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

• DOI: 10.1111/gcb.14905
• Publication Date: 2019-11-05T09:20:26Z
• Authors: Franziska Koebsch; Oliver Sonnentag; Järvi Järveoja; Mikko Peltoniemi; Pavel Alekseychik; Mika Aurela; Ali Nadir Arslan; Kerry Dinsmore; Damiano Gianelle; Carole Helfter; Marcin Jackowicz‐...; Aino Korrensalo; Fraser Leith; Maiju Linkosalmi; Annalea Lohila; Magnus Lund; Martin Maddison; Ivan Mammarella; Ülo Mander; Kari Minkkinen; Amy Pickard; Johannes W. M. Pu...; Eeva‐Stiina Tuittila; Mats B. Nilsson; Matthias Peichl
• Keywords: 570; 550; Climate Change; NORTHERN PEATLAND; Canopy greenness; structural equation modeling; 01 natural sciences; Structural equation modeling; CO2 EXCHANGE; Moderation; Peatland C cycle; Settore BIO/07 - ECOLOGIA; canopy greenness; mediation; Photosynthesis; Commonality analysis; TEMPERATURE; Ecosystem; 0105 earth and related environmental sciences; commonality analysis; moderation; photosynthesis; structural equation modelin; CARBON-DIOXIDE EXCHANGE; PHOTOSYNTHESIS; AREA; Mediation; Temperature; Forestry; 15. Life on land; VARIABILITY; RESPIRATION; Ecology, evolutionary biology; peatland C cycle; 13. Climate action; DIGITAL REPEAT PHOTOGRAPHY; GROWING-SEASON; ta1181; Seasons

The role of plant phenology as a regulator for gross ecosystem productivity (GEP) in peatlands is empirically not well constrained. This because proxies to track vegetation development with daily coverage at the scale have only recently become available and lack such data has hampered disentangling biotic abiotic effects. study aimed unraveling mechanisms that regulate seasonal variation GEP across network eight European peatlands. Therefore, we described canopy greenness derived from digital repeat photography disentangled effects radiation, temperature on commonality analysis structural equation modeling. resulting relational could delineate direct but also accounted possible effect combinations interdependencies (mediation) interactions (moderation). We found peatland was controlled by same all sites: constituted key predictor further acted distinct mediator radiation GEP. In particular, air fully mediated through phenology, implying representing thermoregulation photosynthesis were negligible. tight coupling between temperature, applied especially high latitude altitude during phenological transition phases. Our highlights importance when evaluating future response climate change. Climate change will affect changing patterns phenologically sensitive phases regions.