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Physiological phenotypes differ among color morphs in introduced common wall lizards(Podarcis muralis)

Integrative Zoology 2024年第3期19卷 505-523页

作者： Ali AMER Sierra SPEARS Princeton L.VAUgHN Cece COLWELL Ethan H.LIVINgSTON Wyatt MCQUEEN Anna SCHILL Dustin g.REICHARD eric j.gANgLOFF Kinsey M.BROCK Department of Biological Sciences Ohio Wesleyan UniversityDelawareOhioUSA Department of Ecology and Evolutionary Biology Princeton UniversityPrincetonNew JerseyUSA Department of Biology Idaho State UniversityPocatelloIdahoUSA Department of Environmental Science Policyand ManagementCollege of Natural ResourcesUniversity of CaliforniaBerkeleyUSA Museum of Vertebrate Zoology University of CaliforniaBerkeleyUSA

Many species exhibit color polymorphisms which have distinct physiological and behavioral ***,the consistency of morph trait covariation patterns across species,time,and ecological contexts remains *** trait covariation is especially relevant in the context of invasion biology and urban ***,physiological traits pertaining to energy maintenance are crucial to fitness,given their immediate ties to individual reproduction,growth,and population *** investigated the physiological traits of Podarcis muralis,a versatile color polymorphic species that thrives in urban environments(including invasive populations in Ohio,USA).We measured five physiological traits(plasma corticosterone and triglycerides,hematocrit,body condition,and field body temperature),which compose an integrated multivariate *** then tested variation among co-occurring color morphs in the context of establishment in an urban *** found that the traits describing physiological status and strategy shifted across the active season in a morph-dependent manner—the white and yellow morphs exhibited clearly different multivariate physiological phenotypes,characterized primarily by differences in plasma *** suggests that morphs have different strategies in physiological regulation,the flexibility of which is crucial to urban *** white-yellow morph exhibited an intermediate phenotype,suggesting an intermediary energy maintenance *** morphs also exhibited distinct phenotypes,but the low prevalence of this morph in our study populations precludes clear *** work provides insight into how differences among stable polymorphisms exist across axes of the phenotype and how this variation may aid in establishment within novel environments.

关键词： color polymorphism physiological status seasonal variation thermoregulation urban habitat

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家族性高胆固醇血症大家系在两个世纪中的死亡率:家系死亡率研究

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英国医学杂志中文版 2002年第3期5卷 129-132页

作者： eric j g sijbrands Rudi g j Westendorp joep C Defesche Paul H E M deMeier Augustinus H M Smelt john j P Kastelein 马志毅 Department of Vascular Medicine and general Internal Medicine Clinical Epidemiology Leiden University MedicalCentre Department of general Internal University MedicalCentre

目的 :评估未经治疗的无冠状动脉疾病的家族性高胆固醇血症所有原因的死亡率。设计 :家系死亡率研究。背景 :荷兰的一个大家系 ,其宗亲源自 19世纪一对夫妇。先证者 :家族中所有超过 2 0岁且有 5 0 %可能性携带家族性高胆固醇血症突变... 详细信息

目的 :评估未经治疗的无冠状动脉疾病的家族性高胆固醇血症所有原因的死亡率。设计 :家系死亡率研究。背景 :荷兰的一个大家系 ,其宗亲源自 19世纪一对夫妇。先证者 :家族中所有超过 2 0岁且有 5 0 %可能性携带家族性高胆固醇血症突变基因者。主要结果测定指标 :各种原因的死亡率。结果 :分析自 6 95 0人年的 2 5 0人中共死亡的70人。突变基因携带者的死亡率在 19世纪和 2 0世纪早期并未升高 ,1915年后开始升高 ,1935～196 4年达到高峰 (标准化死亡率比 1 78,95 %可信区间 1 13～ 2 76 ,P =0 0 0 3) ,以后下降。家系的两大分支间死亡率有显著性差异 (相对危险性3 2 6 ,95 %可信区间 1 74～ 6 11;P =0 0 0 1)。结论 :家族性高胆固醇血症患者间的死亡危险性差异显著。这种时间上及家系的不同分支间的巨大差异表明环境因素与基因有强大的相互作用。有必要进一步研究以识别那些极高危并需早期和强力预防措施的家族性高胆固醇血症患者。

