Phenological variation decreased carbon uptake in European forests during 1999–2013

Qifei Han* (Corresponding Author), Tiejun Wang, Yanbin Jiang (Corresponding Author), Richard Fischer, Chaofan Li

*Corresponding author for this work

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A number of studies have suggested that the duration of a growing season has significantly lengthened during the past decades, but the connections between phenology variability and the terrestrial carbon cycle are far from clear. In this study, we used a process-based ecosystem simulation model, BIOME-BGC, to investigate spatio-temporal variation in phenology and its impacts on carbon fluxes in European forests during 1999–2013. We found that the start of vegetation growing season advanced on average by 0.22 ± 0.55 d yr−1 and the length of growing season extended on average by 0.42 ± 0.86 d yr−1 for the period 1999–2013. Model simulations indicated that European forests acted as a weak carbon (C) sink with a mean value of 0.27 Tg C yr−1 (1 Tg = 1012 g) during 1999–2013. Phenological variation lowered the net ecosystem exchange (NEE) by 3.99 Tg C for the same period, and this could be explained by the opposing effect of enhanced heterotrophic respiration directly induced by the extension of growing season. NEE effects were negatively correlated with heterotrophic respiration (R2 = 0.43), and one Tg increase in the heterotrophic respiration decreased NEE by 2.28 Tg C. The implications for the practical management is that a climate change will result in a significant change of selection pressure, and that phenology is a major aspect of tree functioning that will need adjusting for a future climate.

Original languageEnglish
Pages (from-to)45-51
Number of pages7
JournalForest ecology and management
Early online date1 Jun 2018
Publication statusPublished - 1 Nov 2018


  • Climate change
  • NDVI
  • Net ecosystem exchange
  • Phenology
  • Remote sensing
  • 22/4 OA procedure

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