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1. The 2018 European heatwave led to stem dehydration but not to consistent growth reductions in forests

Author

Salomón, Roberto L., Peters, Richard L., Zweifel, Roman, Sass-Klaassen, Ute G. W., Stegehuis, Annemiek I., Smiljanic, Marko, Poyatos, Rafael, Babst, Flurin, Cienciala, Emil, Fonti, Patrick, Lerink, Bas J. W., Lindner, Marcus, Martinez-Vilalta, Jordi, Mencuccini, Maurizio, Nabuurs, Gert-Jan, van der Maaten, Ernst, von Arx, Georg, Bär, Andreas, Akhmetzyanov, Linar, Balanzategui, Daniel, Bellan, Michal, Bendix, Jörg, Berveiller, Daniel, Blaženec, Miroslav, Čada, Vojtěch, Carraro, Vinicio, Cecchini, Sébastien, Chan, Tommy, Conedera, Marco, Delpierre, Nicolas, Delzon, Sylvain, Ditmarová, Ľubica, Dolezal, Jiri, Dufrêne, Eric, Edvardsson, Johannes, Ehekircher, Stefan, Forner, Alicia, Frouz, Jan, Ganthaler, Andrea, Gryc, Vladimír, Güney, Aylin, Heinrich, Ingo, Hentschel, Rainer, Janda, Pavel, Ježík, Marek, Kahle, Hans-Peter, Knüsel, Simon, Krejza, Jan, Kuberski, Łukasz, Kučera, Jiří, Lebourgeois, François, Mikoláš, Martin, Matula, Radim, Mayr, Stefan, Oberhuber, Walter, Obojes, Nikolaus, Osborne, Bruce, Paljakka, Teemu, Plichta, Roman, Rabbel, Inken, Rathgeber, Cyrille B. K., Salmon, Yann, Saunders, Matthew, Scharnweber, Tobias, Sitková, Zuzana, Stangler, Dominik Florian, Stereńczak, Krzysztof, Stojanović, Marko, Střelcová, Katarína, Světlík, Jan, Svoboda, Miroslav, Tobin, Brian, Trotsiuk, Volodymyr, Urban, Josef, Valladares, Fernando, Vavrčík, Hanuš, Vejpustková, Monika, Walthert, Lorenz, Wilmking, Martin, Zin, Ewa, Zou, Junliang, and Steppe, Kathy

Published
2022
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3. The 2018 European heatwave led to stem dehydration but not to consistent growth reductions in forests