关键词：家族性高胆固醇血症死亡率家系死亡率研究

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Confirmation of a Sub-Saturn-size Transiting Exoplanet Orbiting a g Dwarf:TOI-1194 b and a Very Low Mass Companion Star: TOI-1251 B from TESS

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Research in Astronomy and Astrophysics 2024年第3期24卷 129-143页

作者： jia-Qi Wang Xiao-jun jiang jie Zheng Hanna Kellermann Arno Riffeser Liang Wang Karen A.Collins Allyson Bieryla Lars A.Buchhave Steve B.Howell Elise Furlan eric girardin joao gregorio eric jensen Felipe Murgas Mesut Yilmaz Sam Quinn Xing gao Ruo-Yu Zhou Frank grupp Hui-juan Wang CAS Key Laboratory of Optical Astronomy National Astronomical ObservatoriesChinese Academy Of SciencesBeijing 10010China University of Chinese Academy of Sciences Beijing 100049China University Observatory Munich Scheinertrsse 1.D-81679 MunichGemany Max Planck Institute for Extraterrestrial Physics Giessenbachstr.1D-85748 GarchingGermany National Astronomical Observatories/Nanjing Institute of Astronomical Optics&Technology Chinese Academy of SciencesNanjing210042China CAS Key Laboratory of Astronomical Optics&Technology Nanjing Institute of Astronomical Optics&TechnologyNanjing 210042China Center for Astrophysics Harvard&Smithsonian60 Garden Street.CambridgeMA 02138USA National Space Institute Technical University of DenmarkElektrovejDK-2800 KgsLyngbyDenmark NASA Ames Research Center Moffett FieldCA 94035USA NASA Exoplanet Science Institute Caltech/IPACMail Code 100-221200 E.California Blvd.PasadenaCA91125USA grand Pra Observatory Switzerland Department of Physics Washington UniversitySt.LouisMO 63130.USA Department of Physics and Astronomy Swarthmore CollegeSwarthmorePA 19081USA Instituto de Astrofísica de Canarias(IAC) E-38205 La Laguna.TenerifeSpain Departamento de Astrofísica Universidad de La LagunaSpain Dept.of Astronomy and Space Sciences Ankara UniversityTandogan 06100AnkaraTurkey Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China Urumqi No.1 Senior High School Urumqi 830002China Lijiang gemini Observatory Lijiang 674199China

We report the confirmation of a sub-Saturn-size exoplanet,TOI-1194 b,with a mass of about 0.456+0.055-0.051M_(j),and a very low mass companion star with a mass of about 96.5±1.5 Mj,TOI-1251 *** candidates provided by the Transiting Exoplanet Survey Satellite(TESS)are suitable for further follow-up observations by ground-based telescopes with small and medium *** analysis is performed based on data from several telescopes worldwide,including telescopes in the Sino-german multiband photometric campaign,which aimed at confirming TESS Objects of Interest(TOIs)using ground-based small-aperture and medium-aperture telescopes,especially for long-period ***-1194 b is confirmed based on the consistent periodic transit depths from the multiband photometric *** measure an orbital period of 2.310644±0.000001 days,the radius is 0.767+0.045-0.041Rj and the amplitude of the RV curve is 69.4_(-7.3)^(+7.9)m s^(-1).TOI-1251 B is confirmed based on the multiband photometric and high-resolution spectroscopic data,whose orbital period is 5.963054+0.000002-0.000001days,radius is 0.947+0.035-0.033 R_(j) and amplitude of the RV curve is 9849_(-40)^(+42)ms^(-1).

