Effects of elevated CO2 on mature Sitka spruce

Lee, H.; Barton, Craig V. M.; Jarvis, P. G.

doi:10.1007/978-94-011-1797-5_37

Cited by 3 publications

(1 citation statement)

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“…(1994), may be important in the regulation of the responses of different ecosystems in a future double [CO2] world. Unfortunately, few experimental results from natural forest ecosystems ate available (Lee, Barton & Jarvis 1993;Wang, Kellotnaki & Laitinen 1995;Liu & Teskey 1995), although some hypotheses have been put forward on the basis of the tesponses of tree seedlings. Our expetimental site tnay well contribute to the parametrization of global change models, taking into account the important limitation of water stress.…”

Section: Discussionmentioning

confidence: 99%

Long‐term exposure to elevated [CO₂] in a natural Quercus ilex L. community: net photosynthesis and photochemical efficiency of PSII at different levels of water stress

Scarascia‐Mugnozza

Angelis

Matteucci

et al. 1996

Plant Cell & Environment

104

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Naturally grown trees of Mediterranean evergreen oak (Quercus ilex L.), representing the climax species of the region, were enclosed in six large open‐top chambers and exposed to ambient and elevated CO2 concentrations during a 3 year period. Maximum daily net photosynthetic rates measured at the two different CO2 concentrations were from 30 to 100% higher in elevated than in ambient [CO2] throughout the experimental period. The increase in maximum daily photosynthesis was also accompanied by a 93% rise in the apparent quantum yield of CO2 assimilation, measured during periods of optimum soil moisture conditions. Hence, no clear evidence of down‐regulation of net photosynthetic activity was found. Interactions between atmospheric CO2 concentration and plant water stress were studied by following the natural evolution of drought in different seasons and years. At each level of water stress, the maximum rate of carbon assimilation was higher in elevated than in ambient [CO2] by up to 100%. Analysis of in vivo chlorophyll fluorescence parameters in normal (21%) and low (2%) oxygen concentrations provided useful insights into the functioning and stability of the photosynthetic processes. The photochemical efficiency of PSII (Fv/Fm) progressively decreased as drought conditions became more evident; this trend was accentuated under elevated [CO2]. Thermal de‐excitation processes were possibly more significant under elevated than under ambient [CO2], in a combination of environmental stresses. This research suggests two possible conclusions: (i) a ‘positive’ interaction between elevated [CO2] and carbon metabolism can be obtained through relief of water stress limitation in the summer months, and (ii) elevated [CO2], under drought conditions, may also enhance the significance of slow‐relaxing quenching.

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Section: Discussionmentioning

confidence: 99%

Long‐term exposure to elevated [CO₂] in a natural Quercus ilex L. community: net photosynthesis and photochemical efficiency of PSII at different levels of water stress

Scarascia‐Mugnozza

Angelis

Matteucci

et al. 1996

Plant Cell & Environment

104

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Impact of Elevated CO2 on Physiology and Needle Morphology of Scots Pine (Pinus Sylvestris) Seedlings

Jach

Ceulemans

1997

Impacts of Global Change on Tree Physiology and Forest Ecosystems

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Seasonal trends of light‐saturated net photosynthesis and stomatal conductance of loblolly pine trees grown in contrasting environments of nutrition, water and carbon dioxide

Murthy

Zarnoch

Dougherty³

1997

Plant Cell & Environment

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Repeated measures analysis was used to evaluate the effect of long-term COj enhancement on seasonal trends of lightsaturated rates of net photosynthesis (A^at) and stomatal conductance to water vapour {g^^^) of 9-year-old lohloUy pine {Pinus taeda L.) trees grown in a 2 x 2 factorial experimental design of nutrition and water. A significant interaction effect of CO2 and nutrition on mean Ag^t was observed for juvenile foliage. Also, juvenile foliage exposed to +350 /imol mor' CO2 had a higher rate of increase of A^at between late summer and early autumn. This would lead to a greater potential for recharging carbohydrate reserves for winter. Mature foliage was affected by CO2, water and nutrient treatments in two ways. First, A^^t was significantly increased as a result of elevated CO2 in January, a period when stomatal conductance was only 47% of the maximum observed rate. Secondly, the rate of increase of A^^t from winter to early spring was accelerated as a result of both nutrient + water and + 350 ^mol mol"' CO2 treatments. This accelerated response resulted in a greater potential for photosynthate production during the period when growth initiation occurred. Nutrient, water or carbon dioxide treatments did not significantly alter trends \ng^._^^ for mature or juvenile foliage. A significant nutrition x CO2 interaction was observed for the mature foliage, suggesting that g^.^î ncreased with increasing CO2 and nutrition. These results may have important consequences for the determination of the water use efficiency of loblolly pine. In spite of lowg^^^j in the winter to early spring period, there was a substantial gain in A^at attributable to elevated CO2 concentrations.

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Effects of elevated CO2 on mature Sitka spruce

Cited by 3 publications

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Long‐term exposure to elevated [CO₂] in a natural Quercus ilex L. community: net photosynthesis and photochemical efficiency of PSII at different levels of water stress

Long‐term exposure to elevated [CO₂] in a natural Quercus ilex L. community: net photosynthesis and photochemical efficiency of PSII at different levels of water stress

Impact of Elevated CO2 on Physiology and Needle Morphology of Scots Pine (Pinus Sylvestris) Seedlings

Seasonal trends of light‐saturated net photosynthesis and stomatal conductance of loblolly pine trees grown in contrasting environments of nutrition, water and carbon dioxide

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Effects of elevated CO2 on mature Sitka spruce

Cited by 3 publications

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Long‐term exposure to elevated [CO2] in a natural Quercus ilex L. community: net photosynthesis and photochemical efficiency of PSII at different levels of water stress

Long‐term exposure to elevated [CO2] in a natural Quercus ilex L. community: net photosynthesis and photochemical efficiency of PSII at different levels of water stress

Impact of Elevated CO2 on Physiology and Needle Morphology of Scots Pine (Pinus Sylvestris) Seedlings

Seasonal trends of light‐saturated net photosynthesis and stomatal conductance of loblolly pine trees grown in contrasting environments of nutrition, water and carbon dioxide

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Long‐term exposure to elevated [CO₂] in a natural Quercus ilex L. community: net photosynthesis and photochemical efficiency of PSII at different levels of water stress

Long‐term exposure to elevated [CO₂] in a natural Quercus ilex L. community: net photosynthesis and photochemical efficiency of PSII at different levels of water stress