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1.
我国营林、集材拖拉机的基本情况及分析 总被引：2，自引：0，他引：2
介绍了营林、集材拖拉机的特点及我国营林、集材拖拉机的基本现状和发展历史;分析了营林、集材拖拉机目前的需求状况及市场前景;提出了保留和发展营林、集材拖拉机的必要性和意义. 相似文献
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栾柯 《林业机械与木工设备》1978,(3)
绞盘机是林海—35营林拖拉机的工作装置之一。在设计该拖拉机的绞盘机时,我们对国内外集材拖拉机绞盘机的结构进行了分析比较,认为加拿大“廷伯杰克”(TIMBERJACK)404型集材拖拉机的绞盘机结构较为先进,林海—35营林拖拉机的绞盘机就是参照其结构而设计的。 相似文献
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1问题的提出 哈尔滨拖拉机厂是我国唯一一家生产林业集材拖拉机的工厂,林业拖拉机制造技术处国内领先水平.20世纪60年代开发生产的集材-50A履带式拖拉机及其随后工厂自行研制生产的集材-80A型拖拉机在国内市场上处于垄断地位,除满足国内市场需求外,还多次出口印度尼西亚、俄罗斯、赞比亚、马来西亚、索罗门群岛、坦桑尼亚等国家和地区.集材-50A拖拉机是部优产品."七五"和"八五"期间工厂引进了美国卡特彼勒公司的轮式营林集材拖拉机系列产品底盘制造技术及部分关键设备,使工厂在林机产品开发、工艺手段及检测水平上又有了新的提高.但由于国家在20世纪80年代后期实施"天保"工程,实行封山育林并限制采伐,使得林业集材拖拉机的需求量锐减,出现了近二十年的产业萧条. 相似文献
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《林业机械与木工设备》1978,(4)
J——25型营林履带式拖拉机是吉林省敦化林业机械厂自行研制的用于人工林和天然次生林抚育集材的新型营林履带式拖拉机。该机结构紧凑、外型尺寸小、机动灵活、爬坡能力强、越障性能好、行驶平稳、对林中树木及地表破坏小。 相似文献
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高洪斌 《林业机械与木工设备》1988,(2)
铁力林业局建设营林所共有全民和集体职364名;机械设备有 J-50集材拖拉机4台、红旗100号拖拉机1台、东方红75拖拉机1台、绞盘机1台、大中小型发电机3台、其它轮式车辆6台。这个所自1981年以来,每年除担负近3000亩整地造林、2万亩的幼林抚育及较重的育苗生 相似文献
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据国内外调查研究表明:拖拉机集材对作业区面积的破坏为5-12.54%;对幼树的损伤率为13-50%;集材后使土壤容重提高20%,大孔隙减少40%、对水份的渗透速率降低47%.为减少拖拉机集材对林地破坏和对幼树的损伤及有利森林更新,应采取如下措施:(一)拖拉机集材应安排在冬季进行;(二)在择伐伐区,拖拉机原条集材应不离道,绞集单根抽;或拖拉机原木集材,集材道间距加宽到100M,以畜力或人力将原木小集中到集材道旁;(三)在皆伐伐区,拖拉机集材也应尽可能保护幼树和保留一定株数母树;(四)采用特宽低压轮胎轮式集材机集材. 相似文献
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营林３５４Ｌ拖拉机传动轴可靠性改进设计（１５００７０）哈尔滨拖拉机厂赵俊宝（０２２６８２）内蒙古柴河林业局韩炳坤１前言３５４Ｌ拖拉机是哈拖厂１９８８年开发研制的一种产品，经过多次改进设计，该机已能较好地适应我国林区营林集材作业生产，具有机动灵活、效率... 相似文献
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《林业机械与木工设备》1982,(6)
吉林敦化林机厂研制的 JC—30型履带拖拉机,为人工林间伐、次生林择伐使用的营林集材拖拉机。该机特点是外形尺寸小,机动性好,爬坡能力强。该机可以直接进入人工林和次生林班号中作业,可以搭载2立方米原条,是一种新型的营林机械(见图)。 相似文献
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何希豪 《林业机械与木工设备》1983,(2)
合理地选择集材拖拉机的机型,对发挥机械效率,提高产量,降低生产成本以及今后集材拖拉机制造工业的发展是十分必要的。一、集材拖拉机选型的依据集材拖拉机的选型是一项比较复杂的工作。它与生产规模、伐区自然条件和森林资源情况有很大关系,同时还受到国家的投资能力及采用新技术、新工艺、新设备的技术经济效果的限制。 相似文献
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M. Peña-Claros T.S. Fredericksen A. Alarcón G.M. Blate U. Choque C. Leaño J.C. Licona B. Mostacedo W. Pariona Z. Villegas F.E. Putz 《Forest Ecology and Management》2008
Use of reduced-impact logging (RIL) techniques has repeatedly been shown to reduce damage caused by logging. Unfortunately, these techniques do not necessarily ameliorate the low growth rates of many commercial species or otherwise assure recovery of the initial volume harvested during the next cutting cycle. In this study, we analyze the effect of logging and application of additional silvicultural treatments (liana cutting and girdling of competing trees) on the growth rates on trees in general and on of future crop trees (FCTs) of 24 commercial timber species. The study was carried out in a moist tropical forest in Bolivia, where we monitored twelve 27-ha plots for 4 years. Plots received one of four treatments in which logging intensity and silvicultural treatments were varied: control (no logging); normal (reduced-impact) logging; normal logging and low-intensity silviculture; and, increased logging intensity and high-intensity silviculture. Tree growth rates increased with intensity of logging and silvicultural treatments. The growth rates of FCTs of commercial species were 50–60% higher in plots that received silvicultural treatments than in the normal logging and control plots. Responses to silvicultural treatments varied among functional groups. The largest increase in growth rates was observed in FCTs belonging to the partially shade-tolerant and the shade-tolerant groups. These results indicate that silvicultural treatments, in addition to the use of RIL techniques, are more likely to result in a higher percentage of timber volume being recovered after the first cutting cycle than RIL alone. 相似文献
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Z. Villegas M. Peña-Claros B. Mostacedo A. Alarcón J.C.Licona C. Leaño W. Pariona U. Choque 《Forest Ecology and Management》2009
