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Refining the role of phenology in regulating gross ecosystem productivity across European peatlands

Koebsch, Franziska ; Sonnentag, Oliver ; Järveoja, Järvi ; Peltoniemi, Mikko ; Alekseychik, Pavel ; Aurela, Mika ; Arslan, Ali Nadir ; Dinsmore, Kerry ; Gianelle, Damiano and Helfter, Carole , et al. (2020) In Global Change Biology 26(2). p.876-887
Abstract

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... (More)

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.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
canopy greenness, commonality analysis, mediation, moderation, peatland C cycle, photosynthesis, structural equation modeling
in
Global Change Biology
volume
26
issue
2
pages
12 pages
publisher
Wiley-Blackwell
external identifiers
  • scopus:85076108017
  • pmid:31686431
ISSN
1354-1013
DOI
10.1111/gcb.14905
language
English
LU publication?
yes
id
932fa5c1-bd24-40de-b7a0-7d429fb5dd42
date added to LUP
2020-01-02 11:39:46
date last changed
2020-12-01 03:34:31
@article{932fa5c1-bd24-40de-b7a0-7d429fb5dd42,
  abstract     = {<p>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.</p>},
  author       = {Koebsch, Franziska and Sonnentag, Oliver and Järveoja, Järvi and Peltoniemi, Mikko and Alekseychik, Pavel and Aurela, Mika and Arslan, Ali Nadir and Dinsmore, Kerry and Gianelle, Damiano and Helfter, Carole and Jackowicz-Korczynski, Marcin and Korrensalo, Aino and Leith, Fraser and Linkosalmi, Maiju and Lohila, Annalea and Lund, Magnus and Maddison, Martin and Mammarella, Ivan and Mander, Ülo and Minkkinen, Kari and Pickard, Amy and Pullens, Johannes W.M. and Tuittila, Eeva Stiina and Nilsson, Mats B. and Peichl, Matthias},
  issn         = {1354-1013},
  language     = {eng},
  number       = {2},
  pages        = {876--887},
  publisher    = {Wiley-Blackwell},
  series       = {Global Change Biology},
  title        = {Refining the role of phenology in regulating gross ecosystem productivity across European peatlands},
  url          = {http://dx.doi.org/10.1111/gcb.14905},
  doi          = {10.1111/gcb.14905},
  volume       = {26},
  year         = {2020},
}