关键词： planets and satellites fundamental parameters-planets and satellites gaseous planets-stars fundamental parameters-stars low-mass-methods data analysis-techniques photometric-techniques spectroscopic

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Radioisotope production using lasers:From basic science to applications

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Matter and Radiation at Extremes 2024年第3期9卷 31-44页

作者： M.R.D.Rodrigues A.Bonasera M.Scisciò j.A.Pérez-Hernández M.Ehret F.Filippi P.L.Andreoli M.Huault H.Larreur D.Singappuli D.Molloy D.Raffestin M.Alonzo g.g.Rapisarda D.Lattuada g.L.guardo C.Verona Fe.Consoli g.Petringa A.McNamee M.La Cognata S.Palmerini T.Carriere M.Cipriani g.Di giorgio g.Cristofari R.De Angelis g.A.P.Cirrone D.Margarone L.giuffrida D.Batani P.Nicolai K.Batani R.Lera L.Volpe D.giulietti S.Agarwal M.Krupka S.Singh Fa.Consoli Cyclotron Institute Texas A&M UniversityCollege StationTexas 77840USA Laboratori Nazionali del Sud Istituto Nazionale di Fisica Nucleare(LNS-INFN)CataniaItaly ENEA Fusion and Technologies for Nuclear Safety and Security Department-CFrascatiItaly Centro de Láseres Pulsados(clpu) VillamayorSpain Universidad de Salamanca SalamancaSpain Centre Lasers Intenses et Applications(CELIA) Universitéde BordeauxCNRSCEATalenceFrance HB11 Energy Holdings Pty FreshwaterNew South WalesAustralia School of Mathematics and Physics Queen’s University BelfastBelfastUnited Kingdom Dipartimento di Fisica e Astronomia“E.Majorana ”Università di CataniaCataniaItaly Facoltàdi Ingegneria e Architettura Universitàdegli Studi di Enna“Kore”EnnaItaly Dipartimento di Ingegneria Industriale Universitàdi Roma“Tor Vergata”RomaItaly Dipartimento di Fisica e geologia Universitàdegli Studi di PerugiaPerugiaItaly Istituto Nazionale di Fisica Nucleare Sezione di PerugiaPerugiaItaly ELI Beamlines Facility the Extreme Light Infrastructure ERICDolni BrezanyCzech Republic ETSIA Universidad Politécnica de MadridMadridSpain Dipartimento Fisica “E.Fermi”Universitàdi Pisa and INFNPisaItaly FZU–Institute of Physics of Czech Academy of Sciences PragueCzech Republic Institute of Plasma Physics of Czech Academy of Sciences PragueCzech Republic

The discovery of chirped pulse amplification has led to great improvements in laser technology,enabling energetic laser beams to be compressed to pulse durations of tens of femtoseconds and focused to a few *** with energies of tens of MeV can be accelerated using,for instance,target normal sheath acceleration and focused on secondary *** such conditions,nuclear reactions can occur,with the production of radioisotopes suitable for medical *** use of high-repetition lasers to produce such isotopes is competitive with conventional methods mostly based on *** this paper,we study the production of^(67)Cu,^(63)Zn,^(18)F,and^(11)C,which are currently used in positron emission tomography and other *** the same time,we study the reactions^(10)B(p,α)^(7)Be and^(70)Zn(p,4n)^(67)ga to put further constraints on the proton distributions at different angles,as well as the reaction^(11)B(p,α)^(8)Be relevant for energy *** experiment was performed at the 1 PW laser facility at VegaⅢin Salamanca,*** distributions of radioisotopes in the forward(with respect to the laser direction)and backward directions were measured using a high purity germanium *** results are in reasonable agreement with numerical estimates obtained following the approach of Kimura and Bonasera[*** ***.,Sect.A 637,164–170(2011)].

