Photosynthetica 2009, 47(3):457-470 | DOI: 10.1007/s11099-009-0070-z

Modelling of carbon isotope discrimination by vegetation

D. Hidy1, L. Haszpra2, Z. Barcza3, A. Vermeulen4, Z. Tuba5, Z. Nagy1,*
1 Institute of Botany and Ecophysiology, Szent István University, Gödöllő, Hungary
2 Hungarian Meteorological Service, Budapest, Hungary
3 Department of Meteorology, Eötvös Loránd University, Budapest, Hungary
4 Department of. Air Quality & Climate Change, Energy Research Center of the Netherlands, Petten, The Netherlands
5 Plant Ecological Research Group at Botanical and Ecophysiological Institute, Gödöllő Páter 1., Hungary

The paper presents a simple box model simulating the temporal variation of atmospheric 13CO2 concentration, atmospheric CO2 mixing ratio and 13C content of plant material. The model is driven by observed meteorological and measured biosphere-atmosphere CO2 exchange data. The model was calibrated and validated using measurements from a Hungarian atmospheric monitoring station. The simulated atmospheric stable carbon isotope ratio data agreed well with the measured ratios considering both the magnitude and the seasonal dynamics. Observed deviations between the measured and simulated δ13Cair values were systematically negative in winters, while deviations were random in sign and smaller by an order of magnitude during periods when the vegetation was photosynthetically active. This difference, supported by a significant correlation between the deviation and modeled fossil fuel contributions to CO2 concentration, suggests the increased contribution of 13C-depleted fossil fuel CO2 from heating and the lower boundary layer heights during winter.

Additional key words: atmospheric modelling; 13C; carbon flux data; carbon isotope discrimination; carbon stable isotopes; discrimination

Received: February 27, 2009; Accepted: June 3, 2009; Published: September 1, 2009  Show citation

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Hidy, D., Haszpra, L., Barcza, Z., Vermeulen, A., Tuba, Z., & Nagy, Z. (2009). Modelling of carbon isotope discrimination by vegetation. Photosynthetica, 47(3), 457-470. doi: 10.1007/s11099-009-0070-z
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