Growth plasticity of conifers did not avoid declining resilience to soil and atmospheric droughts during the 20th century  

作　　者：Tong Zheng Jordi Martínez-Vilalta Raúl García-Valdés Antonio Gazol J.Julio Camarero Changcheng Mu Maurizio Mencuccini 

机构地区：[1]Northeast Forestry University,Harbin,150040,China [2]CREAF,E08193 Bellaterra(Cerdanyola del Vallès),Catalonia,Spain [3]Universitat Autònoma de Barcelona,E08193 Bellaterra(Cerdanyola del Vallès),Catalonia,Spain [4]Centre de Ciència i Tecnologia Forestal de Catalunya(CTFC),E-25280,Solsona,Spain [5]Department of Biology,Geology,Physics and Inorganic Chemistry,Rey Juan Carlos University,28933,Móstoles,Madrid,Spain [6]Instituto Pirenaico de Ecologia(IPE-CSIC),Zaragoza,50059,Spain [7]ICREA,08010,Barcelona,Spain

出　　处：《Forest Ecosystems》2023年第2期238-251,共14页森林生态系统（英文版）

基　　金：TZ acknowledges contribution from the China Scholarship Council(CSC);MM and JM-V received support from the Spanish Ministry of Science and Innovation(MICINN)via competitive grant CGL2017-89149-C2-1-R;AG and JJC were supported by the FUNDIVER project of the Spanish Ministry of Science and Innovation(CGL2015-69186-C2-1-R).

摘　　要：Background:Plasticity in response to environmental drivers can help trees cope with droughts.However,our understanding of the importance of plasticity and physiological adjustments in trees under global change is limited.Methods:We used the International Tree-Ring Data Bank(ITRDB)to examine 20th century growth responses in conifer trees during(resistance)and following(resilience)years of severe soil and atmospheric droughts occurring in isolation or as compound events.Growth resilience indices were calculated using observed growth divided by expected growth to avoid spurious correlations,in which the expected values were obtained by the autoregressive moving average(ARIMA)model.We used high atmospheric vapour pressure deficit(VPD)to select years of atmospheric drought and low annual values of the Standardized Precipitation-Evapotranspiration Index(SPEI)to select years with soil drought.We acquired the sensitivities(i.e.,the slopes of the relationships)by fitting the resilience indices as a function of environmental drivers,and assessed how these sensitivities changed over time for different types of drought events using linear mixed models.We also checked whether plasticity in growth responses was sufficient to prevent long-term trends of growth reductions during or after severe droughts.We acknowledge that by focusing on the response of surviving trees from the ITRDB we are potentially biasing our results towards higher resilience,as stand level responses(e.g.,mortality)may result in lowered competition after the disturbance event.Results:Sensitivities of resilience to VPD and SPEI changed throughout the 20th century,with the directions of these changes often reversing in the second half of the century.For the 1961–2010 period,changing sensitivities had positive effects on resilience,especially following years of high-VPD and compound events,avoiding growth losses that would have occurred if sensitivities had remained constant.Despite sensitivity changes,resilience was still lower at the end of the 20th centur

关 键 词：Tree rings GROWTH Drought Vapor pressure deficit PLASTICITY ACCLIMATION 

分 类 号：S718.5[农业科学—林学]