and allow better simulated land responses to these extremes.
Cited articles
Alexander, L., Zhang, X., Peterson, T., Caesar, J., Gleason, B., Klein Tank,
A., Haylock, M., Collins, D., Trewin, B., Rahimzadeh, F., Tagipour, A., Rupa
Kumar, K., Revadekar, J., Griffiths, G., Vincent, L., Stephenson, D. B.,
Burn, J., Aguilar, E., Brunet, M., Taylor, M., New, M., Zhai, P., Rusticucci,
M., and Vazquez-Aguirre, J. L.: Global observed changes in daily climate
extremes of temperature and precipitation, J. Geophys. Res.-Atmos., 111,
D05109, https://doi.org/10.1029/2005JD006290, 2006.
Ameye, M., Wertin, T. M., Bauweraerts, I., McGuire, M. A., Teskey, R. O., and
Steppe, K.: The effect of induced heat waves on Pinus taeda and
Quercus rubra seedlings in ambient and elevated CO2
atmospheres, New Phytol., 196, 448–461, 2012.
Berbigier, P., Bonnefond, J.-M., and Mellmann, P.: CO2 and water
vapour fluxes for 2 years above Euroflux forest site, Agricult. Forest
Meteorol., 108, 183–197, 2001.
Cernusak, L. A., Ubierna, N., Jenkins, M. W., Garrity, S. R., Rahn, T.,
Powers, H. H., Hanson, D. T., Sevanto, S., Wong, S. C., McDowell, N. G., and
Farquhar, G. D.: Unsaturation of vapour pressure inside leaves of two conifer
species, Sci. Rep., 8, 7667–7673, 2018.
Ciais, Ph., Reichstein, M., Viovy, N., Granier, A., Ogee, J., Allard, V.,
Aubinet, M., Buchmann, N., Bernhofer, Chr., Carrara, A., Chevallier, F., De
Noblet, N., Friend, A. D., Friedlingstein, P., Grünwald, T., Heinesch,
B., Keronen, P., Knohl, A., Krinner, G., and Loustau, D.: Europe-wide
reduction in primary productivity caused by the heat and drought in 2003,
Nature, 437, 529–533, https://doi.org/10.1038/nature03972, 2005.
Cleverly, J., Boulain, N., Villalobos-Vega, R., Grant, N., Faux, R., Wood,
C., Cook, P. G., Yu, Q., Leigh, A., and Eamus, D.: Dynamics of component
carbon fluxes in a semi-arid Acacia woodland, central Australia,
J. Geophys. Res.-Biogeo., 118, 1168–1185, 2013.
Coumou, D. and Robinson, A.: Historic and future increase in the global land
area affected by monthly heat extremes, Environ. Res. Lett., 8, 034018,
https://doi.org/10.1088/1748-9326/8/3/034018, 2013.
Cowan, I. R. and Farquhar, G. D.: Stomatal function in relation to leaf
metabolism and environment, in: Integration of Activity in the Higher Plant,
edited by: Jennings, D. H., Cambridge University Press, Cambridge, 471–505,
1977.
Curtis, E. M., Gollan, J., Murray, B. R., and Leigh, A.: Native microhabitats
better predict tolerance to warming than latitudinal macro-climatic variables
in arid-zone plants, J. Biogeogr., 43, 1156–1165, 2016.
De Kauwe, M. G., Medlyn, B. E., Zaehle, S., Walker, A. P., Dietze, M. C.,
Hickler, T., Jain, A. K., Luo, Y. , Parton, W. J., Prentice, I. C., Smith,
B., Thornton, P. E., Wang, S., Wang, Y. , Wårlind, D., Weng, E., Crous,
K. Y., Ellsworth, D. S., Hanson, P. J., Seok Kim, H., Warren, J. M., Oren,
R., and Norby, R. J. : Forest water use and water use efficiency at elevated
CO2: A model-data intercomparison at two contrasting temperate forest
FACE sites, Glob. Change Biol., 19, 1759–1779, 2013.
De Kauwe, M. G., Medlyn, B. E., Knauer, J., and Williams, C. A.: Ideas and
perspectives: how coupled is the vegetation to the boundary layer?,
Biogeosciences, 14, 4435–4453, https://doi.org/10.5194/bg-14-4435-2017,
2017.
De Kauwe, M. G.: mdekauwe/heat_extremes_decoupling: accepted (Version
v1.0), Zenodo, https://doi.org/10.5281/zenodo.2563373, 2019.
