Linking belowground and aboveground phenology in two boreal forests in Northeast China

摘要: The functional equilibrium between roots and shoots suggests an intrinsic linkage belowground aboveground phenology. However, much less understanding of phenology hinders integrating We measured root respiration (R a) as a surrogate for integrated it with observed leaf radial growth in birch (Betula platyphylla)–aspen (Populus davidiana) forest adjacent larch (Larix gmelinii) Northeast China. A log-normal model successfully described the seasonal variations R indicated initiation, termination peak date Both were highly specific, later onset, earlier termination, shorter period growing season pioneer tree species (birch aspen) than dominant (larch). Root showed dates An asynchronous correlation was identified time lag approximately 1 month, indicating aprioritization shoot growth. Furthermore, we found that strongly correlated soil temperature air temperature, while only significantly implying down-regulating effect temperature. Our results indicate different phenologies support down-regulation hypothesis plant which can be helpful dynamics context climate change.