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Legum. Gr.en m.nur. and Inter.r.pping for.High Biom.ss Sor.hum.Pr.duction

Agr.cultur.l Sciences 2024年第6期15卷 605-621页

作者： Clar. B. Neely Fr.ncis m. r.uquette Jr. Cr.stine L. S. m.r.an Fr.nk m. Hons William.L. r.oney Ger.ld r. Sm.th Depar.m.nt of Soil and Cr.p Science Washington State University Pullman WA USA Texas A&m.Agr.Life r.sear.h Overton TX USA Soil Health Institute Morrisville NC USA Depar.m.nt of Soil and Cr.p Science Texas A&M University College Station TX USA

Befor. the advent of cheap, synthetic fer.ilizer., legum.s wer. com.only used as gr.en m.nur. cr.ps for.their.ability to fix atm.spher.c nitr.gen (N). A thr.e-year.study at Over.on, TX exam.ned legum. integr.tion into high-biom.ss sor.hum.(Sor.hum.bicolor.L.) pr.duction system. on a Lilber. loam. fine sand r.cently cultivated after.a fer.ilized ber.udagr.ss [Cynodon dactylon (L.) Per..] pastur.. In this split-split plot design, ‘Dixie’ cr.m.on clover.(Tr.folium.incar.atum.L.) and ‘Ir.n and Clay’ cowpea (Vigna unguiculata L.) wer. integr.ted into a high-biom.ss sor.hum.pr.duction system.to evaluate im.acts on N concentr.tion, C concentr.tion, and yield of high-biom.ss sor.hum.and their.im.acts on soil total N and soil or.anic car.on (SOC). m.in plots wer. split into cr.m.on clover.gr.en m.nur. (CLGm. and winter.fallow (FALL) followed by thr.e sub-plots split into war.-season cr.p r.tations: cowpea gr.en m.nur. (CPGm., cowpea-sor.hum.inter.r.p (CPSr., and sor.hum.m.nocr.p (SOr.). Thr.e N fer.ilizer.tr.atm.nts (0, 45, 90 kg N∙ha−1) wer. r.ndom.zed and applied as sub-sub plots. The CLGm.incr.ased (P sor.hum.biom.ss yield (16.5 t Dm.ha−1) 28% in year.thr.e but had no effect in the fir.t two year.. The CPSr.tr.atm.nt r.duced sor.hum.yield up to 62% com.ar.d to SOr.;wher.as CPGm.incr.ased sor.hum.yield 56% and 18% the two year. following cowpea incor.or.tion. r.te of N fer.ilizer.had no effect on sor.hum.biom.ss yield. Decr.ase in SOC and soil N over.tim. indicated m.ner.lization of or.anic N and m.y explain why no N fer.ilizer.r.sponse was obser.ed in sor.hum.biom.ss yield. Cowpea showed str.ng potential as a gr.en m.nur. cr.p but pr.ved to be too com.etitive for.successful inter.r.pping in high-biom.ss sor.hum.pr.duction system..

关键词： High-Biom.ss Sor.hum Legum.s Gr.en m.nur. Inter.r.p Cowpea Cr.m.on Clover Soil Or.anic Car.on Soil Nitr.gen

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r.view and Analysis: Evaluation of the Im.acts and Consequences of Using Agr.cultur.l Her.icides as m.litar. Chem.cal Weapons in Second Indochina War

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Open Jour.al of Soil Science 2024年第8期14卷 471-498页

作者： David r. Speidel Kenneth r. Olson USDA r.sour.e Conser.ationist and Agr.cultur.l Consultant with Natur.l r.sour.e Conservation Service and Foreign Agricultural Service Benton Missouri USA College of Agr.cultur.l Consumer and Environmental Sciences University of Illinois Urbana USA