Dekker, S. C., Bouten, W., and Schaap, M. G.: Analysing forest transpiration
model errors with artificial neural networks, J. Hydrol., 246, 197–208,
2001.
Dekker, S. C., Groenendijk, M., Booth, B. B. B., Huntingford, C., and Cox, P.
M.: Spatial and temporal variations in plant water-use efficiency inferred
from tree-ring, eddy covariance and atmospheric observations, Earth Syst.
Dynam., 7, 525–533, https://doi.org/10.5194/esd-7-525-2016, 2016.
Dirmeyer, P. A., Gao, X., Zhao, M., Guo, Z. H., Oki, T., and Hanasaki, N.:
GSWP-2-multimodel analysis and implications for our perception of the land
surface, B. Am. Meteorol. Soc., 87, 1381–1397, 2006.
Donat, M. G., Pitman, A. J., and Seneviratne, S. I.: Regional warming of hot
extremes accelerated by surface energy fluxes, Geophys. Res. Lett., 44,
7011–7019, 2017.
Drake, J. E., Tjoelker, M. G., Aspinwall, M. J., Reich, P. B., Barton, C. V.,
Medlyn, B. E., and Duursma, R. A.: Does physiological acclimation to climate
warming stabilize the ratio of canopy respiration to photosynthesis?, New
Phytol., 211, 850–863, 2016.
Drake, J. E., Vårhammar, A., Kumarathunge, D., Medlyn, B. E., Pfautsch,
S., Reich, P. B., Tissue, D. T., Ghannoum, O., and Tjoelker, M. G.: A common
thermal niche among geographically diverse populations of the widely
distributed tree species Eucalyptus tereticornis: No evidence for
adaptation to climate-of-origin, Glob. Change Biol., 23, 5069–5082, 2017.
Drake, J. E., Tjoelker, M. G., Vårhammar, A., Medlyn, B. E., Reich, P.
B., Leigh, A., Pfautsch, S., Blackman, C. J., López, R., Aspinwall, M.
J., Crous, K. Y., Duursma, R. A., Kumarathunge D., De Kauwe, M. G., Jiang,
M., Nicotra, A. B., Tissue, D. T., Choat, B., Atkin, O. K., and Barton, C. V.
M.: Trees tolerate an extreme heatwave via sustained transpirational cooling
and increased leaf thermal tolerance, Glob. Change Biol., 24, 2390–2402,
2018.
Duursma, R. A., Barton, C. V. M., Lin, Y.-S., Medlyn, B. E., Eamus, D.,
Tissue, D. T., Ellsworth, D. S., and McMurtrie, R. E.: The peaked response of
transpiration rate to vapour pressure deficit in field conditions can be
explained by the temperature optimum of photosynthesis, Agr. Forest
Meteorol., 189–190, 2–10, 2014.
Eder, F., Schmidt, M., Damian, T., Träumner, K., and Mauder, M.:
Mesoscale Eddies Affect Near-Surface Turbulent Exchange: Evidence from Lidar
and Tower Measurements, J. Appl. Meteor. Climatol., 54, 189–206, 2015.
Fischer, E., Seneviratne, S., Lüthi, D., and Schär, C.: Contribution
of land-atmosphere coupling to recent European summer heat waves, Geophys.
Res. Lett., 34, L06707, https://doi.org/10.1029/2006GL029068, 2007.
Flach, M., Sippel, S., Gans, F., Bastos, A., Brenning, A., Reichstein, M.,
and Mahecha, M. D.: Contrasting biosphere responses to hydrometeorological
extremes: revisiting the 2010 western Russian heatwave, Biogeosciences, 15,
6067–6085, https://doi.org/10.5194/bg-15-6067-2018, 2018.
Foken, T.: The energy balance closure problem: an overview, Ecol. Appl., 18,
1351–1367, 2008.
Griebel, A., Bennett, L. T., Metzen, D., Cleverly, J., Burba, G., and Arndt,
S. K.: Effects of inhomogeneities within the flux footprint on the
interpretation of seasonal, annual, and interannual ecosystem carbon
exchange, Agr. Forest Meteorol., 221, 50–60, 2016.
Groenendijk, M., Dolman, A. J., Ammann, C., Arneth, A., Cescatti, A.,
Dragoni, D., Gash, J. H. C., Gianelle, D., Gioli, B., Kiely, G., Knohl, A.,
Law, B. E., Lund, M., Marcolla, B., Van Der Molen, M. K., Montagnani, L.,
Moors, E., Richardson, A. D., Roupsard, O., Verbeeck, H., and Wohlfahrt, G.:
Seasonal varia- tion of photosynthetic model parameters and leaf area index
from global Fluxnet eddy covariance data, J. Geophys. Res., 116, 1–18,
https://doi.org/10.1029/2011JG001742, 2011.
