简介:Bydrawingonstudiesofdomesticandinternationalforestlandscapeassessmentandvisualevaluationofurbansoundscape,wesummarizedthemainfactorsaffectingtheforestsoundscape.Onthisbasis,weestablishedanevaluationsystemforlevel2class3forestsoundscape.Elevenindicatorsoftheforestsoundlandscapeaestheticevaluationsystemandtheweightoftheproductwerescored,andthentheaccumulatedscoredvaluesweredefinedasthesoundlandscapeaestheticindex.Theacousticlandscapeindexwasusedtomeasurethesizeoftheforestlandscapebeautifuldegree.
简介:Thisarticlegraspstheimplicationofecologybasedonthetheoryofgreenway,WiththepurposeofmakingZhejiangProvincebecomeanecologicalprovince,itpointsoutthattheproblemsexistinthegreenwayconstructionandmakesitclearthatthegreenwayconstructionisveryimportant.Furthermore,incombinationwiththelineargreenopenspaces,suchasgreeningpassages,touristareas,andadministrationfacilitiesinZhejiangProvince,thisarticleputsforwardthestrategicideasofthegreenwaysconstructionandthestrategies,measurestoapplythegreenwaysconstruction.
简介:EstablishedbytheformerMinistryofForestryin1986,DagangshanForestEcosystemResearchStationisoneofthe14nationalkeysitesinthefieldofecosystemresearch.Inthispaper,thebasicsituationofDagangshanForestEcosystemStationisdescribed,includinggeographiclocation,naturalconditions,biologicalresources,researchconditions,instruments,achievement,prospectsetc.
简介:Forestgeneticmapsareanimportantcomponentwithintheforestbiologist’stoolkit,underpinningforestimprovementprograms.Theestimationofforestgeneticmapsisaconceptuallysimpleyetcomputationallycomplexproblem,duetolonggrowthperiodandhighheterozygosisandgeneticloadofforesttrees.Atpresent,somegeneticmapsoftreeshavebeenconstructed.Thispaperreviewedtheprocessofforestgeneticmapconstruction,highlightingitsuniqueness,andpointedouttheproblemsthatmightriseinmapping.Finally,prospectwasmadeforconstructingthehighdensitygeneticmapoftrees.
简介:Urbanforestisanimportantcompositionandthewindowandsoulofmoderncities,whichhasacloserelationshipwithecologicalenvironmentandinvestingenvironment.SourbanforesthasbeenconstructedinChina.HuainingCountycouldholdofthehistoricalopportunityandcomeupwiththegreatblueprintofforestecologicalnetworksystemconstructionforthenewtown.Thispapermainlyintroducestheguidingideas,principles,goalsandoveralllayoutsoftheconstructioninthenewtown,andhopethatitwillbeamodelforothercounty-levelforestecologicalnetworksystemconstructioninChina.
简介:FemaleinflorescenceofBetulaplatyphyllawassampledatanintervalofeachtwodaystoanalyzethebackgroundofgeneexpressioninfloralphase.OnthebasisofSMARTstrategy,thedrivercDNAwasobtainedfromtotalRNAofthelastsampleandthetestercDNAwasfromthatoftheothersbyRT-PCRwhichweresubsequentlyusedtoconstructasubtractedcDNAlibrary.TheresultoftheESTs(expressionsequencetags)blastXshowedthatthegenesinthesubtractedcDNAlibrarycouldbemainlyclusteredinto5groupsrelatedtometabolism,transportationandsignaltransduction,cellcycle,stressresponse,andregulation.Therelationshipbetweengeneexpressionanddevelopmentwasalsodiscussed.
简介:Amodelstandofnear-naturalforestwithanareaof3000m^2wasestablishedasacasestudyinPudongNewDistrict,ShanghaiCityin2000.Elevenspecieswereplantedinmodelstand.Asthedominantspeciesofcommunity,4evergreenbroad-leavedtreespecies,namely:Machilusthunbergii,Cyclobalanopsisglauca,C.mylsinafoliaandCastanopsissclerophyllawerechosen,accompanyingwithevergreenbroadleavedshrubspecieslikePittosporumtobira,LigustrumquihouiandDis~'liumracemosum,etc.aswellasdeciduoustreespecies,Liquidambarformosana,etc.Afterthree-yeargrowth,thecommunityphysiognomyhadchangedtobeashrubstage,andthehighesttreereachedto4.6m.Aforestphysiognomywouldbeformedinabout10yearsestimated.Themethodofconstructionofnear-naturalforestthathadbeenworldwidelyappliedwouldalsoplayakeyroleintheconstructionofurbanforestinChina.
简介:为杂草的成功理解原因,我们调查了叶建设,和米饭和它的主导的杂草的某些ecophysiological特点的精力充沛的费用。在在所有杂草之中的生理的基础上,CaesuliaaxillarisRoxburgh被发现最严肃,由Echinochloacruss-galliL列在后面。Beauv和EchinochloacolonumL。连接,当时FimbristylismiliaceaeL。Vahl和CyperusiriaL。是稻田的中等杂草。C。axillaris在一个集体基础(1.15g/g)上并且在一个联合起来的区域基础(22.93g/m2)上有最低的叶构造费用(LCC)。比较地更高的特定的叶区域,光合的率,光合的氮使用效率,叶区域比率和叶区域索引提供的C。有进一步的竞争优势的axillaris。低LCC建议杂草比庄稼更高效地利用碳资源并且潜在地在另外的竞争策略viz上花节省的精力。种子生产,生物资源生产和高相对的生长评价,它导致在杂草种子银行的低庄稼产量和增加。
简介:Forthehighbiomassandadaptability,applicationofwillowoncultivatingbioenergyforestandphytoremediationhadbeengottenmorerecognitionintheworldwide.Integratedwithourresearchpractice,weintroducedthegermplasmofhighbiomasswillowinChina,andthenewvarietieswithhighbiomassandtheircultivatedtechniquesweresummarizedinthisarticle.Moreover,wereportedthedevelopmentuptodateinbreedingandcultivationonwell-bredwillowwithhighbiomassandanalyzedtheforegroundofestablishingindustrialwillowwithhighbiomassinChina.
简介:对土地资源及其综合生产潜力的评价,在于阐明特定时空土地资源的性质、特点、生产潜力和利用价值的水平,为合理利用土地、充分挖掘生产潜力提供科学依据;对于地形起伏大、生态环境脆弱、土地类型丰富,但总体质量偏低的北京石质山区的进一步治理、规划和建设来说,显得尤为重要,亦有着鲜明的实际意义.该文在分析土地评价概念的基础上,界定了土地综合生产潜力的内涵,利用模糊数学、统计学、系统分析等手段,采用定性和定量分析相结合的方法,结合北京石质山区特定时空上土地单元的自然及社会属性,对土地综合生产潜力评价指标选取的基本条件、构建指标体系的基本原则和方法等加以探讨,提出了土地综合生产潜力评价模型,并应用于密云水库上游黄峪口小流域,得到理想效果.