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  Estimating global carbon uptake by lichens and bryophytes with a process-based model

Porada, P., Weber, B., Elbert, W., Pöschl, U., & Kleidon, A. (2013). Estimating global carbon uptake by lichens and bryophytes with a process-based model. Biogeosciences, 10, 6989-6989. doi:10.5194/bg-10-6989-2013.

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Porada, Philipp1, Author           
Weber, B, Author
Elbert, W, Author
Pöschl, U, Author
Kleidon, Axel2, Author           
Affiliations:
1Land Surface Dynamics, Research Group Biospheric Theory and Modelling, Dr. A. Kleidon, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497791              
2Research Group Biospheric Theory and Modelling, Dr. A. Kleidon, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497761              

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 Abstract: Lichens and bryophytes are abundant globally and they may even form the dominant autotrophs in (sub)polar ecosystems, in deserts and at high altitudes. Moreover, they can be found in large amounts as epiphytes in old-growth forests. Here, we present the first process-based model which estimates the net carbon uptake by these organisms at the global scale, thus assessing their significance for biogeochemical cycles. The model uses gridded climate data and key properties of the habitat (e.g. disturbance intervals) to predict processes which control net carbon uptake, namely photosynthesis, respiration, water uptake and evaporation. It relies on equations used in many dynamical vegetation models, which are combined with concepts specific to lichens and bryophytes, such as poikilohydry or the effect of water content on CO2 diffusivity. To incorporate the great functional variation of lichens and bryophytes at the global scale, the model parameters are characterised by broad ranges of possible values instead of a single, globally uniform value. The predicted terrestrial net uptake of 0.34 to 3.3 Gt yr−1 of carbon and global patterns of productivity are in accordance with empirically-derived estimates. Considering that the assimilated carbon can be invested in processes such as weathering or nitrogen fixation, lichens and bryophytes may play a significant role in biogeochemical cycles.

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 Dates: 2013-08-232013-11-05
 Publication Status: Published online
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 Identifiers: Other: BGC1835
DOI: 10.5194/bg-10-6989-2013
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Title: Biogeosciences
  Other : Biogeosciences
Source Genre: Journal
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Publ. Info: Katlenburg-Lindau, Germany : Copernicus GmbH on behalf of the European Geosciences Union
Pages: - Volume / Issue: 10 Sequence Number: - Start / End Page: 6989 - 6989 Identifier: ISSN: 1726-4170
CoNE: https://pure.mpg.de/cone/journals/resource/111087929276006