Hendricks-Franssen, H. J., Stöckli, R., Lehner, I., Rotenberg, E.,
Seneviratne, S. I.: Energy balance closure of eddy-covariance data: a
multisite analysis for European FLUXNET stations, Agr. Forest Meteorol., 150,
1553–1567, 2010.
Isaac, P., Cleverly, J., McHugh, I., van Gorsel, E., Ewenz, C., and Beringer,
J.: OzFlux data: network integration from collection to curation,
Biogeosciences, 14, 2903–2928, https://doi.org/10.5194/bg-14-2903-2017,
2017.
Jarvis, P. and McNaughton, K.: Stomatal control of transpiration: Scaling up
from leaf to region, JAdv. Ecol. Res., 15, 1–49, 1986.
Kala, J., De Kauwe, M. G., Pitman, A. J., Medlyn, B. E., Wang, Y.-P., Lorenz,
R., and Perkins-Kirkpatrick, S. E.: Impact of the representation of stomatal
conductance on model projections of heatwave intensity, Sci. Rep., 6, 1–7,
2016.
Katul, G. G., Palmroth, S., and Oren, R.: Leaf stomatal responses to vapour
pressure deficit under current and CO2-enriched atmosphere explained
by the economics of gas exchange, Plant Cell Environ., 32, 968–979, 2009.
Keenan T. F., Hollinger, D. Y., Bohrer, G., Dragoni, D., Munger, J. W.,
Schmid, H. P., Richardson, A. D., Keeling, B. C. D., Bacastow, R. B.,
Bainbridge, A. E., Ekdahl, C. A., Guenther, P. R., and Waterman, L. E. E. S.:
Increase in forest water-use efficiency as atmospheric carbon dioxide
concentrations rise, Nature, 499, 324–327, 2013.
Klein Tank, A. M. G., Zwiers, F. W., and Zhang, X.: Guidelines on Analysis of
extremes in a changing climate in support of informed decisions for
adaptation, Geneva, Switzerland, 2009.
Kowalski, A. S.: The boundary condition for vertical velocity and its
interdependence with surface gas exchange, Atmos. Chem. Phys., 17,
8177–8187, https://doi.org/10.5194/acp-17-8177-2017, 2017.
Knauer, J., Zaehle, S., Medlyn, B. E., Reichstein, M., Williams, C. A.,
Migliavacca, M., De Kauwe, M. G., Werner, C., Keitel, C., Kolari, P.,
Limousin, J.-M., and Linderson, M.-L.: Towards physiologically meaningful
water-use efficiency estimates from eddy covariance data, Glob. Change Biol.,
24, 694–710, 2017.
Kumarathunge, D. P., Medlyn, B. E., Drake, J. E., Tjoelker, M. G., Aspinwall,
M. J., Battaglia, M., Cano, F. J., Carter, K. R., Cavaleri, M. A., Cernusak,
L. A., Chambers, J. Q., Crous, K. Y., De Kauwe, M. G., Dillaway, D. N.,
Dreyer, E., Ellsworth, D. S., Ghannoum, O., Han, Q., Hikosaka, K. Jensen, A.
M., Kelly, J. W. G., Kruger, E. L., Mercado, L. M., Onoda, Y., Reich, P. B.,
Rogers, A., Slot, M., Smith, N. G., Tarvainen, L., Tissue, D. T., Togashi, H.
F., Tribuzy, E. S., Uddling, J., Vårhammar, A., Wallin, G., Warren, J.
M., and Way, D. A.: Acclimation and adaptation components of the temperature
dependence of plant photosynthesis at the global scale, New Phytol.,
https://doi.org/10.1111/nph.15668, online first, 2019.
Law, B. E., Falge, E., Gu, L., Baldocchi, D. D., Bakwin, P., Berbigier, P.,
Davis, K., Dolman, A. J., Falk, M., Fuentes, J. D., Goldstein, A., Granier,
A., Grelle, A., Hollinger, D., Janssens, I. A., Jarvis, P., Jensen, N. O.,
Katul, G., Mahli, Y., Matteucci, G., Meyers, T., Monson, R., Munger, W., and
Oechel, W.: Environmental controls over carbon dioxide and water vapor
exchange of terrestrial vegetation, Agr. For. Meteorol., 113, 97–120, 2002.
