简介：Bothmorphologicalcharactersandaportionofof28SrDNAsequenceswereusedtoidentifyingTomicusspecies.Thespecimenswereclassedintogroupswiththefollowingcharacters:1)granulesorpuncturesoninterstria2onthedeclivityoftheelytra;2)lengthoftheelytralinterstrialhairsandhairsarisingfrompunctures;3)arrangementofpronotalpuncturesandhairs.Thesecharacterscouldbeclearlyexaminedunderabinocularmicroscopeat30×magnificationandtheywereapplicableandvaluablefortheforestentomologiststoidentifyTomicusspecies.Thephylogenetictreeestablishedwithdifferencein28SrDNAsequenceofD2regionrevealedthatthespecimensofeachgroupidentifiedbymorphologicalcharacterswerealsogroupedtogether.Thegeneticdistancesofintra-species,inter-speciesandinter-genuswerenotoverlapped.Geneticdivergenceof28SrDNAwasalsousefulforidentifyingTomicusspecies.

简介：Nativetreesplayimportantrolesinurbanforestry,suchasadeepculturalbackground,astrongecologicaladaptability,ahighperformance-costratioandaconvenientmanagement.Butnowtherearesomedifficultiesinnativetrees'utilizationandpopularizationduetofewstudyonlandscapeplant.Inordertoseekanabnormalandartificiallandscapingandtoproduceaneffectiveresultassoonaspossible,nativeandforeignplantscanbeproperlyusedasanavailableresourcebyimprovingtheirtechnologicallevelandemphasizingnaturalbalance.ThenChineseclassiccultureandgreeneconomicscanbecombinedwithbeautifulforestrybyimplementingurbansustainabledevelopment.

简介：Inordertoexplorethefeasibilityofcryopreservationondormantforesttreeseeds,theseedviabilityof4species(Malusbaccata,Prunusdavidiana,P.armenicaandAmygdalupersica)withmoisturecontent(MC)changingwastestedafter30-daystorageinliquidnitrogenof-196℃.Theresultsshowedthatallthe4speciesofseedscankeepastableviabilityaftercryopreservation.Intheprocedure,theoptimumMCwas48g/kgforM.baccata,27g/kgforP.davidiana,31g/kgforP.armenicaand45g/kgforA.persica,...

简介：UrbanforestryisnowincreasinglypracticedinThailand.Thishasgainedimpetusbecauseofgradualdeteriorationofvisualamenityandenvironmentalqualityinmanyoftherapidlydevelopingurbancenters.Variousurbanbeautificationprogramsarebeingimplementedtorehabilitateblightedlandscape,pollutedatmosphereanddeterioratingweatherconditions,aswellastomaintainaclean,healthyandpleasantenvironmentsoastoensureabetterqualityoflife.Plantingofsuitabletreesforshade,climaticameliorationandaestheticvaluesformtheprincipalactivityunderthesebeautificationprograms.Itisregardedasnotonlyanimportantcomponentofsocio-economicdevelopmentbutalsocontributivetotherestorationoftheurbanecosystem.TheresponsibilityoftheimplementationofmostoftheseprogramsfallstotheBangkokMetropolitan,Administration,ProvincialandDistrictMunicipalities.TheRoyalForestDepartmentplaysthesupportingroleofsupplyingseedlingsofthespeciesrequiredforplantingandprovidingtechnicaladviceonthegrowingofthesetrees.InthispapertreespeciescommonlyplantedinurbanandpopulatedareasinThailandareidentified.ItisenvisagedthatwiththevastamountoffloraavailableinThailandandthroughtheintegratedeffortsofallagenciesinvolved,thisprogramwillachievethetargetofbeautifyingthecitiesandtownsofThailand.

