The effect of elevated CO2 , soil and atmospheric water deficit and seasonal phenology on leaf and ecosystem isoprene emission

Functional Plant Biology : FPB
Emiliano PegoraroC Barry Osmond

Abstract

Two cottonwood plantations were grown at different CO2 concentrations at the Biosphere 2 Laboratory in Arizona to investigate the response of isoprene emission to elevated [CO2] and its interaction with water deficits. We focused on responses due to seasonal variation and variation in the mean climate from one year to the next. In fall and in spring, isoprene emission rate showed a similar inhibition by elevated [CO2], despite an 8-10°C seasonal difference in mean air temperature. The overall response of isoprene emission to drought was also similar for observations conducted during the spring or fall, and during the fall of two different years with an approximate 5°C difference in mean air temperature. In general, leaf-level isoprene emission rates, measured at constant temperature and photon-flux density, decreased slightly, or remained constant during drought, whereas ecosystem-level isoprene emission rates increased. The uncoupling of ecosystem- and leaf-scale responses is not due to differential dependence on leaf area index (LAI) as LAI increased only slightly, or decreased, during the drought treatments at the same time that ecosystem isoprene emission rate increased greatly. Nor does the difference in isoprene emission ...Continue Reading

References

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Nov 1, 2002·The New Phytologist·Jürgen KreuzwieserJörg-Peter Schnitzler

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Citations

Aug 24, 2016·Proceedings of the National Academy of Sciences of the United States of America·Yuzhong Zhang, Yuhang Wang

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