AUTHOR=Walde Manuel G. , Wu Zhaofei , Fox Tom , Baumgarten Frederik , Fu Yongshuo H. , Wang Shuxin , Vitasse Yann 

TITLE=Higher spring phenological sensitivity to forcing temperatures of Asian compared to European tree species under low and high pre-chilling conditions

JOURNAL=Frontiers in Forests and Global Change

VOLUME=Volume 5 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/forests-and-global-change/articles/10.3389/ffgc.2022.1063127

DOI=10.3389/ffgc.2022.1063127

ISSN=2624-893X

ABSTRACT=Spring phenology of temperate trees is driven by winter chilling, spring forcing temperature and photoperiod.However, there is a lack in studies that tried to disentangle the interaction of those factors given that requirements of each factor varies greatly dependent on species. Therefore, we investigated the interaction of different pre-chilling conditions, photoperiods and a broad range of forcing temperatures. In addition, we investigated whether phylogentic related species show a distinct reaction to those cues dependent on predictivity of winter-spring transition of the local climate. We found that temperature is the most important driver of spring phenology for most species investigated, whereas photoperiod mostly if at all plays a subordinate role regardless of origin. Further, the tree species growing in a more predictable climate reacted faster to forcing temperature. Thus, our results suggest that deciduous trees may have adapted their chilling and forcing requirements to the predictability of winter-spring transition and late spring frosts.