Refining the role of phenology in regulating gross ecosystem productivity across European peatlands.
canopy greenness
commonality analysis
mediation
moderation
peatland C cycle
photosynthesis
structural equation modeling
Journal
Global change biology
ISSN: 1365-2486
Titre abrégé: Glob Chang Biol
Pays: England
ID NLM: 9888746
Informations de publication
Date de publication:
02 2020
02 2020
Historique:
received:
04
07
2019
revised:
20
09
2019
accepted:
09
10
2019
pubmed:
7
11
2019
medline:
17
3
2020
entrez:
6
11
2019
Statut:
ppublish
Résumé
The role of plant phenology as a regulator for gross ecosystem productivity (GEP) in peatlands is empirically not well constrained. This is because proxies to track vegetation development with daily coverage at the ecosystem scale have only recently become available and the lack of such data has hampered the disentangling of biotic and abiotic effects. This study aimed at unraveling the mechanisms that regulate the seasonal variation in GEP across a network of eight European peatlands. Therefore, we described phenology with canopy greenness derived from digital repeat photography and disentangled the effects of radiation, temperature and phenology on GEP with commonality analysis and structural equation modeling. The resulting relational network could not only delineate direct effects but also accounted for possible effect combinations such as interdependencies (mediation) and interactions (moderation). We found that peatland GEP was controlled by the same mechanisms across all sites: phenology constituted a key predictor for the seasonal variation in GEP and further acted as a distinct mediator for temperature and radiation effects on GEP. In particular, the effect of air temperature on GEP was fully mediated through phenology, implying that direct temperature effects representing the thermoregulation of photosynthesis were negligible. The tight coupling between temperature, phenology and GEP applied especially to high latitude and high altitude peatlands and during phenological transition phases. Our study highlights the importance of phenological effects when evaluating the future response of peatland GEP to climate change. Climate change will affect peatland GEP especially through changing temperature patterns during plant phenologically sensitive phases in high latitude and high altitude regions.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
876-887Subventions
Organisme : Kempe Foundation
ID : SMK-1544
Pays : International
Organisme : European Social Fund
ID : ESF/14-BM-A55-0030/16
Pays : International
Informations de copyright
© 2019 John Wiley & Sons Ltd.
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