简介：纸在日本总结了生命周期，环境特征和分布ofLarix起源。开花和fruiting和锥收集和种子存储的方法的时间被介绍。为日本落叶松(LarixkaempferiCarr)和Dahurian落叶松(Larixgmeliniivar.japonicaPilger)的种子萌芽和播种时间的对待的方法被讨论。

简介：幼苗ofLarixleptolepis上的spayingPenzhangjing的实验被进行一年。分别地，在试验性的幼苗的脚的高度生长和直径与控制幼苗相比增加了34.3%和35.5%。变化分析断定Penzhangjing在幼苗的脚在高度和直径的生长上有明显的效果。

简介：

简介：Larixspp.woodisoneofthemajorfast-growingtreespeciesinChina,whichalsohasthemostforeststorageinthenortheastofChina.SeveralkeypropertiesmodificationmethodsandachievementsofLarixspp.woodweresummarizedbasedontheircharacteristics.TechnologyproblemsofpropertiesmodificationandnewuseprospectofmodifiedLarixspp.woodwerealldiscussed.

简介：

简介：AccordingtothecultivatingpracticeofLarixolgensispulpplantation,IRR(Internalrevenuerate)andNPV(Netpresentvalue)weretakenastwoeconomicindicestostudytheeffectofcultivationmeasurementsoneconomicbenefitofLarixolgensispulpforest.Theresultsshowedthattheeconomicbenefitofthistypeofforestiscloselyrelatedtorotationandsiteclass.Highereconomicbenefitcouldbeobtainedwhentherotationisshorterandsiteclassishigher.Theplantingdensityalsohadanobviousinfluenceoneconomicbenefit.Onthebaseofassuringsurvivalrateandconservingrate,thelessthefeeusedinsoilpreparationandyounggrowthtendingis,thehighertheeconomicbenefitis.Theinfluenceofdeterminedsixcultivationmeas-uresoneconomicbenefitinsequencewastherotation-siteclass-density-managementfeelevel-younggrowthtendingin-tensity-soilpreparationmethods.

简介：Inthisresearch,fiveplotsareselectedbasedonstandstorageandproductivityofplantedforestofLarixkaempferi(Japaneselarch)aswellastheirrelationshipwithfactorssuchasforestage,siteconditionandstandden-sity.Throughstandardplotinvestigationandmethodoftrunkanalysis,systematicresearchisconductedonstorageandproductivityoftheplantedforestandtheirrelationshipwithsitecondition.Asshownintheresearch,produc-tivityofplantedforestofLarixkaempferiinlowlatitudeareaishigherthanthatinhighlatitudeareawhilestandproductivityishigherinslightacidsoil.Contentsofpotassiumelementinthesoilhaveconsiderablein?uenceonproductivityoftheLarixkaempferiforest.

简介：

简介：生物资源和营养素(N，P，K，Ca，Mg)存货在各种各样未葬树部件(stemwood，stembark，树枝和叶子)在东北中国在纯Larixolgensis种植园(20，35，53和69岁)的一个年龄序列被确定。结果证明未葬在各种各样的树部件的生物资源分配在stemwood(62%83%)的顺序，树枝(9%21%)，stembark(7%11%)和为所有看台的叶子(1%6%)。到总数的stemwood生物资源的比例未葬而另外的树部件的从20～53岁与看台年龄一致地减少了，但是与看台保持相对不变，增加的生物资源从53和69岁变老。在各种各样的树部件的滋养的分配通常跟随了象生物资源分配的一样的模式(即stemwood>树枝>stembark>叶子)。在到总数的叶子的滋养的存货的比例未葬滋养的存货与增加看台年龄一致地减少了，当那与看台在stemwood增加了时，从20～53岁，但是然后的年龄从53～69岁减少了。为看台的滋养的移动的率在不同记载的计划下面在不同看台年龄被估计，当旋转长度仅仅被弄短到由茎的收获的20年时，证明滋养的移动的率将是未改变的，但是极大地由总数的收获增加了未葬生物资源。滋养的移动的率将是为由起的所有元素的可观的减小，特别为Ca。