The legacy of the hum.n m.ser. caused by the application of the her.icides including Agent Pur.le and Agent Or.nge contam.nated with unknown am.unts of dioxin TCDD and Agent Blue, the ar.enic-based her.icide, spr.yed over.the jungles, r.ce fields, and ham.ets of Vietnam.is still haunting us today. Why did this happen? Could it have been pr.vented? Was it necessar. United States m.litar. str.tegy? Was it an intentional decision to inflict this blight on the enem. soldier. and the Vietnam.se, Cam.odian, and Laotian civilians, to poison their.land and cause gener.tions of har.? Alter.atively, was it an unpr.ventable accident in the m.r.h of m.litar. histor.? What patter.s in the U.S. gover.m.nt’s thought pr.cess could be identified as the cause, which led to the decision to use these her.icides as tactical chem.cal weapons? If the intr.duction of her.icide (chem.cal) weapons had not been m.de, would the outcom. of the Vietnam.War.and the Secr.t War. in Laos and Cam.odia have been any differ.nt? The objective of this tr.atise is to outline the r.le of wor.d events and backgr.unds and the r.le of the leader., U.S. m.litar., CIA, USDA, U.S. State Depar.m.nt, the U.S. Pr.sident appointed Am.assador. to Vietnam.and Laos, chem.cal com.anies, and Pr.sident Diệm.s r.public of Vietnam.(r.N) gover.m.nt and m.litar.. Their.collective advice led to the decision to use her.icides as m.litar. and envir.nm.ntal chem.cal weapons in the Second Indochina War. Wer. the National inter.sts achieved by U.S. m.litar. str.tegy in the r.N using her.icide weapons wor.h the long-ter. envir.nm.ntal and hum.n health consequences in Vietnam. Cam.odia, and Laos? Did it im.act the outcom. of the Second Indochina War.

关键词： Second Indochina War Cam.odia Laos South Vietnam Vietnam.War Tactical Her.icides Agent Blue Agent Or.nge Agent Pur.le Dioxin TCDD Ar.enic

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Aer.dynam.cs of a Tandem.Bladed Axial Com.r.ssor.r.tor.under.Cir.um.er.ntial Distor.ion at Differ.nt r.tational Speeds

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Jour.al of Ther.al Science 2024年第4期33卷 1340-1356页

作者： Am.t KUm.r.Jer.y T.JOHN A.m.Pr.DEEP r.A.DAKKEr.ANS Dr.gan KOZULOVIC Depar.m.nt of Aer.space Engineer.ng Indian Institute of Technology BombayMumbai400076India Depar.m.nt of Autom.tive and Aer.nautical Engineer.ng Hamburg University of Applied Sciences20099HamburgGermany Institute of Jet Pr.pulsion Bundeswehr University Munich85577NeubibergGermany

For.m.st air.r.ft engines,inflow distor.ion is *** distor.ion is known to degr.de the aer.dynam.c per.or.ance and stable oper.ting lim.ts of a *** r.tor.configur.tion is an ar.angem.nt that effectively contr.ls the gr.wth of the boundar. layer.over.the suction sur.ace of the ***,a higher.total pr.ssur. r.se can be achieved thr.ugh this unconventional design appr.ach involving the splitting of the blade into for.ar. and aft *** is expected that the effect of inlet flow distor.ion would be m.r. sever. for.a tandem.r.tor.design due to the gr.ater.flow tur.ing inher.nt in such ***,this aspect needs to be thor.ughly *** pr.sent study discusses the effect of cir.um.er.ntial distor.ion on the tandem.r.tor.at differ.nt r.tational ***-annulus r.NS sim.lations using ANSYS CFX ar. used in the pr.sent *** per.or.ance of the r.tor.at a par.icular.flow coefficient and differ.nt r.tational speeds is *** total pr.ssur. and efficiency ar. obser.ed to dr.p at lower.m.ss flow r.tes under.the influence of cir.um.er.ntial *** loss r.gion in each blade passage is m.inly associated with the blade wake,tip leakage vor.ex,secondar. flow,and boundar. ***,their.contr.bution var.es fr.m.passage to passage,par.icular.y in the distor.ed *** the lower.span,the wake width is found to be higher.than that at a higher.*** to the r.distr.bution of the m.ss flow,the cir.um.er.ntial extent r.duces at a higher.*** the undistor.ed sector.the str.ngth of the tip leakage vor.ex is significantly higher.at the design r.tational speed than at lower.*** distor.ion near.the tip r.gion pr.m.tes an ear.y vor.ex br.akdown even at the design oper.ting *** adver.ely affects the total pr.ssur.,efficiency,and stall *** clean flow conditions,this phenom.non is only obser.ed near.the stall *** the design oper.ting condition,the br.akdown of the for.ar. r.tor.tip l