Author

Salomón, Roberto Luis, Peters, Richard L., Zweifel, Roman, Sass-Klaassen, Ute G. W., Stegehuis, Annemiek I., Smiljanic, Marko, Poyatos, Rafael, Babst, Flurin, Cienciala, Emil, Fonti, Patrick, Lerink, Bas J. W., Lindner, Marcus, Martínez Vilalta, Jordi, Mencuccini, Maurizio, Nabuurs, Gert-Jan, van der Maaten, Ernst, von Arx, Georg, Bär, Andreas, Akhmetzyanov, Linar, Balanzategui, Daniel, Bellan, Michal, Bendix, Jörg, Berveiller, Daniel, Blaženec, Miroslav, Čada, Vojtěch, Carraro, Vinicio, Cecchini, Sébastien, Chan, Tommy, Conedera, Marco, Delpierre, Nicolas, Delzon, Sylvain, Ditmarová, Ľubica, Dolezal, Jiri, Dufrêne, Eric, Edvardsson, Johannes, Ehekircher, Stefan, Forner, Alicia, Frouz, Jan, Ganthaler, Andrea, Gryc, Vladimír, Güney, Aylin, Heinrich, Ingo, Hentschel, Rainer, Janda, Pavel, Ježík, Marek, Kahle, Hans-Peter, Knüsel, Simon, Krejza, Jan, Kuberski, Łukasz, Kučera, Jiří, Lebourgeois, François, Mikoláš, Martin, Matula, Radim, Mayr, Stefan, Oberhuber, Walter, Obojes, Nikolaus, Osborne, Bruce, Paljakka, Teemu, Plichta, Roman, Rabbel, Inken, Rathgeber, Cyrille B. K., Salmon, Yann, Saunders, Matthew, Scharnweber, Tobias, Sitková, Zuzana, Stangler, Dominik Florian, Stereńczak, Krzysztof, Stojanović, Marko, Střelcová, Katarína, Světlík, Jan, Svoboda, Miroslav, Tobin, Brian, Trotsiuk, Volodymyr, Urban, Josef, Valladares, Fernando, Vavrčík, Hanuš, Vejpustková, Monika, Walthert, Lorenz, Wilmking, Martin, Zin, Ewa, Zou, Junliang, Steppe, Kathy, Salomón, Roberto Luis, Peters, Richard L., Zweifel, Roman, Sass-Klaassen, Ute G. W., Stegehuis, Annemiek I., Smiljanic, Marko, Poyatos, Rafael, Babst, Flurin, Cienciala, Emil, Fonti, Patrick, Lerink, Bas J. W., Lindner, Marcus, Martínez Vilalta, Jordi, Mencuccini, Maurizio, Nabuurs, Gert-Jan, van der Maaten, Ernst, von Arx, Georg, Bär, Andreas, Akhmetzyanov, Linar, Balanzategui, Daniel, Bellan, Michal, Bendix, Jörg, Berveiller, Daniel, Blaženec, Miroslav, Čada, Vojtěch, Carraro, Vinicio, Cecchini, Sébastien, Chan, Tommy, Conedera, Marco, Delpierre, Nicolas, Delzon, Sylvain, Ditmarová, Ľubica, Dolezal, Jiri, Dufrêne, Eric, Edvardsson, Johannes, Ehekircher, Stefan, Forner, Alicia, Frouz, Jan, Ganthaler, Andrea, Gryc, Vladimír, Güney, Aylin, Heinrich, Ingo, Hentschel, Rainer, Janda, Pavel, Ježík, Marek, Kahle, Hans-Peter, Knüsel, Simon, Krejza, Jan, Kuberski, Łukasz, Kučera, Jiří, Lebourgeois, François, Mikoláš, Martin, Matula, Radim, Mayr, Stefan, Oberhuber, Walter, Obojes, Nikolaus, Osborne, Bruce, Paljakka, Teemu, Plichta, Roman, Rabbel, Inken, Rathgeber, Cyrille B. K., Salmon, Yann, Saunders, Matthew, Scharnweber, Tobias, Sitková, Zuzana, Stangler, Dominik Florian, Stereńczak, Krzysztof, Stojanović, Marko, Střelcová, Katarína, Světlík, Jan, Svoboda, Miroslav, Tobin, Brian, Trotsiuk, Volodymyr, Urban, Josef, Valladares, Fernando, Vavrčík, Hanuš, Vejpustková, Monika, Walthert, Lorenz, Wilmking, Martin, Zin, Ewa, Zou, Junliang, and Steppe, Kathy

Abstract

Altres ajuts: This work utilised the network of dendrometer observations established by the COST Action network STReESS (grant FP1106), Heatwaves exert disproportionately strong and sometimes irreversible impacts on forest ecosystems. These impacts remain poorly understood at the tree and species level and across large spatial scales. Here, we investigate the effects of the record-breaking 2018 European heatwave on tree growth and tree water status using a collection of high-temporal resolution dendrometer data from 21 species across 53 sites. Relative to the two preceding years, annual stem growth was not consistently reduced by the 2018 heatwave but stems experienced twice the temporary shrinkage due to depletion of water reserves. Conifer species were less capable of rehydrating overnight than broadleaves across gradients of soil and atmospheric drought, suggesting less resilience toward transient stress. In particular, Norway spruce and Scots pine experienced extensive stem dehydration. Our high-resolution dendrometer network was suitable to disentangle the effects of a severe heatwave on tree growth and desiccation at large-spatial scales in situ, and provided insights on which species may be more vulnerable to climate extremes.

