共查询到20条相似文献，搜索用时 109 毫秒
1.
森林调查新技术——“3S”集成技术 总被引：1，自引：0，他引：1
１“３S”集成技术“３S”技术指GPS（全球定位系统）、RS（遥感技术）、GIS（地理信息系统）及其集成技术，三者紧密结合构成一个对地观测、处理分析、制图系统。GIS、GPS、RS的结合与集成是从整体上解决空间对地观测的理想手段，“３S”及集成技术是当今国内外地学界高新技术之一。１．１GPS即所谓的“授时与测距系统／全球定位系统（NavigationsystemTimingandRanging／Globalpasitionsystem－NAVTAK／GPS）通称全球定位系统。GPS定位特点：①全球地面连续覆盖；２４颗均匀分布的卫星保证地面上任何地点、任何时刻最少可… 相似文献
2.
GPS是全球定位系统的简称。简要阐述了GPS技术的概念和特点,详细介绍了GPS在森林资源连续清查、林地管理、作业设计和检查验收等林业工作中的应用,以及GPS在毁林案件勘察、森林防火、病虫害防治中的应用。 相似文献
3.
GPS是导航卫星测时和测距/全球定位系统的简称.全球地面连续覆盖,全天候实时、动态导航、定位,其技术应用已经很广泛,在生态建设中的应用发展也很快,实时定位速度快,操作简单,观测简便. 相似文献
4.
《中国林业》2006,(16)
GPS(又叫NAVSTAR/GPS)是英文NavigationSystemwithTimeAndRangang/GlobalPositioningSystem的缩写。是美国军方耗资100亿美元,以军用为目的的于1973年开始开发布设的卫星定位、导航网络系统。但随时间的推移,GPS全球定位系统已经突破了军用的范畴,变成了一种人人可用的资源。任何人只要拥有GPS的接收机,无论何时何地都可以无偿地利用。自20世纪80年代开始,国内外广泛开展GPS应用方法研究和应用探索,目前我国测绘局、铁道部、交通部、能源部、煤炭部、建设部、农业部系统及城市的测绘、勘察设计、规划和市政等部门的众多单位都已… 相似文献
5.
阐述了开发使用比全站仪更为灵活的车载GPS/IMU(全球定位系统/惯性导航系统)结合地面型三维激光扫描仪,在地面三维形状测量的应用,并就系统构成,数据解析、检证、量测精度等进行了探讨。 相似文献
6.
GPS全球定位系统是美国研制并在1994年投入使用的卫星导航与定位系统,其应用技术已遍及国内外的各个领域。在测量领域GPS系统已广泛用于大地测量、工程测量、航空投影测量以及地形测量等方面。 相似文献
7.
GPS功能及其在水土保持中的应用 总被引：4，自引：0，他引：4
全球定位系统GPS具有路标、路线、方向、速度、导向、追踪、计算机上/下载数据和地图等功能，在水土保持综合调查、水土保持工程规划设计、水土流失动态监测和水土保持工程验收中具有广泛的用途，随着RS和GIS集成技术的深化，GPS在水土保持中的应用将更加广泛和深入。 相似文献
8.
近年来,随着遥感、全球定位系统、地理信息系统（即3S技术）的迅猛发展,3S技术在林业资源管理、规划设计、工程管理、荒漠化监测、沙化监测等各方面得到了广泛的应用.特别是地理信息系统和全球定位系统,因其高效、快捷、准确性高等特点更是备受欢迎.GPS定位测量已经大部分取代了罗盘测量,尤其是在图斑面积测量过程中.但如何利用GPS测量坐标数据快速便捷的形成地理图斑、自动完成面积计算值得考虑.下面以信息系统MAPINFO作为平台讨论GPS数据的成图过程. 相似文献
9.
１GPS概述GPS，其含义为“卫星测时和测距导航全球定位系统”，通称全球定位系统，是２０世纪７０年代由美国陆海空三军联合研制的新一代卫星导航定位系统。其主要目的是为陆、海、空三大领域提供实时、全天候和全球性的导航服务，为用户连续提供精确的位置、速度和时间的信息，从根本上解决了人类在地球上的导航和定位问题。随着科技的不断发展，GPS技术越来越多地运用到社会的各行各业。１．１GPS的主要特点及用途GPS的主要特点有３个：一是全球地面连续覆盖。２４颗均匀分布的卫星保证地面上任何地点、任何时刻最少可以接受４颗以… 相似文献
10.
11.