关键词： purity estimates backward

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Traditional Healer’s Medicinal Practice Survey and Clinical Evidence Assessment of “YIKI”: An Antimalarial Phytomedicine Recipe from Bobo-Dioulasso, Burkina Faso

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Pharmacology & Pharmacy 2024年第7期15卷 248-267页

作者： Zachari Kabre Rakiswende Serge Yerbanga Aminata Fofana Roland Nâg-Tiero Meda Anyirekun Fabrice Some Alassane Haro Natacha A. j. A. Boro Fazhira B. Ye Benjamin Kouliga Koama Sami eric Kam Eliasse Zongo Hadidjatou Belèm Windmi Kagambèga Florence Fournet georges A. Ouedraogo jean-Bosco Ouedraogo Institut de Recherche en Sciences de la Sant Direction Rgionale de lOuest Bobo-Dioulasso Burkina Faso Laboratoire de Recherche et dEnseignement en Sant et Biotechnologies Animales Universit Nazi BONI Bobo-Dioulasso Burkina Faso Institut des Sciences et Techniques Bobo-Dioulasso Burkina Faso Laboratoire de Recherche en Bactriologie INSP/Centre MURAZ Bobo-Dioulasso Burkina Faso Maladies Infectueuses et Vecteurs: Ecologie Gntique Evolution et Contrle (MIVEGEC) Institut de Recherche pour le Dveloppement Universit de Monpellier Montpellier France

YIKI is an antimalarial phytomedicine used by a traditional healer to treat malaria in Bobo-Dioulasso. However, there is no scientific evidence to support its use by local populations. The aim of this study was to identify the medicinal practices of the healer holder of YIKI and assess the clinical evidence of its phytomedicine in the uncomplicated malaria treatment. Ethnomedical survey based on a semi-structured and open questionnaire was conducted from October to December 2019 with the healer. Malaria knowledge and diagnosis methods, patient treatment and monitoring, and recipe formulation steps were surveyed. Moreover, thick and thin blood smears were taken, haemoglobin levels and temperature of consenting patients were measured before treatment, mid-treatment and at the end of treatment. The survey revealed that the healer has a good knowledge of malaria symptoms and his diagnosis is based on observation and physical examination of patients. The healer’s malaria diagnosis was rudimentary and had accuracy problems, with only 62.79% of malaria cases confirmed by microscopy. The formulation of YIKI and its use to treat malaria follow a standard process for plant harvesting, powder quantities and posology, but do not use any reproducible parameters for dose adjustment. Forty-three patients diagnosed and treated by the healer participated in the study. Laboratory results revealed 27 Plasmodium falciparum infection cases, including 2 with parasitaemia ≥ 200,000 p/µl blood. 25 patients were selected for therapeutic evidence assessment. There was a 48% elimination of parasites, a 28% parasitaemia decrease without complete cure, with gametocytogenesis in some patients, and a 24% parasitaemia increase. Haemoglobin and temperature results suggested that YIKI was not cytotoxic and reduced fever. Encouraging preliminary results have been obtained, but in view of the low number of patients, further YIKI efficacy and toxicity studies will be necessary for patient safety.

关键词： Antimalarial-Phytomedicine Efficacy Traditional Practices Bobo-Dioulasso

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糖尿病相关的足病的定义和标准(2023年更新版)

