Parameters of leaf phenology for North American forests

<p>Leaf phenology regulates multiple aspects of plant vital activities and provides feedback to climate change. Despite its importance, an effective parameterization method to predict continental-scale leaf phenology has been elusive. Here, we developed a new parameterization method using local climatic conditions instead of species or plant function types to calibrate the phenology parameters of forests. We provided the parameters of phenology include: the effective temperature threshold (TA) to determine spring phenology (i.e. start of the season; SOS); the critical heat threshold (SA) to determine SOS; the effective temperature threshold (TB) to determine autumn phenology (i.e. end of the season; EOS); the effective photoperiod threshold (Pstart) to determine EOS, and the critical chilling threshold (SB) to determine EOS.</p>