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Modeling seasonal course of carbon fluxes and evapotranspiration in response to low temperature and moisture in a boreal Scots pine ecosystem

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  • Wu, Si Hong
  • Jansson, Per-Erik
  • Kolari, Pasi

Abstract

Environmental conditions act above and below ground, and regulate carbon fluxes and evapotranspiration. The productivity of boreal forest ecosystems is strongly governed by low temperature and moisture conditions, but the understanding of various feedbacks between vegetation and environmental conditions is still unclear. In order to quantify the seasonal responses of vegetation to environmental factors, the seasonality of carbon and heat fluxes and the corresponding responses for temperature and moisture in air and soil were simulated by merging a process-based model (CoupModel) with detailed measurements representing various components of a forest ecosystem in Hyytiälä, southern Finland. The uncertainties in parameters, model assumptions, and measurements were identified by generalized likelihood uncertainty estimation (GLUE). Seasonal and diurnal courses of sensible and latent heat fluxes and net ecosystem exchange (NEE) of CO2 were successfully simulated for two contrasting years. Moreover, systematic increases in efficiency of photosynthesis, water uptake, and decomposition occurred from spring to summer, demonstrating the strong coupling between processes. Evapotranspiration and NEE flux both showed a strong response to soil temperature conditions via different direct and indirect ecosystem mechanisms. The rate of photosynthesis was strongly correlated with the corresponding water uptake response and the light use efficiency. With the present data and model assumptions, it was not possible to precisely distinguish the various regulating ecosystem mechanisms. Our approach proved robust for modeling the seasonal course of carbon fluxes and evapotranspiration by combining different independent measurements. It will be highly interesting to continue using long-term series data and to make additional tests of optional stomatal conductance models in order to improve our understanding of the boreal forest ecosystem in response to climate variability and environmental conditions.

Suggested Citation

  • Wu, Si Hong & Jansson, Per-Erik & Kolari, Pasi, 2011. "Modeling seasonal course of carbon fluxes and evapotranspiration in response to low temperature and moisture in a boreal Scots pine ecosystem," Ecological Modelling, Elsevier, vol. 222(17), pages 3103-3119.
    • Handle: RePEc:eee:ecomod:v:222:y:2011:i:17:p:3103-3119
    DOI: 10.1016/j.ecolmodel.2011.05.023
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    References listed on IDEAS

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    1. Ben D. MacArthur & Richard O. C. Oreffo, 2005. "Bridging the gap," Nature, Nature, vol. 433(7021), pages 19-19, January.
    2. Svensson, Magnus & Jansson, Per-Erik & Gustafsson, David & Kleja, Dan Berggren & Langvall, Ola & Lindroth, Anders, 2008. "Bayesian calibration of a model describing carbon, water and heat fluxes for a Swedish boreal forest stand," Ecological Modelling, Elsevier, vol. 213(3), pages 331-344.
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    4. Norman, Josefine & Jansson, Per-Erik & Farahbakhshazad, Neda & Butterbach-Bahl, Klaus & Li, Changsheng & Klemedtsson, Leif, 2008. "Simulation of NO and N2O emissions from a spruce forest during a freeze/thaw event using an N-flux submodel from the PnET-N-DNDC model integrated to CoupModel," Ecological Modelling, Elsevier, vol. 216(1), pages 18-30.
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    1. Shuang Liu & Jianye Li & Xingyi Zhang, 2022. "Simulations of Soil Water and Heat Processes for No Tillage and Conventional Tillage Systems in Mollisols of China," Land, MDPI, vol. 11(3), pages 1-17, March.
    2. Wu, J. & Jansson, P.E. & van der Linden, L. & Pilegaard, K. & Beier, C. & Ibrom, A., 2013. "Modelling the decadal trend of ecosystem carbon fluxes demonstrates the important role of functional changes in a temperate deciduous forest," Ecological Modelling, Elsevier, vol. 260(C), pages 50-61.
    3. He, Hongxing & Jansson, Per-Erik & Svensson, Magnus & Meyer, Astrid & Klemedtsson, Leif & Kasimir, Åsa, 2016. "Factors controlling Nitrous Oxide emission from a spruce forest ecosystem on drained organic soil, derived using the CoupModel," Ecological Modelling, Elsevier, vol. 321(C), pages 46-63.

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