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| Titel |
Global-scale pattern of peatland Sphagnum growth driven by photosynthetically active radiation and growing season length |
| VerfasserIn |
J. Loisel, A. V. Gallego-Sala, Z. Yu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 9, no. 7 ; Nr. 9, no. 7 (2012-07-30), S.2737-2746 |
| Datensatznummer |
250007197
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| Publikation (Nr.) |
 copernicus.org/bg-9-2737-2012.pdf |
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| Zusammenfassung |
| High-latitude peatlands contain about one third of the world's soil organic
carbon, most of which is derived from partly decomposed Sphagnum
(peat moss) plants. We conducted a meta-analysis based on a global data set of
Sphagnum growth measurements collected from published literature to
investigate the effects of bioclimatic variables on Sphagnum growth.
Analysis of variance and general linear models were used to relate
Sphagnum magellanicum and S. fuscum growth rates to
photosynthetically active radiation integrated over the growing season (PAR0)
and a moisture index. We found that PAR0 was the main predictor of
Sphagnum growth for the global data set, and effective moisture was
only correlated with moss growth at continental sites. The strong correlation
between Sphagnum growth and PAR0 suggests the existence of a global
pattern of growth, with slow rates under cool climate and short growing
seasons, highlighting the important role of growing season length in
explaining peatland biomass production. Large-scale patterns of cloudiness
during the growing season might also limit moss growth. Although considerable
uncertainty remains over the carbon balance of peatlands under a changing
climate, our results suggest that increasing PAR0 as a result of global
warming and lengthening growing seasons, without major change in cloudiness,
could promote Sphagnum growth. Assuming that production and
decomposition have the same sensitivity to temperature, this enhanced growth
could lead to greater peat-carbon sequestration, inducing a negative feedback
to climate change. |
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