关键词： tandem.r.tor cir.um.er.ntial distor.ion loss tip leakage vor.ex vor.ex br.akdown diffusion factor aer.dynam.cs of com.r.ssor.blade

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Eur.pium.r.cover. pr.cess by m.ans of polym.r.c nanopar.icles functionalized with acr.lic acid,cur.um.n and fum.r.m.de

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Jour.al of r.r. Ear.hs 2024年第10期42卷 1950-1959页

作者： P.A.m.r.ínez-m.ntoya J.m.del r.o A.de J.m.r.les-r.m.r.z m.Cor.a Escuela Super.or.de Ingenier.a Quím.ca e Industr.as Extr.ctivas ESIQIE-IPNDepartamento de Ingeniería Metalúrgica UPALM S/N Col.LindavistaGustao A.MaderoCDMXC.P.07738Mexico Escuela Super.or.de Ingenier.a Quím.ca e Industr.as Extr.ctivas ESIQIE-IPNLaboratorio de Investigación en Polímeros y NanomaterialesUPALM S/N Col.LindavistaGustavoA.MaderoCDMXC.P.07738Mexico Centr. de Investigación e Innovación Tecnológica CIITEC-IPNCda.de CECATIs/nSanta CatarinaAzcapotzalcoC.P.02250CDMXMexico

Polym.r.c nanopar.icles of poly(m.thyl m.thacr.late)wer. obtained by em.lsion polym.r.zation techniques in a pr.ce ss of two *** par.icles wer. functionalized with acr.lic acid,cur.um.n,and fum.r.m.de and thr.e ser.es of polym.r.c par.icles wer. *** incor.or.tion of functional gr.ups was confir.ed by Four.er.tr.nsfor.-infr.r.d spectr.socopy(FT-Ir.and ultr.violet-visible(UV-Vis)*** spher.cal m.r.hology of par.icles with an aver.ge diam.ter.of 100 nm.was obser.ed by scar.ning electr.n m.cr.scopy(SEm..The polym.r.c m.ter.als wer. used for.r.cover. of[Eu]fr.m.synthetic *** nanopar.icles show excellent chelation capacity to tr.p r.r.-ear.h ions,because they r.cover.m.r. than 85%of[Eu]at pH of *** im.ges of SEm.after.extr.ction pr.cess show ar.ays between par.icles with lar.er.aver.ge par.icle sizes to 1.5 *** addition,the par.icles have a good str.pping capacity,exceeding 50%of it,m.intaining their.hom.geneity in m.r.hology and good stability in disper.ion for.the r.cover. and str.pping pr.cesses.A pseudo-second m.del or.er.is obtained for.the extr.ction and str.pping pr.cesses while the best r.sults of str.pping pr.cess ar. obtained at pH of 6.

