共查询到20条相似文献，搜索用时 140 毫秒
1.
红松是我国东北地区优势树种,也是营造果材兼用林的主要珍贵树种,发展红松商品林已经成为东北地区林业产业调整的方向。建设高标准的红松商品林基地,苗木质量是关键因素,抓好红松苗木生产,加速红松育苗体系建设,对辽宁省生态环境和山区林业经济建设的顺利进行,具有重要意义。 相似文献
2.
3.
4.
5.
6.
7.
红松是长白山植物区系的主要树种,阔叶红松混交林是l长白山植被演替中相对稳定的顶极群落。红松的生物学特性是幼龄时期有较强的耐阴性,同时具有很强的可塑性与适应性,这是次生林培育诱导冠下红松造林的重要依据。另外,红松较其他树种寿命长,具有长期、持续稳定的生长期,尤其在幼龄时期生长较缓慢,且有比较突出的耐阴性,能在次生林冠下生长发育,所以红松在次生林冠下成活率及保存率相对较高,这是次生林冠下红松造林的前提。 相似文献
8.
9.
<正>红松(Pinus koraiensis Sieb.et Zucc)是主要分布于我国东北林区的重要用材树种和经济树种。为了研究探索在红松分布区外的河北坝上地区培养红松果、材、防护兼用林,提高林木的生态、经济和社会效益,丰富塞罕坝林种和树种结构,塞罕坝机械林场于2008年启动实施了"樟子 相似文献
10.
11.
IntroductionGaPSinforestSwereoftenfomledduetobigtreesfalldown.Regenerationandgrowtl1inthegapsincreasebe-causeofIheAnprovementoflightcondition-Thegapwillbefilledwithnewregeneratedtrees.Wattnamedtl1isforesIdynamicsastheforestgrowtllcycle.SinceD.Bot-kindevelopedthefirstGapmo`Iel(JANOWAnlodel)basedontheforestgrowthcycletheory,dleresearchongapmodelbecameoneofthemostactivedirectio11slilecologybecauseofJANoWAnlodeI'ssuccess.H.Sl1ug-artandhisstUdentSmadegreatc()ntributio11stogapmodeI'sdeve… 相似文献
12.
Large scale harvest of Korean pine(Pinus koraiensis) seeds as a food product in the mixed Korean pine-hardwood forest of northeastern China poses a serious threat to the sustainability and restoration of this endangered regional ecosystem.Seed collection over past decades greatly reduced the seed bank and subsequent seedling and sapling recruitment,and impacting a wide array of granivorous animals that rely on the pine seeds.We surveyed Korean pine seeds,including solid seeds(SS),insect consumed seeds(ICS) and other(animal) consumed(OCS) kernels,of the seed bank(forest floor and the top 10 cm of mineral soil),the seedlings and saplings from 1 m 2 sample plots in five forest types in Liangshui Nature Reserve(LNR) of the southern Xiao Xing’an Mountains in northeastern China to provide accurate information for assessing the Korean pine regeneration potential.The average number of pine seeds in the seed bank were 11.2 seeds/m 2,9.1 seeds/m 2,4.6 seeds/m 2,1.1 seeds/m 2,and 0.2 seeds/m 2 in Korean pine-basswood forest,mixed Korean pine-hardwood forest,mixed conifer-hardwood forest,white birch forests,and oak forests,respectively.In the first three forest types,percentages of SS(potentially viable seeds) were 11.2%,3.5% and 27.8%,respectively.The percentages of ICS(not viable seeds) were consistent at around 35%.The higher but variable percentages of OCS(not viable seeds) indicated high seed predation in these forests.Compared with other studies,we recorded higher percentages of seed damage,probably due to our survey approach and the increased depth of seed bank sampled in our study.Depletion of pine seeds in the seed bank greatly reduced seedling and sapling recruitment.Densities of pine seedlings varied from about 180 trees/ha in the mixed Korean pine-hardwood forest to about 5,400 trees/ha in the mixed conifer-hardwood forests and showed a high degree of spatial variation.Saplings were rare in the mixed Korean pine-hardwood forest,but ranged in the thousands in other forests.Large scale pine seed harvest has seriously threatened the sustainability of the mixed Korean pine-hardwood forest ecosystem.Scaling down the seed harvest or supplemental planting of pine saplings are urgently needed to maintain the health of the existing Korean pine forests and to restore this endangered ecosystem. 相似文献
13.
