Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Interactive effects of elevated CO2 and soil fertility on isoprene emissions from Quercus robur
AU - Possell, M
AU - Heath, J
AU - Nicholas Hewitt, C
AU - Ayres, E
AU - Kerstiens, Gerhard
PY - 2004/11
Y1 - 2004/11
N2 - 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.
AB - 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.
KW - biogenic hydrocarbon emission
KW - electron transport rate
KW - elevated CO2
KW - isoprene
KW - open top chambers
KW - photosynthesis
KW - Quercus robur
KW - resource allocation
KW - ORGANIC-COMPOUND EMISSIONS
KW - PHOTOSYNTHETIC ACCLIMATION
KW - SYNTHASE ACTIVITY
KW - LEAF DEVELOPMENT
KW - CARBON-DIOXIDE
KW - INTACT LEAVES
KW - GAS-EXCHANGE
KW - TEMPERATURE
KW - GROWTH
KW - MODEL
U2 - 10.1111/j.1365-2486.2004.00845.x
DO - 10.1111/j.1365-2486.2004.00845.x
M3 - Journal article
VL - 10
SP - 1835
EP - 1843
JO - Global Change Biology
JF - Global Change Biology
SN - 1354-1013
IS - 11
ER -