Photoperiod decelerates the advance of spring phenology of six deciduous tree species under climate warming

Lin Meng, Yuyu Zhou, Lianhong Gu, Andrew D. Richardson, Josep Peñuelas, Yongshuo Fu, Yeqiao Wang, Ghasserm R. Asrar, Hans J. De Boeck, Jiafu Mao, Yongguang Zhang, Zhuosen Wang

Research output: Contribution to journalArticlepeer-review

50 Scopus citations


Vegetation phenology in spring has substantially advanced under climate warming, consequently shifting the seasonality of ecosystem process and altering biosphere–atmosphere feedbacks. However, whether and to what extent photoperiod (i.e., daylength) affects the phenological advancement is unclear, leading to large uncertainties in projecting future phenological changes. Here we examined the photoperiod effect on spring phenology at a regional scale using in situ observation of six deciduous tree species from the Pan European Phenological Network during 1980–2016. We disentangled the photoperiod effect from the temperature effect (i.e., forcing and chilling) by utilizing the unique topography of the northern Alps of Europe (i.e., varying daylength but uniform temperature distribution across latitudes) and examining phenological changes across latitudes. We found prominent photoperiod-induced shifts in spring leaf-out across latitudes (up to 1.7 days per latitudinal degree). Photoperiod regulates spring phenology by delaying early leaf-out and advancing late leaf-out caused by temperature variations. Based on these findings, we proposed two phenological models that consider the photoperiod effect through different mechanisms and compared them with a chilling model. We found that photoperiod regulation would slow down the advance in spring leaf-out under projected climate warming and thus mitigate the increasing frost risk in spring that deciduous forests will face in the future. Our findings identify photoperiod as a critical but understudied factor influencing spring phenology, suggesting that the responses of terrestrial ecosystem processes to climate warming are likely to be overestimated without adequately considering the photoperiod effect.

Original languageEnglish (US)
Pages (from-to)2914-2927
Number of pages14
JournalGlobal change biology
Issue number12
StatePublished - Jun 2021


  • chilling
  • climate change
  • daylength
  • phenological model
  • spring leaf-out
  • temperature

ASJC Scopus subject areas

  • Global and Planetary Change
  • Environmental Chemistry
  • Ecology
  • General Environmental Science


Dive into the research topics of 'Photoperiod decelerates the advance of spring phenology of six deciduous tree species under climate warming'. Together they form a unique fingerprint.

Cite this