Differences and similarities in radial growth of Betula species to climate change  

作　　者：Di Liu Yang An Zhao Li Zhihui Wang Yinghui Zhao Xiaochun Wang 

机构地区：[1]Center for Ecological Research,Key Laboratory of Sustainable Forest Ecosystem Management,Ministry of Education,College of Forestry,Northeast Forestry University,Harbin 150040,People’s Republic of China [2]Changan Park in Shijiazhuang,Shijiazhuang 050000,People’s Republic of China [3]Shijiazhuang Landscape Greening Engineering Project Construction Center,Shijiazhuang 050000,People’s Republic of China [4]Heilongjiang Institute of Meteorological Science,Harbin 150030,People’s Republic of China [5]School of Life,Qufu Normal University,Qufu 273100,People’s Republic of China

出　　处：《Journal of Forestry Research》2024年第2期176-187,共12页林业研究（英文版）

基　　金：the Key Project of the China National Key Research and Development Program(2021YFD2200401);the National Natural Science Foundation of China(42177421 and 41877426)。

摘　　要：Betula platyphylla and Betula costata are important species in mixed broadleaved-Korean pine(Pinus koraiensis)forests.However,the specific ways in which their growth is affected by warm temperatures and drought remain unclear.To address this issue,60 and 62 tree-ring cores of B.platyphylla and B.costata were collected in Yichun,China.Using dendrochronological methods,the response and adaptation of these species to climate change were examined.A“hysteresis effect”was found in the rings of both species,linked to May–September moisture conditions of the previous year.Radial growth of B.costata was positively correlated with the standardized precipitation-evapotranspiration index(SPEI),the precipitation from September to October of the previous year,and the relative humidity in October of the previous year.Growth of B.costata is primarily restricted by moisture conditions from September to October.In contrast,B.platyphylla growth is mainly limited by minimum temperatures in May–June of both the previous and current years.After droughts,B.platyphylla had a faster recovery rate compared to B.costata.In the context of rising temperatures since 1980,the correlation between B.platyphylla growth and monthly SPEI became positive and strengthened over time,while the growth of B.costata showed no conspicuous change.Our findings suggest that the growth of B.platyphylla is already affected by warming temperatures,whereas B.costata may become limited if warming continues or intensifies.Climate change could disrupt the succession of these species,possibly accelerating the succession of pioneer species.The results of this research are of great significance for understanding how the growth changes of birch species under warming and drying conditions,and contribute to understanding the structural adaptation of mixed broadleaved-Korean pine(Pinus koraiensis)forests under climate change.

关 键 词：Tree rings Betula platyphylla Betula costata Climate response Moving correlation Extreme drought 

分 类 号：S792.15[农业科学—林木遗传育种]