简介：FurnitureofHongmu,creamofChineseculture,hasalonghistoryandenjoysgreatpopularityforitsclassicappearanceandelegantdisposition.Thetraditionalmethodoftheidentificationistoevaluatethemacroformandanatomicalfeatures.Inthispaper,anewmethodbasedonthedifferencesamongthechemicalcharacteristicsofbiologicalmetabolitesofsamplesisdeveloped.Intheresearch,highperformanceliquidchromatography(HPLC)fingerprintswereemployedtodiscriminatefourspeciesofHongmu,includingPterocarpusindicus,Pterocarpusmacarocarpus,Dalbergiamelanoxylon,andDalbergialouvelii.Theresultsshowedthat,accordingtotheretentiontimeandrelativepeakareaofdifferentcomponentsinwoodextracts,thedistinctioncanbeeasilymadebetweendifferentspecies.BasedontheHPLCfingerprints,similaritiesbetweensampleswereevaluatedbycorrelationcoefficients.Theresultsweregreaterthan0.81betweenthesamespecies,andlessthan0.21betweendifferentspecies,whichshowedweakcorrelationbetweendifferentspecies.Inordertoestimatetheoverallfeaturesofthefingerprints,hierarchicalclusteringandprincipalcomponentanalysis(PCA)wereusedandtheresultsshowedpronouncedclusteringeffectamongthesamespecies.TheinvestigationindicatedthatpatternrecognitioncouldaccuratelyreflectthesignificantdifferencesbetweendifferentspeciesofHongmu,andcanbeusedasareferenceforqualitycontrol.

简介：Fromaworld-wideplantintroductiontrialseriesutilising25centralAmericanspeciesplantedatover100sitesinnearly60countries,eighteenspeciesplantedat15sitesinthetropicswerechosenforfurtherstudyofthefactorsdeterminingsiteproductivityandsitebyspeciesinteractions.ThespecieswereAcaciapennatula,Acaciafarnesiana,Albiziaguachapele,Ateleiaherbert-smithii,Caesalpiniacoriaria,Caesalpiniaeriostachys,Caesalpiniavelutina,Enterolobiumcyclocarpum,Gliricidiasepi...

简介：ChemicalanalyseswereconductedwithleaveoilsofEucalyptussmithii,E.bakeri,E.polybractea,E.dives,E.radiataandE.macarthuriivvhichwereintroducedtosouthwesternChinafromAustralia.ItwasfoundthattheleafoilsofE.smithii,E.bakeriandE.polybracteacontained81-90%of1,8-cineole,andE.divesandE.radiatacontainedhighera-phelandreneandpiperitone.Therevveresignificantinter-andintraspeciflcvariationsinleafoilyield,italsovariedwithseasonsinvvhichleaves...

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简介：Forestmanagementinseveralborealcountriesisstronglyfocusedonconifersbecausetheyaremoreproductive,thetechnicalqualityoftheirstemsisbetter,andtheirwoodfibersarelongerascomparedtobroadleaves.Favoringconifersinforestmanagementleadstosimpleforeststructureswithlowresilienceanddiversity.Suchforestsareriskyinthefaceofclimatechangeandfluctuatingtimberprices.ClimatechangeincreasesthevitalityofmanyforestpestsandpathogenssuchasHeterobasidionspp.andIpstypographusL.whichattackmainlyspruce.Winddamagesarealsoincreasingbecauseofashorterperiodoffrozensoiltoprovideafirmanchorageagainststorms.Wind-throwntreesserveasstartingpointsforbarkbeetleoutbreaks.Increasingtheproportionofbroadleavedspeciesmightalleviatesomeoftheseproblems.Thisstudypredictsthelong-term(150years)consequencesofcurrentconifer-orientedforestmanagementintwoforestareas,andcomparedthismanagementwithsilviculturalstrategiesthatpromotemixedforestsandbroadleavedspecies.Theresultsshowthat,intheabsenceofdamages,conifer-orientedforestrywouldleadto5-10%highertimberyieldsandcarbonsequestration.Thesomewhatlowercarbonsequestrationofbroadleavedforestswascounteractedbytheirhigheralbedo(reflectance).Mixedandbroadleafforestswerebetterprovidersofrecreationalamenities.Speciesdiversitywasmuchhigherinmixedstandandbroadleaf-orientedsilvicultureatstandandforestlevels.Theanalysisindicatesthatconifer-orientedforestmanagementproducesrathersmallanduncertaineconomicbenefitsatahighcostinresilienceanddiversity.

