黄山市森林资源变化状况及对策

森林资源是林业的物质基础。其消长变化直接反映出一个地区的林业工作成效。1992年黄山市完成了森林资源清查,笔者将本次清查成果与1985年清查成果相比较,对全市森林资源消长变化进行分析,结合现有森林资源的特点,提出我市今后的林业发展     

基于迪庆州30年活立木蓄积变化的研究

迪庆州生物资源丰富,是云南省重点林区之一。基于此,本研究收集处理了迪庆州1987-2017年7次森林资源连续清查的数据,计算出每次森林资源连续清查的活立木蓄积及森林资源消耗蓄积,对全州30年间活立木蓄积变化进行分析研究,籍此分析出迪庆州森林资源的特点及变化情况。     

河源市源城区森林资源变化分析与发展建议

以广东省河源市源城区2001、2009年两个年度森林资源连续清查数据为研究对象,分别从林地面积、林种、树种、龄组等方面对该区8年间森林资源变化动态进行了分析与评价,并对源城区林业的发展提出建议.     

黄显阳:按时优质完成连清复查

<正>2015年10月12日,林业厅厅长、党组书记黄显阳在广西现代林业科技示范园检查国家森林资源连续清查广西第九次复查工作时强调,要按时优质完成连清复查。他指出,开展连清复查是取得全区森林资源数量、质量、生态状况等主要指标数据的唯一途径。此次连清复查就是要查清全区森林资源数量和质量,了解2010至2015年间森林资源消长变化动态及其变化原因,掌握森林生态状况和变化趋势,分析评价林业和生态建设成效,为国家和自治区制订和调整林业方针     

山西省森林资源发展趋势预测

以山西省1984年至2000年间的森林资源连续清查数据为依据，应用灰色系统理论建立了山西省森林资源预测模型，预测了2005年至2015年森林资源主要指标的发展趋势。为山西省制定林业宏观决策，编制林业发展规划和森林经营管理提供科学依据。     

一类清查中寻找样地方法浅谈

森林资源连续清查(俗称"一类清查")作为林业和生态建设的基础工作,是发展现代林业,建设生态文明的支撑和保障,其目的是掌握宏观森林资源现状与消长变化动态,准确把握森林生态系统的变化趋势和规律,综合评价森林资源质量与生态状况,为掌握宏观森林资源现状与动态提供依据,对于科学把握林业发展形势、适时调整林业建设政策和措施、促进林业可持续发展发挥重要作用.     

CFI世界瞩目国外森林资源连续清查状况简述

“清查”一词,不论在英语(inventory)德语(inventur)还是俄语中都与商业“盘点”的含义相同。“连续”则是指一个时间概念,强调清查是“定期”和“不断”进行的。因此,森林资源连续清查从广义上讲就是每隔一定时间对森林资源进行“盘点”。以便了解森林资源的现状和间隔期内的变化,为分析全国森林资源动态,制定国家林业方针,开展林业经营利用活动,控制和指导全国林业发展,提供必要的基础数据。     

瑞典全国森林资源清查新方案

<正> 随着林业和森林资源清查技术的发展,瑞典拟定从1983年起实施新的全国森林资源清查方案。与此同时,还开展了五个课题的研究: 1.数据的获取;2.抽样设计;3.量测与记录方法;4.数据处理;5.可行性研究。瑞典的第一次全国森林资源清查在1922—1929年间完成,到1973年,已进行了4次全国     

建立量算面积管理系统的建议

建国以来我省林业调查工作取得了很大成绩。全省在普遍进行森林资源二类调查和森林资源清查的基础上,建立了森林资源档案和森林资源连续清查体系,为全省林业生产建设提供了科学依据。但当前森林资源调查工作中还存在着调查一次一个面积,资源统计年报也经常发生变化(已排除变化因素)缺乏系统性,稳定性。为了防止上述弊病,建议建立量算面积管理系统。     

总结经验 再接再厉 努力提升森林资源连续清查水平

森林资源连续清查是依法监测全国森林资源消长和生态状况变化的林业基础性工作,其成果是制定和调整经济社会发展规划和林业生态建设方针政策的重要依据。我国已经完成六次全国森林资源连续清查,积累的许多经验值得总结,更要适应生态建设的需要,进一步加以保持和发扬,并提升到新的水平。     

甘肃省森林资源结构特征分析

森林资源连续清查(简称一类清查)是国家级的森林资源监测工作,其成果是国家最权威的林业基础数据。根据2006年甘肃省第六次森林资源连续清查结果,从权属构成、起源构成和乔木林结构特征、竹林及特灌林等方面对甘肃省森林资源结构特征进行了分析。     

1977-2005年广西森林资源变化动态评价

依据广西1977、1985、1995和2005年4次森林资源连续清查资料,从土地利用结构、林分蓄积量结构、林种结构、龄组结构角度分析了广西森林资源的现状,并结合30年来广西林业生态建设的重大活动分析评价了前后期广西森林资源数量、质量和结构的动态变化。经过近30年的努力,广西森林覆盖率增长了135.73%,森林蓄积量增长了125.66%,无林地面积减少了74.18%,森林资源结构得到改善,质量有所提高,森林生态服务功能得到加强,林业基础产业地位得到巩固。最后指出了广西森林资源经营管理存在的问题。     