关键词： [Eu]r.cover. Chelating effect Extr.ction pr.cess Str.pping pr.cess Em.lsion polym.r.zation r.r. ear.hs

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Influence of er.ium.on str.ctur.l,and char.ed par.icles,photons,and neutr.ns shielding pr.per.ies of Ba_(1-x)Er.(x)SnO_(3) per.vskite cer.m.cs

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Jour.al of r.r. Ear.hs 2024年第4期42卷 724-732页

作者： m.K.h.Ham.d Nidal Dwaikat m.H.A.m.ar.b m.I.Sayyed r.m.Ham.d Y.S.m.Alajer.m. m.A.Alm.ssier. Gam.el Saleh Ahm.d Hussein Alom.r. K.A.Ziq Depar.m.nt of Basic Sciences School of Social and Basics SciencesAl Hussein Technical UniversityKing Abdullah II St 242Amman11831Jordan Depar.m.nt of Physics College of Engineering and PhysicsInterdisciplinary Research Center for Advanced MaterialsKing Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Depar.m.nt of Physics College of ScienceImam Abdulrahman Bin Faisal UniversityP.O.Box 1982Dammam31441Saudi Arabia Basic and Applied Scientific r.sear.h Center Imam Abdulrahman Bin Faisal UniversityP0.Box 1982Dammam31441Saudi Arabia Depar.m.nt of Physics Faculty of ScienceIsra UniversityAmman11622Jordan Depar.m.nt of Nuclear.m.dicine r.sear.h Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityPo.Box 1982Dammam31441Saudi Arabia m.dical Im.ging Depar.m.nt Applied Medical Sciences FacultyAl Azhar University-Gaza CityPo.Box 1277Palestine Depar.m.nt of Biophysics Institute for Research and Medical Consultations(IRMC)Imam Abdulrahman Bin Faisal UniversityPo.Box1982Dammam 31441Saudi Arabia Depar.m.nt of Biom.dical Engineer.ng College of EngineeringImam Abdulrahman Bin Faisal UniversityPo.Box 1982Dammam31441Saudi Ener.y&m.ner.ls r.gulator. Com.ission Amman11821Jordan

Five per.vskite cer.m.cs sam.les of Ba_(1-x)Er.(x)SnO_(3) with x=0.00,0.05,0.10,0.15,and 0.20 wer. synthesized using the conventional solid-state r.action *** pr.par.d sam.les wer. char.cter.zed by X-r.y diffr.ction(Xr.),Four.er.tr.nsfor.s infr.r.d(FTIr.,and UV-Vis *** shielding pr.per.ies against ionizing r.diation wer. also *** Xr. analysis shows the per.vskite cubic str.ctur. as the m.jor.phase in all *** FTIr.r.veals a distinctive band ar.und 614-620 cm.(-1) ascr.bed to the antisym.etr.c O-Sn-O ***-Vis spectr.scopy was used to deter.ine the bandgap accor.ing to diffuse r.flectance,and the r.sults display a fixed enhancem.nt in the bandgap fr.m.3.2 to 3.3 eV for.all ***-r.y shielding pr.per.ies of the synthesized sam.les wer. exper.m.ntally m.asur.d and com.ar.d with XCOm.com.utational *** r.lative differ.nces(Δ,%)between exper.m.ntal and theo r.tical values ar. low and fall within the 0.446%-7.10%*** addition of Er.leads to the enhanced density,neutr.n,and gam.a shielding *** contr.st,char.ed par.icles’shielding par.m.ter. gr.dually r.duce with r.sing Er.*** r.sults suggest that Ba_(1-x)Er.(x)SnO_(3) sam.les can be used in differ.nt r.diation shielding applications.

关键词： Per.vskite Cer.m.cs Gam.a r.y shielding m.ss stopping power r.r. ear.hs

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Vaccination effect on a stochastic epidem.c m.del with healing and r.lapse

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Inter.ational Jour.al of Biom.them.tics 2024年第1期17卷 29-59页

作者： m.m.Abdeslam. L.Basr. m.El Fatini I.Sekkak r.Taki Labor.tor. of Par.ial Differ.ntial Equations Spectr.l Algebr. and Geom.tr. Depar.m.nt of m.them.tics Faculty of Sciences Ibn Tofail UniversityBP 133KénitraMorocco Centr. de r.cher.he en Sante Publique m.ntr.al(Québec)H3N 1X9 Canada Departement de Medecine Sociale et Preventive Ecole de SantéPublique de I'Universitéde Montreal 101Avenue du ParcMontréal(Quebec)H3N 1X9Canada EST Sidi Bennour Chouaib Doukkali UniversityEl JadidaMorocco

In this wor.,we consider.a stochastic epidem.c m.del with vaccination,healing and *** pr.ve the existence and the uniqueness of the positive *** establish sufficient conditions for.the extinction and the per.istence in m.an of the stochastic ***,we also establish sufficient conditions for.the existence of er.odic stationar. distr.bution to the m.del,which r.veals that the infectious disease will *** gr.phical illustr.tions of the appr.xim.te solutions of the stochastic epidem.c m.del have been per.or.ed.

