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阔叶林采伐迹地人工促进更新效果研究 总被引:1,自引:0,他引:1
通过对常绿阔叶林采伐迹地人工促进更新而形成的米槠林群落特征的研究,分析比较了人工促进更新林分与杉木人工林的生物量及生态,经济效益。结果表明,人工促进更新的米槠群落和生产力和经济效益均高于杉木人工林,林分总管蓄积量比杉木林高11.87%,总生物量比杉木林高22.10%;人工促进更新的投资利润率和财务内部收益率分别比杉木人工林高4%和11.03%。 相似文献
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浅谈阔叶次生林的人工促进天然更新 总被引:2,自引:0,他引:2
人工促进天然更新是恢复和发展天然阔叶林的重要更新方式,具有投入少、恢复快、收益大和易于实施等特点.人工促进天然更新的阔叶次生林与人工营造杉木林样地比较结果表明,在同一立地条件下,同龄阔叶树的树种种类、郁闭度、生物多样性、高径比等各项生长指标均高于人工杉木林.文中阐述了人工促进天然更新中的抚育间伐、林分改造、封山育林和封禁保护、补植等具体措施,并提出保护现有阔叶林,实施人工促进阔叶林天然更新,扩大水源涵养林、水土保持林等防护林比重等建议. 相似文献
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通过对定海松林及更新层的调查,发现多数松林在皆伐后演替为落叶阔叶林,少数为常绿落叶阔叶林和灌、草丛。更新树种共计34种,占优势的仅9种,且多为落叶阔叶树种。针对演替类型及更新树种存在单调贫乏的现状,结合海岛具体实际,提出封山育林、人工造林和树种选择的方向性建议,将为松村线虫病除治迹地的更新改造提供依据。 相似文献
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马尾松阔叶树混交林不同更新方式对林分生长的影响 总被引:1,自引:0,他引:1
通过对将乐县马尾松阔叶树混交林进行天然更新、人工促进天然更新和人工营造杉木林等3种更新方式的林分恢复调查,比较探讨其生长量、生物量及物种丰富度,结果表明:不同更新方式对林分生长、林下植物发育及林分物种丰富度影响较大,采用天然和人工促进天然更新形成的阔叶树林分树种多样,结构稳定,生长良好,是保护和发展阔叶林的一种有效途径。 相似文献
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根据辽西地区的自然条件和人工刺槐林生长情况,通过采用留伐根,刨伐根,刨伐根并犁沟三种萌芽更新方法试验,分析了不同更新方法更新后萌生株数和生长情况,提出了刨伐根和刨伐根并犁沟两种较为理想的更新方法和适用范围,人工刺槐林萌芽更新采用刨伐根和刨伐根并犁沟方法更新后不仅萌生株数多,而且分布均匀,更新效果好。 相似文献
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辽宁省天然阔叶林集中分布在东部山区,是我省工农业生产重要绿色屏障。当前,森林采伐更新主要采取采阔造针方式,天然林面积减少过猛,人工更新树种单一化。通过化森林经营体制改革;调整树种、林种结构,采取人工更新与与天然更新相结合的方式,封山育林以及科技兴林措施,达到天然阔叶林合理利用、保护和发展目的。 相似文献
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以一个生态林业的试点,阐述了发展林业生产,扩大森林面积的目的不是单纯要得到木材,而是谋求生态系统平衡,造福于人类,保证人类良好的生存环境,使人类兴旺发达。其内涵包括:封管好次生阔叶林、发展立体林、人工促进天然更新、保护山顶灌丛和矮林以及林内产品的开发利用的综合治山方法。 相似文献
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Kakamega Forest is the last remaining rainforest in Kenya and the easternmost remnant of the Guinean-Congolian rainforest belt. As such, it is home to a large number of endemic fauna and flora species. Yet the remaining natural forest is under imminent threat of degradation due to a rapidly growing population in its vicinity and a poverty rate far above the national average. The growing demand for forest resources and ecosystem services will continue to exert great pressure on the remaining forest fragments. In this paper, we predict future hotspots of forest clearing of the remaining natural and old-growth secondary forest in Kakamega Forest. We parameterized an artificial neural network model using resilient backpropagation to simulate the likelihood of forest clearing for each location. Input variables into the network included historic information on forest clearings together with variables capturing the status of forest protection, accessibility to roads and markets, as well as topography and forest density. Simulation results were used to predict future clearings based on observed rates of change. Hotspots of forest clearing were derived by assessing the neighborhood density of predicted clearings. 相似文献
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We conducted a study to examine the pattern of development of herbaceous plant species, woody species regeneration and soil physical characteristics after tree uprooting in 20-ha areas of Experimental Forest Station of Tarbiat Modares University located in a temperate forest of Mazandaran province in the north of Iran. Soil bulk density, soil texture and moisture from pit and mound (PM) were measured in the laboratory. Results show that the soil bulk density was most in soil deeper layers at mound top, and the soil moisture content was most in soil deeper layers at Pit bottom. Our study supports that the micro-topography of PM (pit and mound) topography will create a mosaic of environmental conditions. This environmental heterogeneity could be responsible for the diversity of herbaceous plant species and regeneration of woody species. It is recommend that the fallen trees with PM structure should remain in the protected area without clearing as the best option for forest restoration. This information can be useful for forest management that attempts to emulate natural processes. 相似文献
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3种皆伐方式对毛竹林更新生长的影响 总被引:1,自引:1,他引:0
研究了不同面积规模的全面皆伐(2.0 hm2和3.33 hm2)、带状皆伐(带长均为60 m,带宽分别为3m、6 m和9 m)和块状皆伐(25 m2、100 m2和400 m2)对毛竹林更新生长的影响。结果显示:3种皆伐方式对竹林更新生长影响不同,其中全面皆伐后的竹林长势较差,生物量较低,且皆伐面积越大,竹林更新生长越差;带状皆伐,皆伐带宽为3 m和6 m的竹林更新生长状况均较好,以带宽为6 m时综合效果最好;在块状皆伐中,皆伐面积为25 m2的竹林更新生长最好。此外,皆伐后对毛竹伐桩进行施肥,能够促进竹林的恢复生长;竹林的坡向也影响林分的更新生长,阴坡林分通常在皆伐后2年即能恢复到皆伐前状态,而阳坡林分的恢复则需要3年以上。 相似文献
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基于天然林资源变化的贵州天保工程成效评价 总被引:1,自引:0,他引:1
利用贵州省天然林资源保护工程区的4142个森林资源连续清查固定样地复查数据,进行工程区天然林数量、质量的动态变化及成因分析。结果表明,天保工程通过禁止天然林采伐、开展森林管护、封山育林和人工促进天然更新等措施,有效地促进了天然林资源的持续快速增长、森林群落结构的改善、森林质量及森林生态功能的提高。 相似文献