恩施州森林资源动态变化分析

为合理地评价和经营恩施州森林资源,依据1985,1994,1999和2006年4次森林资源调查资料,并结合20年来恩施州林业生态建设的重大活动情况,从森林面积、蓄积量、组成结构、质量等角度对森林资源动态变化进行分析。经过20年来的努力,恩施州森林面积、蓄积量和覆盖率有了很大的提高,全州现有林业用地面积160.20万hm2,其中森林面积113.41万hm2,活立木蓄积量5 000.13万m3,森林覆盖率67.02%,有林地面积年均增长率为3.11%,无林地面积年均净减率为4.61%,防护林、特用林、经济林面积年均净增率分别为38.55%、20.88%、2.91%,用材林面积年均净减率为1.21%,森林资源结构得到改善,质量有所提高。最后揭示资源变化的原因与内在联系,提出资源管理与发展方向,为制定林业的可持续发展方针提供科学决策依据。     

利用开源软件开发基于WebGIS的县级林业空间信息共享系统

定期的森林资源调查和遥感技术、全球定位系统技术等在林业中的广泛应用,积累了大量的林业空间数据.充分利用这些宝贵的空间数据信息,为国家的经济发展和生态建设服务已经成为当务之急.结合林业生产经营管理的需求,一些部门、单位基于资金和技术等情况采用了不同的地理信息系统(GIS)软件,开发了各自的单机版森林资源管理信息系统.     

Generalized functions of biomass expansion factors for conifers and broadleaved by stand age,growing stock and site index

Parties to the Kyoto Protocol and/or the United Nations Framework Convention on Climate Change (UNFCCC) are required to account for their direct human-induced carbon emissions and removals including those from forestry and other land use related activities. In most European countries, the forestry related greenhouse gas inventories are largely or exclusively based on converting tree volume data from national forest inventories to biomass using biomass conversion and expansion factors (BCEFs). However, country specific data for many species are often lacking, which considerably increases the uncertainties of the greenhouse gas inventories. The focus of this research was to develop, using internationally published datasets that cover a large geographical area, an extended set of generalized curves of such biomass expansion factors for several species or species groups by age, growing stock and site index.     

Three stories under the same hut: Market preferences and forest governance drive the evolution of tourism construction materials

Forest resource extraction evolves with commodification and shifts in product use and demand. Tourism is a major economic sector that represents approximately 10% of the global GDP and has the potential to drive major changes in forest activities. In the last three decades the boom of coastal tourism created new markets for the emergent community forestry sector in Quintana Roo (SE Mexico). Employing ethnobotanical and archival research methods we analyzed the evolution of management and use of three distinct forest products used in tourism architecture: polewood, thatching materials and chicozapote tree (Manilkara zapota) posts. Current models explain processes of forest product substitution and management intensification either in terms of economic efficiency and resource depletion, or power differences. Our results suggest the need to expand our understanding of extractive cycles to explicitly incorporate multi-scale governance, shifting values, and external shocks (i.e., hurricanes) as major drivers of change of forest products.     

红河州森林资源动态变化分析及管理对策

以红河州2003和2008年2次森林资源连续复查成果数据为依据,对5年间森林资源动态变化进行统计分析.结果表明,有林地净增17.7%;活立木总蓄积量净增9.5%.对5年间森林资源消长变化原因进行分析,提出深化森林分类经营措施,改革林业发展模式,加大林政执法力度等管理对策.     

A century of logging and forestry in a reindeer herding area in northern Sweden

Boreal forest ecosystems are generally highly sensitive to logging and other forestry activities. Thus, commercial forestry has had major effects on the forests and landscape structure in northern Sweden since the middle of the 19th Century, when it rapidly extended across the region. Lichens (which constitute up to 80% of reindeer forage in winter and early spring) have often been amongst the most severely affected ecosystem components. The overall aim of the present study was to analyze how forestry has influenced the potential supply of ground-growing lichens as winter forage for the reindeer in this region over the past ca. 100 years. For this purpose, we analysed changes in forest and stand structure in Scots pine-dominated (Pinus sylvestris L.) reindeer wintering areas in the southern part of the county Norrbotten (covering ca. 58,000 ha) using detailed historical forest inventories and management plans. We found that the amount of the forest types considered potentially good pasture (mainly middle-aged and old pine forests) decreased during the first part of the 20th Century. However, the quality of grazing grounds was improved by forestry during this time mainly because selective logging made the forests more open which benefits lichen growth. During the last part of the 20th century forestry impaired the quality of grazing grounds in several ways, e.g. by clear-cutting and intensified use of various silvicultural measures. We conclude that ca. 30–50% of the winter grazing grounds have been lost in the study area because of intensive forest management during the last century. The spatially precise historical information about the affects of forestry on lichen pasture provided in this study can be used to direct forest management which will facilitate and promote reindeer herding in the future.     

Carbon pools and fluxes in small temperate forest landscapes: Variability and implications for sampling design

Assessing forest carbon storage and cycling over large areas is a growing challenge that is complicated by the inherent heterogeneity of forest systems. Field measurements must be conducted and analyzed appropriately to generate precise estimates at scales large enough for mapping or comparison with remote sensing data. In this study we examined spatial variability in three small temperate forest landscapes. Our objectives were (1) to quantify the magnitude and scale of variability in stand structure, carbon pools and carbon fluxes and (2) to assess how this variability influences both optimal sampling strategy and required sampling intensity. Stand structure was consistently less variable than carbon pools or fluxes, suggesting that measuring carbon dynamics may require more intense sampling than traditional forestry inventories. Likewise, the magnitude of variability differed substantially among response variables, implying that sampling efficiency can be enhanced by adopting a flexible sampling strategy that is optimized for each carbon pool. Our results indicate that plots dispersed across the study area are generally more effective than clustered plots for characterizing carbon dynamics.