关键词： Stochastic epidem.c m.del with r.lapse and healing vaccination extinction per.istence in m.an m.r.ov sem.gr.up stationar. distr.bution

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Kaoline-based catalyst for.a high stability desulfur.zation of sour.heavy naphtha in a thr.e-phase oscillator. baffled r.actor

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Par.icuology 2024年第1期84卷 249-260页

作者： Hassan m.Hm.od Saba A.Gheni Safaa m.r.Ahm.d m.dheher.m.Ali Ham.d Yonis Saleh m.ham.ed H.m.ham.ed Awad E.m.ham.ed m.r.an A.m.hom.od Hiba r.m.ham.ed Ahm.d A.Hassan Adam.Har.ey Nor.h r.finer.es Com.any Ministry of OilIraq Chem.cal Engineer.ng Depar.m.nt Tikrit UniversityIraq m.nistr. of Oil Iraq AL-Hawija Technical Institute Northern Technical UniversityMoselIraq School of Engineer.ng Newcastle UniversityUK

To m.et the r.pidly incr.asing dem.nd for.ener.y and the dr.m.tic depletion of conventional cr.de oil,it is im.er.tive to utilize sour.*** no coke being pr.duced,oxidative desulfur.zation(ODS)of naphtha lower. its sulfur.content and aver.ge m.lecular.*** this ar.icle,we outline a m.thod for.heavy naphtha non-extr.ctive ODS using a ver. stable *** technique involves the use of a solid catalyst with oxygen gas as the *** necessitated r.latively high m.xing intensities;hence a thr.e-phase Oscillator. Baffled r.actor.OBr.was *** catalyst was based on the zeolite ZSm.5,pr.par.d fr.m.natur.l kaolin by a ser.es of delam.nation and activation steps and im.r.gnated with Fe.A TiO2 nanolayer.was applied,using the sol-gel m.thod,to pr.vent r.pid *** r.actor.per.or.ance was evaluated to m.nim.ze the sulfur.content in the naphtha *** to the pr.tective coating,the sulfur.conver.ion stabilized at 90%.The r.sults of this wor. establish the use of natur.l clay-based catalysts in a continuous,thr.e-phase ODS,par.icular.y with r.gar. to pr.ving long-ter. *** also showed that m.dest ODS can be achieved using an envir.nm.ntally fr.endly oxidant,at m.ld oper.ting conditions,whilst m.intaining stability.

关键词： Natur.l kaoline Desulfur.zation Thr.e-phase Oscillator. baffled r.actor

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Evidence-Based Com.lem.ntar. and Alter.ative m.dicine Effects of Capybar. Oil on Car.iac r.m.deling of C57bl/6 m.ce

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Jour.al of Biosciences and m.dicines 2024年第5期12卷 213-232页

作者： r.fael m. Alm.ida Wagner.D. Giannetti Guilher.e r. Silveir. Car.lina r. Castilho r.nata V. Lisboa Bianca T. Ciam.ar.lla r.dr.go N. Fer.eir. Jor.e José de Car.alho Labor.tor. of Ultr.str.ctur. and Tissue Biology Institute of Biology State University of Rio de Janeiro Rio de Janeiro Brazil Higher.Education Center.of Valenç a Dom Andr&#233 Arcoverde Educational Foundation Valen&#231a Brazil

