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在蚂蚁河上游小流域以落叶松为试验树种进行不同立地因子造林试验,结果表明:不同地类上落叶松的地径、树高和近3年高生长量均以荒山荒地最高;落叶松树高生长以东坡和北坡最高,地径生长以南坡最大;暗棕壤上落叶松生长最好;土壤厚度与落叶松的各个生长量指标存在紧密的正相关关系。 相似文献
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丹江口库区柏树生长主导因子及生长过程研究 总被引:1,自引:0,他引:1
《湖北林业科技》2021,50(2)
为给困难立地造林提供技术支撑,笔者对丹江口库区柏树生长的主导因子和生长过程进行了分析。结果表明,丹江口库区的柏树生态林优势树种以柏木和侧柏为主(分别占60.87%和36.25%)。影响侧柏林分平均高的主导因子为土层厚度、土壤类型和坡度;最宜于侧柏生长的主导因子组合分别为:土层20 cm,黄棕壤类,坡度≤15°;土层20 cm,石灰土类,坡度≤15°。无论侧柏还是柏木,都更适宜于黄棕壤类土壤,但在石灰土类土壤上造林,选择侧柏比选择柏木成活率高,成林更早,后期生长更快。 相似文献
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红松果材兼用林经营技术研究 总被引:1,自引:0,他引:1
《防护林科技》2015,(12)
以哈尔滨市郊的黑山林场和丹青河林场内红松林为研究对象,采用样方标准地调查法,研究了最适宜红松林生长的混交模式,林分条件(林分密度、土壤、坡度)对产果量的影响,以及抚育间伐模式对红松生长量的影响。结果显示:红松+黄檗混交对红松的生长促进作用最大;林分密度1 000株·hm-2左右红松生长发育最适宜;中下坡位和厚度较高的土壤更有利于红松的生长发育;抚育间伐模式对红松的影响是透光伐+疏伐+卫生伐透光伐+疏伐透光伐不抚育间伐。 相似文献
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环境因子对浙江省重点公益林生物量的影响研究 总被引:4,自引:0,他引:4
利用在浙江省200万hm2重点公益林范围内取得的854个典型样地的调查资料,分析比较了不同地貌、坡度、坡向、坡位、土层厚度等条件下样地的生物量及其组成,结合林龄、立木数等指标,研究了环境因子对浙江省重点公益林生物量的影响,结果表明,(1)重点公益林现存生物量与地貌、坡向、坡位、坡度等地理特征密切相关,往往与平均生长量呈负相关。现存生物量随着地势的下降而下降,即中山>低山>丘陵;从坡向分析,西北向的平均生物量最大,南坡、东南和西南次之;从坡度看,以陡坡最高,急坡、斜坡次之,缓坡和险坡最低;从坡位分析,以上坡最高,中坡和山脊次之,下坡最低。(2)土层厚度是影响林地生物量的重要因素,随着土层厚度的加深,林地生物量迅速增加。年均生物量生长也与立地状况密切相关。年均生物量以丘陵最高,低山次之,中山最低;各坡向年均生物量由高到低依次为南、西南、东南、西北、东北、西、东、北;从下坡、中坡、上坡至山脊也呈逐渐下降趋势。 相似文献
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应用生态位进行森林资源评价 总被引:6,自引:0,他引:6
对森林生长的五个空间因子海拔、坡度、坡向、坡位、土层厚度进行调查统计,计算出在各空间因子上的生态位宽度、权重以及平均权重;以此来分析和评价森林资源。 相似文献
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We analyzed the influence of climate change over the past 50 years on the radial growth of two tree species: Korean pine (Pinus koraiensis) and Yezo spruce (Picea jezoensis), located on Changbai Mountain, Northeast China, using a dendrochronology approach to understand factors that limit the altitude for tree species. Elevated temperatures increased the radial growth of Korean pine and decreased that of Yezo spruce. The positive response of tree growth to hydrothermal conditions was the key reason that the upper limit of elevation of Korean pine followed the temperature fluctuation pattern. Increased temperatures and precipitation and longer growing seasons accelerated Korean pine growth. As the temperature increased, correlations between Korean pine ring-width chronology and precipitation changed from negative to positive. In Yezo spruce, increasing monthly temperatures and inadequate precipitation during the middle and late parts of the growing season led to narrow growth rings, whereas decreasing monthly temperatures and sufficient precipitation during the late growing season promoted growth. Rising temperatures and adequate precipitation increases Korean pine growth, possibly elevating the upper range limit in altitude for this species. In contrast, Yezo spruce growth is negatively affected by warming temperatures and limited precipitation. Under future temperature increases and precipitation fluctuations, the upper limit altitude of Korean pine can reasonably be expected to shift upward and Yezo spruce downward. 相似文献
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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
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Korean pine (Pinus koraiensis) and broadleaved mixed forest in Northeast China has been changed regressively into secondary forest with almost no conifers.
Planting Korean pine trees under the canopy of secondary forest is a feasible approach for recovering Korean pine and broadleaved
mixed forest. For establishing an effective growth promotion method for under-canopy planted young Korean pine trees, two
stands were selected as the experiment plots, Stand A (planted in 1989) and Stand B (planted in 1982), and an experiment of
microenvironment regulation was conducted relying mainly on Opening degree (K=1, K=1.5, K=2, CK) in 2004. The results were
shown that the adjustment had promoted growth of diameter and height of Korean pine planted in Stand A and Stand B, and had
a significant influence on the growth rate of basal diameter, diameter at breast height and height in the two growth stands.
