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1.
DETERMINATION ABOUT THE NORTHWESTERN AREA LIMIT OF PINUS KORAIENSIS AND THE GEOGRAPHIC OCCURRENCE OF PINUS SIBIRICA 总被引：1，自引：0，他引：1
Zhao Guangyi Hou AijuNortheast Forestry UniversityYangChuntianCommittee of Science Technology of Hcilongjiang Province 《林业研究》1991,(1)
By investigation,studying and discussion for 9 years,the determination that it shouldbe Pinus sibirica growing in the Mohe county,Daxing'anling Mountains area,China,ratherthan pinus koraiensis there,is made to correct a false argument in some works from 1950s’till nowthat Pinus koraiensis area limit reach Daxing'anling Mountain.The results are as follows:(1)Thespecies so called as Pinus koraiensis found in northwest of Daxing'anling.Mountain is PinusSibirica indeed;There are no natural distribution of Pinus Koraiensis in Daxing'anling Mountain.Its northwest area limit only reach Shengshan,Aihui county;(3)There is about 500km of space be-tween the area limits of Pinus koraiensis and that of Pinus sibirica,no mixed growing area.Accord-ing to above,a sketch map is made to describe different area limit of the two species at Daxing'anl-ing Mountain and nearby. 相似文献
2.
Through the polyacrylamide gel clectrophoresis analysis of thirty-two needlesamples of ninty-years old pinus koraiensis in Harbin,seven typies of zone and distribution ofthe zone frequency,and some objective fact of heredity and variation were determined.Theseinformations can be used as reference materials in the research of heredity and variation of pinuskoraiensis. 相似文献
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INTRODUCTIoNPinussylveslrisvar.mongolic(lLitv.isoneofthemostimportantcommercialco-nifertrees,withsofttimber,straightgrainandhighercraftvalue,iswidelywidelyusedandpaidattentiontoinalltradesandprofessions.TheintroductionareaofthissPecieshasreachednortheast,northwestandnorthChinaandhasbecamemainspeciesforcheckingwindandcontrollingsand,turningthepfoursidesygreen,andornamentingforcourtyard.ThegeographicdistributionofPinussylvestrlkvar.mongolicais:thepurestandfromQiqian,Mangui,Huzhoug,Xinlint… 相似文献
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INTRoUUCTlONKorcanpine(Pin1lskoraensis)isanimPOrtantdominatingandfinetimbersPeciesinthevirginfOrcstsinNortheastChina.Fornearly3oyears,therateandquantityofcxploi-tationexceeditsownrccoveryabilityb3'far,itsnaturalresourccshavebccndiminishcdtartly.ThenaturalKorcanpineresourceshavcbeendCCreasedfrom53.8%inl95o'sto5.8%inl99o'softhctotalfOrestland,anditsvol-umcsfrom74.3%inl95o'Sto6.9%(l99o).ltsnatUralregencrationdevelopsslowlyandtakesmuchlongtimctorecoveritsresourccsifitonlyreliesonnaturalre… 相似文献
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The metabolism of fats,proteins and carbohydrates and change of enzyme ofseeds of pinus bungeana during the germination were conducted by the methods of gas-—liquid chromatography,flow injection,colorimetric analysis of spectrophotometer,toprovide theoretical basis for seeds dormancy,germination and storage of seeds of foresttree.The results indicate that(1)carbohydrates were first utilized during germination ofseed of pinus bungeana;(2)stored substances in seeds began to decompose quickly afterradicale broke through seed coats;(3)the activity of enzymes in the seeds does not alwayscoincides with the increase or decrease in quantity of its responsible substance duringgermination of the seed.Changes in stored substance relate to metabalism of othermetabolism of other materials and the use of hydrolysates. 相似文献