简介：Thegrowthandmorphologicalcharacteristicsof25speciesofpoplarwereinvestigated.ThecuttingswerecultivatedinHoaglandNutrientSolution,whichwasmadewithsodiumchloride(NaCl)solutionsofconcentrationof1.00,3.00,4.00,5.00,6.00,and8.00g/L,respectively.Undersuchsaltstress,thenewbranchlengthandbiomassaccumulationofcuttingsdecreasedasthesaltconcentrationincreased.Theroot/shootratioofmostofspeciesshowedanescalationandthenreductiontendency.Underlowcon...

简介：节Strobus的12种类的基因关系与ISSRmarkers被分析。117loci与12份ISSR教材被检测。多态的乐队(PPB)的百分比从5.93%～19.92%变化了。P。pumila有基因区别和P的高水平。flexilishad最低。在节Strobus的12种类的全部的基因差异(H_T)是26.21%，基因差异(H_S)是的whichintraspecific7.66%，并且种间的基因差异(D_(圣))was18.55%，和遗传变异在内部种类说明了70.78%全部的基因差异。根据遗传距离的簇结果，12种类被分类进二个组。第一个组包括了P。griffithii，P。armandi，P。fenzeliana，P。kwangtungensis，P。strobus，P。monticola和P。wangii。第二个组包括了P。albicaulis，P。pumila，P.flexilis，P。sibirica和P。koraiensis。

简介：INTRODUCTIONTheinsolublephosphateswhichcannotbedirectlyabsorbedbyplantsarethemaiformsofinorganicphosphateinsoil.Thesekindsofphosphatescanbesolubilizedbyseveralspeciesofbacteriawhicharewidelyspreadinsoilespeciallyinrhizospherewhere70%ofthebacteriaarecapableofsolubilizinginorganicphosphate.Manyresearchersre-

简介：Firedisasteristheprimaryoneofthefactsofdeforestation.Althoughinrecentyearsthelevelofforestmanagementandtechniqueforfiresuppressionhavebeenimprovingandfirefightingforcehasbeenstrengthened,theareaoffirehasnotbeendecreasedobviously.Usingbiologicalfireresistanttechniquecaneffectivelypreventthecampaignfire.Inthispaper,fireresistantabilityandcomponentabout12treespecies,inmountainareaofDaguishan,GuangxiZhuangAutonomousRegion,havebeen...

简介：这篇论文报导二最新记录的种，IsohypsibiuslunulatusIharos，1966；IsohypsibiusprosostomusThulin，1928，类Isohypsibius(Tardigrada；Hypsibiidae)从中国。Isohysibiuslunulatus的标本从Taibai山被收集(34°18′N，107°42′E)在2,500ma.s.l；那些从Taibai山的Isohypsibiusprosostomus(34°10′N，107°35′E)在上面的2,000m，海铺平。所有标本在生命科学的学院被扔，Shaanxi师范大学，中国。Isohypsibius的中国种类的关键也被给。

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简介：Leafshapesarenotonlytheusefulindicatorsinplanttaxonomy,butalsotheimportantfactorsaffectingenergyandmaterialexchangeinleaves.Inthispaper,wecollectedandscannedtheleavesofNitrariatangutoruminDengkouofInnerMongoliaAutonomousRegion（themeanannualprecipitation145mm）andMinqinofGansuProvince（themeanannualprecipitation115mm）andN.sphaerocarpainDunhuang,andthenanalyzedleafshapeparameterswithImage-ProPlus6.0imageprocessingsoftwareandleafδ13CvaluesintheisotopelaboratoryoftheChineseAcademyofForestry.Theresultshowedthat:1)asleafareaincreasedwithincreasingwateravailabilitytheincreasesintheleaflengthandwidthwereasynchronously;2)withthesameleafwidth,the1eavesofN.tangutorumandN.sphaerocarpaweresignificantlylongerinhighwateravailableconditions;and3)althoughthereweresignificantlydifferencesinwateravailabilitybetweenDengkouandMinqin,aswellasbetweenthebottomandmiddleofthealluvialfanneartheEastLakeinDunhuang,theleafδ13CvaluesofN.tangutorumorN.sphaerocarpaweresimilarindifferentwaterconditions（P>0.05）.Ourresultssuggestedthattheratioofleafperimetertoareawouldbeanimportantfactorwhichlinkedleafshapetoplantwaterphysiology.Duringgrowingprocedureofleafarea,leaflengthincreasewaspriortoitswidthtoalleviatethereductioninratioofperimetertoareaandmaintainwateruseefficiencyoftheplant.

