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

简介：ComparedwiththespeciesofLeucesection,thedifficultyinplantregenerationduringtissuecultureforthespeciesofAigeirossectionisakeylimitingfactorfortheirapplicationingeneticengineeringofforesttrees.Inthisstudy,theplantgrowthregulatorscombination,copperconcentration,lightintensity,andtheselectionpressuresofkanamycinwereinvestigatedusingleavesofPopulus×euramericanacl.’Bofeng’asexplants,andastableandhighefficientregenerationsystemwasestablished.Usingthissystem,boththeshootregenerationrateandrootingratewereupto100%,andtheaveragenumberofdifferentiatedshootsineachleafexplantwasupto20,andthesurvivalrateofseedlingsreached98%.Theoptimalselectionpressureofkanamycininshootinducementforleaf-explantwas40mg·L-1,andtheoptimalselectionpressureofkanamycininrootinducementofadventitiousbudwas20mg·L-1.TheauthorsalsofoundthatdifferentiationrateofadventitiousbudsofP.×euramericanacl.’Bofeng’couldbesignificantlypromotedbyincreasedcopperconcentration,andthisisthefirstreportaboutthekeyroleofcopper（Cu）inexplantregenerationofPoplars.ThisregenerationsystemwithhighfrequencywhichwasestablishedbytheauthorswasasgoodasthatofspeciesofLeucesection,anditprovidesagoodtechnologicalplatformforgeneticengineeringofforesttreewhichusesthespeciesofAigeirossectionasmodelmaterials.

简介：Byinvestigation,thethesisanalysesandsummarizestheforminganddevelopingofCHFRPInXupucounty.WeselecttheMayandongstockcooperationforestfarmasobject,adoptthemethodssuchassemi-structureinterview,analysingseconddataandsurveyingsampleplots,analyseandstudytheprocesstoclarifythepropertyright,theprofitsallocatedformsandthemanagementforms.TheresultsshowthatCHFRPcantentativelyresolvethecontradictionbetweentheforestlandusingrightscatteredtoeve...

简介：Inordertoselectasuitablegenotypeforthestudiesongenetictransformation,thedifferenceamongthreegenotypes(DN04-18,DN04-25andDN04-26)ofPopulus×euramericana(Populusdeltoides×P.nigra)intermsofshootregenerationwasinvestigatedinthispaper.AnefficientinvitromicropropagationmethodwassuccessfullyestablishedforgenotypeDN04-18.Thehighfrequencyshootregeneration(90.0%)fromleafdiscswasobtainedingenotypeDN04-18onthemodifiedMurashigeandSkoog(mMS)mediumw...

简介：研究被进行检验三干燥森林种，Lysilomadivaricatum(Jacq)，Tabebuiaochracea(可汗)和Lonchocarpusminimiflorus的自然新生(Donn。Sm)在尼加拉瓜在一个三年的时期上并且到在到在Chacocente野生动物的光的地志的斜坡和发生的关系中的新生的分析异质保留。永久样品阴谋在2001被建立，并且有象10厘米和象10厘米一样大的直径一样低的高度的所有个人从2001～2003被记录三连续的年。结果证明自然地改革的个人的密度在种类之中显著地变化了，以及随着时间的过去。L。minimiflorus和T。ochracea与L相比有更高的密度。divaricatum，和在种群密度的网变化为T是稍微积极的。ochracea仅仅。新生更充满在到日光的王冠的部分暴露下面的轻轻、陡峭的斜坡，因此导致分发的聚集的模式，特别为L。minimiflorus和T。ochracea。我们断定那个自然新生独自不是足够的维持这些的股票的需要的数字种类，和一项立即的恢复措施应该被拿帮助自然新生过程。

简介：为木质的植物差异，结构和新生上的读经台州的福雷斯特里的这研究，70空铅，每25?在25的m?m，用一种系统的随机的采样技术和100的间隔被选择?沿着一根横断线的m。为估计幼苗和树苗，二2??楷桴？

