森林资源一类和二类调查存在的主要问题与对策

对森林资源一类清查和二类调查本身存在的主要问题及其调查成果因诸多原因存在的不可比性问题进行了探讨，研究提出了相应的对策。     

基于单纯形算法的优化设计与实现

阐述了线性规划标准形式及转换方法,介绍了单纯形算法,并设计实现算法,提出了一种单纯形表快速操作技术。     

辽东地区鸭种资源的研究现状及选育前景

辽东白嗉鸭是一个具有独特外貌特征和生产性能的地方鸭种资源类群.从羽色及蹼色分为3个亚型:黑羽白嗉;银灰羽白嗉;金掌白嗉.初步研究结论为:该鸭种有兼用型的体态特征和肉用性能特征.银灰羽类群的初生重及24周龄的体重均高于黑羽类群,但差异不显著(P＜0.05).蛋用性能、繁殖性能等其他生物学特性尚在研究中.     

各国可持续农业发展道路与资源利用模式比较

阐述了可持续农业有关概念、定义及其实质内涵,并比较分析了国外一些国家和我国台湾省可持 续农业发展模式,论述了我国不同地区农业持续发展及资源利用模式,指出我国SARD模式已经展现了我国农业现代化方向和农业与农村经济可持续发展的道路。     

Testing the importance of spatial configuration of winter habitat for woodland caribou: An application of graph theory

Conservation of remaining woodland caribou (Rangifer tarandus caribou) populations requires land management strategies that not only maintain caribou habitat, but also favour habitat connectivity. This study presents and field tests graph theory-based measures of landscape connectivity, and demonstrate an association between the distribution of woodland caribou and well-connected winter habitat. Cost values for the intervening land cover types were determined based on the probability of selection relative to high-quality winter habitat. Habitat connectivity was then represented by linking high-quality habitat patches along least-cost paths through this parameterized cost surface. A randomization procedure was used to assess the animal’s association with habitat connected at increasing distance thresholds to identify appropriate scales of response. A strong relationship was obtained between large clusters of high-quality winter habitat patches and winter GPS telemetry location points (November 1-March 15) from two woodland caribou herds in Manitoba, Canada. This relationship was stronger when only late winter location points (January 1-March 15) were used. Our results highlight the importance of accounting for the spatial configuration of habitat on the landscape and the intervening land cover types when assessing range quality for woodland caribou. They also provide support for the use of graph theory to assist in identifying core activity areas for woodland caribou and key linkages between these areas and other parts of the landscape.     

When functional habitat does not match vegetation types: A resource-based approach to map butterfly habitat

The unambiguous recognition of a species’ habitat is a matter of debate. For terrestrial species, habitat is often defined as physical patches of a certain vegetation type in a matrix of non-habitat. Ecological resources that make up the habitat of a species may, however, only cover subsets of vegetation types or can be spatially dispersed in a complex way over different vegetation types. Here we present and test a procedure to recognize and delineate habitat according to a resource-based approach instead of a vegetation-based approach. We used the green hairstreak butterfly (Callophrys rubi) in a heathland landscape as a study case. Our resource-based habitat approach selects those zones that comprise essential resources and conditions within an appropriate spatial window. Variables that were retained in a logistic regression model were used to calculate larval, adult and combined habitat indices in a GIS, taking into account thermal constraints on resource-use, as this is a key habitat aspect for this heliothermous insect. To group different (and sometimes scattered) ecological resources into functional habitat zones, we derived a measure of space-use from mark-release-recapture data. By least-cost modelling this spatial window was adapted to the nature of the vegetation between sets of resources. The habitat zones that were delineated using this approach matched the observed distribution of butterflies significantly better than did a classic approach based on vegetation types with host plants only. Our approach provides concrete output for conservation purposes, like recognizing zones with the highest potential for habitat restoration.     

安徽省师范院校图书馆电子资源建设现状研究

通过网络调查的方式,对安徽省7所师范院校图书馆电子资源的建设现状进行了统计,对统计的结果进行了分析,基于此提出了一些相应的对策。     

关系型数据库在教职工信息管理方面的应用——以《资环信息录》为例

随着高校办学规模的扩大,教职工的数量亦逐年增加,同时使信息的管理工作量倍增。以湖南农业大学资源环境学院为实例,引入关系型数据库的概念,对其信息管理系统进行了可行性分析及实现论证,据此开发了兼容性较好的《资环信息录》系统。关系型数据库的应用,既可高效率、低成本地对教职工个人信息、工作信息及校院系相关信息进行现代化管理,又能为学校信息管理节约大量的人财物力。     

长江师范学院校园鸟类调查及保护对策

2008~2009年,采用样线法和鸟鸣声识别法对长江师范学院校园鸟类资源进行调查。结果表明,该校园内共有鸟类39种,隶属于8目25科,其中留鸟22种,约占总数的56.41%,夏候鸟13种,约占总数的33.33%,冬候鸟4种,约占总数的10.26%;区系分析结果表明,东洋种鸟类16种,占总数的41.03%,古北种15种,占总数的38.64%,广布种8种,占总数的20.51%,其中八哥、白颊噪鹛、白头鹎、白鹡鸰等为优势种。     

知识管理在数字图书馆资源建设中的运用

随着知识经济时代的来临,知识管理正在成为一个热门的前沿领域,通过阐述知识管理的概念及其涵义和数字图书馆知识管理的内涵,分析目前我国数字图书馆信息资源的现状,提出了数字图书馆知识管理的实现对策。