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通过研究透光抚育对黑龙江省东部山区张广才岭不同坡位立地上“栽针保阔“红松林群落的影响,指出透光抚育是调节“栽针保阔“红松林群落树种组成结构及其种间关系的有效措施。 相似文献
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采用样带网格调查法和分层株数法,研究了不同抚育强度的"栽针保阔"红松林群落结构及动态变化趋势,定量评价了不同抚育强度对其群落结构及动态的影响。结果表明:栽针保阔红松林群落的郁闭度由大到小,重要值增大(0.300~0.708),在群落中的优势地位上升;红松中径级林木比例增加,小径级林木比例减少;各群落总体上均呈现出向红松针阔混交林进展型演替趋势,但以中、低郁闭度群落演替趋势较好。 相似文献
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评价不同透光强度对"栽针保阔"红松林水源涵养功能的影响,为充实和完善"栽针保阔"经营体系提供理论依据。该文以不同透光抚育强度辽东山区"栽针保阔"红松林为研究对象,分析林地枯落物和土壤的水文特性,结果表明:中度透光抚育和全透光抚育林地枯落物储量分别高于对照(未栽红松)65.67%、28.49%,但全透光抚育与对照之间差异不显著(P0.05);枯落物最大持水量表现为中度透光全透光抚育对照;中度透光抚育的土壤容重显著低于其他两块样地(P0.05),最大持水量显著高于其它两个样地,分别为全透光抚育样地的1.46倍和对照的1.50倍。土壤的毛管孔隙度、非毛管孔隙度和总孔隙度,3块样地之间差异不显著(P0.05);3块样地表层土壤的初渗速率3.79~5.33 mm·min~(-1),稳渗速率1.00~2.75 mm·min~(-1),中度透光样地表层土壤的初渗速率和稳渗速率均明显高于对照,分别高出对照26.60%、175%。全透光样地初渗速率略低于对照,但其稳渗速率明显高于对照。从枯落物持水性能和土壤层的蓄水和渗透性能评价透光抚育对林分水源涵养功能的影响,认为中度透光抚育更有利于林分贮蓄降水,减少水土流失的产生。 相似文献
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文章就透光抚育中如何栽针保阔,保留天然幼苗幼树,保留均匀密度和生长抚育中如何保留针阔叶树,选择采伐木,丛生树的去留,保留母树等几个技术问题,阐述发生偏差的原因,危害性及其解决办法。 相似文献
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采用样带网格调查和多样性指数分析方法,研究了透光抚育(全透光、半透光、未透光)对人天混红松林群落植物多样性(丰富度、多样性指数和均匀度)的影响效果,并与天然次生林群落进行对比分析,定量评价了40年生人天混红松群落植物多样性的恢复效果。结果表明:全透光和半透光群落的物种丰富度较未透光群落增加了8.0%和24.0%,但较天然次生林群落却分别下降了18.2%~27.0%和6.1%~16.2%,半透光抚育更有利于该群落物种丰富度的恢复;全透光和半透光群落的物种多样性指数分别较未透光群落提高了3.38%和20.8%,与相应天然次生林群落的变化幅度分别为-8.70%~8.66%和6.69%~26.98%,也是以半透光抚育方式恢复效果好;全透光、半透光和未透光群落的物种均匀度相近(变化幅度在0.02%~10.7%之间),但三者与天然次生林群落有较大的差异性(变化幅度依次为-5.2%~18.2%、4.9%~30.8%和-5.2%~12.6%),半透光抚育群落物种均匀度最高。 相似文献
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小兴安岭阔叶红松林林分结构与修复 总被引:1,自引:0,他引:1
小兴安岭阔叶红松林(Pinus koraiensis)是地带性顶极植被.本文以黑龙江丰林国家级自然保护区阔叶红松林为研究对象,系统分析小兴安岭阔叶红松林林分类型分布的斑块和年龄特征、垂直分布特征,论证郁闭度对红松群落数量、幼林生长群落的影响,阐述不同林分类型对红松天然更新的影响、上层林冠抚育对红松幼树的影响、上层林冠抚育强度对红松生长的影响.结果证明:透光抚育为红松提供了良好的生长空间,上层抚育可显著提高林冠下红松幼树的高生长、地径生长和保存率,提出了小兴安岭阔叶红松林生态修复的策略. 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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Broad-lcafKorcanpi11cforcstbccol11csPoplar-bircl1forcstaftcrburntandfcllcdinbigarcas.Ca11tl1iskindofPopIar-bircl1forcstrccot'crtoclin1axco1nl11unity-trirginbroadlcafKorcanpincforcst9Whatistl1erclationsl1ipbctt`.ccnPoplar-birchforcstandKorcanpil1cforcst?Ho`"docsKorcanpincPOpu1ationrc-gencratcundcrnaturaIPoplar-birchforcst?AllthescprobICInsl1a\'caIrcad}'attractcdforcstcrsattcntionforaIOI1gtil11c.Tllccarh'studicsshox'cd:itt'asinct-ita-blcthatbirchforcstcouldfonnonbun1ingsitesx"ithil1t'irg… 相似文献
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东北地区阔叶红松林恢复的相关问题研究 总被引:4,自引:0,他引:4
东北林区现有林经营面临的首要任务是恢复阔叶红松林。栽针保阔是恢复阔叶红松林的科学理论,但还需时间的检验并不断完善。天保工程的实施为提高现有林生产力、恢复阔叶红松林提供了历史机遇,但在实施过程中还存在诸多问题,需要转变观念,正确认识。以近自然森林经营理论为指导,适当发展红松人工林具有重要意义,落叶松人工林可以通过人为诱导向阔叶红松林发展。传统意义上的封山育林不利于阔叶红松林的恢复,应由“封山”向“育林”转变。 相似文献
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通过套种造林、封山育林、抚育改造等措施,将马尾松纯林改造成针阔混交林,以改变树种结构单一、地力日益衰退、病虫害逐年严重、林地灌木杂草丛生、火灾频繁发生、林分产量低下等状况。结果表明:在松林下套种阔叶树,可不同程度增加单位面积阔叶树数量,形成明显的层次结构,能充分利用林地中的营养空间,马尾松和阀叶树在各自不同层次生长范围... 相似文献
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INTRoDUCTIoNBroad-lcavedKoreanpincforcstisthczonalclimaxecosystcminnortl1castmountainsofChina.Itisknot"nasdivcrscsPCCicsandsPCcialindicatorinthcnortl1cmtcmPCratcforcstty'PCsofthccarth.Bccauscthiski11dofforcstllashighproductivityandlargcasscss-ment,andiscomPoscdoflnany'\1aluabIccoIl1-mercialtI-eesPCcicssucl1asI,inuskoraicnsi3,Fraxinusman'I3huricactc.IthasbecncutoverinIargcarcasduringtl1clastscveraldcc-adcsandtl1coldforcstI1asbccndamagcdscri-ousIy.Noxt'n1ostoftl1cml1a\'cbcenreplacc… 相似文献
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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
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以红松人工林地表可燃物为材料,在实验室内的各级风速条件下,对火行为预测中争议较大的风因子预测模型进行了点烧实验及适用性分析,结果表明,风速在0.9~4.6 m/s时,现有风因子模型对红松林下可燃物而言,只有个别较为适用,其中含可燃物属性的复杂模型(Rothermel模型)适用性较强。 相似文献