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INTRODUCTIONWiththedevelopmentofcomputerandseniorthehnology,imagcprocessingtechnol-ogr-hasmadeagreetprogrssandbeenap-pliedtomedicalscience.mechanicalflawde-tection,industrialcontrol,geologicalprosPeCt-ing.archaeology,astronomy'chemisty.'Phys-icsctc.Eventhoughithasjustbeenappliedinwoodscicnceforashorttime'imopprocess-ingtechnologyshowabroadprosPeCts.Thesegmentationofimagepsdthecollcc-tionofimageboundaryisoncofthemostclas-sictasksforstUdyinimageproc6ksing,imagcanal}'sisandcomputcr\,ision.… 相似文献
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INTRODUCTl0NLarchandMongolianscotchpincareimportantafforestationtreespeciesinnorthofChina.Theyhavestraightbek-goodqualityoflumbcrandresistancetoharmfulenviron-lllcntPl1}siologicalstudlesonthetWospeciestt;as\ery'fcxv'andcomparatlvestUdyonthemlsblank.Wcstudicdphy,si0logicalcharactcris-ticsofsolllctrccspecicsatdifferentsitccondi-tioninrcccnt\'cars'andfoundthatatswelter-ings[ll11l11crda}}'oungtrecsofsomcspecies(Korca11pinc.Mongollal1scotchpine-etc.)hadnonctph0tos}'nthcticratc.i.e.respiration… 相似文献
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INTRODUCTlONThemixcdbroad-leaved/Pinuskor`IiensiSforestwhichisoneofthemainforestsofNortheastChina,isintlleCllangbaiMountail1s(JilinProvince)a11dtheXiaoxing'anMotu1-tains(inHeilonroIangProvince).Thisistl1empicalmixcddeciduous/co11iferforestvegcta-tionofthcarca.But,duetocuttingandanunbalancebctWeenharvesti11gandanntlalin-crement,themixedbroad-leaved/PinuSko-raiensIjforestsha1,ebeenreplacedwithsec-ondaryforests(includingthelargearPaofsecondaryforestleftfrol11thepast)sinceltsclearcutti… 相似文献
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lNTRODUCTION7twuscu3Pidalaisalsocalled'Japaneseyex`,ricetree,redCyPresspine,anditisaprecioustreeremainedoftheTertimpPeriod.ltmainl3'growsinthemountainareasoftheeastofl1ortheastof5o()-l()oOmabovesealcvel,t"itllcoldhumidacidsoiI.Itoftengrowsintheforest,enduresshadeandtvctsvers't'ellandgrowsslo.,1y.ItiscultivatedinShandong'Jial1gsh1-.Jiangxi,pro\IincesofChinaaswellasNorthKorca'RussiaandJapan,Thequalityol'itstimberisfinc.Thc\'einisstraight.Itstcxturcisfineandcloscal1drichinresilience.T… 相似文献
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INTRoDUCTIoNSkiddersoftentravelinnoroodorbadroadcircumstances,thusleadthedriv-ertofatigueandreducetheworkefflciency.Ifadriverworksundertheseconditionsforalongtime,hewillsufferfromoccupationaldisease.Asergonomicsdeveloping,itprovidesabasicmethodfordesigningasafeandridingcomfortab1eseatwhichisapplicableforskidder.Thein-fluenceofthevibrationuponthehumanbodyisanimportantaspectofergonomics.ThispaperdealsmainlywiththevibrationcharacteristicsofthechairofhomemadeJ8oskidder.THEVIBRATIoNCHARA… 相似文献
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FoRESTFUELCoMBUSTIoNVALUECombustionvalueisanimportantparameterofmaterialburningcharacteri-stics.Itmeansthattheheatreleasesfromtheunitofmaterialcompleteburningtocooldownthestartingtemperatureofreactionmaterals(l).Undertheconditionofthesamepressureandenoughoxygeninthecombustor,materialscombustionva1ueisrelatedtotheinnerenergyofthematerialstatefromthebeginningtotheendduringreaction.Thecombustionvaluesuchasmeta1,carbon,hydrogencanbemeasuredaccurate1y.Toforestfuels,theirenergycan'tbethesam… 相似文献
12.