Lin, Y.-S., Medlyn, B. E., and Ellsworth, D. S.: Temperature responses of
leaf net photosynthesis: The role of component processes, Tree Physiol., 32,
219–231, 2012.
Lloyd, J.: Modeling stomatal responses to environment in Macadamia
integrifolia, Aust. J. Plant Physiol., 18, 649–660, 1991.
Lorenz, R., Jaeger, E. B., and Seneviratne, S. I.: Persistence of heat waves
and its link to soil moisture memory, Geophys. Res. Lett., 37, L09703,
https://doi.org/10.1029/2010GL042764, 2010.
Macfarlane, C.: Great Western Woodlands OzFlux: Australian and New Zealand
Flux Research and Monitoring, hdl: 102.100.100/14226, 2013.
McHugh, I. D., Beringer, J., Cunningham, S. C., Baker, P. J., Cavagnaro, T.
R., Mac Nally, R., and Thompson, R. M.: Interactions between nocturnal
turbulent flux, storage and advection at an “ideal” eucalypt woodland site,
Biogeosciences, 14, 3027–3050, https://doi.org/10.5194/bg-14-3027-2017,
2017.
Medlyn, B. E., Duursma, R. A., Eamus, D., Ellsworth, D. S., Prentice, I. C.,
Barton, C. V., Crous, K. Y., De Angelis, P., Freeman, M., and Wingate, L.:
Reconciling the optimal and empirical approaches to modelling stomatal
conductance, Glob. Change Biol., 17, 2134–2144, 2011.
Medlyn, B. E., De Kauwe, M. G., Lin, Y., Knauer, J., Duursma, R. A.,
Williams, C. A., Arneth, A., Clement, R., Isaac, P., Limousin, J., Linderson,
M., Meir, P., Martin-StPaul, N., and Wingate, L.: How do leaf and ecosystem
measures of water-use efficiency compare?, New Phytol., 216, 758–770, 2017.
Merbold, L., Ardö, J., Arneth, A., Scholes, R. J., Nouvellon, Y., de
Grandcourt, A., Archibald, S., Bonnefond, J. M., Boulain, N., Brueggemann,
N., Bruemmer, C., Cappelaere, B., Ceschia, E., El-Khidir, H. A. M., El-Tahir,
B. A., Falk, U., Lloyd, J., Kergoat, L., Le Dantec, V., Mougin, E., Muchinda,
M., Mukelabai, M. M., Ramier, D., Roupsard, O., Timouk, F., Veenendaal, E.
M., and Kutsch, W. L.: Precipitation as driver of carbon fluxes in 11 African
ecosystems, Biogeosciences, 6, 1027–1041,
https://doi.org/10.5194/bg-6-1027-2009, 2009.
Meyer, W., Kondrlovà, E., and Koerber, G.: Evaporation of perennial
semi-arid woodland in southeastern Australia is adapted for irregular but
common dry periods, Hydrol. Proc., 29, 3714–3726, 2015.
Miralles, D., van den Berg, M., Teuling, A., and de Jeu, R.: Soil
moisture-temperature coupling: A multiscale observational analysis, Geophys.
Res. Lett., 39, L21707, https://doi.org/10.1029/2012GL053703, 2012.
Miralles, D. G., Teuling, A. J., Van Heerwaarden, C. C., and de Arellano, J.
V.-G.: Mega-heatwave temperatures due to combined soil desiccation and
atmospheric heat accumulation, Nat. Geosci., 7, 345–349, 2014.
Oren, R., Sperry, J. S., Katul, G. G., Pataki, D. E., Ewers, B. E., Phillips,
N., and Schäfer, K. V.: Survey and synthesis of intra- and interspecific
variation in stomatal sensitivity to vapour pressure deficit, Plant Cell
Environ., 22, 1515–1526, https://doi.org/10.1046/j.1365-3040.1999.00513.x, 1999.
O'Sullivan, O. S., Heskel, M. A., Reich, P. B., Tjoelker, M. G., Weerasinghe,
L. K., Penillard, A., Zhu, L., Egerton, J. J., Bloomfield, K. J., Creek, D.,
Bahar, N. H., Griffin, K. L., Hurry, V., Meir, P., Turnbull, M. H., and
Atkin, O. K.: Thermal limits of leaf metabolism across biomes, Glob. Change
Biol., 23, 209–223, 2017.
Perkins, S., Alexander, L., and Nairn, J.: Increasing frequency, intensity
and duration of observed global heatwaves and warm spells, Geophys. Res.