The four years periodic increment of mean diameter and height of Korean pine planted in 1989 and in 1982 after regulation
in K=1 level were 63.4% (D0) and 82.7% (H), 64.8% (D1.3) and 69.7% (H) higher than that of control respectively. Quantitative regulation had significant influence on specific leaf
area of Korean pine planted in 1989, and the current year specific leaf area (SLA) was lager than perennial year SLA. Quality
indexes of natural pruning capacity, normal form quotient and crown size was not significantly changed but shown a positive
tendency. The regulation scheme of Opening degree K=1 might be proper for adjusting the microenvironment of Korean pine trees
planted under the canopy of secondary forest when the Korean pine trees were in the growth period of 15 to 26 years old in
the experiment region. 相似文献
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lNTRODUCTloNKorcanpincforcst'asaclimaxofcastlnounta1nsinNortheast-isalt"a}simportantobjcctforforcstcrstostlld}.AIthougllman}'cxpcrtsllax'cn1assi\'cI}'stlldicdthcdy'nal11icsproccssofKorcanpincforest.thcstudlesinsolllcaspcctsstilIIackdcpth'ct'cnl1at'cgaps.Sillccslnall-dianlcterKorcanpincsplayaIinL-lllgIbrlllerandlattcrroIcinKorcanpincforcstd}'llaIl1icsproccss.tl1cstudicsaboutsn1all-dlan1ctcrKorcal1pil1cs-origlnatiol1'gro\Y1l1cllaractcrandthcirrclatiol1stostandstnICt1Ircundoubtcd1}oflbr… 相似文献
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长白山北坡椴树阔叶红松林群落主要树种的年龄结构研究 总被引:14,自引:0,他引:14
通过对长白山林区椴树阔叶红松林伐根的大量调查 ,认为红松种群是由不同年龄阶段的群团状斑块组成 ,以多世代群居 ,优势世代之间没有一定的严格间隔期 ,在年龄结构图上往往出现两个或两个以上高峰。阔叶树在天然红松林中的分布呈群团状或散生 ,阔叶树的年龄也为异龄性 ,也为多世代共居。红松与阔叶树之间存在明显的动态消长关系 ,同龄伴生 ,异龄混生 ,形成复层异龄的针阔混交林 ,年龄结构与年生长关系的数学模型表明年生长量与年龄有正相关趋势 ,但林木年龄达到老龄时 ,生长有所减缓 相似文献
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INTRODUCTIONThcstcmfonl1ofnaturalKorcanpincforcst.ot\ingtothcsupprcsscdandshadcd,isvcry'difTcrcntt`iththatofplantation.Itis\'cry't'aluabIctostud}'thcstcmfonnforn1orcac-knot`lcdgcabouttl1ctrccd)-nan1icsofnaturalKorcanpinc.n1crcl1asbccnconsidcrabIcrescarchontl1cstc111for111cquationsasatoolforforcstmanagcmcnt,butitalmostbasnorclationshipt`-iththcbiologicalgrowthproccss.soitisx'ery'dimcuIttouscthccquationtoanalxrsisthcd\'amicsofstclllform.Hcrcthcdct'clopmcntofstcmformt"ascxPCctcdfornotonI\… 相似文献
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According to a great deal of field investigation and detailed indoor analysis, the natural regeneration pattern and process
of Korean pine population under natural Poplar-birch forest has been uncovered. The results show that the regeneration quantity
and quality of Korean pine population under mountainous Poplar-birch forest and mountainous white birch forest are better
than those under valley moss-grass White Birch forest and virgin broad-leaved Korean pine forest. Korean pine population shows
aggregated distribution, the mass-occurrence period of Korean pine population is behind the mass-occurrence period of Poplar-birch
population. Various aged Korean pines growth is affected by different stand structure factors. Man-made lighting tending can
accelerate the regeneration process and increase the regeneration quality of Korean pine population. It is feasible to set
up regeneration recombination of upper layer White Birch and lower layer Korean pines. 相似文献
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IntroductionKoreanpine(PinuskOraiensisSieb.etZucc.)isoneofthemostimportanttimberspeciesanditisnaturaIIydistributedinHeilongjiang,JiIinandLiaon-ingprovincesinChina.ManyforestryresearchersmadeextensiveandprofoundstudiesonthisspeciesJiangYiyin(1985)studiedthegroWthandgrowthmodelsforpIantationsofKoreanpine.However,veryfewpaperswerefoundonthegroWthmodeIsofnaturalKoreanpineforest.Koreanpinehasa1onggroWthperiod.ForextensivelymanagingKoreanpineforest,itneedstheJorestrytabIeswithhighac-Curacy… 相似文献
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IntroductionAgestructureoftrees,whichreflcctsrcge11eratio11processandvelocity,meansquantityoftreesdividingbyage.Broad-leavedKoreanpineforestwastl1etypicalzol1alvegetationofChangbaiMountaininNortheastO1ina,anditwastheprimarygymnospermconununitysurvivedaftertheQuatemaryGlacierPeriod.Alotofcommunityinf`)r-mationaccumulatCdinthestr-uctllreofforeststandsa11dgrowingprocessofindividualtrees.So,athoroughstUdyonagestructureanditsdistributiol1ofbroad-leavedKore-anpine.forestwouldprovidetl1eoretical… 相似文献