以鄠邑区为例的基数转换要点研究

随着各级国土空间总体规划工作的推进,明确各地现状数据的工作日渐紧迫。以三调为基础的现状数据不能满足和符合国土空间总体规划的工作要求,所以在三调基础上科学准确的衔接规划编制所需的空间关联信息和现状数据,形成科学、准确的现状底图是保证空间规划编制科学有效的基础。因三调数据与其他关联数据在坐标、分类等方面存在差异,因此需要对其进行分类转换。本文在梳理三调工作分类和规划用途分类对应关系的基础上,以鄠邑区为例,对具体实践中遇到的主要问题提出相关建议。     

Airborne laser scanning as a method in operational forest inventory: Status of accuracy assessments accomplished in Scandinavia

Abstract

This research reports the major evaluation results from an operational stand-based forest inventory using airborne laser scanner data carried out in Norway. This is the first operational inventory in which data from two separate districts are combined. Laser data from two forest areas of 65 and 110 km² were used to predict six biophysical stand variables used in forest planning. The predictions were based on regression equations estimated from 250 m² field training plots distributed systematically throughout the two forest areas. Test plots with a size of 0.1 ha were used for validation. The testing revealed standard deviations between ground-truth values and predicted values of 0.58–0.85 m (3.4–5.6%) for mean and dominant heights, 2.62–2.87 m² ha^?1 (9.3–14.3%) for basal area, and 18.7–25.1 m³ ha^?1 (10.8–12.8%) for stand volume. No serious bias was detected. For 10 of the 12 estimated regression models there were no significant effects of district.     

河流游憩规划的基本问题探讨

在对河流游憩概念认识、发展背景和研究进展进行分析的基础上,从资源保护的视角出发,对河流游憩规划的本质和国外规划实践中所面临的基本问题及其解决方法进行深入探讨,认为游憩利用和保护的关系协调、游憩和其他河流利用的关系协调、游憩利用本身所面临的问题是河流游憩规划需要解决的基本问题,得出保护性利用是河流游憩规划主旋律的结论。     

论生物多样性与建设海南国际旅游岛的关系

经过多年的研究和实践,人们已深刻地认识到,海南省的发展战略应该积极发展服务型、开放型和生态型经济,形成以旅游业为龙头、以现代服务业为主导的特色经济结构。显然要实现这个宏伟的目标,生物多样性的保护和持续利用就是最根本和最关键的问题。如果作为生态旅游基本资源的季节性雨林、红树林、海洋生物资源和农业生物多样性被毁,一切都将是一纸空文。本文就拟简略地探讨一下有关这些方面的问题,并提出一些建议供有关方面参考。     

Do labour productivity and preferences about work load distribution affect reproduction management and performance in pig farms

Increases in labour productivity are essential factors, as well as technical effectiveness, for the competitiveness of pig farming. However, the preferences of farmers for controlled (i.e. limited) daily working hours or available days for vacation also increase. The objective of this study was to explore how these preferences about work might be associated to specific combinations of practices or affect performance. The study was carried out by direct investigation of the stockbreeders. Data analysis used factorial analysis to identify relationships between practices, labour productivity, sow productivity and work load distribution. Results showed independence between sow productivity and labour productivity. Three independent types of preferences about work load distribution were identified: the limitation of density of daily work, the avoidance of insemination activities during the weekend and the avoidance of farrowing supervision during the weekend. These preferences about work load distribution were mainly related to weaning, oestrus detection and insemination techniques. A relationship was also seen between farrowing and cross-fostering techniques, and labour and sow productivity. Results suggest that preferences about work load distribution influence the choice of reproduction practices without influencing performance. Finally, concerning the labour productivity, it was linked with some specific techniques at farrowing but the results also indicated that it was mainly related to the size of farrowing batches.     

北方农牧交错带土地利用结构的线性规划——以定西县为例

探讨了用线性规划方法优化土地利用结构,并以北方农牧交错带定西县土地利用结构的经济效益作为目标函数,以人口和自然条件作为约束条件,进行优化分析,规划结果为定西县土地利用结构由2005年的农、林、草面积比例54:10:36调整为30:13:57.     

互联网+环境下饲料品牌的策划和实践

随着市场环境的不断发展变化,消费者越来越重视产品的品牌效益,品牌建设已成为当前饲料企业市场竞争中取胜的重要法宝,饲料企业可通过品牌策划与实践提升产品的知名度,加强企业自身的商业信誉,从而提升饲料产品的销售份额,有效扩大消费群体,为企业的长远发展提供广阔的潜力。因此,饲料企业要重视互联网+环境下品牌的策划与实践,通过优化策划方案、创新推广路径等方式加强企业品牌建设。     

新世纪保护区面临的挑战及其有效对策

道路、水库、建筑物、不断扩大的农田和土地退化正在使自然景观的完整性受到严重破坏。所保存的未经干扰或少受干扰的天然生态系统的面积日益缩小，犹如海洋中的孤岛。生物多样性受到严重的威胁。在自然保护区中，物种迁移和基因流动的可能性也在不断地降低。生物区域规划被认为是一种较好的选择，它力求把保护区和栽培地区视为一个有机整体，遵循保护和发展密切结合的方针，制定行动计划并予以实施。本文根据保护区的管理情况、工作条件和科研状况等，对保护区或区域的类型进行了划分，针对现实，提出了如何实施生物区域规划。     

AutoCAD制图软件在汕头林业调查规划中的应用

从已有图纸资料的扫描输入,设置绘图环境,矢量化地形图,创建图层,用GPS数据绘制小班图,面积或路程求算,绘制图签、图例,文件保存格式,打印出图等方面阐述了AutoCAD在汕头市林业调查规划设计制图中的应用方法.认为用AutoCAD制图较Photoshop精度、效率高,并能较精确地进行面积及距离的求算.     

公路对陆生脊椎动物影响的研究

公路在推动我国社会、经济发展的同时也对路域（沿带状公路向周围延伸一定距离的空间范围）野生动物产生了严重的负面影响,特别是陆生脊椎动物。本文就如何利用样带法和样方法对路域陆生脊椎动物种类、数量、公路交通造成的动物死亡数等进行调查作了详细阐述。结合国内外相关领域学者的研究成果分析了公路对不同类别或种类陆生脊椎动物的影响。呼吁国内学者开展更多公路对陆生脊椎动物影响的实质性研究,并将成果运用于研究地区以后的路网设计与改造实践中。