Published
2022

4. Data from: The 2018 European heatwave led to stem dehydration but not to consistent growth reductions in forests

Author

Salomón, Roberto L., Peters, Richard L., Zweifel, Roman, Sass-Klaassen, Ute G.W., Stegehuis, Annemiek I., Smiljanic, Marko, Poyatos, Rafael, Babst, Flurin, Cienciala, Emil, Fonti, Patrick, Lerink, Bas J.W., Lindner, Marcus, Martinez-Vilalta, Jordi, Mencuccini, Maurizio, Nabuurs, Gert Jan, van der Maaten, Ernst, von Arx, Georg, Bär, Andreas, Akhmetzyanov, Linar, Balanzategui, Daniel, Bellan, Michal, Bendix, Jörg, Berveiller, Daniel, Blaženec, Miroslav, Čada, Vojtěch, Carraro, Vinicio, Cecchini, Sébastien, Chan, Tommy, Conedera, Marco, Delpierre, Nicolas, Delzon, Sylvain, Ditmarová, Ľubica, Dolezal, Jiri, Dufrêne, Eric, Edvardsson, Johannes, Ehekircher, Stefan, Forner, Alicia, Frouz, Jan, Ganthaler, Andrea, Gryc, Vladimír, Güney, Aylin, Heinrich, Ingo, Hentschel, Rainer, Janda, Pavel, Ježík, Marek, Kahle, Hans Peter, Knüsel, Simon, Krejza, Jan, Kuberski, Łukasz, Kučera, Jiří, Lebourgeois, François, Mikoláš, Martin, Matula, Radim, Mayr, Stefan, Oberhuber, Walter, Obojes, Nikolaus, Osborne, Bruce, Paljakka, Teemu, Plichta, Roman, Rabbel, Inken, Rathgeber, Cyrille B.K., Salmon, Yann, Saunders, Matthew, Scharnweber, Tobias, Sitková, Zuzana, Stangler, Dominik Florian, Stereńczak, Krzysztof, Stojanović, Marko, Střelcová, Katarína, Světlík, Jan, Svoboda, Miroslav, Tobin, Brian, Trotsiuk, Volodymyr, Urban, Josef, Valladares, Fernando, Vavrčík, Hanuš, Vejpustková, Monika, Walthert, Lorenz, Wilmking, Martin, Zin, Ewa, Zou, Junliang, Steppe, Kathy, Salomón, Roberto L., Peters, Richard L., Zweifel, Roman, Sass-Klaassen, Ute G.W., Stegehuis, Annemiek I., Smiljanic, Marko, Poyatos, Rafael, Babst, Flurin, Cienciala, Emil, Fonti, Patrick, Lerink, Bas J.W., Lindner, Marcus, Martinez-Vilalta, Jordi, Mencuccini, Maurizio, Nabuurs, Gert Jan, van der Maaten, Ernst, von Arx, Georg, Bär, Andreas, Akhmetzyanov, Linar, Balanzategui, Daniel, Bellan, Michal, Bendix, Jörg, Berveiller, Daniel, Blaženec, Miroslav, Čada, Vojtěch, Carraro, Vinicio, Cecchini, Sébastien, Chan, Tommy, Conedera, Marco, Delpierre, Nicolas, Delzon, Sylvain, Ditmarová, Ľubica, Dolezal, Jiri, Dufrêne, Eric, Edvardsson, Johannes, Ehekircher, Stefan, Forner, Alicia, Frouz, Jan, Ganthaler, Andrea, Gryc, Vladimír, Güney, Aylin, Heinrich, Ingo, Hentschel, Rainer, Janda, Pavel, Ježík, Marek, Kahle, Hans Peter, Knüsel, Simon, Krejza, Jan, Kuberski, Łukasz, Kučera, Jiří, Lebourgeois, François, Mikoláš, Martin, Matula, Radim, Mayr, Stefan, Oberhuber, Walter, Obojes, Nikolaus, Osborne, Bruce, Paljakka, Teemu, Plichta, Roman, Rabbel, Inken, Rathgeber, Cyrille B.K., Salmon, Yann, Saunders, Matthew, Scharnweber, Tobias, Sitková, Zuzana, Stangler, Dominik Florian, Stereńczak, Krzysztof, Stojanović, Marko, Střelcová, Katarína, Světlík, Jan, Svoboda, Miroslav, Tobin, Brian, Trotsiuk, Volodymyr, Urban, Josef, Valladares, Fernando, Vavrčík, Hanuš, Vejpustková, Monika, Walthert, Lorenz, Wilmking, Martin, Zin, Ewa, Zou, Junliang, and Steppe, Kathy