Lett., 39, L20714, https://doi.org/10.1029/2012GL053361, 2012.
Perkins, S. E.: A review on the scientific understanding of heatwaves—their
measurement, driving mechanisms, and changes at the global scale, Atmos.
Res., 164, 242–267, 2015.
Rambal, S., Joffre, R., Ourcival, J., Cavender-Bares, J., and Rocheteau, A.:
The growth respiration component in eddy CO2 flux from a quercus ilex
mediterranean forest, Glob. Change Biol., 10, 1460–1469, 2004.
Rey, A., Pegoraro, E., Tedeschi, V., De Parri, I., Jarvis, P. G., and
Valentini, R.: Annual variation in soil respiration and its components in a
coppice oak forest in central Italy, Glob. Change Biol., 8, 851–866, 2002.
Sabbatini, S., Arriga, N., Bertolini, T., Castaldi, S., Chiti, T., Consalvo,
C., Njakou Djomo, S., Gioli, B., Matteucci, G., and Papale, D.: Greenhouse
gas balance of cropland conversion to bioenergy poplar short-rotation
coppice, Biogeosciences, 13, 95–113, https://doi.org/10.5194/bg-13-95-2016,
2016.
Schmid, H. P., Grimmond, C. S. B., Cropley, F., Offerle, B., and Su, H.-B.:
Measurements of CO2 and energy fluxes over a mixed hardwood forest in
the mid-western United States, Agr. Forest Meteorol., 103, 357–374, 2000.
Seneviratne, S. I., Luethi, D., Litschi, M., and Schaer, C.: Land-atmosphere
coupling and climate change in Europe, Nature, 443, 205–209, 2006.
Silberstein, R.: Gingin OzFlux: Australian and New Zealand Flux Research and
Monitoring, hdl: 102.100.100/22677, 2015.
Sillmann, J., Kharin, V. V., Zwiers, F. W., Zhang, X., and Bronaugh, D.:
Climate extremes indices in the CMIP5 multimodel ensemble: Part 2. Future
climate projections, J. Geophys. Res.-Atmos., 118, 2473–2493, 2013.
Sperry, J. S., Venturas, M. D., Anderegg, W. R., Mencuccini, M., Mackay, D.
S., Wang, Y., and Love, D. M.: Predicting stomatal responses to the
environment from the optimization of photosynthetic gain and hydraulic cost,
Plant Cell Environ., 40, 816–830, 2017.
Tatarinov, F., Rotenberg, E., Maseyk, K., Ogée, J., Klein, T., and Yakir,
D.: Resilience to seasonal heat wave episodes in a Mediterranean pine forest,
New Phytol., 210, 485–496, 2016.
Teuling, A. J., Seneviratne, S. I., Stöckli, R., Reichstein, M., Moors,
E., Ciais, P., Luyssaert, S., van den Hurk, B., Ammann, C., Bern- hofer, C.,
Dellwik, E., Gianelle, D., Gielen, B., Grünwald, T., Klumpp, K.,
Montagnani, L., Moureaux, C., Sottocornola, M., and Wohlfahrt, G.:
Contrasting response of European forest and grassland energy exchange to
heatwaves, Nat. Geosci., 3, 722–727, 2010.
Trewavas, A.: What is plant behaviour? Plant Cell Environ., 32, 606–616,
2009.
Ukkola, A. M., Haughton, N., De Kauwe, M. G., Abramowitz, G., and Pitman, A.
J.: FluxnetLSM R package (v1.0): a community tool for processing FLUXNET data
for use in land surface modelling, Geosci. Model Dev., 10, 3379–3390,
https://doi.org/10.5194/gmd-10-3379-2017, 2017.
Urban, J., Ingwers, M. W., McGuire, M. A., and Teskey, R. O.: Increase in
leaf temperature opens stomata and decouples net photosynthesis from stomatal
conductance in pinus taeda and populus deltoides × nigra, J. Exp.
