实现森林资源动态更新管理的时态GIS技术

针对森林资源数据动态更新和管理的难题以及当前几种数据更新管理技术存在的局限,提出了时态GIS技术是解决该难题的有效途径和必然趋势。     

县级森林资源信息管理系统设计

运用建模工具软件、采用可视化建模的方法及标准的建模语言,比较系统地介绍了通用且符合“数字林业标准与规范”的县级森林资源信息管理系统的设计思想、主要内容及建立方法。内容包括：(1)系统开发思想与方法;(2)系统设计目标与要求;(3)系统分析及设计;(4)县级森林资源管理系统开发方法等。     

数据共享技术的国内外发展与现状

本文比较明确地阐述了数据共享技术的国内外发展与现状,并对数据管理系统的建设提出了 相应的措施。     

森林灾害监测方法研究──以西南地区火灾监测为例*

森林灾害监测方法研究──以西南地区火灾监测为例纪平，易浩若，白黎娜关键词人工神经元网络，ＮＯＡＡ数据，遥感，专家系统目前，世界上许多国家都已开展了森林灾害监测方面的研究。１９８７年大兴安岭森林大火之后，我国也充分认识到了森林防火的重要性，并积极开展了...     

利用计算机技术编制采伐限额

温岭市利用经理期内的二类调查数据,结合补充调查,通过数学模型更新资源数据,采用地理信息系统、计算机辅助制图、数据库等计算机技术,按时、高效、高质量地完成了“十一五”编限工作。     

基于虚拟仪器技术的自动立木整枝机离合弹簧性能测试系统的设计

离合弹簧在自动立木整枝机变速换向过程中起着重要的作用.本文分别从硬件设计和软件设计两方面介绍了基于虚拟仪器技术开发的自动立木整枝机离合弹簧性能测试系统,该测试系统支持不同类型信号的多通道数据采集和处理,能够实现信号的产生、数据实时采集、数据处理、分析、显示及存储等功能,并通过多次测试离合弹簧的实验,验证了该测试系统的实用性和可靠性.     

数据库技术在园林植保中的应用现状及趋势

文章阐述了数据库技术在植保领域中的应用和当前的开发现状。介绍了上海市绿化植物有害生物信息查询系统（VPPDIS）的开发情况及其主要功能，并对数据库技术在园林植保中的应用前景进行了探讨。     

Comparison of the modified Weibull and Richards growth function for developing site index equations

A site index model based on the Weibull cumulative distribution function was fitted to three stem analysis data sets of black spruce (Picea mariana (Mill) BSP), white spruce (Picea glauca (Moench) Voss) and aspen (Populus tremuloides Michx.). The resulting equations were compared with those based on the modified Richards' (1959) biological growth function (Ek 1971; Payandeh 1977, 1978). The Weibull-type model performed as well as or better than the biological growth function for white spruce and aspen, respectively, but it performed less accurately in the case of black spruce. The Weibull-type model appears to behave better, i.e., it produces more realistic height growth patterns, than the Richards function upon extrapolation particularly at young ages.     

Predicting regeneration establishment in Norway spruce plantations using a multivariate multilevel model

This study predicts the regeneration establishment on 3-year-old Norway spruce (Picea abies (L.) Karst.) plantations in southern Finland using regeneration survey data. Regeneration establishment was described by seven response variables: number of planted spruces, natural Scots pines (Pinus sylvestris L.), natural spruces, natural seed-origin birches (Betula pubescens Ehrh. and B. pendula Roth.) and other broadleaves (i.e. sprout-origin birches and other broadleaves than birch), as well as height of crop-tree spruce and dominant height of broadleaves. Due to the multivariate (several responses for each plot) and multilevel (plot, stand, municipality, forest centre) structure, regeneration establishment was modelled by fitting a multivariate multilevel model with explanatory variables such as temperature sum, site fertility, soil quality and method of site preparation. In the model, the numbers of tree seedlings were modelled using over-dispersed Poisson distributed equations, and the tree heights were modelled using normally distributed linear equations. The estimated fixed and random parameters of the equations were logical, and there was no serious bias in predicting the regeneration establishment in the independent test data set. This modelling approach can be used to predict the regeneration establishment stochastically by taking into account the large unexplained variation in regeneration models.     

MapX在空间数据绑定与林业专题图制作中的应用探讨

从空间地图数据与属性数据的关联、专题图的生成各方法，就MapX在林业地理信息系统开发中空间数据绑定与专题图制作中的技术等作了简要探讨。