共查询到20条相似文献,搜索用时 140 毫秒
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自1982年全国森林资源调查和管理工作会议以来,南方各省重点林区县(市)陆续开展了森林资源规划设计调查(即二类调查)工作。福建省三明地区永安市1985年结合县(市)级连续清查体系的建立(一类初查),首次开展了森林资源二类调查;1990年对县(市)级连续清查体系设置的固定祥地进行了第一次复查;1996年进行了第rt次森林资源规划设计调查,同时对市级“连清”体系固定祥地进行了第二次复查。本次二类调查按照1996年4月审定通过的“福建省森林资源规划设计调查和森林经营方案编制技术规定”执行,调查方法采用抽样控制总体法,即以县… 相似文献
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浅论小班在森林资源管理中的作用 总被引:2,自引:0,他引:2
浅论小班在森林资源管理中的作用张明森林档案是森林资源管理的重要内容,全省各地以林业局或林场为单位。采用森林资源调查(二类调查)成果,陆续建档。二类调查资源数据只能反映当时的森林资源结构和数量,森林资源消长变化,森林档案数据更新,是森林资源管理的基本... 相似文献
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1森林资源规划设计调查的目的和任务
森林资源规划设计调查(以下简称二类调查)以10年为一个经理期,其主要目的是:依据《森林法实施条例》有关条款规定“应定期进行检测全国森林资源消长动态和森林生态环境变化状况”,查清、查实森林资源,掌握人为自然因素引起的森林资源消长变化规律。其成果是编制和实施森林经营方案、 相似文献
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通过对1997年“二类调查”与1987年“二类调查”森林资源的数据变化进行分析,针对我县森林资源特点,对我县森林可持续发展的途径进行探索,以保护和发展森林资源。 相似文献
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森林资源二类调查建档和统计系统软件的研究陈德铭,唐威,鲍爽(四川省林业勘察设计研究院二大队)开展森林资源二类调查,建立森林资源档案,实现森林资源动态管理是编制和调整森林经营方案,搞好林业规划设计,制定林业生产计划,推进林木资产化管理,实现林业持续发展... 相似文献
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森林资源规划设计调查(简称二类调查)可谓林业工作中的一个重大项目工程。该项工作自幼年代开展以来,为实现我国森林资源的科学管理、合理经营和永续利用作出了重大贡献。根据国家林业局森林资源规划设计调查周期一般为10年的规定以及编制“十五”森林采伐限额的要求,今明两年又将是林业各经营单位再次开展二类调查的“旺季”。在当前林业推行资产化管理、实行森林资源分类经营的新形势下,二类调查同时还肩负了提供基础数据的使命。因此,探讨当前二类调查存在的问题及其对策,对于总结经验,不断完善调查技术规程和规范质量管理体系,… 相似文献
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以钦南区2009年森林资源二类调查数据为对象,从林地面积、森林蓄积等方面对森林资源进行动态变化分析。从森林资源分布、森林覆盖率、森林结构、森林质量等方面详细地评价了钦南区森林资源状况,并针对森林资源管理方面提出建议。 相似文献
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文章以 1991年大杨树林业局森林资源二类调查成果材料及 1999年大杨树林业局森林资源二类补充调查成果材料为依据 ,分析大杨树林业局森林面积、蓄积变化 ,提出经营建议 相似文献
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流溪河林场森林资源调查与分析 总被引:1,自引:1,他引:0
通过二类资源清查数据,分别从林地面积、林种、树种、龄组等方面对流溪河林场森林资源动态变化进行了分析和评价,并对林杨林业的发展提出建议。 相似文献
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江苏省森林资源现状与特点分析 总被引:1,自引:0,他引:1
森林资源二类调查是获取各基层单位森林资源现状与分布的主要方法,根据江苏省2009年森林资源二类调查结果,笔者通过提取各类林地、林木、林种、乔木林、竹林和灌木林的组成及分布等森林资源主要数据,并对单位面积蓄积、单位面积株数和树种结构等因子进行了对比分析,客观地反映了江苏森林资源快速增加、幼中龄林占优势地位、非公有制林业快... 相似文献
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A special mobile GIS(Geographic Information System) system used for forest resources second-class inventory was developed on the basis of traditional forest resources inventory,remote sensing,GPS(Globe Positioning System) and embedded technology.Portable instrument,embedded development and the integration technology of RS(Remote Sensing),GIS and GPS are all used in this special mobile GIS system.Further,the system composition,key techniques,and current situation of the practical application in China were analyzed in the study.The results are important for applying modern high-tech for the planning and design of digital forest resources to improve the precision and efficiency of inventory and reduce the labor cost and financial investment. 相似文献
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Aerial photographs arc important information sources for forest inventory. With the development of science and technology,
an automated approach to aerial photograph interpretation has been sought. This paper introduces an experimental computer
system for the auto-interpretation of aerial photographs. On thebasis of the experimental system, several algorithms are developed for the interpretation of density, crown closure, working groups and
species composition of forest stands. Experiments show that auto—interpretation works well for some forest inventory data. 相似文献
