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    Carbon cycling in temperate grassland under elevated temperature

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    Author
    Jansen-Willems, Anne B.
    Lanigan, Gary
    Grunhage, Ludger
    Muller, Christoph
    Keyword
    carbon cycle
    temperate grassland
    soil surface temperature
    Date
    01/11/2016
    
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    URI
    http://hdl.handle.net/11019/1507
    Citation
    Jansen-Willems, A. B., Lanigan, G. J., Grünhage, L. and Müller, C. (2016), Carbon cycling in temperate grassland under elevated temperature. Ecology and Evolution, 6: 7856–7868. doi: 10.1002/ece3.2153
    Abstract
    An increase in mean soil surface temperature has been observed over the last century, and it is predicted to further increase in the future. The effect of increased temperature on ecosystem carbon fluxes in a permanent temperate grassland was studied in a long-term (6 years) field experiment, using multiple temperature increments induced by IR lamps. Ecosystem respiration (R-eco) and net ecosystem exchange (NEE) were measured and modeled by a modified Lloyd and Taylor model including a soil moisture component for R-eco (average R2 of 0.78) and inclusion of a photosynthetic component based on temperature and radiation for NEE (R2 = 0.65). Modeled NEE values ranged between 2.3 and 5.3 kg CO2 m−2 year−1, depending on treatment. An increase of 2 or 3°C led to increased carbon losses, lowering the carbon storage potential by around 4 tonnes of C ha−1 year−1. The majority of significant NEE differences were found during night-time compared to daytime. This suggests that during daytime the increased respiration could be offset by an increase in photosynthetic uptake. This was also supported by differences in δ13C and δ18O, indicating prolonged increased photosynthetic activity associated with the higher temperature treatments. However, this increase in photosynthesis was insufficient to counteract the 24 h increase in respiration, explaining the higher CO2 emissions due to elevated temperature.
    Funder
    Department of Agriculture, Food and the Marine, Ireland; Teagasc Walsh Fellowship Programme
    Grant Number
    RSF 10/SC/716
    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.1002/ece3.2210
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    Environment, Soils & Land Use
    Environment, Soils & Land Use
    Environment, Soils & Land Use

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