简介:AprotocolformicropropagationusingnodalexplantsfrommaturePinusmassonianatreeshasbeendeveloped.Timeofexplantcollectioniscrucialfortheinitialsuccessofasepticculture.ExplantscollectedinearlyMarchgavethehighestpercentageofexplantsurvival(64.5%)andshoot-formingpercentage(52.3%).Thidiazuron(TDZ)concentrationsignificantlyinfluencedshootformation;4lMTDZwasoptimum,with4.8shootsproducedperexplantwithameanlengthof7.1cmafter120daysofculture.Regeneratedshootsrootedfor60daysinbasicmediumwith1lMNAAwerereadyforgrowthinpots.ThisisthefirstreportonplantletregenerationinvitrofrommaturetreesofP.massonianathatprovidesareliablemethodforpropagatingselectedelites.
简介:ThereflectionandtransmissionofLambwavesatoverlapjointsareresearchedbythenumericalmethodandtheexperiments.ThenumericalmethodisusedtosimulatethereflectionandtransmissionofLambwavesatweldswithdifferentwidthson2mm-thickstainlesssteelplates.Thereflectionandtransmissioncoefficientsarecalculatedaswell.Whentheweldswidthislessthan4mm,aquasi-linearcorrelationisobservedbetweenthereflectioncoefficientofSOmodeandtheweldwidth.Incontrasttotheweldwidth,boththegapbetweentwoplatesandthereinforcementheightofwelddonothaveobviouseffectonthereflectioncoefficient.Basedontheresults,weproposethattheweldwidthcouldberapidlymeasuredthroughexaminingtheechoamplitudeofSOmode.Experimentsfurtherconfirmthequasilinearcorrelationandthefeasibilityofourproposedmethod.
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简介:Alongwiththedevelopmentofcomputertechniques,theapplicationofcomputerinthree-dimensionalvisualizationsimulationofplantgrowthprocesshasbeenpaidmoreandmoreattention.TakingCunninghamialanceolataasanexample,themorphologicalparametersfromtheperspectiveofthevisualsimulationweredesignedandthetrees’morphologicalcharacteristicswereanalyzedbasedonthesurveydata.CombinedwithIFS(IteratedFunctionSystem)underthecontrolofthegrowthcurve,byusingObject-orienteddesignmethods,andaccordingtoAPIandmodelrenderingtechnologyprovidedbyDIRECTX9.0,athree-dimensionalvisualizationsystemonthegrowthanddevelopmentofC.lanceolataindividualtreeweredevelopedonthe.NETandDIRECTX9.0platforms,whichrealizedthestaticanddynamicthree-dimensionalvisualizationsimulation.
简介:ToaidinmanagementofCunninghamialanceolata,themaintimberspeciesinSouthernChina,itsvariationofspatialdistributionpatternwasanalyzed.ThreepermanentplotsofC.lanceolataplantationswithapproximatelythesamesiteconditions,setbyChinacontinuousforestinventoryinShunchang,Fujian,wereselected.C.lanceolatagrowthwasdividedintotwostages:youngtrees(5cm≤diameteratbreastheight(DBH)<10cm)andmaturetrees(DBH≥10cm).TheDBHandcoordinatesofeverytree(DBH≥5cm)inthepermanentplotswererecordedin2003and2008.ThefunctionL(r),improvementofRipley’sK(r),thepaircorrelationfunctiong(r),andtheuniformangleindex(W_i)wereusedtoanalyzethespatio-temporalvariationofspatialdistributionpatterns.Thethreepermanentplotshadmeanuniformangleindex(W)between0.494-0.578atlowaltitudes,0.465-0.477atmediumaltitudes,and0.426-0.601athighaltitudes.Resultsshowedthataltitudedidnotaffectthespatialdistributionpattern.TheL(r)andg(r)functioncurvesofmaturetreesweregenerallylowerthanyoungtrees’,i.e.tendtobemorerandomoruniformdistribution.Soregardlessoftheinitialdistributionofyoungormaturetrees,withthepassageoftime,therewasatendencyfortheaggregateddistributiontochangetoarandomdistribution,andarandomdistributiontochangetoauniformdistribution.
简介:StructurehealthmonitoringbasedondiagnosticLambwaveshasbeenfoundtobeoneofthemostpromisingtechniquesrecently.Thispaperhasabriefreviewofthenewdevelopmentsonthismethodincludingthebasicnovelofthemethod,fundamentalsandmathematicsofLambwavepropagation,narrowbandandwidebandLambwaveexcitationmethods,optimizationofexcitationfactorsanddiagnosticLambwaveinterpretationmethods.
简介:BasedonthepreviousstudyoncultivationnutritionofCunninghamialanceolataplantationsoffirstgeneration,thecultivationnutritionofC.lanceolataplantationswithmulti-generationwasstudied.Theresultsshowthattherearesignificantdifferencesinthegrowth,developmentandnutrientassimilationamongC.lanceolataplantationswithdifferentgenerationsandnutritionconditions.ThesedifferencesarecloselyrelatedtothelandfertilitydeclineofC.lanceolataplantations.Thispaperde...
简介:AllfactorsaffectingthePCRsysteminPinusmassonianaLambwereinvestigatedonebyone.TheresultsshowthattheoptimumPCRsystemofEST-SSRwere:2μL10×Buffer(Mg2+Free),30ngtemplateDNA,0.1875mmol/LdNTPs,3.75mmol/LMg2+,8pmolprimerpair,1.0UTaqDNApoly-meraseintotal20μLreactionsystem.Finally,atotalof11isolatesofP.massonianawasusedfortestingthestabilityofthePCRamplification.TheresultsprovethattheoptimumPCRsystemwasstable,reliable,highlyrepetitive.
简介:Approximating-natureforestrymanagementtechniqueapplicationresearchisdevelopedinCiinninghamialanceolataplantationfor17yearsatJiuxianForestFarminSongxiCounty,FujianProvince.TheresultsshowthatthebiodiversityoftheC.lanceolataplantationwasincreasedfrom48.5±3.3to74.6±3.3afteradoptingclose-to-natureforestrymanagementtechniques.Comparedwithconventionalmanagementmethod,thetestedforest’ssoilfertilitywasimproved:thesoilmoisture-physicalpropertiesandsoilexchangepropertieswereameliorated,thesoilnutrientcontentswereincreased;theaveragebreastheight,averagetreeheight,individualvolume,Chinesefirstandvolumeandstandtotalvolumewerepromotedby9.24%-17.64%,8.61%-17.29%,27.94%-58.46%,2.38%-28.64%and8.63%-37.55%,respectively.Theworsethesiteconditions,thegreatertheeffectindexeswithclose-to-natureforestrymanagementtechniqueswereimproved.