Sex-dependent resilience to extreme drought events:implications for climate change adaptation of a South American endangered tree species  

作　　者：Sergio Piraino Martín Ariel Hadad Yanina Antonia Ribas‑Fernández Fidel Alejandro Roig 

机构地区：[1]Laboratorio de Dendrocronología e Historia Ambiental(IANIGLA CONICET),Av.Dr.Adrian Ruiz Leal,Mendoza,Argentina [2]Facultad de Ciencias Agrarias,Universidad Nacional de Cuyo,Almte.Brown 52,Luján de Cuyo,Mendoza,Argentina [3]Laboratorio de Dendrocronología de ZonasÁridas(CIGEOBIO CONICET),Gabinete de Geología Ambiental(INGEO UNSJ),Av.JoséIgnacio de la Roza Oeste 727,San Juan,Argentina [4]Hémera Centro de Observación de la Tierra,Facultad de Ciencias,Universidad Mayor,Camino La Pirámide 5750,Huechuraba,Santiago,Chile

出　　处：《Ecological Processes》2024年第2期48-60,共13页生态过程(英文)

基　　金：supported by the Agencia Nacional de Promoción Científica y Tecnológica of Argentina(PICT-2018-1056 to MAH);Cooperation International Project between CONICET and NSFC-2019 to MAH;Cooperation International Project between CONICET and Royal Society-2019 to FAR

摘　　要：Background Recent changes in climatic trends are resulting in an increased frequency and intensity of extreme events,with unknown effect on ecosystem dynamics in the near future.Extreme drought episodes are recognized as disturbance factors capable of modifying forest dynamics and tree growth.Within this context,dioecious tree species may be impacted by climatic extremes,affecting male/female proportions and,consequently,reproductive processes and species persistence.Therefore,there is an urgent need for species-specific assessments of growth tolerance to extreme dry spells in dioecious tree species,to establish effective conservation strategies for these particular natural resources.Araucaria araucana(araucaria),an endangered dioecious Patagonian tree species,has recently undergone decay and mortality episodes in response to increasing dry climatic conditions.While sex-dependent tolerance to extreme drought episodes has been assessed in the species'humid distribution range,there is still a lack of information on the gender-based resilience of trees growing in the drier environments of the species'distribution.Methods We reconstructed,through dendrochronological methods,the sex-dependent response of 105 araucaria individuals(55 female and 50 male trees)to five regional extreme dry spells employing a set of different indices.Resistance,recovery period,and average growth reduction of standardized tree-ring growth were examined,analysing the effect of biotic(sex,pre-drought stem tree growth)and abiotic(local climatic conditions before,during,and after extreme climatic episodes)factors on tree resilience.Results Sex influences only the species resistance to climatic disturbance,with male individuals showing lower tolerance to extreme drought events.Pre-drought radial growth rates and local meteorological conditions preceding,during,and following extreme dry spells strongly modulated araucaria radial growth resilience regardless of tree sex,influencing the species resistance,recovery period,and average growth reductio

关 键 词：ARAUCARIA CLIMATE change Dendrochronology Extreme drought event RESILIENCE 

分 类 号：P467[天文地球—大气科学及气象学] P426.616