简介：到沿着Changbai山的北斜坡的1900m的从700m的社区的种类分发频率被在1999的夏天使用Raunkiaer的频率分析方法学习。有举起的增加的社区的作文和结构上的变化从频率的观点被显示。尽管在社区之中有差别，结果证明为包括树，灌木和植物的社区的所有种类，频率介绍了鈥淟鈥?形状。高频率种类的百分比随举起的增加增加了。作为在反映种类的重要索引之一空间模式，频率在种类的重要性上面的不仅表演，而且在社区的空间分发的平均。频率数字能在某程度揭示社区的复杂性和差异。

简介：Remotesensingimagesshowaverypromisingperspectivefordistinguishingtreespecies,especiallythosewiththeveryhighresolutionrangingfrom1to4m.However,thetraditionalmethodologyforclassifyinglandcovertypes,solelydependingonspectralfeatures,whiletextureandotherspatialinformationareneglected,hastheweaknesssuchasinadequatelyutilizationofinformation,lowaccuraciesofclassification,etc.Consideringtothetexturedifferencesamongforestspecies,itismoreimportantforspatialinformationdescriptionofhigh-resolutionremotesensingimagetoimprovetheprecisionoftexturalfeatureschoosing.Inthisstudy,thefactorstoinfluencetheninetexturalfeatureschoosingwereanalyzedandtheresultsshowedthatthemovingwindowsizewasthemainfactortoaffecttheobtainingprocessesoftexturalfeaturesbasedonthegraylevelco-occurrencematrix(GLCM)method,andtheimagerywasthenclassifiedcombiningthemaximumlikelihoodclassification(MLC)methodwiththeoriginalspectralvaluesandtexturefeatures.First,thisstudyutilizedacorrelationanalysisoftheimagesfromaprincipalcomponentanalysis.Second,throughmultipleinformationsources,includingtextualfeaturesderivedfromthedata.Forthehigh-resolutionremotesensingimage,themostpropermovingwindowsizewasdeterminedfrom3×3to31×31.Classificationofthemajortreespeciesthroughoutthestudyarea(theSunYat-SenMausoleuminNanjing)wasundertakenusingtheMLC.Third,toaidforestresearch,classificationaccuracywasimprovedusingtheGLCM.Accordingtocorrelationsamongtexturesandrichnessofthedata,GLCMprovidedthebestwindowsizeandtexturalparameters.Resultsindicatedthatthetexturecharacteristicswereaddinthespectralcharacteristicstoimprovetheprecisionoftheresultsoftheclassification,19×19windowforbestwindow.Thetotalprecisioncanreach66.3226%,Kappacoefficientis0.5840.Eachtreespecieshasgreatlyimprovedaccuraciesoftheclassification.Bythecal

简介：AseminiisaNorthernHemispherecerambycidtribe,andanimportantforestpest,mainlycausingdamagetoconiferousplants.Moreimportant,asonekindofquarantineinsects,Aseminicanbringaboutmanytroublesintimbertrade,therefore,thealienspeciesshouldbepaidmoreattentionsandneedtobequarantinedinordertopreventthemtobeintroducedtoChina.InChina,thereare4genus26speciesofAsemini.HostplantsofAseminiinclude15genus36speciesof7families,andthemainhostplantsareinPinus,accountingfor30.56%ofthetotal.Afaunaanalysisindicatedthat15speciesofAseminidistributedinthePalarearticRealm,accountingfor57.69%ofthetotal.ThespeciespredominatedinChina,probablybecausegymnospermswerethemainvegetabletypeinthisregion.ThispaperlistsalltheknownspeciesandgeneraofAseminiandtheirhostplantsinChina,anddiscussestheirdistribution.Theaimistoarousetheconcernsoftheseinsectsandprovideareferencefortherelevantwork.