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简介：Heterosisistheuniversalphenomenainnature,anditsformationmechanismhasbeenthefocusofresearch.Onthisbasis,anumberoftheoreticalhypotheseshavebeenproposedforthereasonofheterosis,suchasthedominancehypothesis,epistaticeffect,generegulationnetworks,etc.Forthepastyears,manyresearchershaveattemptedtoelaboratethemechanismofheterosisatphysiological&biochemicallevelandmolecularlevel.Theresultsshowedheterosisplantshaveastrongerphotosyntheticcapacity,relativelywell-developedtissuesandgreateradaptionandbufferingabilitytoexternalenvironment.Theheterosisisoftenmorepronouncedinrelativelylowlight,lowtemperatureandlowCO2concentration.Inaddition,geneticdistance,differencesingeneexpressionandDNAmethylationareallcloselyrelatedwithheterosis.Thisstudyreviewedresearchresultsofforestryandagriculture,anddiscussedthefutureresearchdirectionofthisfield.

简介：Afterthe1992UNConferenceonEnvironmentandDevelopmentinRiodeJaneiro,theconceptofsustainabledevelopmenthasbeenwidelyrecognizedallovertheworld.Morethan100countries,includingChina,haveadoptedsustainabledevelopmentstrategiesaccordingwiththeirownsituations.For20years,

简介：Selenium(Se)isanessentialtraceelement,whichhumansandanimalstakedirectlyorindirectlyfromplants.Thispaperreviewedtherecentresearchprogressonspeciationofseleniumcompoundsinplants,includingthekindsofseleniumcompoundsandtheirmetabolicpathways,andthetechnologyforsampletreatment,separation,anddetermination.Organicseleniumcompoundsarethemajorpartsoftheseleniumspeciationinplants.Thetechnologyofultrasonic-microwavesynergisticextractioncombinedwithenzymatichydrolysisisusefulinsamplepreparation.HPLC-ICP-MSiswidelyusedindeterminingseleniumspeciation.Itisimportanttodevelopmorestandardseleniumcompoundsandpaymoreattentiontoselenoproteininplants.ESMS,ESMS-MSandMALDI-TOFcanbeappliedtoidentifyingtheunknownseleniumcompounds.TheapplicationofIDAindeterminingboththemetabolicpathwaysandthestructureoflargeseleniummoleculeswillbeamajoraspectforthefutureresearch.

简介：Afterreviewingalargequantityofliteraturesathomeandabroad,thenaturalregenerationbarriermechanismsofforestweredescribed,includinglackofseed,animaleatingandtrespass,plantsallelopathy,microbialpathogenesis,unusualstateofecologicalfactorslikelight,temperature,humidityandrainfall,physicalobstructofunderstorygroundcoverandlitters,naturalandhumandisturbanceanddifferenceforestcommunitycharacteristics.Thepaperfinallycameupwiththeproblemsexistinginthecurrentresearchandthedevelopmentideaoftheresearch.

简介：Thispapersummarizes,fromaglobalperspective,themajorprogressintheimplementationoftheAgenda21sincetheUNConferenceonEnvironmentandDevelopment.Theresultsshowthatglobaleconomyhasachievedasubstantialgrowth,andpositiveprogresshasbeenmadeinpovertyeradication,urbanization,andconservationandintensiveuseofnaturalresources.However,relevantinternationalconventionsandcommitmentshavenotyetbeencompletelyfulfilled.Thepaperfurtheranalyzesthecurrentmajorchallengesandfuturetrendsofglobalsustainabledevelopment.Itisarguedthattherearethreemajorchallenges:1)fatalglobalenvironmentalissuesposinganincreasingthreattohumansurvival;2)moreandmoresevereglobalcompetitionfordevelopingspaces;and3)issueshighlightingglobalpeople'slivelihood.Therearefourtrendsofglobalsustainabledevelopment:1)sustainabledevelopmentwillfurtherturnfromconceptintoglobalaction;2)greenwillbethemaintrendofglobaldevelopment;3)emergingdevelopingcountrieswillbecomethemaindrivingforceofglobalsustainabledevelopment;and4)internationalrelationsinthefieldofsustainabledevelopmentwillturntocompetitiveco-operation.

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简介：Thepatternofprecipitation,includingprecipitationamount,frequencyandintensity,maychangeinthefutureaccordingtothepredictionofclimatechange.Inaridzones,thesoildynamics,plantgrowthandvegetationchange,desertificationandhydrologymightbeaffectedbyprecipitationchange.Ingeneral,theprecipitationinextremearidzoneandaridzoneshowedanincreasetendencywhereastheprecipitationinsomeareainsemi-aridzoneandsub-humidaridzoneshowedadecreasetendency.Theincreaseofprecipitationcouldenhancethegrowthofbiologicalsoilcrust,improvesoilwaterstatus,promoteplantgrowth,increasevegetationcoverage,facilitatethechangefromdesertvegetationtograsslandvegetation,anditisbenefittothereversionoflanddesertification.Inaddition,theincreaseofprecipitationcouldalsoincreasetheriverrunoff,lakestorageandpromotetheoccurrenceofflood,whilethedecreaseofprecipitationhastheadverseeffect.Thesestudieswillbenefitthepredictionofthepossibleresponseofecosystemprocessestothepotentialchangeofprecipitationpatterninaridzonesinthefuture,anditisimportanttotheconservationofnaturalvegetationandthecontrolofdesertification.Morefieldexperimentsandstudiesshouldbeconductedinthefuture,includingtheeffectofincreasedprecipitationortemperature,nitrogendepositionandCO2onsoil,vegetation,desertificationandhydrologyofaridzones,soasthemorepersuasiveresultscouldbeobtainedfromtheseexperimentsandstudies.

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简介：Plantationresourceisanimportantcomponentofforestresources.OverallplantationqualityisnothighinChina,andtheproblemslikelowgrowth,lowpreservingrateandlowproductivityarecommonlyobserved.Thispaperreviewedthehistoricalbackgroundoftheresearchonplantationproductivity,describedfactorsaffectingplantationproductivityincludingsiteconditions,initialplantingdensity,thinningmeasures,groundclearance,andcontinuousplantedalgebraandfertilization.Finally,itwasproposedtocarryoutkeytechnologysystemresearchonplantationproductivitymaintenanceandstrengthentheresearchonthelong-termness,systematicdevelopmentandmulti-purposeofplantationproductivity.

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简介：ObjectiveAlongwithchangesintheecologysystemandundertheinfluenceofvariousenvironmentalfactors,theincidenceoftumorhasbeenincreasingyearafteryear.Thereisatrendincancertherapytomovetocombinedtherapiesinvolvingsurgery,radiationchemotherapyandgenetherapy.Cancergenetherapyinrecentyearshasbroughtnewopportunitiesfortreatmentoftumor.Itsadvantagesincludelowrateoftolerance,insensitivitytocellcycles,highspecificityandcoverageforbothprimaryandmetastatictumors1,2.However,thisisanewfieldofclinicalresearch.RegardingthecorrelationamongtheSTAT3,CyclinD1andP21genesandtumors,researchhasfocusedontheirexpressionandregulation.Thisarticleprovidesasummaryofrelatedresearch.