Car.iovascular.diseases ar. the m.in cause of m.r.idity and m.r.ality in the wor.d, and obesity and the m.tabolic syndr.m. ar. r.sk factor. for.its developm.nt. One of the ther.pies to r.duce car.iovascular.r.sk is the use of polyunsatur.ted fatty acids. In Br.zil, a sour.e of such acid is the oil extr.cted fr.m.the fat of the capybar.. The objective of this wor. is to study the effects of the capybar. oil on lipid and glucose m.tabolism. as well as its effects on the adipose tissue and car.iac r.m.deling. We assessed the effects of capybar. oil tr.atm.nt on body m.ss, lipid and car.ohydr.te m.tabolism. systolic blood pr.ssur., adipose tissue and car.iac r.m.deling, and per.or.ed an ultr.str.ctur.l evaluation of the m.ocar.ium.in C57Bl/6 m.ce tr.ated with high-fat diet. Tr.atm.nt with capybar. oil r.duced total cholester.l and tr.glycer.de levels, systolic blood pr.ssur., viscer.l and subcutaneous adipose tissue, and adipocyte diam.ter. In addition, car.iac r.m.deling was attenuated, pr.ser.ing car.iom.ocytes, incr.asing vascular.zation, r.ducing car.iom.ocyte hyper.r.phy and the extr.cellular.m.tr.x, and pr.ser.ing the m.r.hological integr.ty of m.tochondr.a. Capybar. oil has sever.l beneficial effects on the car.iovascular.and m.tabolic system. and fur.her.studies ar. needed to better.under.tand its r.le in the pr.vention or.tr.atm.nt of car.iovascular.diseases.

关键词： Capybar. Oil Car.iac r.m.deling Polyunsatur.ted Fatty Acids Obesity m.tabolic Syndr.m.

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Adult Ur.logical Cancer. at Zinder.National Hospital

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Open Jour.al of Ur.logy 2024年第5期14卷 267-276页

作者： Halidou m.azou m.nzo m. S. Ousm.ne Chaibou Soum.na Abdoulaye Kodo Idr.ssa Ser.ba Abdoulr.zak r. H. Zakou Soum.na Am.dou Depar.m.nt of Ur.logy University of Zinder Zinder Niger Depar.m.nt of Ur.logie University of Niamey Niamey Niger Depar.m.nt of m.#233 dicale Oncology National H&#244pital of Zinder Zinder Niger Depar.m.nt of Anatom. Pathology Universit&#233 of Zinder Zinder Niger

The aim.of this study was to pr.sent the epidem.ological, clinical and ther.peutic aspects of adult ur.logical cancer. in the depar.m.nt of ur.logy at Zinder.National Hospital. Patients and m.thods: This was a cr.ss-sectional study of adult pr.m.r. ur.logic cancer. dur.ng the per.od of Januar. 2019 to Decem.er.2023. Data wer. obtained fr.m.the r.cor. of patients adm.tted to ur.logy, and the m.dical oncology depar.m.nt. The par.m.ter. studied wer.;fr.quency, age, sex, ur.genital distr.bution, anatom.pathological type, and ther.peutic aspects. Data wer. r.cor.ed on Excel 2013 and analyzed with Epi-info ver.ion 7.2.5. r.sults: Epidem.ology: About 289 cancer. wer. diagnosed thr.ugh 6017 consultations dur.ng the per.od, cor.esponding to 4.80% of ur.logical pathologies: pr.state cancer.(n = 221;76.47%), bladder.cancer.(n = 46;15.92%), kidney cancer.(n = 13;04.5%), testis cancer.(n = 09;03.11%). m.dian age of patients was 50.42 year.. Pr.state cancer. was Adenocar.inom. in 100% (n = 221) with Gleason scor.s > 7 (77.83%) and pr.statique specific antigen (PSA) > 20 ng/m. in 90.04%. Extension evaluation 134 cases (60.63%). Tr.atm.nt was chir.r.ical castr.tion in (62.44%) and r.sistance to castr.tion appear.d between 8 and 11 m.nths. Hospital m.r.ality for.pr.state cancer.was 16.29%. Bladder.cancer.was found in 46 cases with Sex r.tio 7/1. Cystoscopy was per.or.ed for.all. Histology r.vealed squam.us cell car.inom. (n = 41;89.13%), and (n = 5;10.87%) ur.thelial. Endoscopic r.section per.or.ed (n = 14;30.43%). Kidney cancer. wer. 13 cases (10 m.n, 03 wom.n). Nephr.ctom. was per.or.ed in (n = 8;61.54%) cases and Histology r.vealed r.nal cell cancer.in 76.92%. Testicular.cancer. wer. diag 09 cases. Histor. of cr.ptor.hidism.was found in 4 cases, 4-year.infer.ility in 3 cases. Or.hidectom. was done in all cases. Chem.ther.py in 3 cases. Conclusion: ur.logical cancer. ar. fr.quent, dom.nated by pr.state cancer. The endem.city of bilhar.iasis has incr.ased squam.us cell car.inom.. T