INTRODUCTloNbePthemp`vkoItw)isanli11pe1tclhabepeicinnoed1castO1ina.Thcspeic~rminn1bo\vithInanyhar~~,inbotScalledndbroadileated/KOrCantwthisisthecham~honin~toinla.bendboare~lycalledKrsPincbofOrdnd.ThebohavcboexPloitalforwtahalf~,withiISareabeing~boIhan5oto5~inthiswil,].TO-tw-oroldgrowthbonaatonlyiminfewedwr.beusePaSttimeduetOwithe~mCChanisl1isofthenabotwpePlanboonsofKrsptheunmaseeqclear~ofhsenahahenrstaredanopmcaedtyforndnd'l,.ndmamAnboontisetOPofnd3l.Hot`toodthehighqtaltyorboPli… 相似文献
14.
Introduction
Korean pine (Pinus koraiensis) is a dominant tree species in the cold temperate mixed forest zone in eastern Eurasia. Its seeds are food sources for wildlife but have become an important and marketable part of the economy for local communities. 相似文献15.
lNTRODUCTIONTherhythInofKorcanpinegrowingandtrpearchitectUreissubjectedtoitsownl1crcd-ityandforeststructUre.Tl1cil11portantefTcctsofgapdynamicsarethereasonsthatmaketl1cKoreanpinetrceformhighqualityoftimbcr.Whilecurrentn1anagemcntofKoreanpincforestmainlyfocusesonpurestand,thccco-logicalrelationshipsbetWcenKoreanpineandothcrsPecicsinaconununityareneglected,thcprimitivebiologicalconditionislost.TheKo-reanpinetrecsinplantationcasilydivergeonthctOpofmainsten1,thesescverelyaITectthcgrOedqu… 相似文献
16.
以通化县林业局三棚林场为例,论述了红松采种林基地建设的有关技术设计方案及经营管理措施。进而阐述了保护和开发好吉林省东部地区红松优良种质基因资源,对恢复吉林省东部森林生态系统,改善生态环境,建设生态省,实现可持续发展的战略规划具有重大意义。 相似文献
17.
1NTRODUCT1oNMaoerMountainliesintheeasternpartofnortheastChinamountainareawithinthenaturalgeographicaldistributionrangeofavaluabletimberspeciesofKoreanpine(PinusKoraiensis).Foraboatmorethanlooyears,cuttinganddestroyingcontinued;f9wnaturalprimaryKoreanpineforestsleft.AlargeareaofKoreanpineplantations,nevertheless,has'grownupastimegoing.Itisapressingproblemforushowtocultivatethemwell,andtorecoveranddevelopthemraPidlyinourforestproductionandscientificresearch.FortheKoreanpinetree,peopledid… 相似文献
18.
INTRODUCTIONKoreanpine(Pinuskoraiensis)com-'monlyoccursinmixtUrewithsomehardwoodsPeCiesand,natUrally,becomesold-growth"forestcalledmixedbroad-leaved/Koreanpineforest.ThenatUralforestsmainlydistributedinnortheastChina.TheconesofKoreanpinearelarge,measuringupto2ocminsize.The....,iscalescannotopenuptoletthebig,winglessseedsoutwhentheconesbecomingdry.UndernatUralcondition,theseedsdon'tgerminateuntil2winterslater,buttheseedsinconesusuallybecomerottenowingtofungusorareforagedbysmallrodentsa… 相似文献
19.
New Forests - Primary physiological dormancy and secondary physiological dormancy of Korean pine seeds restrict the regeneration of broad-leaved Korean pine (Pinus koraiensis) mixed forest. Dry and... 相似文献
20.
IntroductionItissurethatpresentelevatiollsofCO2a11dotllergrcc11-housegasesinducedbyhumanactivitiesaren1akli1gglobalclimategothroughinexperielICedcl1anges(Scl1le-subgerl987).Thecurrentquasi-equilibriulllstatesofbio-sphereecosystCm,esPeciallyterrestrialecosystems,wouldbebrokenbecausetl1estructure,fu11ction,distributio11andtlledynamicsofanyexistedecosystemsareIberesultsoflongtermadaptationofbio-systemtocurrentclin1ate.Theec()systemsdistributedinhighlatitlldeareawouldhavemuchbiggerchai1ge(Bona… 相似文献