Evidence of advancing spring xylem phenology in Chinese forests under global warming  

作　　者：Huihong XUE Feng SHI Fabio GENNARETTI Yongshuo H.FU Bin HE Xiuchen WU Zhengtang GUO 

机构地区：[1]Key Laboratory of Cenozoic Geology and Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,100029,China [2]College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing,100049,China [3]CAS Center for Excellence in Life and Paleoenvironment,Beijing,100044,China [4]Institut de Recherche sur les Forêts,Groupe de Recherche enÉcologie de la MRC-Abitibi,Universitédu Québec en Abitibi-Témiscamingue,Amos,J9T 2L8,Canada [5]College of Water Sciences,Beijing Normal University,Beijing,100875,China [6]Faculty of Geographical Science,Beijing Normal University,Beijing,100875,China

出　　处：《Science China Earth Sciences》2023年第10期2187-2199,共13页中国科学（地球科学英文版）

基　　金：funded by the National Natural Science Foundation of China(Grant Nos.41888101&42077406);the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDB26020000);the Key Research Program of the Institute of Geology&Geophysics,CAS(Grant No.IGGCAS-201905);funded by the Youth Innovation Promotion Association CAS;supported by the Discovery Grants program of the Natural Sciences and Engineering Research Council of Canada(Grant No.RGPIN-2021-03553);by the Canadian Research Chair in dendroecology and dendroclimatology(Grant No.CRC2021-00368)。

摘　　要：Phenological responses of vegetation to the ongoing warming trend impact current and future primary productivity.However,few studies focus on wood phenology because its observed data are much scarcer,which hinders the estimation and prediction of forest carbon budgets over large regions.Here,we use a physiological process-based tree-ring growth model(Vaganov-Shashkin model)to investigate the spatial and temporal variations of spring xylem phenology(start of the growing season of xylem,SOS_(x))in tree-ring sites of China during 1962-2016 CE.The model is calibrated on measured tree-ring width chronologies(70 tree-ring chronologies)and successfully validated with field observations of xylogenesis.We found that spring xylem phenology significantly advances during 1962-2016 CE period under global warming,with the rate of advance quickly increasing after the 1990s to an average of 0.25 days per year.The preseason daily mean temperature is the main climatic driver for spring xylem phenology as indicated by its significant correlations with SOS_(x)at most sites(71%).Warmer preseason allows heat requirements for tree growth to be reached more quickly,with increase of 1℃in temperature of preseason anticipates SOS_(x)by 6 to 7 days,which will benefit the radial growth of trees in the relatively cold-humid environments.In addition,the significant positive correlation between the simulated spring xylem phenology and remote sensing derived phenology highlights the primary and secondary growth may be governed by the same variable(temperature)and change in the same direction with global warming.This study provides the long-term perspective on the spring xylem phenology variations covering most of China.

关 键 词：TREE-RING XYLEM PHENOLOGY Vaganov-Shashkin model China 

分 类 号：S718.5[农业科学—林学] P467[天文地球—大气科学及气象学]