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感染、炎症、修复 2024年第1期25卷 80-85页

作者： jaap j.van Netten Sicco A.Bus jan Apelqvist Pam Chen Vivienne Chuter Robert Fitridge Frances game Robert j.Hinchliffe Peter A.Lazzarini joseph Mills Matilde Monteiro-Soares Edgar j.g.Peters Katherine M.Raspovic eric Senneville Dane K.Wukich Nicolaas C.Schaper on behalf of the International Working group on the Diabetic Foot 张会峰(译) 许樟荣(审校) Department of Rehabilitation Medicine Amsterdam UMCLocation University of AmsterdamAmsterdamthe Netherlands Amsterdam Movement Sciences Program RehabilitationAmsterdamthe Netherlands Department of Endocrinology University Hospital of MalmöMalmöSweden joondalup Health Campus Ramsay HealthcareSydneyAustralia Faculty of Health University of TasmaniaHobartAustralia School of Health Sciences Western Sydney UniversitySydneyAustralia Faculty of Health and Medical Sciences University of AdelaideAdelaideAustralia Vascular and Endovascular Service Royal Adelaide HospitalAdelaideAustralia Department of Diabetes and Endocrinology University Hospitals of Derby and Burton NHS Foundation TrustDerbyUK Department of Vascular Surgery University of BristolBristolUK School of Public Health and Social Work Queensland University of TechnologyBrisbaneAustralia Allied Health Research Collaborative The Prince Charles HospitalBrisbaneAustralia Michael E.DeBakey Department of Surgery Division of Vascular Surgery and Endovascular TherapyBaylor College of MedicineHoustonTexasUSA Portuguese Red Cross School of Health–Lisbon LisbonPortugal MEDCIDS–Departamento de Medicina da Comunidade Informação e Decisão em Saúde Faculty of Medicine of the University of PortoPortoPortugal RISE@CINTESIS Faculty of Medicine Oporto UniversityPortoPortugal Department of Internal Medicine Amsterdam UMCVrije Universiteit AmsterdamSection of Infectious DiseasesAmsterdamthe Netherlands Department of Orthopaedic Surgery University of Texas Southwestern Medical CenterDallasTexasUSA Department of Infectious Diseases gustave Dron Hospital Tourcoing Univ-lilleTourcoingFrance Div.Endocrinology MUMC+CARIM and CAPHRI InstituteMaastrichtThe Netherlands 不详河南省人民医院内分泌科河南郑州450003 战略支援部队特色医学中心北京100101

糖尿病相关的足病管理涉及多个学科,通用的专业词汇对于各学科间准确沟通交流至关重要。国际糖尿病足工作组(IWgDF)对相关文献进行了系统综述,构成了制定IWgDF指南的基础,并且明确了糖尿病相关的足病的一系列定义、标准及名词解释。本... 详细信息

糖尿病相关的足病管理涉及多个学科,通用的专业词汇对于各学科间准确沟通交流至关重要。国际糖尿病足工作组(IWgDF)对相关文献进行了系统综述,构成了制定IWgDF指南的基础,并且明确了糖尿病相关的足病的一系列定义、标准及名词解释。本文介绍2023年IWgDF对这些定义和标准的更新,并建议在临床实践和研究中一致使用,以利于世界各地不同学科人员针对糖尿病相关的足病的专业性交流。

关键词：定义糖尿病糖尿病相关的足病国际糖尿病足工作组

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Wheat yield prediction by zero sink and equilibrium-type soil phosphorus tests

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Pedosphere 2022年第4期32卷 543-554页

作者： Walter W.WENZEL Cornelia MESMER eric j.FLORIDA Markus PUSCHENREITER Holger KIRCHMANN Institute of Soil Research Department of Forest and Soil SciencesUniversity of Natural Resources and Life Sciences ViennaKonrad-Lorenz-Straße 24Tulln A-3430Austria College of Agriculture and Forestry Mindanao State University at NaawanNaawan 9023Philippines Department of Soil and Environment Swedish University of Agricultural SciencesBox 701475007 UppsalaLennart Hjelms väg 9Uppsala 75651Sweden

