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: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: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.
简介:Thepaperelaboratesindetailscertificationmechanismforsustainableforestmanagement,includingthedefinition,contents,objectives,costs,benefits,characteristics,proceduresandimpactsofcertificationaswellasmaincertificationsystems.ItalsointroducesindetailsthelatestprogressanddevelopmentperspectivesofcertificationinChinaandaroundtheworld.Certificationisamarket-basedmechanism,whichaimsatenhancingandstrengtheningthereasonableutilizationofforests.Itusua...
简介:Plantationresourceisanimportantcomponentofforestresources.OverallplantationqualityisnothighinChina,andtheproblemslikelowgrowth,lowpreservingrateandlowproductivityarecommonlyobserved.Thispaperreviewedthehistoricalbackgroundoftheresearchonplantationproductivity,describedfactorsaffectingplantationproductivityincludingsiteconditions,initialplantingdensity,thinningmeasures,groundclearance,andcontinuousplantedalgebraandfertilization.Finally,itwasproposedtocarryoutkeytechnologysystemresearchonplantationproductivitymaintenanceandstrengthentheresearchonthelong-termness,systematicdevelopmentandmulti-purposeofplantationproductivity.