Abstract

Heatwaves exert disproportionately strong and sometimes irreversible impacts on forest ecosystems. These impacts remain poorly understood at the tree and species level and across large spatial scales. Here, we investigate the effects of the record-breaking 2018 European heatwave on tree growth and tree water status using a collection of high-temporal resolution dendrometer data from 21 species across 53 sites. Relative to the two preceding years, annual stem growth was not consistently reduced by the 2018 heatwave but stems experienced twice the temporary shrinkage due to depletion of water reserves. Conifer species were less capable of rehydrating overnight than broadleaves across gradients of soil and atmospheric drought, suggesting less resilience toward transient stress. In particular, Norway spruce and Scots pine experienced extensive stem dehydration. Our high-resolution dendrometer network was suitable to disentangle the effects of a severe heatwave on tree growth and desiccation at large-spatial scales in situ, and provided insights on which species may be more vulnerable to climate extremes., Heatwaves exert disproportionately strong and sometimes irreversible impacts on forest ecosystems. These impacts remain poorly understood at the tree and species level and across large spatial scales. Here, we investigate the effects of the record-breaking 2018 European heatwave on tree growth and tree water status using a collection of high-temporal resolution dendrometer data from 21 species across 53 sites. Relative to the two preceding years, annual stem growth was not consistently reduced by the 2018 heatwave but stems experienced twice the temporary shrinkage due to depletion of water reserves. Conifer species were less capable of rehydrating overnight than broadleaves across gradients of soil and atmospheric drought, suggesting less resilience toward transient stress. In particular, Norway spruce and Scots pine experienced extensive stem dehydration. Our high-resolution dendrometer network was suitable to disentangle the effects of a severe heatwave on tree growth and desiccation at large-spatial scales in situ, and provided insights on which species may be more vulnerable to climate extremes.

Published
2021

6. Energy partitioning and water use efficiency anomalies 2018 at Eddy-Covariance sites across ecosystems

Author

Graf, Alexander, Klosterhalfen, Anne, Konopka, Jan, De Ligne, Anne, Longdoz, Bernard, Mauder, Matthias, Ney, Patrizia, Rabbel, Inken, Rebmann, Corinna, Sachs, Torsten, Schmidt, Marius, Schrader, Frederik, Bernhofer, Christian, Vincke, Caroline, Völksch, Ingo, Weber, Stephan, Wille, Christian, Vereecken, Harry, Brümmer, Christian, Drüe, Clemens, Gottschalk, Pia, Grünwald, Thomas, Heinemann, Günther, Heinesch, Bernard, and Klatt, Janina