Diffusive gradients in thin films(DgT)measurements have been shown to outperform other phosphorus(P)tests in soils with strong P sorption,but this has not been confirmed for moderately weathered European *** compared the performance of DgT in predicting wheat grain yield in Swedish long-term fertility experiments with those of standard intensity(water-extractable P(P-H2O))and quantity(ammonium lactate-extractable P(P-AL))tests.A Mitscherlich-type model was used to fit wheat yield response to P application rates(0,15,30 or 35,and 45 kg P ha-1 year-1)in each individual trial replicate to estimate the maximum *** trials with clear plateau-type yield responses and the goodness of fit(R2)>0.75,relative yields(RYs)were calculated for each P treatment and plotted against the soil P test results(n=143).The goodness of the Mitscherlich-type fits decreased in the following order:DgT-measured P(P-DgT)(R2=0.35)>P-H2O(R2=0.18)>P-AL(R2=0.13).When excluding soils with P-AL:P-DgT≥0.1 L g-1,R2 was considerably improved to 0.55 for P-AL,0.46 for P-H2O,and 0.65 for P-DgT(n=61).At 95%of maximum yield,the upper limit of P deficiency for P-DgT was 44.8(the soils with P-AL:P-DgTg-1)and 61.9μg L-1(all soils),falling within the range reported for other European and Australian soils(6.0–142μg L-1).We show that in the investigated Swedish soils,DgT performed better than the quantity and intensity tests,which is attributed to its ability to capture P diffusion and resupply from the soil solid phase,similar to plant roots in the rhizosphere.

关键词： ammonium lactate-extractable phosphorus diffusive gradients in thin films(DgT) distribution coefficient long-term field experiment Mitscherlich-type model

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Diffusion weighted imaging in the liver

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World journal of gastroenterology 2010年第13期16卷 1567-1576页

作者： Petra g Kele eric j van der jagt Department of Radiology University Medical Center Groningen University of Groningen

Diffusion weighted magnetic resonance imaging (DWI) is an imaging technique which provides tissue contrast by the measurement of diffusion properties of water molecules within tissues. Diffusion is expressed in an apparent diffusion coefficient (ADC), which reflects the diffusion properties unique to each type of tissue. DWI has been originally used in neuroradiology. More recently, DWI has increasingly been used in addition to conventional unenhanced and enhanced magnetic resonance imaging (MRI) in other parts of the body. The reason for this delay was a number of technical problems inherent to the technique, making DWI very sensitive to artifacts, which had to be overcome. With assessment of ADC values, DWI proved to be helpful in characterization of focal liver lesions. However, DWI should always be used in conjunction to conventional MRI since there is considerable overlap between ADC values of benign and malignant lesions. DWI is useful in the detection of hepatocellular carcinoma in the cirrhotic liver and detection of liver metastases in oncological patients. In addition, DWI is a promising tool in the prediction of tumor responsiveness to chemotherapy and the follow-up of oncological patients after treatment, as DWI may be capable of detecting recurrent disease earlier than conventional *** review focuses on the most common applications of DWI in the liver.

关键词： Diffusion Magnetic resonance imaging Diffusion weighted imaging Benign neoplasms Liver neoplasms

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Social media growth of orthopaedic surgery residency programs in response to the COVID-19 pandemic

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World journal of Orthopedics 2022年第8期13卷 693-702页

作者： joseph S geller Dustin H Massel Michael g Rizzo Ean Schwartz jacob eric Milner Chester j Donnally III Department of Orthopaedic Surgery University of Miami Miller School of MedicineMiamiFL 33136United States Department of Orthopedics University of Miami Miller School of MedicineMiamiFL 33136United States University of Miami Leonard M.Miller School of Medicine University of Miami Miller School of MedicineMiamiFL 33136United States Miller School of Medicine University of MiamiMiamiFL 33136United States Texas Spine Consultants Texas Spine ConsultantsAddisonTX 75001United States