Bot., 68, 1757–1767, 2017.
van Heerwaarden, C. C. and Teuling, A. J.: Disentangling the response of
forest and grassland energy exchange to heatwaves under idealized
land–atmosphere coupling, Biogeosciences, 11, 6159–6171,
https://doi.org/10.5194/bg-11-6159-2014, 2014.
von Buttlar, J., Zscheischler, J., Rammig, A., Sippel, S., Reichstein, M.,
Knohl, A., Jung, M., Menzer, O., Arain, M. A., Buchmann, N., Cescatti, A.,
Gianelle, D., Kiely, G., Law, B. E., Magliulo, V., Margolis, H., McCaughey,
H., Merbold, L., Migliavacca, M., Montagnani, L., Oechel, W., Pavelka, M.,
Peichl, M., Rambal, S., Raschi, A., Scott, R. L., Vaccari, F. P., van Gorsel,
E., Varlagin, A., Wohlfahrt, G., and Mahecha, M. D.: Impacts of droughts and
extreme-temperature events on gross primary production and ecosystem
respiration: a systematic assessment across ecosystems and climate zones,
Biogeosciences, 15, 1293–1318, https://doi.org/10.5194/bg-15-1293-2018,
2018.
von Caemmerer, S. and Evans, J. R.: Temperature responses of mesophyll
conductance differ greatly between species, Plant Cell Environ., 38,
629–637, 2015.
Weston, D. J. and Bauerle, W. L.: Inhibition and acclimation of C3
photosynthesis to moderate heat: a perspective from thermally contrasting
genotypes of Acer rubrum L. (red maple), Tree Physiol., 27, 1083–1092, 2007.
Williams, M., Bond, B., and Ryan, M.: Evaluating different soil and plant
hydraulic constraints on tree function using a model and sap flow data from
ponderosa pine, Plant Cell Amp. Environ., 24, 679–690, 2001.
Wilson, K., Goldstein, A., Falge, E., Aubinet, M., Baldocchi, D., Berbigier,
P., Bernhofer, C., Ceulemans, R., Dolman, H., Field, C., Grelle, A., Ibrom,
A., Law, B. E., Kowalski, A., Meyers, T., Moncrieff, J., Monson, R., Oechel,
W., Tenhunen, J., Valentini, R., and Verma, S.: Energy balance closure at
FLUXNET sites, Agr. Forest Meteorol., 113, 223–243, 2002.
Wohlfahrt, G., Haslwanter, A., Hörtnagl, L., Jasoni, R. L., Fenster-
maker, L. F., Arnone, J. A., and Hammerle, A.: On the consequences of the
energy imbalance for calculating surface conductance to water vapour, Agr.
Forest Meteorol., 149, 1556–1559, 2009.
Wolf, S., Eugster, W., Ammann, C., Häni, M., Zielis, S., Hiller, R.,
Stieger, J., Imer, D., Merbold, L., and Buchmann, N.: Contrasting response of
grassland versus forest carbon and water fluxes to spring drought in
Switzerland, Environ. Res. Lett., 8, 035007,
https://doi.org/10.1088/1748-9326/8/3/035007, 2013.
Wolf, A., Anderegg, W. R. L., and Pacala, S. W.: Optimal stomatal behavior
with competition for water and risk of hydraulic impairment, P. Natl. Acad.
Sci. USA, 113, E7222–E7230, https://doi.org/10.1073/pnas.1615144113, 2016
Yu, G.-R., Wen, X.-F., Sun, X.-M., Tanner, B. D., Lee, X., and Chen, J.-Y.:
Overview of Chinaflux and evaluation of its eddy covariance measurement, Agr.
Forest Meteorol., 137, 125–137, 2006.
Zhou, S., Yu, B., Huang, Y., and Wang, G.: The effect of vapor pressure
deficit on water use efficiency at the subdaily time scale, Geophys. Res.
Lett., 41, 5005–5013, https://doi.org/10.1002/2014GL060741, 2014.
Zhou, S., Yu, B., Huang, Y., and Wang, G.: Daily underlying water use
efficiency for AmeriFlux sites, J. Geophys. Res.-Biogeosci., 120, 887–902,
https://doi.org/10.1002/2015JG002947, 2015.
Zhu, L., Bloomfield, K. J., Hocart, C. H., Egerton, J. J. G., O'Sullivan, O.
S., Penillard, A., Weerasinghe, L. K., and Atkin, O. K.: Plasticity of
photosynthetic heat tolerance in plants adapted to thermally contrasting
biomes, Plant Cell Environ., 18, 1251–1262, 2018.
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Short summary
Recent experimental evidence suggests that during heat extremes, trees may reduce photosynthesis to near zero but increase transpiration. Using eddy covariance data and examining the 3 days leading up to a temperature extreme, we found evidence of reduced photosynthesis and sustained or increased latent heat fluxes at Australian wooded flux sites. However, when focusing on heatwaves, we were unable to disentangle photosynthetic decoupling from the effect of increasing vapour pressure deficit.
Recent experimental evidence suggests that during heat extremes, trees may reduce photosynthesis...
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