Silvicultural treatments are often needed in selectively logged tropical forest to enhance the growth rates of many commercial tree species and, consequently, for recovering a larger proportion of the initial volume harvested over the next cutting cycle. The available data in the literature suggest, however, that the effect of silvicultural treatments on tree growth is smaller in dry forests than in humid forest tree species. In this study, we analyze the effect of logging and application of additional silvicultural treatments (liana cutting and girdling of competing trees) on the growth rates of future crop trees (FCTs; i.e., trees of current and potentially commercial timber species with adequate form and apparent growth potential). The study was carried out in a tropical dry forest in Bolivia where a set of 21.25-ha plots were monitored for 4 years post-logging. Plots received one of four treatments that varied in intensity of both logging and silvicultural treatments as follows: normal (reduced-impact) logging; normal logging and low-intensity silviculture; increased logging intensity and high-intensity silviculture; and, unlogged controls. The silvicultural treatments applied to FCTs involved liberation from lianas and overtopping trees. Results showed that rates of FCT stem diameter growth increased with light availability, logging intensity, and intensity of silvicultural treatments, and decrease with liana infestation degree. Growth rate increment was larger in the light and intensive silvicultural treatment (22–27%). Long-lived pioneer species showed the strongest response to intensive silviculture (50% increase) followed by total shade-tolerant species (24%) and partial shade-tolerant species (10%). While reduced-impact logging is often not sufficient to guarantee the sustainability of timber yields, application of silvicultural treatments that substantially enhanced the growth rates of FCTs will help move the management of these forests closer to the goal of sustained yield. 相似文献
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根据福建省国有林业采育场的现状,分析了目前国有林业采育场所处的发展时期以及造成国有林业采育场陷入“两危”(资源危机和经济危圉)的原因。阐述了采育场发展产业经济的必要性。并在此基础上对企业的发展提出几点对策。 相似文献
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This paper presents a case of planting and management of natural regeneration of shihuahuaco (Dipteryx spp.) by recent migrants in a Peruvian Amazonian logging frontier. We interviewed residents of three communities of smallholders in Irazola District, Province of Padre Abad, Region of Ucayali, located within the historic and actual boundaries of an active logging concession, and conducted growth studies of shihuahuaco trees planted in two mixed-species agroforestry fields, over a period of 3 years. We found that the majority of landholders were managing the natural regeneration of valuable hardwood timber trees, and planting seedlings on their lands. Growth of shihuahuaco trees in agroforestry fields was comparable to growth rates in managed silvicultural plantations, which suggests the potential for local smallholders activities to contribute to conservation of genetic stock and eventual renewal of populations depleted by logging. We recommend greater recognition and inclusion of local people, with their innovative and productive silvicultural practices, in efforts to remediate the impacts of selective logging of high-value timber species. 相似文献
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设计了一种基于三菱PLC控制的机械手,并将其应用于集材拖拉机的林木装卸作业.给出了系统总体设计框架. 相似文献
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多功能轮式集材拖拉机搭载板装置的设计研究 总被引：1，自引：0，他引：1
通过对我国集材拖拉机发展沿革及目前林业生产作业条件分析,研发一种新型多功能集材拖拉机对目前林业生产具有重要意义.集材装置是集材拖拉机最具有特点的主要工作装置,本文对多功能轮式集材拖拉机集材装置（搭载板装置）整体结构进行设计.首先根据集材拖拉机趟载量要求确定搭载板整体结构尺寸,宽度为1 050 mm,长度为1 219 mm,厚度为20 mm.其次对搭载板辅助结构进行设计计算,使用Solid Works三维绘图软件建立搭载板的3D模型.最后基于有限元校核搭载板的强度,得到搭载板在最大压力载荷下的位移云图和应力云图,结果表明所设计的搭载板满足强度要求. 相似文献
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本文从营林业、采运业、林产工业的生产力水平和林地的实物生产率等方面阐述福建林业生产力水平，分析制约林业生产力发展的因素，据此提出发展对策。 相似文献