Refining the role of phenology in regulating gross ecosystem productivity across European peatlands
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Date
2019-11-05
Authors
Koebsch, Franziska
Sonnentag, Oliver
Järveoja, Järvi
Peltoniemi, Mikko
Alekseychik, Pavel
Aurela, Mika
Arslan, Ali Nadir
Dinsmore, Kerry
Gianelle, Damiano
Helfter, Carole
Journal Title
Journal ISSN
Volume Title
Publisher
John Wiley & Sons, Inc.
Published Version
Abstract
The role of plant phenology as 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 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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Keywords
Canopy greenness , Commonality analysis , Mediation , Moderation , Peatland C cycle , Photosynthesis , Structural equation modeling
Citation
Koebsch, F., Sonnentag, O., Järveoja, J., Peltoniemi, M., Alekseychik, P., Aurela, M., Arslan, A. N., Dinsmore, K., Gianelle, D., Helfter, C., Jackowicz-Korczynski, M., Korrensalo, A., Leith, F., Linkosalmi, M., Lohila A., Lund, M., Maddison, M., Mammarella, I., Mander, Ü., Minkkinen, K., Pickard, A., Pullens, J. W. M., Tuittila, E.-S., Nilsson, M. B. and Peichl, M. (2019) 'Refining the role of phenology in regulating gross ecosystem productivity across European peatlands', Global Change Biology. doi: 10.1111/gcb.14905
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Copyright
© 2019, John Wiley & Sons Inc. This is the peer reviewed version of the following article, Koebsch, F., Sonnentag, O., Järveoja, J., Peltoniemi, M., Alekseychik, P., Aurela, M., Arslan, A. N., Dinsmore, K., Gianelle, D., Helfter, C., Jackowicz-Korczynski, M., Korrensalo, A., Leith, F., Linkosalmi, M., Lohila A., Lund, M., Maddison, M., Mammarella, I., Mander, Ü., Minkkinen, K., Pickard, A., Pullens, J. W. M., Tuittila, E.-S., Nilsson, M. B. and Peichl, M. (2019) 'Refining the role of phenology in regulating gross ecosystem productivity across European peatlands', Global Change Biology, doi: 10.1111/gcb.14905, which has been published in final form at https://doi.org/10.1111/gcb.14905. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.