CheneBelgiqueV1, Main, Exploration, bibRecord, 000194

The effect of heat waves, elevated [CO2] and low soil water availability on northern red oak (Quercus rubra L.) seedlings

Identifieur interne : 000194 ( Main/Exploration ); précédent : 000193; suivant : 000195

The 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.

RBID : ISTEX:068E0768AD08B45E443B28E63D330138D884795F

Descripteurs français

Pascal (Inist)
- Augmentation, Chaleur, Changement climatique, Changement global, Climat, Croissance, Dioxyde de carbone, Eau disponible, Enrichissement milieu, Inhibition, Photosynthèse, Quercus rubra, Réchauffement, Sol, Stade juvénile plante, Sécheresse.
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:

https://api.istex.fr/document/068E0768AD08B45E443B28E63D330138D884795F/fulltext/pdf

DOI: 10.1111/gcb.12044

Affiliations:

Le document en format XML

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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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The effect of heat waves, elevated [CO2] and low soil water availability on northern red oak (Quercus rubra L.) seedlings

The effect of heat waves, elevated [CO2] and low soil water availability on northern red oak (Quercus rubra L.) seedlings

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Descripteurs français

English descriptors

Abstract

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