BACKgROUND In the Spring of 2020,residency programs across the country experienced rapid and drastic changes to their application process as a result of the coronavirus disease 2019(COVID-19)*** response,residency programs shifted to virtual events and began harnessing social media to communicate with *** To analyze the changes in social media usage by orthopaedic surgery programs in response to the COVID-19 *** Based on the 2019 residency and fellowship electronic database,accredited US orthopaedic surgery programs were reviewed for social media presence on Instagram and *** 47000 tweets from 2011-2021 were extracted through the Twitter application programming *** extracted:Total number of followers,accounts following,tweets,likes,date of account creation,hashtags,and *** language processing was utilized for tweet sentiment analysis and classified as positive,neutral,or *** data was collected and deemed current as of August 11,*** account foundation date analysis was based on the date recognized as the start of the COVID-19 outbreak in the United States,before or after March 1,*** A total of 85(42.3%)orthopaedic surgery residency program Twitter handles were ***-five(41.2%)programs joined Twitter in the nine months after the 2020 covid *** 2020,there was a 126.6%increase in volume of tweets by orthopaedic surgery residency accounts as compared to *** median number of followers was 474.5(interquartile range 205.0-796.5).The account with the highest number of tweets was Hospital for Special Surgery(@HSpecialSurgery)with 13776 tweets followed by University of Virginia(@UVA_Ortho)with 5063 and Yale(@OrthoAtYale)with *** analysis before 2020 revealed 30.4%positive,60.8%neutral,and 8.8%negative sentiments across ***,the positive sentiment percentage increased in 2020 from 30.4%to 34.5%.Of the 201 ACgME-accredited ortho

关键词： Social media COVID-19 Orthopaedic surgery Residency

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Heat and drought impact on carbon exchange in an age-sequence of temperate pine forests

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Ecological Processes 2022年第1期11卷 108-125页

作者： M.Altaf Arain Bing Xu jason j.Brodeur Myroslava Khomik Matthias Peichl eric Beamesderfer Natalia Restrepo‑Couple Robin Thorne School of Earth Environment and Society and McMaster Centre for Climate ChangeMcMaster University1280 Main Street WestHamiltonON L8S 4K1Canada Department of Biological Sciences University of CalgaryAlbertaCanada Department of geography and Environmental Management University of WaterlooWaterlooONCanada Department of Forest Ecology and Management Swedish University of Agricultural SciencesUmeåSweden School of Informatics Computingand Cyber SystemsNorthern Arizona UniversityFlagstaffAZUSA Department of Ecology and Evolutionary Biology University of ArizonaTucsonAZUSA Department of geography Wilfrid Laurier UniversityWaterlooONCanada

Background:Most North American temperate forests are plantation or regrowth forests,which are actively *** forests are in different stages of their growth cycles and their ability to sequester atmospheric carbon is affected by extreme weather *** this study,the impact of heat and drought events on carbon sequestration in an age‑sequence(80,45,and 17 years as of 2019)of eastern white pine(Pinus strobus L.)forests in southern Ontario,Canada was examined using eddy covariance flux measurements from 2003 to ***:Over the 17‑year study period,the mean annual values of net ecosystem productivity(NEP)were 180±96,538±177 and 64±165 g C m^(–2)yr^(–1)in the 80‑,45‑and 17‑year‑old stands,respectively,with the highest annual carbon sequestration rate observed in the 45‑year‑old *** found that air temperature(Ta)was the dominant control on NEP in all three different‑aged stands and drought,which was a limiting factor for both gross ecosystem productivity(gEP)and ecosystems respiration(RE),had a smaller impact on ***,the simultaneous occurrence of heat and drought events during the early growing seasons or over the consecutive years had a significant negative impact on annual NEP in all three *** observed a similar trend of NEP decline in all three stands over three consecutive years that experienced extreme weather events,with 2016 being a hot and dry,2017 being a dry,and 2018 being a hot *** youngest stand became a net source of carbon for all three of these years and the oldest stand became a small source of carbon for the first time in 2018 since observations started in ***,in 2019,all three stands reverted to annual net carbon ***:Our study results indicate that the timing,frequency and concurrent or consecutive occurrence of extreme weather events may have significant implications for carbon sequestration in temperate conifer forests in Eastern North *** study is one of few globally available t

关键词： Carbon fluxes Net ecosystem productivity Ecosystem respiration Extreme weather events Drought Temperate forest White pine Eddy covariance

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