简介：Assessmentofregionalforestcarbonstocksandunderlyingcontrolsiscriticalforguidingforestmanagementinthecontextofcarbonsequestration.Weinvestigatedthevariationsintreebiomasscarbonstocksrelatingtoforesttypes,andestimatedthetotaltreebiomasscarbonstocksandprojectedgainsthroughnaturalstanddevelopmentby2020and2050intheDaqingMountainNatureReservebasedonCategoryIIdataoftheForestInventoryofInnerMongoliafortheperiodending2008.Overatotalareaof388,577ha,thisnaturereservecurrentlystoresanestimated2221GgCintreeabovegroundbiomassalone,withpotentialtogrowbymorethan30%toreach2938GgCby2020andnearlydoubleto4092GgCby2050throughnaturaldevelopmentoftheexistingforeststands.Thetreebiomasscarbondensityandpotentialgainintreebiomasscarbonstocksvarymarkedlyamongforesttypesandwithstanddevelopment.Thevariationsinthepotentialchangeoftreebiomasscarbondensityfortheperiods2008–2020and2008–2050amongforesttypespartlyreflectthevaryingrelationshipsoftreebiomasscarbondensitywithstandagefordifferenttreespecies,andpartlyareattributabletovariationsinthestandagestructureamongdifferentforesttypes.Ofthemajorforesttypes,therankingofprojectedchangesintreebiomasscarbondensityarenotconsistentwithvariationsintherelationshipbetweentreebiomasscarbondensityandstandage,neitheraretheyexplainablebyvariationsinstandagestructures,implyingtheinteractiveeffectbetweenforesttypeandstanddynamicsontemporalchangesintreebiomasscarbondensity.Birchrankhighestforfuturebiomasscarbonsequestrationbecauseofitsdominanceincoverareaandbetteragestructureforpotentialgainintreebiomasscarbonstocks.Poplarandlarchwereout-performerscomparedtootherforesttypesgiventheirgreatercontributiontototaltreebiomasscarbonstocksrelativetotheirdistributionalareas.Findingsinthisstudyillustrateth

简介：Artemisiaordosica是为在西北的中国的沙稳定的优秀修理沙的灌木。沙沙丘稳定，一个极其重要的过程，在不能生活的因素的领先变化，例如土壤，结构和营养素满足。然而，A上的因素的效果。ordosica社区追随者沙稳定遗体不清楚。在这研究，我们使用了正规通讯分析(CCA)检验在A之间的关系。在三个产地的ordosica社区和环境因素：修理半的沙丘(SF)，有低范围的生物土壤外壳(F)的固定沙丘，和有在亩的高范围的生物土壤外壳(FC)的固定沙丘我们沙漠。植物的吝啬的高度和范围与沙稳定增加了，当种类差异和丰富开始增加了然后显著地减少了时。关联分析和CCA揭示了那个斜坡，玷污器官的碳，和营养素内容，好土壤粒子的比例，土壤潮湿，和生物土壤外壳的厚度都高度与植被特征被相关。这些环境因素能解释40.42?在三个产地的植被环境关系的%。植物种类的分发是断然与在SF沙丘的土壤潮湿有关。土壤潮湿，土壤营养素，和好粒子的内容主要在F沙丘影响了植物分发。在FC沙丘，植物种类的分发断然并且否定地在深度0-20与生物土壤外壳和土壤潮湿的厚度被相关?厘米分别地。典型大草原种类的优势价值增加了在种类之间的显著地后面的沙沙丘稳定和关系，在CCA分类双性人阴谋的样品证明长期的草能入侵A。FC上的ordosica社区，显示A。ordosica社区有一个趋势与进一步的固定变成典型大草原植被。我们断定重要区别不仅在沙丘固定的三个阶段之中发生在社区特征，而且在在植被和环境因素之间的关系中。那么，降级的沙丘生态系统的恢复应该基于产地条件和生态的需要。

简介：Climatechangehasposedagreatriskandtreatstoglobalenvironment.Toaddresstheproblem,internationalcommunityresortstocarbonemissionreduction,andmanycountrieshaveimplementedafforestationandreforestationprojectunderCleanDevelopmentMechanism.Chinastartedtheresearchandhasdoneagreatloadofworksonforestcarbontradeasearlyastheyearof2002tocontributetothecarbonemissionreduction.ThispaperintroducestheimplementationofforestcarbontradeinHeyuanCity,Guan...

