简介:ThispaperexamedtheCupressaceaetaxainChina.Itisidentifledthat30speciesand16varietiesin7generainthefamilyareindigenous,andestimatedthatabout25speciesand4varietieshavebeenintroducedintothiscountrysincethebeginningofthiscentury.Itisurgentthatmorefurthurstudiesneedtobecarriedoutinthecountryonthetaxonomyespeciallyofjunipersandcypresses,onthere-classificationofexistingcultivars,andonthedevelopmentofnewcultivarsforfutureneeds.
简介:Humanactivitiesmakestrongeffectsonsoilformation.AnthropogenicsoilsaremuchmoreintensiveandextensiveinChinafortheirhistoryofagriculturalproductioncanbedatedbacktomorethan7000yearsagoOwingtodifferentphysicalconditionsandlanduses,theanthropogenicsoil-formingprocessesarevariousAnthrosolsareproposed,andthecorrespondingsoilorderissetupinChineseSoilTaxonomy(CST),Mainlybasedon6Anthropogenicdiagnostichorizons,whichareanthraquicepipedon,hydragrichorizon,irragricepipedon,cumulicepipedon,fimicepipedonandagrichorzon,theAnthrosolsOrderissubividedinto2soilsubordersand4soilgroups.MeanwhiletheclassificationofAnthrosolsinCSThasbeenbasicallyacceptedastheclassificationofAnthrosolsinWorldReferenceBaseforSoilResources(WRB).
简介:Paulowniaisafast-growingtreespeciesthatismainlyfoundinthecentralpartofChina.ThreemaincultivationareasofPaulowniaaretheYellow-Huai-HaiPlain,southoftheYangtzeRiver,andaridandsemi-aridareasofNorthwesternChina.Thereare9species,4varietiesand4formsusedintheproductioninChina.Studyachievementswereobtainedinthefieldsofspecies/varietyintroduction,selectionandbreeding,afforestationtechniquesaswellasthecontrolofdiseasesandpests.Themainproblemsexistinginthecurrentproductionincludelackofimprovedvarieties,mix-upofdifferentvarietiesandvarietydegenerationduetothelongcourseofasexualreproduction.Theauthorputforwardcountermeasuresfortheproblems.
简介:Poroidspeciesofwood-inhabitingfungigrowingonspruce(PiceakoraiensisNakaiorPiceayezoensis(Sieb.&Zucc.)Carriere)inNortheastChinawereinvestigatedduring1993-2002,and71specieswererecordedfromthesetreesortheirwood.SkeletocutislilacinaA.David&JeanKellerandSkeletocutispapyraceaA.DavidarenewtoChina.Fomitopsispinicola(Sw.:Fr.)P.Karst.,Onnialeporina(Fr.)H.Jahn,Perenniporiasubacida(Peck)Donk,Phaeolussckweinitzii(Fr.:Fr.)Pat.,Phellinidiumsulphuras...
简介:Withavastterritory,Chinaisrichinforestresourcesanddiversifiedenvironments.Thechangesinforestresourceshaveadirectbearingonenvironmentalquality.ThepapergivesadetailedaccountofthedynamicchangeinforestresourcesinChina,includingtheoverallprocessofforestevolution,thestatusquoandfeaturesoftheexistingforestresourcesandthedevelopmentanduseofmajorforestresources.Inaddition,itanalysesthecurrentsituationofChina'senvironmentandexploresthemaincontn'butingfactorsbasedontheoverallenvironmentalsituation.InordertoachievesustainablemanagementofforestresourcesandimprovetheenvironmentinChina,theChinesegovernmentattachesgreatimportancetotheprotectionanddevelopmentofforestresourcesaswellasenvironmentaldevelopmentandimprovement.Thepapergivesanoverviewofthethinkingforsustainableforestresourceandenvironmentaldevelopmentinthefutureandcurrentfocusofefforts.
简介:ThefuelbreakswereestablishedinsouthChinafrom1950s.Withtheactiveworkoflocalcommunitiesandstategovernment,thefuelbreakshavebeenbuiltfor398,000kilometers.Insomeareas,fuelbreaksandfirebreakshaveconstructedanetworkprimarily,suchasintheprovincesofFujian,Guangdong,Guangxi.Thefuelbreakscanpreventforestfireeffectively.Thathasbeenapprovedbyactualexamplesandburningtests.Thefuelbreaksalsobenefittheforestecosystemandenvironment.Thispapermakes...
简介:ByreferenceoftheevaluativedataofforestbiodiversitychangesinChinafrom1973to1998,thevariationanalysismodelsofthepressureindexofforestbiodiversity,forestecosystemdiversityandforestspeciesdiversity,aswellasthegeneralindexofforestbiodiversityaredevelopedusingStatisticalPackagefortheSocialSciences(SPSS).Furthermoreestablishedistherelevantmodelofmutationofforestdiversitypotentialfunctions.Thispaperpointsoutthatchangesofforestbiodiversity...
简介:ApplicationofPRRAtotheRuralDevelopmetinChinaTXApplicationofPRRAtotheRuralDevelopmentinChinaByShenYueqinZhouGuomoYuShuquanLiMin...
简介:Chinaisnotrichinnaturalforestsources.Owingtonaturalandhistoricalfactors,forestfireshavelongbeenfrequentingChina.Forestfirepreventionisthemostimportantofall.Forestfirepreventionandcontrollinghavelongbeenheldasaveryimportantfactorinourecologicalplans.Takingchina'sspecialgeographicallocation,topography,climateandthedistributionofforestsourcesintoconsideration,wehaveeveryreasontobelievethatforestfiresinChinahavetheirownspecialenv...
简介:统计生态学与分析技术和方法的前进很快发展。这份报纸在后面的方面在中国关于统计生态学做了评论:数据收集,空间并且时间模式分析,种类丰富和种类区域关系,人口动态,种类亲密关系,社区类似和社区簇分析,和社区分类。
简介:“LOCALREGULATIONS”ANDSOCIALFORESTRYINCHINA¥ByHePikunDuringthelongperiodofsocialforestryproductionandVillagersparticipateinthe...
简介:伍德composites能通常在三部分被分类:把压成薄片的composites,混合composites和渗透的composites。每部分有它的自己的特征和罐头进一步被划分。这篇论文在中国介绍历史和木头composites的开发的国家。关于把胶水压成薄片的木材的研究是稀罕的,工业几乎不来到是。成就的一个伟人在混合composites被获得了,它是很好工业化的。scrimber上的许多研究被做了,中国研究人员正在寻找在中国开发scrimber工业的一个可行方法。中国研究人员也在学习木头塑料composites(世界和平理事会)花了那么多精力,但是它一直不由于高费用是工业化的。
简介:CHINAAERIALSEEDINGACHIEVEMENTANDDEVELOPMENT¥ByLiNuyunandZhangJingchunCurrently,aerialseedingisoneofthemostthismethodisquick,e...
简介:Urbanforestry,whichroseinthewestinthelatterhalfofthe20thcentury,isatypeofforestryservingforcity.Itsimportantcharacteristicisthatitmakesthroughitsnarrowsense,or"urbanafforestation",whoseobjectiveistomakecitygreenandbeautiful,anddevelopsintoaforestrysystemservingfortheurbansystem.Theconsequenceofrapidmoderncivilizationisthatskyscrapersconcentrateinurbandistrictandgreenspacebecomenarrower,resultingthatgreen