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Peat bogs have accumulated more atmospheric carbon (C) than any other terrestrial ecosystem today. Most of this C is associated with peat moss ( Sphagnum) litter. Atmospheric nitrogen (N) deposition can decrease Sphagnum production, compromising the C sequestration capacity of peat bogs. The mechanisms underlying the reduced production are uncertain, necessitating multifactorial experiments., We investigated whether glasshouse experiments are reliable proxies for field experiments for assessing interactions between N deposition and environment as controls on Sphagnum N concentration and production. We performed a meta-analysis over 115 glasshouse experiments and 107 field experiments., We found that glasshouse and field experiments gave similar qualitative and quantitative estimates of changes in Sphagnum 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., Thus, although we need glasshouse experiments to study how interacting environmental factors affect the response of Sphagnum to increased N deposition, we need field experiments to properly quantify these effects. [ABSTRACT FROM AUTHOR]

Summary [ABSTRACT FROM AUTHOR]

Investigates the linear elongation and dry-matter production of three Sphagnum species during three consecutive growing seasons at a nutrient-poor mire in the southern Alps of Italy and on laboratory cultures. Path analysis of growth data; Comparison of growth data by two-way analysis of variance; Effect of mean temperature on growth; Periodic pattern of dry-matter production.