Subjects
ddc:550
Abstract

Droughts and heat waves deeply interact with the exchange of energy and matter between land surface and atmosphere. The conditions associated with a combined heat wave and drought can have positive or negative effects on the sensible heat flux (H), latent heat flux (LE), and net flux of CO2 (NEE). In return, while each of these fluxes can exert different local feedbacks on temperature, atmospheric humidity and soil moisture, all of them result in bulk heating of the troposphere (H and LE through direct local and indirect non-local heat transfer, and NEE through radiative forcing). H is positively affected by increased solar irradiation, but can be supressed by advection of warm air diminishing the gradient between surface and air temperature. Potential LE is positively affected by irradiation, temperature and water vapour pressure deficit, but actual LE can be suppressed by stomatal closure of plants and by reduced soil moisture from low rainfall and high past LE. NEE is the result of plant photosynthesis (GPP) and plant and soil respiration (R), both of which can be enhanced by high temperatures or irradiation, and suppressed by drought. Focusing on direct measurements mostly by a network of Eddy-Covariance (EC) stations of the ICOS (www.icosri.eu), TERENO (www.tereno.net) and other networks, we hypothesize that the net effect of the 2018 event at a site, and thus its feedback on global warming, depends on the balance between co-existing positive and negative effects of the combined heat wave and drought on the respective fluxes. Variables such as albedo, growing degreedays (GDD), soil moisture and ecosystem-level water use efficiency help to separate these co-existing positive and negative effects from each other. Preliminary results indicate different degrees of heterogeneity between sites fordifferent variables. As expected, reduced precipitation and soil moisture, as well as increased GDD, could be found at almost all sites in the affected region. NEE was mostly less negative, indicating a weaker sink or even a source forCO2, as expected from past studies on earlier events. The network density and number of site-years available now confirms that this was true for all major ecosystem types - forest, grassland and (rainfed) cropland, and resultedin increased atmospheric CO2 concentrations. However, notable exceptions occurred at elevated low mountain range sites and during early stages of the event, supporting the hypothesis of a balance between positive andnegative effects, where the former may prevail at strongly energy-limited sites with a usually large water surplus. H was mostly above-average, indicating that local heat production contributed to the event and was typically notsuppressed by warm air advection. LE as well as inferred GPP and R reacted most heterogeneously across sites, demonstrating the large discrepancy between potentially high fluxes due to high irradiation and temperature on theone hand, and suppression by water shortage on the other hand. Despite the variability in LE, its relation to NEE was such that ecosystem-level water use was less efficient than usual at the majority of sites through reduced CO2uptake.

Published
2019

10. Comparing ΔTmax Determination Approaches for Granier-Based Sapflow Estimations.

Author

Rabbel, Inken, Diekkrüger, Bernd, Voigt, Holm, and Neuwirth, Burkhard

Subjects
*ESTIMATION theory, *ENERGY dissipation, *ELECTRONIC probes, *FOREST hydrology, *FLUX (Energy)
Abstract

Granier-type thermal dissipation probes are common instruments for quantifying tree water use in forest hydrological studies. Estimating sapflow using Granier-type sapflow sensors requires determining the maximum temperature gradient (ΔTmax) between the heated probe and the reference probe below. ΔTmax represents a state of zero sap flux, which was originally assumed to occur each night leading to a ΔTmax determination on a daily basis. However, researchers have proven that, under certain conditions, sapflow may continue throughout the night. Therefore alternative approaches to determining ΔTmax have been developed. Multiple ΔTmax approaches are now in use; however, sapflow estimates remain imprecise because the empirical equation that transfers the raw temperature signal (ΔT) to sap flux density (Fd) is strongly sensitive to ΔTmax. In this study, we analyze the effects of different ΔTmax determination approaches on sub-daily, daily and (intra-)seasonal Fd estimations. On this basis, we quantify the uncertainty of sapflow calculations, which is related to the raw signal processing. We show that the ΔTmax determination procedure has a major influence on absolute ΔTmax values and the respective sap flux density computations. Consequently, the choice of the ΔTmax determination approach may be a significant source of uncertainty in sapflow estimations. [ABSTRACT FROM AUTHOR]

Published
2016
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