简介：ThepresentsituationofforesttreegeneticgermplasmresourcesresearchandconservationinChinaisintroducedwhichincludingthebackground,decision-makingofconservationstrategiesandprinciples,theplanofareadivisionandtreespeciesclassification,thesamplestrategyofgermplasmconservation,theadvancesinconservationpatternandrelatedtechnologiesresearch,theachievementsofgermplasmconservationandutilizationinChina,andtheproblemstobesolved.Therecentachievementsa...

简介：Byadoptingtheevaluationindexsystemofconservationprioritywhichincludedthreatenedcoefficient,geneticcoefficient,utilizationcoefficient,protectionstatuscoefficientandliststatuscoefficient,theendangeredplantsinNortheastChinawerequantitativelyanalyzedandsyntheticallyevaluated,andthevalueofconservationpriorityandconservationprioritygradesoftheendangeredplantsweredetermined.Theresultsshowedthattherewere60speciesofendangeredplantsbelongingto42generaand25familiesinNortheastChina,thevalueofconservationpriorityrangedfrom0.8538-0.3184.Theendangeredplantsweredividedinto3gradesaccordingtotheirvaluesofconservationpriority,17speciesbelongingto15generaand11familieswereinthefirstgradeprotection,18speciesbelongingto14generaand11familieswereinthesecondgradeprotection,25speciesbelongingto17generaand13familieswereinthethirdgradeprotection.Thequantitativelyevaluationindexsystemofconservationpriorityinthispaperrepresentedthedegreeofconservationpriorityoftheendangeredplantscomprehensively,objectivelyandaccurately.

简介：AccordingtotheunificationprincipleofsystemstructureandsystemfunctionoftheWaterResourceConservationForests,sevenfactorswereselectedfromstandspatialstructure,treesstructureandhealthyofwoods,themultifunctionmanagementoptimizationmodeltargetwasconfirmedbyusingnonlinearitymulti-objectiveprogrammingapproach,andthetargetfunction-standspatialstructurehomogeneityindexwasdefinedtoestablishspatialoptimizationmodelswithrestrainingconditionssetupindiversityofstandstructureandspatialstructure.ThespatialstructureofavailabletypicalstandinthewetlandareainsouthernDontingLakewasoptimizedbymeansofselectivecuttingandreinforcementplanting.Theresultsshowedthatthespatialstructurewasimprovedobviouslyandtreesdiversityandstandhealthwerenotweakened.It’ssuggestedthattheestablishedoptimizationmodelcaneffectivelyguidemultifunctionmanagement,standstructureoptimizationandthesteadinessofecologicalecosystemanditisconvenientandoperableinpractice,andit’sveryimportanttoprotectandrecoverecosystemofWaterResourceConservationForests.

简介：SongRong(i.e.Matsutake,Tricholomamatsutake)isthemostfavoriteediblemushroominJapanandrestrictedlydistributesinforestsinEastAsia.TheyieldofSongRong,however,hasbeenextremelydroppingsince1940'sintheregionduetochangesofenvironmentalecologyofnatureforests.Asacompensationforconsumption,JapanimportedproductsofT.matsutakefromKoreaandChina,andT.magnivelarefromNorthAmericasincemid-1970s,butT.matsutakestiliaccountsforalargeportionofthe...

简介：分析了中国东北小兴安岭林区红松种群的生活史过程及其影响因素，对红松生活史的４个阶段进行了分析，并讨论了其进化和保护对策．红松的传粉和受精主要受天气条件的影响．林冠下的光照是控制红松幼苗生长和存活的主要因素．红松种子生产的周期性波动会引起有关动物种群的相应变化．动物是阔叶红松林生态系统中不可缺少的组成成分，松鼠在红松种群的天然更新中起着非常重要的作用．了解森林生态系统中物种的协同进化关系对于我们保护森林生物多样性和生态系统的完整性有着重要的意义．在红松的保护中，我们不仅要保护树木本身，而且还应当保护与红松相关的动物、生境乃至整个生态系统．