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Diversity and composition of tropical secondary forests recovering from large-scale clearing: results from the 1990 inventory in Puerto Rico 总被引:10,自引:0,他引:10
The extensive recovery from agricultural clearing of Puerto Rican forests over the past half-century provides a good opportunity to study tropical forest recovery on a landscape scale. Using ordination and regression techniques, we analyzed forest inventory data from across Puerto Rico’s moist and wet secondary forests to evaluate their species composition and whether the landscape structure of older forest affected tree species composition of recovering forests at this scale. Our results support conclusions from studies conducted in Puerto Rico at smaller scales and temperate forests at larger scales that timing of abandonment and land use history are of overwhelming importance in determining the species composition of recovering forests. Forest recovery is recent enough in Puerto Rico that previous land use is clearly evident in current species composition, and creates new forest communities. As demonstrated in other work, physical factors such as elevation and substrate co-vary with land use history, so that the species composition of the forest landscape results from the interplay between biophysical and socioeconomic forces over time. Our results also indicate that increasing the distance to the largest forest patches occurring in the landscape 12 years previous had a small negative impact on species richness but not species diversity or community composition. We conclude that land use history has as much influence in species composition as biophysical variables and that, at the scale of this study, there is no large influence of forest landscape structure on species diversity or composition. 相似文献
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GPS eTrex在森林资源监测中的应用 总被引:4,自引:0,他引:4
概述了GPS eTrex手持式全球卫星定位仪的工作原理、性能、坐标系统的转换及校正。详述其在森林资源调查、规划及监测中的应用。利用2002年度云南省森林资源连续清查的成果,对采用GPS eTrex全球卫星定位仪与常规“连清”方法进行对比分析。提出了今后森林资源监测工作的建议。 相似文献
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《Scandinavian Journal of Forest Research》2012,27(3):262-272
Abstract An airborne laser scanning (ALS) dominant height model was developed based on data from a national scanning survey with the aim of developing a digital terrain model (DTM) for Denmark. Data obtained in the ongoing Danish national forest inventory (NFI) were used as reference data. The data comprised a total of 2072 measurements of dominant height on NFI sample plots inventoried in 2006–2007 and their corresponding ALS data. The dominant height model included four variables derived from the ALS point cloud distribution. The variables were related to canopy height, canopy density and species composition on individual plots. The RMSE of the final model was 2.25 m and the model explained 93.9% of the variation (R 2). The model was successful in predicting dominant height across a wide range of forest tree species, stand heights, stand densities, canopy cover and growing conditions. The study demonstrated how low-density ALS data obtained in a survey not specifically aimed at forest applications may be used for obtaining biophysical forest properties such as dominant height, thereby reducing the overall forest inventory costs. 相似文献
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森林资源连续清查简介 总被引:1,自引:0,他引:1
论述了森林资源的重要性及森林资源连续清查的意义及内涵;并介绍了按照2003年国家林业局发布的《国家森林资源连续清查技术规定》,森林资源连续清查的主要调查内容。 相似文献