Jean-François Bissonnette Jérôme Dupras Frédérik Doyon Clément Chion Jonathan Tardif 《Small-Scale Forestry》2017,16(3):367-393
A study on the perception of vulnerability and adaptive capacity to climate change (CC) was realised among 27 small private forest owners (SPFOs) of a region in southern Quebec. In-depth semi-structured interviews were conducted with SPFOs of diverse profiles to better understand their perception of environmental disturbances and their needs to improve forest management in relation to global change and more precisely to CC. The main purpose of the research was to better understand whether perceptions of vulnerability and adaptive capacity to CC can constitute a barrier to proactive actions toward adaptation. Qualitative data shows a spectrum of attitudes and perceptions which highlight how SPFOs identify different potential and actual disturbances and assess the risk they represent for their forest-based activities. It shows how place-based experiences of environmental disturbances shape perceptions of vulnerability and capacity to adapt to disturbances. Factors such as access to financial resources and perceived resilience of forest ecosystem influence perceived adaptive capacity. Most SPFOs who participated in the research do not perceive their forest or forest-based activities to be vulnerable to CC, which may constitute a barrier to proactive adaptation to CC. The awareness of CC as a general phenomenon does necessarily translate into adaptation in forestry practices. Yet, many participants expressed a need for better access to knowledge and financial support to improve adaptive capacities to CC and broader environmental or economic stressors. 相似文献
12.
安徽板栗产销状况及发展前景与对策探讨 总被引：1，自引：3，他引：1
安徽省是全国板栗的主产区之一。近十多年来。我省板栗在面积和产量上有了大幅度的提高。产销两旺。但要做到未雨绸缨,控制规模,提高现有板栗林的单位面积产量和效益．必须加快推广先进技术。加快鼠种推广步伐。调整品种结构。大力发展贮藏和深加工,积极创建品牌,建立营销体系。开拓市场销路，提高我省板栗在国内、国际市场上的竞争力,提高经济效益。 相似文献
13.
CHEN Peng ZHAO Guangjie College of Material Science Technology Beijing Forestry University Beijing P.R.China 《中国林业科技(英文版)》2007,(2)
There are many advantages of bended wood,such as good-looking shape,simple process and low cost.The product,however,is easy to get recovery,which is urgent to be dealt with.This paper concludes the features of deformation and recovery of bended wood and wood-based composites and summarizes four treating methods to keep dimensional stability.Compared to bended solid wood,some elementary perspectives on the research of bended wood-based composites are presented.The purpose of this paper is to suggest:1)to investigate the optimum heating time and temperature that bended wood and wood-based composites need from the formation of deformation to the recovery and to the permanent fixation,according to its changes of dimensional stability such as curvature radius;2)to measure the composites comprised of wood and adhesives on the changes of stress relaxation,dynamic viscoelasticity and crystal1ization field;3)to quantitatively analyze changes of the major components in wood cell wall polymers as well as the composites under heat/steam treatment and untreated conditions.It will be helpful for subsequent research to clarify on the mechanisms of permanent fixation of bended wood and also contribute to that of wood-based composites. 相似文献
14.
如何利用自身优势,加快构筑黑龙江省森工对俄林业经济合作的新格局,是黑龙江省森工目前亟待解决的问题。笔者结合黑龙江省森工对俄合作的现状,从诸多方面论述了现存的基础优势及俄方战略调整带来的新机遇,都为构筑新格局提供了可行的条件和保证;阐明了森工行业要想与俄构筑合作新格局就必须向开放型经济升级;并提出了面临新形势、新发展的新要求和总体设想,为实现森工又好又快发展,探索出新的发展方向。 相似文献
15.
The 10th North American Forest Soils Conference was held in Sault Ste. Marie, Canada, 20–24 July 2003. These conferences, held at 5-year intervals since 1958, are intended to provide a forum to discuss and summarize the state of knowledge on selected topics related to forest soils. Approximately 60 papers were presented on a variety of topics related to understanding and managing soils that support forests with particular emphasis given to field research, soil carbon, and site management/classification. We discuss the topics of this conference in relation to earlier ones and conclude that advances are made unevenly and that there is a need for new approaches to investigating many of the topics. We note the change in forest management that has occurred since the first of these conferences and the resulting changes needed in our approach to research and management. The need for interaction of scientists and clientele groups is noted as necessary for development of sound management and research policy. The interaction of scientific disciplines is needed to attack problems that have been difficult to elucidate. The challenge to forest soil scientists is to mesh their scientific interests with the needs of society to obtain the resources needed to advance science and provide information that will improve forest management. 相似文献
16.
福建毛竹林生态培育与生态系统管理 总被引：6，自引：0，他引：6
针对福建毛竹林经营中存在的生态经济问题,提出毛竹林生态培育和生态系统管理的经营理念,旨在改变不合理的管理措施,因山因林制宜,切忌推广一种固定的经营模式.重建竹林生态系统的优化结构与功能体系,增加物种多样性,增强系统的自我调控能力,促进生物良性循环,提高竹林的抗逆性,确保毛竹林丰产、稳产,提高生态经济效益. 相似文献
17.