简介：Exclosureisamethodofrehabilitatingdegradedlandsbyprotectingthemfromtheinterferenceofanimalsandfromhumanencroachment,andisusedtoregeneratenativevegetationasawaytoreducesoilerosion,increaserainwaterinfiltrationandprovidefodderandwoodybiomassindegradedgrazinglands.Therefore,westudiedwoodyplantstructure,diversityandregenerationpotentialsin5-and10-yeargrazingexclosuresincomparisonwithopengrazedsitesinasemi-aridenvironment.Dataonspeciesdiversity,abundance,structure,basalarea,frequency,density,andregenerationstatuswerecollectedfrom270sampleplots.Forty-onewoodyspeciesrepresenting20familieswereidentified,with18,28and38speciesfoundinopengrazedareas,andin5-and10-yeargrazingexclosures,respectively.The10-yeargrazingexclosureshadahigher(P<0.05)speciesrichnessandplantdensitiescomparedtothe5-yeargrazingexclosuresandtheopengrazedareas.ThepopulationstructureandregenerationstatusofwoodyspeciesinbothgrazingexclosuresshowedaninvertedJ-shape,indicatingahealthyregenerationstatus,whereashamperedregenerationwasobservedinopengrazedareas.Theestablishmentofgrazingexclosureshadpositiveeffectsinrestoringwoodyplantdiversityandimprovingvegetationstructureandregenerationpotentialsofdegradedgrazinglands.

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：木质的种类的差异和新生在二生态的壁龛viz被调查。在旧生长的季节联盟者的差距和未经触动的植被弄干Shorea柔韧一(Gaertn。f.)在尼泊尔的森林。我们也联系了差异措施和新生属性的变化到差距特征。树和灌木部件的茎密度比在未经触动的植被在差距是更高的。S的幼苗密度。柔韧andTerminaliaalata(B。Heyne前Roth)比在未经触动的植被在差距是更高的，当矛盾的结果为T被观察时。bellirica(Gaertn。前Roxb)并且Syzigium枯茗i(L。Skeels)以幼苗密度。在幼苗层的Simpson索引，平均索引，和种类个人比率的补充比未经触动的植被在差距是更低的。差距尺寸能解释种类丰富和种类建立率。在不同的年里到多重树下降创造的差距有S的更高的幼苗密度。柔韧a比单个或多重的树创造的差距掉在一样的年里。在结论，差距由增加柳安森林的幼苗密度，和帮助新生维持种类差异。除了差距尺寸，另外的差距属性也影响种类差异和新生。

简介：AprotocolformicropropagationusingnodalexplantsfrommaturePinusmassonianatreeshasbeendeveloped.Timeofexplantcollectioniscrucialfortheinitialsuccessofasepticculture.ExplantscollectedinearlyMarchgavethehighestpercentageofexplantsurvival(64.5%)andshoot-formingpercentage(52.3%).Thidiazuron(TDZ)concentrationsignificantlyinfluencedshootformation;4lMTDZwasoptimum,with4.8shootsproducedperexplantwithameanlengthof7.1cmafter120daysofculture.Regeneratedshootsrootedfor60daysinbasicmediumwith1lMNAAwerereadyforgrowthinpots.ThisisthefirstreportonplantletregenerationinvitrofrommaturetreesofP.massonianathatprovidesareliablemethodforpropagatingselectedelites.

