The effect of heat waves, elevated [CO2] and low soil water availability on northern red oak (Quercus rubra L.) seedlings
Identifieur interne : 000194 ( Main/Curation ); précédent : 000193; suivant : 000195The effect of heat waves, elevated [CO2] and low soil water availability on northern red oak (Quercus rubra L.) seedlings
Auteurs : Ingvar Bauweraerts [Belgique] ; Timothy M. Wertin [États-Unis] ; Maarten Ameye [Belgique] ; Mary Anne Mcguire [États-Unis] ; Robert O. Teskey [États-Unis] ; Kathy Steppe [Belgique]Source :
- Global Change Biology [ 1354-1013 ] ; 2013-02.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Changement climatique, Climat, Sécheresse.
English descriptors
- KwdEn :
- Carbon Dioxide (analysis), Carbon dioxide, Climate, Climate Change, Climate change, Drought, Global change, Growth, Heat, Hot Temperature, Increase, Inhibition, Medium enrichment, Photosynthesis, Plant juvenile growth stage, Quercus (growth & development), Quercus (physiology), Quercus rubra, Soil, Soils, Warming, Water, Water availability.
- MESH :
- chemical , analysis : Carbon Dioxide.
- growth & development : Quercus.
- physiology : Quercus.
- Climate Change, Hot Temperature, Soil, Water.
Abstract
The frequency and intensity of heat waves are predicted to increase. This study investigates whether heat waves would have the same impact as a constant increase in temperature with the same heat sum, and whether there would be any interactive effects of elevated [CO2] and soil moisture content. We grew Quercus rubra seedlings in treatment chambers maintained at either ambient or elevated [CO2] (380 or 700 μmol CO2 mol−1) with temperature treatments of ambient, ambient +3 °C, moderate heat wave (+6 °C every other week) or severe heat wave (+12 °C every fourth week) temperatures. Averaged over a 4‐week period, and the entire growing season, the three elevated temperature treatments had the same average temperature and heat sum. Half the seedlings were watered to a soil water content near field capacity, half to about 50% of this value. Foliar gas exchange measurements were performed morning and afternoon (9:00 and 15:00 hours) before, during and after an applied heat wave in August 2010. Biomass accumulation was measured after five heat wave cycles. Under ambient [CO2] and well‐watered conditions, biomass accumulation was highest in the +3 °C treatment, intermediate in the +6 °C heat wave and lowest in the +12 °C heat wave treatment. This response was mitigated by elevated [CO2]. Low soil moisture significantly decreased net photosynthesis (Anet) and biomass in all [CO2] and temperature treatments. The +12 °C heat wave reduced afternoon Anet by 23% in ambient [CO2]. Although this reduction was relatively greater under elevated [CO2], Anet values during this heat wave were still 34% higher than under ambient [CO2]. We concluded that heat waves affected biomass growth differently than the same amount of heat applied uniformly over the growing season, and that the plant response to heat waves also depends on [CO2] and soil moisture conditions.
Url:
DOI: 10.1111/gcb.12044
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<term>Climate change</term>
<term>Drought</term>
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<front><div type="abstract" xml:lang="en">The frequency and intensity of heat waves are predicted to increase. This study investigates whether heat waves would have the same impact as a constant increase in temperature with the same heat sum, and whether there would be any interactive effects of elevated [CO2] and soil moisture content. We grew Quercus rubra seedlings in treatment chambers maintained at either ambient or elevated [CO2] (380 or 700 μmol CO2 mol−1) with temperature treatments of ambient, ambient +3 °C, moderate heat wave (+6 °C every other week) or severe heat wave (+12 °C every fourth week) temperatures. Averaged over a 4‐week period, and the entire growing season, the three elevated temperature treatments had the same average temperature and heat sum. Half the seedlings were watered to a soil water content near field capacity, half to about 50% of this value. Foliar gas exchange measurements were performed morning and afternoon (9:00 and 15:00 hours) before, during and after an applied heat wave in August 2010. Biomass accumulation was measured after five heat wave cycles. Under ambient [CO2] and well‐watered conditions, biomass accumulation was highest in the +3 °C treatment, intermediate in the +6 °C heat wave and lowest in the +12 °C heat wave treatment. This response was mitigated by elevated [CO2]. Low soil moisture significantly decreased net photosynthesis (Anet) and biomass in all [CO2] and temperature treatments. The +12 °C heat wave reduced afternoon Anet by 23% in ambient [CO2]. Although this reduction was relatively greater under elevated [CO2], Anet values during this heat wave were still 34% higher than under ambient [CO2]. We concluded that heat waves affected biomass growth differently than the same amount of heat applied uniformly over the growing season, and that the plant response to heat waves also depends on [CO2] and soil moisture conditions.</div>