简介：密云水库集水区水源保护林在北京地区饮用水源保护中起着非常重要的作用．本文给出了该区小流域对比实验的初步研究结果，有林小流域和无林小流域对１９９６年７月３０日降雨过程较为一致的径流响应表明，土壤前期含水量对流域产流有较大的影响，在降雨较多土壤含水量较大的情况下该区产流方式可以表现为饱和地表径流．尽管该区以霍顿超渗产流为主，但对于１９９７年７月３１日至８月１日降雨过程，森林流域产流总量为１３９３．８０ｍ３，无林流域为２２０２．４３ｍ３，森林流域减少洪水总量３６．７％，消减洪峰流量达３７３％．然而，１９９７年７月１９日降雨过程森林流域径流洪峰量与洪水泥沙含量均较无林流域高，这表明预处理措施对径流泥沙过程有极为显著的影响

简介：在考虑地表流边界条件情况下，森林对降雨径流和泥沙的影响是一个非常复杂的过程．本文给出了水源保护林在自然坡面尺度上对径流泥沙影响的初步试验研究结果，森林在自然坡面尺度上对１９９７年７月３１日至８月１日降雨过程的洪峰流量消减率达４５５９％，洪水总量的消减率为６．８％，森林坡面径流总量为９８０．７８ｍ３，荒草坡为１０５２２３ｍ３．森林对１９９６年７月３０日降雨过程的洪峰流量消减率为１７．９５％，森林坡面的径流总量为１５．０８ｍ３，荒草坡为１８．３８ｍ３．从１９９６年森林对降雨径流较低的消减率看，降雨量与降雨强度对径流泥沙有很大的影响．

简介：ThedeforestationonlargescaleintheupperreachesofYangtzeRiverhascausedseriousproblemsofecosystemandenvironment.Restorationofthedegeneratedforestecosystemsisoneofthemainresearchfields.TakingGonggaMountainasanexample,degenerationfeaturesandexistingproblemsofforestecosystemsareanalyzedinthispaper,andthemeasuresarealsoproposed.

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简介：Background:Around2000plantspeciesoccurnaturallyinLorestanProvinceofwhich250speciesaremedicinalandmyrtleisoneofthem.Myrtleisashrubwhoseleavesandfruitshavemedicinalvalueandthus,ifmanagedandharvestedproperly,couldproducesustainedeconomicbenefits.Inrecentyears,however,overhalfofthemyrtlesiteareaswasdestroyed,duetoinappropriatemanagementandexcessiveharvestingpractices.Thus,comingupwithapracticalharvestingapproachalongwithidentifyingthosefactorsdamagingthesites,seemstobeverycrucial.Methods:Inourinvestigation,wecalculatedtheconservationvalueperhectareofmyrtleintheDoorehforestareainLorestanProvince.UsingtheContingentValuation(CV)andDoubleBoundedDichotomousChoice(DBDC)methods,wedeterminedthewillingnesstopay(WTP)formyrtleconservation.TheWTPwasestimatedwithalogitmodelforwhichindiceswereobtainedbasedonamaximumprecisioncriterion.Results:Theresultsshowedthat86.67percentofpeoplewerewillingtopayfortheconservationofthesemyrtlesites.AveragemonthlyWTPperfamilywascalculatedas$0.79.TheannualconservationvalueintermsofWTPforthepreservationofthemyrtlesitesinDoorehwasestimatedas$102,525.Amongthevariablesofthemodelpresented,educationhadapositiveimpact,whiletheamountproposedforpaymentandfamilysizehadanegativeimpactontheWTP.Conclusions:Ourestimateofthevalueofmyrtleconservationshouldprovidejustificationforpolicymakersanddecisionmakingbodiesofnaturalresourcestoimplementpoliciesinordertoconservethenaturalsitesofthisspeciesmoreeffectively.

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