赏食兼用型辣椒品种选择与工厂化盆栽管理技术

为了满足人们对美好生活的向往和需求,顺应蔬菜多功能利用开发的新业态发展趋势,佛山市近年来在观赏、食用型辣椒盆栽生产方面进行了大胆尝试,在观赏型辣椒品种的特征特性、盆栽管理技术特点及延长果实观赏期方面进行了深入探索,总结出一套适合当地观赏、食用型辣椒种植的栽培技术,主要包括育苗基质配比、适宜播种时期、定植营养土调配、肥水...     

波兰的森林认证

文中介绍了波兰的森林认证发展进程, 特别是森林认证体系, 森林认证现状及认证对林业的影响以及当前面临的问题和挑战, 对我国制定森林认证标准、建立森林认证体系、推动我国森林可持续经营具有一定的借鉴作用.     

森林生物多样性价值会计核算研究综述

森林生物多样性价值会计核算是森林生物多样性保护与可持续利用的一项重要基础性工作.文中总结了国内外森林生物多样性价值会计核算的相关研究情况及存在的问题, 以期为进一步的理论研究及实践提供条件和依据.     

Habitat utilization and vertical movements of white marlin (Tetrapturus albidus) released from commercial and recreational fishing gears in the western North Atlantic Ocean: inferences from short duration pop-up archival satellite tags

Researchers have applied numerous techniques to improve billfish stock assessments, including habitat‐based models that incorporate behavioral and oceanographic parameters to standardize historical catch‐per‐unit‐effort time‐series data. These methods have allowed researchers to account for significant changes in the depths of pelagic longline (PLL) gear deployments over time. This study presents habitat‐use data recovered from high‐resolution 5‐ and 10‐day pop‐up satellite archival tags (PSATs) attached to 47 surviving white marlin released from commercial and recreational fishing gears offshore of the U.S. East Coast, the northern Caribbean, and Venezuela between 2002 and 2004. Data recovered from transmitting tags indicated that white marlin spent nearly half of their time associated with warm, near‐surface waters (<10 m). All fish displayed frequent short duration (mean: 39.8 min) vertical excursions from surface waters to depths averaging 51 m. Qualitative and multivariate classifications of data from completely transmitted movements of surviving white marlin revealed two major types of descents: one pattern was characterized by deep ‘V’‐shaped excursions of relatively short duration (mean: 23.4 min) while the other featured descents that were more broadly ‘U’‐shaped and confined to a specific depth range for an extended period of time (mean: 75.8 min). Based on the frequency, persistence, and patterns of these vertical movements, white marlin appear to direct a considerable proportion of foraging effort well below surface waters, a behavior that may account for relatively high catch rates of white marlin on some deep‐set PLL deployments.     

Model uncertainty in the ecosystem approach to fisheries

Fisheries scientists habitually consider uncertainty in parameter values, but often neglect uncertainty about model structure, an issue of increasing importance as ecosystem models are devised to support the move to an ecosystem approach to fisheries (EAF). This paper sets out pragmatic approaches with which to account for uncertainties in model structure and we review current ways of dealing with this issue in fisheries and other disciplines. All involve considering a set of alternative models representing different structural assumptions, but differ in how those models are used. The models can be asked to identify bounds on possible outcomes, find management actions that will perform adequately irrespective of the true model, find management actions that best achieve one or more objectives given weights assigned to each model, or formalize hypotheses for evaluation through experimentation. Data availability is likely to limit the use of approaches that involve weighting alternative models in an ecosystem setting, and the cost of experimentation is likely to limit its use. Practical implementation of an EAF should therefore be based on management approaches that acknowledge the uncertainty inherent in model predictions and are robust to it. Model results must be presented in ways that represent the risks and trade‐offs associated with alternative actions and the degree of uncertainty in predictions. This presentation should not disguise the fact that, in many cases, estimates of model uncertainty may be based on subjective criteria. The problem of model uncertainty is far from unique to fisheries, and a dialogue among fisheries modellers and modellers from other scientific communities will therefore be helpful.     

小麦蚜虫抗药性现状及综合治理策略

综述了麦蚜抗药性的形成和发展、抗药性现状、抗药性机理等,并提出了相应的综合治理策略。     

提高中文社科纸质型期刊利用率的管理探索

文章从三个方面对如何提高中文社科纸质型(或印刷型)期刊利用率的管理进行实践探索,取得良好效果进行阐述。     

对图书馆员常态量化绩效管理的实践探索

图书馆在对馆员日常管理中,由于对其品德、业绩、能力等综合指数缺乏比较精确的量化评价,往往使部分馆员认为年度考核不公、流于形式或失真,常常在工作中引发消极情绪。分析馆员考核结果失真的原因,研究失真的对策,应成为图书馆界研究的一个重要课题。以东北林业大学图书馆为例,将图书馆试行一年来绩效管理的实践探索加以总结,以期对日后推动科学化管理有所助益。     

高校电子阅览室管理之我见

高校图书馆电子阅览室在服务于教学、科研以及提高大学生的网络素质教育方面发挥着重要作用,与传统阅览室相比数字化电子阅览室丰富了馆藏资源,提高了检索效率,扩大了读者服务范围,同时发展中也出现了新的问题：网络不良信息对部分读者的影响令人担忧;功能定位有待强化,工作人员管理水平与网络知识水平有待提高。本文就强化高校电子阅览室的管理与建设过程中的制度建设、如何有效发挥管理人员的主观能动性,加强技术手段管理和有效组织网络资源．优化电子阅览室文献与信息查询平台等方面进行了阐述。     

城市绿化中的大树移植

随着人们对环境的重视,城市的绿化工作变得越来越重要。在绿化工程中,栽植大量的苗木,其中不乏一些大规格得苗木,规格大的苗木在绿化中,有见效快、效果好的特点,所以在将来的绿化工程中,会有更多的大树被应用。根据不同地区,选择不同的大树,不但可以起到绿化效果,还能保证苗木的成活率。在起挖和栽植时,应对大苗进行特殊处理,保证其成活率,后期的养护管理也是保证苗木成活的关键。