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<settlement type="city">Gand</settlement>
</placeName>
<orgName type="university">Université de Gand</orgName>
</affiliation>
</author>
<author><name sortKey="Anne Mcguire, Mary" sort="Anne Mcguire, Mary" uniqKey="Anne Mcguire M" first="Mary" last="Anne Mcguire">Mary Anne Mcguire</name>
<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Daniel B. Warnell School of Forestry and Natural Resources, University of Georgia</s1>
<s2>Athens, Georgia 30602</s2>
<s3>USA</s3>
<sZ>2 aut.</sZ>
<sZ>4 aut.</sZ>
<sZ>5 aut.</sZ>
</inist:fA14>
<country>États-Unis</country>
<wicri:noRegion>Athens, Georgia 30602</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Teskey, Robert O" sort="Teskey, Robert O" uniqKey="Teskey R" first="Robert O." last="Teskey">Robert O. Teskey</name>
<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Daniel B. Warnell School of Forestry and Natural Resources, University of Georgia</s1>
<s2>Athens, Georgia 30602</s2>
<s3>USA</s3>
<sZ>2 aut.</sZ>
<sZ>4 aut.</sZ>
<sZ>5 aut.</sZ>
</inist:fA14>
<country>États-Unis</country>
<wicri:noRegion>Athens, Georgia 30602</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Steppe, Kathy" sort="Steppe, Kathy" uniqKey="Steppe K" first="Kathy" last="Steppe">Kathy Steppe</name>
<affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Laboratory of Plant Ecology, Department of Applied Ecology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653</s1>
<s2>Ghent, 9000</s2>
<s3>BEL</s3>
<sZ>1 aut.</sZ>
<sZ>3 aut.</sZ>
<sZ>6 aut.</sZ>
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<country>Belgique</country>
<placeName><region type="province" nuts="2">Province de Flandre-Orientale</region>
<settlement type="city">Gand</settlement>
</placeName>
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</affiliation>
</author>
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<series><title level="j" type="main">Global change biology : (Print)</title>
<title level="j" type="abbreviated">Glob. chang. biol. : (Print)</title>
<idno type="ISSN">1354-1013</idno>
<imprint><date when="2013">2013</date>
</imprint>
</series>
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<seriesStmt><title level="j" type="main">Global change biology : (Print)</title>
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<idno type="ISSN">1354-1013</idno>
</seriesStmt>
</fileDesc>
<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Carbon dioxide</term>
<term>Climate</term>
<term>Climate change</term>
<term>Drought</term>
<term>Global change</term>
<term>Growth</term>
<term>Heat</term>
<term>Increase</term>
<term>Inhibition</term>
<term>Medium enrichment</term>
<term>Photosynthesis</term>
<term>Plant juvenile growth stage</term>
<term>Quercus rubra</term>
<term>Soils</term>
<term>Warming</term>
<term>Water availability</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Chaleur</term>
<term>Augmentation</term>
<term>Enrichissement milieu</term>
<term>Sol</term>
<term>Stade juvénile plante</term>
<term>Climat</term>
<term>Sécheresse</term>
<term>Changement global</term>
<term>Réchauffement</term>
<term>Changement climatique</term>
<term>Croissance</term>
<term>Inhibition</term>
<term>Photosynthèse</term>
<term>Dioxyde de carbone</term>
<term>Quercus rubra</term>
<term>Eau disponible</term>
</keywords>
<keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Climat</term>
<term>Sécheresse</term>
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<front><div type="abstract" xml:lang="en">The frequency and intensity of heat waves are predicted to increase. This study investigates whether heat waves would have the same impact as a constant increase in temperature with the same heat sum, and whether there would be any interactive effects of elevated [CO<sub>2</sub>
] and soil moisture content. We grew Quercus rubra seedlings in treatment chambers maintained at either ambient or elevated [CO<sub>2</sub>
] (380 or 700 μmol CO<sub>2</sub>