关键词： Ur.logic Cancer. Epidem.ology Histology Zinder

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Dr.ught events influence nutr.ent canopy exchanges and gr.en leaf par.itioning dur.ng senescence in a deciduous for.st

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For.st Ecosystem. 2024年第1期11卷 110-119页

作者： J.Touche C.Calvar.so P.De Donato m.-P.Tur.ault INr.E BEFF-54000NancyFrance Um.0}7359 GeoRessourcesFaculte des Sciences-Campus des Aiguillettes54506Vandoeuvre Les NancyFrance EcoSustain Environmental Engineering OfficeResearch and DevelopmentKanfen57330France

The incr.ase in the fr.quency and intensity of dr.ught events expected in the com.ng decades in Wester. Eur.pe m.y distur. for.st biogeochem.cal cycles and cr.ate nutr.ent deficiencies in *** possible or.gin of nutr.ent deficiency is the distur.ance of the par.itioning of the gr.en leaf pool dur.ng the leaf senescence per.od between r.sor.tion,foliar.leaching and senesced ***,the effects of dr.ught events on this par.itioning and the consequences for.the m.intenance of tr.e nutr.tion ar. poor.y *** exper.m.nt in a beech for.st in m.use(Fr.nce)was conducted to assess the effect of dr.ught events on nutr.ent canopy exchanges and on the par.itioning of the gr.en leaf pool dur.ng the leaf senescence *** aim.was to identify potential nutr.tional consequences of dr.ughts for.*** nutr.ent dynam.cs,including r.sor.tion,chem.str. of gr.en and senesced leaves,foliar.absor.tion and leaching in m.tur. beech stands fr.m.2012 to 2019 allowed us to com.ar. the nutr.ent exchanges for.thr.e nondr. and thr.e dr. year.(i.e.,with an intense dr.ught event dur.ng the gr.wing season).Dur.ng dr. year.,we obser.ed a decr.ase by alm.st a thir. of the potassium.K)par.itioning to r.sor.tion(*** efficiency),thus r.ducing the K r.ser.e in tr.es for.the next gr.wing *** r.sult suggests that with the incr.ased dr.ught fr.quency and intensity expected for.the com.ng decades,ther. will be a r.sk of potassium.deficiency in tr.es,as alr.ady obser.ed in a r.infall exclusion exper.m.nt on the sam. study *** foliar.leaching and higher.par.titioning to the senesced leaves for.K and phosphor.s(P)wer. also *** addition,a slight incr.ase in nitr.gen(N)r.sor.tion efficiency occur.ed dur.ng dr. year. which is m.r. likely to im.r.ve tr.e *** calcium.Ca)negative r.sor.tion decr.ased,with no appar.nt consequence in our.study *** r.sults show that nutr.ent exchanges in the canopy and the par.itioning of the gr.en leaf

关键词： Natur.l dr.ught Beech for.st Canopy r.sor.tion Foliar.leaching Senesced leaves Nutr.tion

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