共查询到19条相似文献,搜索用时 296 毫秒
1.
自然资源管理具有数据量大,数据种类多,数据之间包溶性强的特点。采用何种数据库技术才能适应这些特点,使资源管理行为回归到以数据库为中心的管理模式,本文为此提出了“无边界可溶数据库技术”。通过对两个县长江防护林工程信息管理系统建立近60万个数据的数据库技术处理过程证明,“无边界可溶数据库技术”对于资源管理实践有很大的指导作用,对于决策分析有不可替代的地位。 相似文献
2.
3.
“无边界可溶数据库技术”只有经过实践才有存在的价值,为此本文从应用的角度,将无边界可溶数据库技术的基本规划和操作方法进一步具体化,资源管理技术人员通过基本的计算机技术培训之后,可以按本文的方法进行不分级别的数据库管理,从而达到促进技术创新与生产实践的结合。 相似文献
4.
通过分析息峰、修文两县建立长防林信息管理系统的信息数据特产和可持续发展、景观生态学理论与方法对长防林管理的影响,在无边界可溶数据库技术和现有计算机技术基础上,结合建立辅助调查系统和运用图形图象处理技术,形成数据集成化采集方案. 相似文献
5.
数据库是较为理想的数据存储和管理方式.它具有处理速度快,安全可靠,节约空间,便于修改,易实现数据共享等特点.林木种质资源管理数据信息按照描述方式和记录方式分为两大类:一类是描述事物属性特征,以数字或文字方式记载的数据信息,如树高、胸径等;另一类是描述事物的空间位置及分布,以图形方式记载的数据信息,如优树的照片、地理分布、立地类型区划等.由此可得出,完整的林木种质资源数据库包括两大类,即属性数据库和空间数据库. 相似文献
6.
以第三次全国土地调查为契机和基础,融合对接现有森林资源管理“一张图”数据成果,形成高集成通用的一张数据底图。“三调”与“一张图”数据由于影像底图、分类标准、边界、空间位置及其他因素不一致导致数据存在差异,数据融合对接工作难度大。目前,“三调”与“一张图”的数据融合技术方法主要为分类标准的统一、内业标准的统一、外业补充调查的校正、数据库建设的统一等。研究国土“三调”与森林资源管理“一张图”数据融合方法,对着力提升森林资源保护发展水平以及建设自然资源“一张图”具有重要意义。 相似文献
7.
以海量林业资源数据为研究对象,论述了基于福建省林业政务信息网络环境的全省林业资源数据GIS组织的技术方法和实现过程。通过分析海量林业资源数据的特点,探讨了GIS系统组织结构、空间数据预处理及加载、数据无缝与多尺度管理、ArcSDE空间数据库、空间数据库设计与配置、数据交换等关键技术。应用结果表明,所建立的数据仓库在网络上能够方便、快速地被客户端所调用,满足了全省林业资源数据管理的需要。 相似文献
8.
9.
10.
11.
云南省嵩明竹子科技园的建立 总被引:1,自引:1,他引:0
竹子科技园建设是七彩云南、多彩昆明建设的重要组成部分。竹子科技园是一种科技入户的新型模式,对于我国保护竹类的多样性、大力开发民族竹文化资源、推进竹子生态产业化、发展特色竹产业具有重要意义。文章阐述了云南省昆明市嵩明县竹子科技园的建设过程,包括科技园的建设原则和建设内容,分析了科技园的成本与效益。文章认为,嵩明县竹子科技园作为云南省全面发掘少数民族竹文化和开发竹产业的先导工程之一,具有较高的科学价值、广阔的发展前景和深远的历史意义,可为其他地区竹科技园的建设提供借鉴。 相似文献
12.
13.
LiuCan 《中国林学(英文版)》2004,6(3):20-27
Using a multi-input multi-output production technology and survey data from Jinzhai County, western Anhui Province, China, the author first measured the production performance of rural households -- their efficiency, economy of scale, and productivity during 1978-1997, and then related the measured production performance with institutional change, market access, and other factors. Preliminary results show that: 1) performance differs a great deal across households and over time; 2) institutional changes and market accessibility have played a major role in improving performance; 3) depending on the specific resources, their effects are variable. 相似文献
14.
为查清云南省宁蒗县森林资源情况,满足其森林资源管理、林业发展和生态建设需要,利用“3s”技术和小班调查、样地调查、低产林调查、消耗量调查等方法,查清各类土地面积和各类森林蓄积、林木和林地资源的种类、数量、质量,落实森林分类经营区划.分析森林资源消长变化情况,根据森林资源现状和特点,提出加强石漠化治理和编制林业发展规划等林业发展建议,为今后全县森林资源的科学经营与管理、制定林业发展规划提供基础数据,也为今后实行森林生态效益补偿和森林资源资产化管理提供重要依据. 相似文献
15.
16.
Silviculture, forest conversion and technical tools of ecosystem management, such as forest liming, display their effects at the landscape level. Therefore their planning and control should take place at the same scale. The primary objective of this work was to assess soil chemical properties and their changes in relationship to ecosystem management, especially forest conversion and forest liming. We calculated scenario models, based on regression analysis, which allow such an examination in the context of understanding landscape processes which can be expected to operate in the sampling region. Stepwise multiple linear regression analysis was used to predict soil chemical attributes (base saturation, pH, C/N content and stock, exchangeable stocks of Ca and Mg) as indicators of site stability or off-site effects of forest ecosystems such as effects on clean drinking water from forested watersheds. Because of space limitations, in this paper only the modelling results of base saturation are presented. Base saturation was used as an integrative example for other soil chemical properties. The transformation of measurements to the regional scale, i.e., the regionalization, was calculated for the forested parts of two test regions in the Black Forest on the basis of measured chemical properties of 90–150 soil profiles per test region. The models have a spatial resolution of 50×50 m, which is a spatial scale relevant for forestry practice and forest management. Topographic variables (e.g., elevation, aspect, slope gradient, and slope length), the stratigraphic classification of the geologic substrate, stand characteristics from forest inventory data, and finally technical information about forest liming were the auxiliary variables (secondary site properties) that provided indirect information about base saturation and were available for the whole forested area of the test regions. Base saturation could be predicted with an accuracy of ~50–70% (in terms of the multiple R2) by using these properties as predictor variables in multiple linear regression analyses. The explained proportion of variance was unexpectedly high considering the high geomorphological heterogeneity of the two test regions. Based upon the regionalization models, it was possible to establish scenarios showing the landscape-related effects on base saturation that may be achieved by forest conversion towards a higher proportion of forests with broad-leaved mixed stands and by forest liming. These scenarios allow the interactions between several influencing factors and management strategies and the impacts on the target variable to be synoptically judged. Thus the presented regionalization models achieve the role of decision support tools for the planning of forest management at the landscape level. They allow an assessment of the environmental effects of forest management strategies in terms of site sustainability or preservation of water resources in forested catchments. 相似文献
17.
18.
基于"3S"技术,采用总体蓄积抽样控制、小班调查、消耗量调查等方法,查清了师宗县各类土地面积和各类森林蓄积、林木和林地资源的种类、数量、质量,落实了森林分类经营区划,对调查数据动态变化进行了分析,提出了加强天然林保护、商品林多功能经营、发展林下经济和生态旅游等林业发展建议。 相似文献