mol<sup>-1</sup>
) with temperature treatments of ambient, ambient +3 °C, moderate heat wave (+6 °C every other week) or severe heat wave (+12 °C every fourth week) temperatures. Averaged over a 4-week period, and the entire growing season, the three elevated temperature treatments had the same average temperature and heat sum. Half the seedlings were watered to a soil water content near field capacity, half to about 50% of this value. Foliar gas exchange measurements were performed morning and afternoon (9:00 and 15:00 hours) before, during and after an applied heat wave in August 2010. Biomass accumulation was measured after five heat wave cycles. Under ambient [CO<sub>2</sub>
] and well-watered conditions, biomass accumulation was highest in the +3 °C treatment, intermediate in the +6 °C heat wave and lowest in the +12 °C heat wave treatment. This response was mitigated by elevated [CO<sub>2</sub>
]. Low soil moisture significantly decreased net photosynthesis (A<sub>net</sub>
) and biomass in all [CO<sub>2</sub>
] and temperature treatments. The +12 °C heat wave reduced afternoon A<sub>net</sub>
by 23% in ambient [CO<sub>2</sub>
]. Although this reduction was relatively greater under elevated [CO<sub>2</sub>
], A<sub>net</sub>
values during this heat wave were still 34% higher than under ambient [CO<sub>2</sub>
]. We concluded that heat waves affected biomass growth differently than the same amount of heat applied uniformly over the growing season, and that the plant response to heat waves also depends on [CO<sub>2</sub>
] and soil moisture conditions.</div>
</front>
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<author><name sortKey="Mcguire, Mary Anne" sort="Mcguire, Mary Anne" uniqKey="Mcguire M" first="Mary Anne" last="Mcguire">Mary Anne Mcguire</name>
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<author><name sortKey="Teskey, Robert O" sort="Teskey, Robert O" uniqKey="Teskey R" first="Robert O." last="Teskey">Robert O. Teskey</name>
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<author><name sortKey="Wertin, Timothy M" sort="Wertin, Timothy M" uniqKey="Wertin T" first="Timothy M." last="Wertin">Timothy M. Wertin</name>
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<wicri:regionArea>Daniel B. Warnell School of Forestry and Natural Resources, University of Georgia, Georgia, 30602, Athens</wicri:regionArea>
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<term>Quercus (growth & development)</term>
<term>Quercus (physiology)</term>
<term>Soil</term>
<term>Water</term>
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<front><div type="abstract" xml:lang="en">The frequency and intensity of heat waves are predicted to increase. This study investigates whether heat waves would have the same impact as a constant increase in temperature with the same heat sum, and whether there would be any interactive effects of elevated [CO2] and soil moisture content. We grew Quercus rubra seedlings in treatment chambers maintained at either ambient or elevated [CO2] (380 or 700 μmol CO2 mol−1) with temperature treatments of ambient, ambient +3 °C, moderate heat wave (+6 °C every other week) or severe heat wave (+12 °C every fourth week) temperatures. Averaged over a 4‐week period, and the entire growing season, the three elevated temperature treatments had the same average temperature and heat sum. Half the seedlings were watered to a soil water content near field capacity, half to about 50% of this value. Foliar gas exchange measurements were performed morning and afternoon (9:00 and 15:00 hours) before, during and after an applied heat wave in August 2010. Biomass accumulation was measured after five heat wave cycles. Under ambient [CO2] and well‐watered conditions, biomass accumulation was highest in the +3 °C treatment, intermediate in the +6 °C heat wave and lowest in the +12 °C heat wave treatment. This response was mitigated by elevated [CO2]. Low soil moisture significantly decreased net photosynthesis (Anet) and biomass in all [CO2] and temperature treatments. The +12 °C heat wave reduced afternoon Anet by 23% in ambient [CO2]. Although this reduction was relatively greater under elevated [CO2], Anet values during this heat wave were still 34% higher than under ambient [CO2]. We concluded that heat waves affected biomass growth differently than the same amount of heat applied uniformly over the growing season, and that the plant response to heat waves also depends on [CO2] and soil moisture conditions.</div>
</front>
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