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Glasshouse vs field experiments: do they yield ecologically similar results for assessing N impacts on peat mosses?
Auteur(s)
Limpens, J.
Granath, G.
Aerts, R.
Heijmans, M. M. P. D.
Sheppard, L. J.
Bragazza, L.
Williams, B. L.
Rydin, H.
Bubier, J.
Moore, T.
Rochefort, L.
Buttler, A.
van den Berg, L. J. L.
Gunnarsson, U.
Francez, A. -J.
Gerdol, R.
Thormann, M.
Grosvernier, P.
Wiedermann, M. M.
Nilsson, M. B.
Hoosbeek, M. R.
Bayley, S.
Nordbakken, J. -F.
Paulissen, M. P. C. P.
Hotes, S.
Breeuwer, A.
Ilomets, M.
Tomassen, H. B. M.
Leith, I.
Xu, B.
Date de parution
2012
In
New Phytologist, Wiley, 2012/195/2/408-418
Résumé
<br> • Peat bogs have accumulated more atmospheric carbon (C) than any other terrestrial ecosystem today. Most of this C is associated with peat moss (<i>Sphagnum</i>) litter. Atmospheric nitrogen (N) deposition can decrease <i>Sphagnum</i> production, compromising the C sequestration capacity of peat bogs. The mechanisms underlying the reduced production are uncertain, necessitating multifactorial experiments. <br> • We investigated whether glasshouse experiments are reliable proxies for field experiments for assessing interactions between N deposition and environment as controls on <i>Sphagnum</i> N concentration and production. We performed a meta-analysis over 115 glasshouse experiments and 107 field experiments. <br> • We found that glasshouse and field experiments gave similar qualitative and quantitative estimates of changes in <i>Sphagnum</i> N concentration in response to N application. However, glasshouse-based estimates of changes in production – even qualitative assessments – diverged from field experiments owing to a stronger N effect on production response in absence of vascular plants in the glasshouse, and a weaker N effect on production response in presence of vascular plants compared to field experiments. <br> • Thus, although we need glasshouse experiments to study how interacting environmental factors affect the response of <i>Sphagnum</i> to increased N deposition, we need field experiments to properly quantify these effects.
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Type de publication
journal article