5,10,15,and 20 year old Larix gmelini and Betula platyphylla were used aspulping raw material in the research.The examination of young L.gmelini and B.Platyphyllafibrous structures showed that the fiber length and ratio of length to width of 5 years old L.gmelini noticeably differed from that of mature L.gmelini.but that of 5 year old B.platyphyllawere nearby equal to that of mature B.platyphylla.The research results indicated that 15 yearsold B.platyphylla and 20 year old L.gmelini were best suited to pulping among the eight exper-imental raw materials;10 years old B.platyphylla and 15 year old L.gmelini were optimal tothe ratio of beating degree increment and corresponding beating time.The pulp characteristics of15 year old B.platyphylla and 20 year old L.gmelini were similar to those of mature wood,andit was feasible to consider 15 years to B.platyphylla and 20 years to L.gmelini as their rotationperiod;10 years and 15 years as their thinning cycles for the papermaking forest base. 相似文献
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THEACTIONLAWoFADULTThcadultsofOsierweevilwereobservedonafixedspotinfieldandraisedindoorsandinfieldseparatelyinl987-9o.Theboxes(4()x4()x6ocm)ineachofWhichl5pairsofadultswereplacedwereusedwiththrcere-peats.Thesamesizesofboxesinwhichtl1eadultsxvcrcraisedx`eredesignedindoorswithtWorepeats.l5canswerealsousedineachofwhlchapairofadultwasplaced.ThefreshbranchesofPoplarthattheadultswcrelikctoeatt`crereplacedilladayabout.ThcEmcrgcnccLawofAdultOsierwecvilstartcdemergenceinthclasttendaysofJuly.… 相似文献
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FORWARDInwood-processingproduction,theeffectivewaytoraiselogutilizationandobtainthebesteconomicalbenefitistohaveaoptimumandreasonablesawcut-tingscheme.Thedeterminationoftheoptimumsawcuttingschemeshou1dbemadein1ightoflognaturalconditions,suchasitsgeometricsize,theoutlinesofthecrosssectionsatitsoppositeends,itsgeometricshape,andalsobasedonsawingwoodspecificationsacquiredandontheprincip1eofoptimumloguti1izationandthebesteconomicalbenefit.Inrecentyears,theresearchpapersconcerningthemethodsofgeom… 相似文献
15.
INTRODUCTloNA.senlicosusductoitsimPOrtantmedical..l.lil,wasanimPortanteconomicshrubinKoreanPinebroadleavedforestsanditsscc-ondaryforestsinnortheastChina.Unform-nately,itssecdswasofaninfriavquality,withitscongenitaldormancyaslongasoneyearormore,increasingtheriskofseedsinthescedPOoltobeeatenanddecaycd.Sexualreproduc-tionwasrathcrdifficuIt,sothatwasraretobcseenundernaturalforcsts.ThebioIog3'ofseeds,secdpool,dispersion,rcservesandits-regenerationwerercportcdI'l.EXPEREMENETALSlTEAND… 相似文献
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Seed deterioration is an irresistible physiological phenomenon.The aim to studyseed deterioration is to see if seed deterioration can be retarded artificially and the higher seedvigor of fine varieties be maintained.The change of seed deterioration occurs in almost every sys-tem,and affects many kinds of enzyme and almost all organelle,as a result,the seed loses its vig-or.The reason of seed deterioration and the lost of seed vigor are mainly studied and discussed inthis paper.According to the external and internal two kinds of theory advanced by E.H.Roberts,Much deep discussions are made from the view of biochemistry. 相似文献
18.
Withthcde\ elopmentoftheprocessauto-lllation'therequirementoftheproccssanalyti-calinstrumcntsusedinIargeequipmentandfacilitiesofthesteclt`7orks'chen1icalindustrr'-orthcfuclclcctricplant.getshigherandhighcr.Theapplicationofthcseanalyticalinstrumentsca11il11prot'candcnsurctl1cqualit3'ofproduCt'reduccthcraxvmaterialconsumption-rclicvcthcx"orkcrs'incrcasethclaborprodUctivity',accclcratethedc\lcloplncntoftheindustrialprod[lctiongrcatl}'.Inothcrwords.withouttl1ewideuseoftheprocessanalytIcallnstrumc… 相似文献
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Xiang Kai FuNortheast Forestry University 《林业研究》1993,4(1):1-5
Since the shelterbelt systems of 1,092,260 hm~2have been established for thirteenyears from 1978,have formed 526,541 networks and protected 13,619,400 hm~2 land in westernpart of Northeast region of China.According to the research work we did in the last five years,the results of research project showed that the shelterbelts had improved the environmentsignificantly.A parameter of comprehensive effects of temperature,moisture and wind in thenetworks(E_c=246.52-12.17E+0.58T+6.58U)which is an active method to estimate the effects ofshelterbelt on farmland,is around 21.1-30.9mm/month improving the moisture state in dryseason,helping the crop yield increasing on the average by 19.8%.The effective accumulatedtemperature(≥10℃)incrcases by 71℃;the cropland area which suffered from wind and frostdamage decreases by 80-90%,the grass coverage on the pastureland and grass production in-creases by 13% and by 49.4-72%,rough protein,rough fat and nitrogen-free extract of grassincrease by 3.34%,2.4% and 8.4%separat 相似文献