简介：TheeconomicbenefitsandoptimalrotationageofLarixkaempferipulpwoodplantationwereanalyzedunderstochasticpulpwoodpriceusingrealoptionsapproachinordertomoreeffectivelymanagementtoL.kaempferipulpwoodplantationinnorthernsub-tropicalalpinearea.Flexiblerotationageandthresholdpricetodifferentstandageofdifferentsiteindexplantationweredeveloped.Theresultindicatedthat:1)theoptimalrotationageofL.kaempferiplantationinsiteindex15,17,19,21was25,23,21and19a,respectively,asthecurrentpulpwoodpriceequals500yuan·m-3,andtheshortestrotationagewas23,20,17and15awhenfacingtobetterprice;and2)Waitoptionshouldbetheoptimumstrategyinanypulpwoodpricelevelwhenthestandageislowerthantheshortestrotationage.

简介：LarixolgensisA.Henry(Changbailarch)isaproductivecommercialspeciesandgoodcandidateforafforestationinnortheastChina.Itiswidelyplantedinlead-stressedsoilswhichcaninduceoxidativedamageinthisplant.Increasingtolerancetolead(Pb)stressisthereforeofkeeninterest.Agreenhouseexperimentwasconductedtoidentifythebiomass,physiologicalresponsesandPbaccumulationofL.olgensisseedlingstoPbstressundersuccinicacid(SA)applicationandtoexploretheinteractionofexogenousSAapplicationsandstressresistance.L.olgensisseedlingswereplantedinPb-stressedorunstressedhapliccambisolsinpots.InPb-contaminatedsoilstheseedlingsweretreateddailywithconcentrationsofSAsolutionsatarateapproximatelyequivalentto0,0.04,0.2,1.0,or2.0mmolkg-1ofsoilfor10,20,and30days,respectively.Pbtreatmentinduceddamageintheseedlingsandledtotheinhibitionofbiomassaccumulationinroots,stemsandleaves,andariseinPbaccumulationinfinerootsandleaves.Malondialdehyde(MDA)contentandelectrolyteleakageinleavessignificantlyincreasedwhileperoxidase(POD)activities,solubleproteinandphotosyntheticpigmentcontentsinleaveswereallreduced.PhysiologicaltoxicitywaspromotedwithincreasingPbtreatmenttimes.WhenPb-stressedseedlingswereexposedtoSA(especially10.0mmolL-1over20days),thephysiologicalresponsesforPb-onlywerereversedandthebiomassofroots,stems,andleavesdramaticallyincreased.SAfacilitatedPbuptakeinfinerootsandleavesbutmorePbaccumulatedinfineroots.TheresultsdemonstratethatexogenousSAalleviatesPb-inducedoxidativeinjuriesandimprovesthetoleranceofL.olgensisseedlingstoPbstress.

简介：Through5yearsofphenologicalobservationsonLarixprincipis-rupprechtiiMayr.inprimaryseedorchardandstudiesonpopulationandindividualsofclones,theannualperiodicphenologicallawswererevealedandtheannualphenologicalperiodictablewasdrawnup.Thecorrelationbetweenvariousphenophases,theairtemperatureandactiveaccumulatedtemperaturewereanalyzedandexpounded.Theauthorsalsoanalyzedthesimilaritiesanddifferencesofphenophasesamongclonalindividualsaswellasthebloomingpropertiesofmaleandfemaleflowersatthesametime.ThisstudycouldprovidetheoreticalreferenceforworkingouttheproductionplanofimprovedvarietiesandothermanagementmeasuresinseedorchardofLarixprincipis-rupprechtii.