简介：Sincethegenerationoffull-sibartificialtriploidfamilies,rapidcloneestablishmentandgeneticimprovementshavebeenneeded.Here,wereportaninvitromethodofdirectshootregenerationofatriploidhybridpoplar[(Populussimonii9P.nigra‘Italica’)9(P.9‘popularis’)].Usingdifferentrandomizedblockdesigns,weselectedonetriploidtoevaluatetheexplanttype,optimalconcentrationsofplantgrowthregulatorsandagar,andculturetimeunderlightordarkconditionsover60days.Thehighestrateofshootinduction,80.0%,wasobtainedusingMurashigeandSkoog(MS)mediumsupplementedwith0.2mg/Lbenzyladenine,0.04mg/Lnaphthaleneaceticacid(NAA),and5.5g/Lagarforthefirst30daysinthedark,then3g/Lagarforthenext30daysinlight.Thislastmediumyieldedthebestrateofshootinduction(6.32shoots/explant).Thesethreemediawerealsousedtoevaluatetheinfluenceofthegenotypesoftheparentsandhybridtriploidsonregeneration.Twoparentsandthreeofthefourfull-sibtriploidswereregeneratedsuccessfully;differentgenotypesandexplanttypessignificantlyaffectedtherateofshootinductionandaveragenumberofshoots.Leavesbutnotpetioleswereasuitableexplant.Onegenotypeproducedthehighestrateofshootinductionof96.67%.Half-strengthMSmediumsupplementedwith0.2mg/Lindolebutyricacidand0.04mg/LNAAwasthemosteffectiveforrooting;rootingratewas96.67%,survivalrateoftransplantswas73.33%,androotingfrequencysurpassed85%foreachgenotype.Overall,thisinvitroregenerationsystemwillbeusefulforthepropagationandgeneticmodificationoftriploidpoplars.

简介：Naturalspruce-firmixedstandisoneofthemainforesttypesintheworld,andalsohashugeecological,economicandsocialbenefits.Accordingtothestructuralcharacteristicsandsuccessionlawsofnaturalspruce-firforest,itisurgentandsignificanttodevelopscientificmanagementmeasuresfornaturalspruce-firmixedstandinlinewithlocalconditions.Thearticleoutlinedthecharacteristicsofthedistributionandstructure,regenerationandsuccessionlawsofnaturalspruce-firforest,andanalyzedthecurrentsituationandexistingproblemsofnaturalspruce-firforestmanagement.Thefollowingrecommendationswereeventuallymade:1)Innocuttingarea,allloggingactivitiesshouldbebanned.Inarestrictedcuttingarea,thecuttingintensityshouldbegenerallycontrolledwithin15%ofthestockvolumebeforecutting.Onthecommodityforestmanagementarea,theappropriatecuttingintensityshouldbedeterminedaccordingtothevolumeperhectare,determineandclassificationmanagementshouldbeimplementedinaccordancewiththecharacteristicsofforest,toensurethescientificselectivecutting.2)Closureforafforestation,plantingandrepairplantingshouldbeadoptedonvegetation-intensiveland,sparseshrubscoveredlandandharvestingslash,inordertoacceleratenaturalregeneration.3)Theinsituconservationshouldbeconductedinnaturereservesandscientificexperimentstationsofrareandendangeredspecies,suchasAbieschensiensis,Piceaneoveitchii,Abiesvuanbaoshanensis,toreducehumandestruction.4)Itissupposedtocollectseedsintime,establishnursery,activelyestablishforest,expandartificialpopulationandpromotenaturalregeneration.

简介：Populus种类是为工业并且在生物、农业的系统上的科学学习的重要资源。我们的目的是在喜玛拉雅的白杨提高植物新生的频率(Populusciliata墙。前Royle)。TDZ的效果独自并且在有腺嘌和NAA的联合在叶柄将生物的活组织移植于培养基中培养的新生潜力上被学习。将生物的活组织移植于培养基中培养从在温室种的喜玛拉雅的白杨植物被切除。在表面消毒以后，将生物的活组织移植于培养基中培养在射击正式就职媒介上是有教养的。高百分比射击新生(86?%)在与0.004补充的MS媒介上被记录?mgL1TDZ并且79.7?mgL1腺嘌。为延伸和增加的改革射击被转移到MS?+?0.5?mgL1BAP?+?0.2?mgL1IAA?+?0.3?mgL1GA3。从在vitro开发的射击的根新生在与0.10补充的MS媒介上被观察?mg?L1IBA。喜玛拉雅的白杨小植物能在2以内被生产?在在沙和土壤的无菌的混合物的acclimatization以后的月。我们从P的叶柄将生物的活组织移植于培养基中培养开发了一个高效率植物新生协议。ciliata。