Interactive effects of elevated CO2 and soil fertility on isoprene emissions from Quercus robur

Possell, M and Heath, J and Nicholas Hewitt, C and Ayres, E and Kerstiens, Gerhard (2004) Interactive effects of elevated CO2 and soil fertility on isoprene emissions from Quercus robur. Global Change Biology, 10 (11). pp. 1835-1843. ISSN 1354-1013

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The effects of global change on the emission rates of isoprene from plants are not clear. A factor that can influence the response of isoprene emission to elevated CO2 concentrations is the availability of nutrients. Isoprene emission rate under standard conditions (leaf temperature: 30°C, photosynthetically active radiation (PAR): 1000 μmol photons m−2 s−1), photosynthesis, photosynthetic capacity, and leaf nitrogen (N) content were measured in Quercus robur grown in well-ventilated greenhouses at ambient and elevated CO2 (ambient plus 300 ppm) and two different soil fertilities. The results show that elevated CO2 enhanced photosynthesis but leaf respiration rates were not affected by either the CO2 or nutrient treatments. Isoprene emission rates and photosynthetic capacity were found to decrease with elevated CO2, but an increase in nutrient availability had the converse effect. Leaf N content was significantly greater with increased nutrient availability, but unaffected by CO2. Isoprene emission rates measured under these conditions were strongly correlated with photosynthetic capacity across the range of different treatments. This suggests that the effects of CO2 and nutrient levels on allocation of carbon to isoprene production and emission under near-saturating light largely depend on the effects on photosynthetic electron transport capacity.

Item Type:
Journal Article
Journal or Publication Title:
Global Change Biology
Uncontrolled Keywords:
?? biogenic hydrocarbon emissionelectron transport rateelevated co2isopreneopen top chambersphotosynthesisquercus roburresource allocationorganic-compound emissionsphotosynthetic acclimationsynthase activityleaf developmentcarbon-dioxideintact leavesgas-exch ??
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18 Jul 2008 10:43
Last Modified:
16 Jul 2024 08:08