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

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Ecological Processes 2024年第02期13卷 48-60页

作者： Sergio Piraino martín.ariel hadad Yanina Antonia Ribas-Fernández Fidel Alejandro Roig Laboratorio de Dendrocronología e Historia Ambiental (IAnIGLA COnICET ) Facultad de Ciencias Agrarias Universidad Nacional de Cuyo Laboratorio de Dendrocronología de Zonas áridas (CIGEOBIO COnICET ) Gabinete de Geología Ambiental (INGEO UNSJ) Hémera Centro de Observación de la Tierra Facultad de Ciencias Universidad Mayor

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' *** 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 *** 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 s

关键词： Araucaria Climate change Dendrochronology Extreme drought event Resilience

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树轮记录的自公元1200年以来强火山喷发事件与高亚洲南部河流源区气候水文变化的关联

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第四纪研究 2021年第2期41卷 323-333页

作者：陈友平陈峰张合理胡茂王世杰 hadad martín.ariel Roig Junent Fidel ALEJAnDRO 云南大学国际河流与生态安全研究院国际河流与跨境生态安全重点实验室云南昆明650504 中国气象局乌鲁木齐沙漠气象研究所树木年轮理化研究重点开放实验室/新疆树木年轮生态实验室新疆乌鲁木齐830002 Laboratorio de Dendrocronología e Historia Ambiental IANIGLACCT CONICETMendozaP.O.Box330MendozaArgentina

强火山喷发作为气候变化重要的外强迫因素,其所造成的气候环境效应一直是气候变化研究热点,而其对于流域水循环影响较少受关注。本文利用采自高亚洲南部河流源区麦吊云杉(Picea brachytyla)树轮样本,研制出一个长达885 a的树木年轮标准... 详细信息

强火山喷发作为气候变化重要的外强迫因素,其所造成的气候环境效应一直是气候变化研究热点,而其对于流域水循环影响较少受关注。本文利用采自高亚洲南部河流源区麦吊云杉(Picea brachytyla)树轮样本,研制出一个长达885 a的树木年轮标准宽度年表。基于树轮气候响应分析结果,利用线性回归模型重建研究区自公元1200年上年11月至当年2月平均最低气温变化,重建方程方差解释量47.1%。该气温重建序列显示,研究区自公元1200年经历了8个冷期和9个暖期,包含有10个极冷年和23个极暖年。同时,该气温重建序列验证了自公元1200年来27次强火山喷发(VEI≥5)对于青藏高原东南部河流源区气候的影响,包括1257年Samalas和1815年Tambora等强火山喷发事件。该气温重建序列与相关河流径流数据对比结果表明强火山喷发在引起高亚洲南部河流源区气温出现明显下降的同时,也可能会进一步导致水循环减缓,使得高亚洲南部河流径流量出现减少。

关键词：树木年轮气温重建火山喷发水文效应青藏高原

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基于白扦树轮蓝光强度的中国华北暖季温度重建

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Journal of Geographical Sciences 2023年第12期33卷 2511-2529页

作者：陈巧湄岳伟鹏陈峰马丁·哈达德菲德尔·罗伊格赵晓恩胡茂曹红华 Yunnan Key Laboratory of International Rivers and Transboundary Eco-Security Institute of International Rivers and Eco-SecurityYunnan UniversityKunming650500China Key Laboratory of Tree-ring Physical and Chemical Research of the Chinese Meteorological Administration/Xinjiang Laboratory of Tree-ring Ecology Institute of Desert MeteorologyChinese Meteorological AdministrationUrumqi830002China Laboratorio de Dendrocronología de ZonasÁridas CIGEOBIO(COnICET-UnSJ) Gabinete de Geología Ambiental(INGEO-UNSJ)San JuanArgentina Laboratorio de Dendrocronología e Historia Ambiental IANIGLA-CCT CONICET-Universidad Nacional de CuyoMendozaArgentina Hémera Centro de Observación de la Tierra Escuela de Ingeniería ForestalFacultad de CienciasUniversidad MayorHuechurabaSantiagoChile

In the past 30 years,observational climate datasets reveal a significant a drying and warming trend over in north *** of climatic variability over north China and its driving mechanism in a long-term perspective is,however,limited to a few sites only,especially the lack of temperature reconstructions based on latewood density and blue *** this study,we developed a 281-year latewood blue intensity chronology based on 45 cores of Picea meyeri in western north *** on the discovery that the warm season(May–August)mean maximum temperature is the main controlling factor affecting the change in blue light reflection intensity,we established a regression model that explained 37%of the variance during the calibration period(1950–2020),allowing to trace the mean maximum temperature up to 1760 *** the past 261 years,we identified seven persistent high temperature periods(1760–1773,1778–1796,1805–1814,1869–1880,1889–1934,1984–2000,2004–2020)and three persistent low temperature periods(1815–1868,1935–1963,1969–1983)in north *** of a nearby temperature reconstructions and climate gridded data indicate that our reconstruction record a wide range of temperature variations in north *** analysis of links between large-scale climatic variation and the temperature reconstruction showed that there is a relationship between extremes in the warm season temperature and anomalous SSTs in the equatorial eastern Pacific,and implied that the extremes in the warm season temperature in north China will be intensified under future global warming.

关键词： blue intensity Picea meyeri mean maximum temperature north China dendroclimatology

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