林木低磷胁迫适应机制研究进展 总被引：3，自引：0，他引：3
土壤有效磷缺乏在自然环境中是一种非常普遍的现象,近年来世界各国针对植物的觅磷和耐磷机制进行了大量研究,然而目前相关的综述性报道多限于农作物,对林木低磷胁迫适应性的综述性报道尚不多见。在长期进化过程中,林木为利用土壤中现有的含量极低的有效磷,形成了各种适应低磷胁迫的机制。文中从林木根系的形态学变化、根系分泌物对土壤难溶性磷的活化作用、林木对土壤低浓度有效磷的吸收利用以及应对低磷胁迫的遗传调控等方面综述了低磷环境中林木的适应机制,为揭示林木对缺磷环境的适应机理、发掘林木自身对土壤有效磷高效率的吸收利用能力、以及进一步筛选林木的磷高效品种和合理经营管理人工林提供参考。 相似文献
18.
The forest industry continues to be men dominated, dependent on forest owners' supply of raw material and of significant importance to the national and local economy and economic development in Sweden. The interconnection between masculinity and the work, knowledge, forest owners and professionals in the sector contributes to exclusion of women. In response to this, women forest owners have formed networks in different local areas. Through focus group interviews, this study examined the strategies, functions and positions of these networks, both in their individual locations and the overall policy processes of gender mainstreaming of the sector, to scrutinise the reproduction of gender inequities and the gendered notion of forestry. The results show how the networks are acting to expand the discursive space, establish alternative publics and empower their members by inventing and circulating counterdiscourses. The different strategies adopted by the networks appear to have emerged in response to contemporary political processes. The conclusion is that one single public sphere cannot encompass the diversity of the contemporary forestry sector, indicating a need to contain a multiplicity of publics, both to challenge the modes of deliberation that mask domination and to facilitate transformative processes. 相似文献
19.
This paper examines seedling production systems for small-scale forestry in northern Mindanao, particularly the constraints and opportunities to sustain the operation of smallholder nurseries. Various types of nurseries were identified to examine issues and concerns operators face, and data collected through a survey of nursery operators, discussion with government and NGO personnel, and literature review. Many smallholders in northern Mindanao have been engaged in seedling production, for farm needs and sale in local markets. The interest of smallholder to sustain seedling production depends on market demand and incentives, which translates to financial benefit on sound nursery practices and of reliable access to profitable markets. Activities that will assist smallholder nurseries to achieve full potential have been identified as: available nursery technologies to produce high quality planting materials in sufficient quantity; building farmer groups to facilitate seedling production and enhance the scale of product marketing; building partnerships with various service providers and other stakeholders to address technical, institutional, marketing and policy issues that may hamper the operation of smallholder nurseries; access to markets and market information; and provision of incentives and policy support. Associated benefits from small-scale seedling production accrue to the government, wood processors and to the public in general. 相似文献
20.
Guangyu Wang Tongli Wang Haijun Kang Shari Mang Brianne Riehl Brad Seely Shirong Liu Futao Guo Qinglin Li John L. Innes 《林业研究》2016,27(3):469-488
Climate change is a threat to the stability and productivity of forest ecosystems throughout the Asia-Pacific region. The loss of forests due to climate-induced stress will have extensive adverse impacts on biodiversity and an array of ecosystem services that are essential for the maintenance of local economies and public health. Despite their importance, there is a lack of decision-support tools required to evaluate the potential effects of climate change on Asia-Pacific ecosystems and economies and to aid in the development of regionally appropriate adaptation and mitigation strategies. The project Adaptation of Asia-Pacific Forests to Climate Change, summarized herein, aims to address this lack of knowledge and tools and to provide support for regional managers to develop effective policy to increase the adaptive capacity of Asia-Pacific forest ecosystems. This objective has been achieved through the following activities: (1) development of a high-resolution climate downscaling model, ClimateAP, applicable to any location in the region; (2) development of climate niche models to evaluate how climate change might affect the distribution of suitable climatic conditions for regionally important tree species; (3) development and application of forest models to assess alternative management strategies in the context of management objectives and the projected impacts of climate change; (4) evaluation of models to assess forest fire risk and the relationship between forest fire and climate change; (5) development of a technique to assess ecosystem carbon storage using LiDAR; and (6) evaluation of how vegetation dynamics respond to climate change using remote sensing technology. All project outputs were developed with a focus on communication and extension to facilitate the dissemination of results to regional forest resource managers to support the development of effective mitigation and adaptation policy. 相似文献