简介：以便理解在落叶松种植园在微地点条件和自然新生上变瘦的效果，变瘦的实验在东方辽宁省在Qingyuan县在40-year-oldLarixolgensis种植园被进行，在2003-20的中国(14。Fivethinning处理(0%，10.2%，19.8%，29.7%和40.3%变瘦)在一样的地点上被设计。在变瘦以后，象光合的光子流动密度(PPFD)那样的华盖坦诚和微地点条件，土壤含水量，和土壤温度在一生长期被测量。同时，自然新生的调查在生长期的结束被进行。结果证明华盖坦诚随变瘦的intensities.PPFD和土壤温度的增加增加了，在不同土壤层的土壤含水量与在变瘦以后的华盖坦诚是确实相对的。改革树种类的丰富显著地没增加(p=0.30)自从变瘦，而是新生，在一生长期以后，树种类的密度和频率显著地增加了(p<0.05)。另外，改革树种类的数字增加了，并且增长与单个树种类的特征被相关。改革shade-intoleranttree种类的幼苗的增加的百分比多于阴影容忍的树种类的。在调查新生种类之中，到华盖坦诚的幼苗紧急情况的最大的反应是Phellodendronamurense。这篇论文证实了下列结论：在变瘦以后，改革树种类的变化是有在调查落叶松种植园改革unthinned树和地点条件的树种类，和分发的特征的关联词是影响新生的另外的因素。

简介：Inordertotesttheaccuracyoftheusually-usedfixedcalibrationfactorofthecanopyscannerofLAI-2000formeasuringtheleafareaindex(LAI),aLarixprincipis-rupprechtiiplantationwaschoseninthesmallwatershedofXiangshuihelocatedattheLiupanMountainsofNingxiaHuiAutonomousRegionofNWChina,theLAIwasmeasuredinOctober2010,aperiodfromfullcanopytothetotalfallofneedles,byusingboththeLAI-2000andlitterfallcollectionmethod.Then,acomparisonwasmadebetweentheLAIvaluesdeterminedbythelitter-fallcollectionandthatcalculatedbasedonthefiguresreadfromLAI-2000andthefixedcalibrationfactor(1.49).ItshowedthattheaverageofLAImeasurementsofthe2methodswasveryclose,withadifferenceofonly5%.However,thecalculatedLAIfromLAI-2000wasobviouslyhigherthanthetruevaluesdeterminedbylitter-fallcollectionwhenthecanopywasfullofneedles;andobviouslylowerthanthetruevaluewhenthecanopywassparseafterneedlefalling.ThereasonmaybethatLAI-2000takestheprojectionoftwigsasneedles.So,adynamiccalibrationfactorisneeded,especiallyintheseasonswhentheneedleamountandthepercentageoftwigsprojectionincrownprojectionchangequickly.Therefore,astatisticrelationinaquadraticpolynomialformbetweenthe2seriesofLAIdatawaswellfitted.ThisrelationcanbeusedforamoreaccurateestimationofLAIbasedonthedatareadfromtheeasilyusedcanopyscannerslikeLAI-2000.

简介：Defenceproteinsareakindofchemicaldefencecompounds.Theyplayakeyroleinplantrestrainingbioticandabioticharm.Toilluminateactivitiesofsomedefenseproteinsassociatedwithageorplantfamilyoflarch,thelarchneedleswerecollectedfromtwodifferentfamiliesofKoreanlarch,Larixolgensisandahybridlarch,L.kaempferi×L.gmelinii,respectively,andthentheactivitiesofdefenceproteinsinthoseweretestedusingaUVspectrophotometry.Theresultsshowedthattheactivitiesofprotectiveenzymesatthe16-/17-and19-year-agegroupswerehigherthanthoseattheotheragegroupsinthebothlarchspecies.Whiletheactivitiesofpolyphenoloxidase(PPO)atthe16-/17-year-agegroupandphenylalanineammonia-lyase(PAL)andproteaseinhibitorsatthe19-year-agegroupwerethehighestamongallagegroups.Then,comparedwithL.olgensis,thehybridlarchhadsignificanteffectsontheactivitiesofprotectiveenzymes.TheeffectsofplantfamilyontheactivitiesofPALandchymotrypsininhibitorweresignificantlydifferent,andthenthoseontheactivitiesofPPOwerenotsignificantlydifferent.TheeffectsofthetwofamiliesinL.olgensisontheactivitiesoftrypsininhibitor(TI)weresignificantlydifferent,whilethoseinthehybridlarchontheactivitiesofTIwerecontrary.Toconclusionsshowedthatthedifferentageandplantfamilysignificantlyaffectedtheactivitiesofdefenceproteinsintheneedlesoftwolarchspecies,andthenenhancedthelarchresistancetopests.Thesecouldplayakeyfunctioninforestrytreegeneticimprovementandmanagementinfuture.