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：Chinaisgloballyacknowledgedas'KingdomofBamboo',andZhejiangProvinceisnationallyrecognizedasthefirstprovinceofbambooinChina.SystematicandoverallanalysisismadebytheapproachofcasestudyonwhyZhejiangcangetsuchamarvelousachievementsoastoprovidesignificantreferencesandinstructionsforbamboodevelopmentforothercountrieswhodesiretolearntechnologiesandknow-howfromChina.Themaincontributionsareconcludedasbelow:1)Quickprogressofbambootechnologyprovidesastrongback-upforbambooindustrydevelopment;2)Governmentalsupportspromotethebalanceddevelopmentofbambooindustry,includingfavorablepolicy,financialsupport;3)Goodrelationofbamboocultivationandprocessing;4)Specialsoci-economicandhumanitarianadvantagesforbamboodevelopment,includinggoodexportenvironment,dynamicprivateeconomy,bambooindustryzone,excellenttalentsofbamboo;and5)Quickexpansionofinternationalanddomesticbamboomarketstimulatesanddrivesthedevelopmentofbambooindustry

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简介：Restorationofmountainslopeforestsisoftenusedtoachieveoneoracombinationofthefollowingaims,includingincreasedproduction,soilprotectionandwildlifeconservation.Inthispaper,biodiversity-orientedsilviculturewasproposedasadesignprincipleinforestrestorationfromwhichstripcuttingofshrubswasusedastherestoringtechnologyofforests.MorethanlO-year-observationsandexperimentalresultsoftheafforestationpracticesintheupperreachesofMinjiangRiver,Sichuan,China,indicatedthatthetechnologywasfeasibleandhadmanyadvantages.Strip-cuttingofshrubsamelioratedmicroclimateconditions,improvedsoilnutriemlevelforthegrowthoftargettreespeciesandincreasedthephysicalsurvivalofpinespecies.Structuraldiversity,intermsofspecies,didnotincrease,butashrubspecieswasobservedtodifferentiatefromshrublayerandtendedtoformmixedforests.Preservebeltsofthetechnologyweresupposedtomeetpublicdemandsincludingbiodiversityconservationandsoilprotection,andactasabasicstageinecologicallyprogressivesuccession.ThepromisinginitialresultsindicatethatstripcuttingofshrubsmaybeaneffectivepracticeforforestrestorationintheupperreachesofMinjiangRiver,Sichuan,China.

简介：Treegrowthtraits(treeheight,DBHandstemvolume)andsurvivalfromtwo9-year-old,open-pollinatedprogenytestsofChinesefirwereinvestigatedforheritability,genotype9environmentinteraction,age-agegeneticcorrelationandselectionefficiency.The97and79familiesplantedattwositeswerecollectedfromthethirdcycleseedorchard.Individualheritabilitywasestimatedbetween0.05and0.21fortreeheight,DBH,andvolumeandbetween0.45and1.0forsurvival.Fa

简介：HuoshanChina-NetherlandsPovertyAlleviationProjectisanintegratedpovertyreliefprojectassistingHuoshanCountyofAnhuiProvincebyNetherlandsgovernment.Itwasstartedin1998withadurationof5years.Thewholeprojectwillpersistinabasicthoughtofpatticipatorythinking,s...

简介：TheratesofsoilNmineralizationatsoildepthsof0-15,15-30,30-45and45-0cmandmoistureregimesweremeasuredatthreesand-fixationplantationsofPinussylve.strisvar.mongolicabylaboratoryaerobicincubationmethod.TheresultsshowedthataverageratesofsoilnetN-mineralizationacrosssoildepthvariedfrom1.06to7.52mg~kg1.monthqatsoildepthsfrom0to60cm.Statisticalanalysesindicatedthattheeffectsofdifferentsoildepths,moisturesandtheirinteractionsonnetN-mineralizationratesweresignificant(P<0.05).ThenetN-mineralizationratessignificantlydecreasedwithincreasingsoildepthsandatdepth0-15cmaccountedfor60.52%ofthatatdepthof0-50cm.TherewasnodifferenceinsoilnetN-mineralizationratesbetweenhalfandfully-saturatedwatertreatments,howevertheseratesweresubstantiallyhigherthanthatwithoutwatertreatment(P<0.05).ThefactorsinfluencingNmineralizationprocesshavetobestudiedfurtherinthesesemiaridpineecosystems.