2,2′,4,4′-四溴联苯醚的毒性效应、来源、分布与环境行为

系统分析了2,2′,4,4′-四溴联苯醚（BDE 47）在环境介质中的分布和主要来源。从甲状腺、神经、生殖繁育3个方面,阐述BDE 47毒性效应。从溶解分配、光降解、生物积累和生物降解4个角度,论述BDE 47主要环境行为。最后,提出了今后BDE 47研究的重点。     

我国野生动物所有权立法述评

野生动物所有权在野生动物保护事业中具有十分重要的地位,为此,我国先后制定了多部与野生动物所有权有关的法律法规,将野生动物所有权纳入法律调整的范围。但是受制定法律法规时各种条件的限制,目前我国野生动物所有权立法存在着一些不尽合理的地方,本文通过对我国野生动物所有权规范性法律文件的梳理,分析了立法方面存在的不足,并提出了立法建议。     

丝素/壳聚糖共混膜性能测定及制备配方探讨

为改善丝素膜的性能,试验选择丝素与壳聚糖混配比例、烘干温度、戊二醛及甘油浓度四因素,采用L32(8×48)正交设计方案,制备丝素与壳聚糖复合膜。检测结果表明,共混膜的溶胀度为43.00%~248.94%,热水溶失率为43.06%~64.56%,透汽率在36.82%~55.39%之间,初始模量、相对断裂强度和相对断裂伸长分别在6.35~68.80 N/mm,30.85~67.83 N/mm和28.05~230.47范围内;经红外光谱分析知,丝素与壳聚糖只是物理混合,两者处于相容状态。初步选定制备丝素/壳聚糖共混膜的较优组合条件为:丝素质量分数70%或55%、烘干温度40℃,戊二醛和甘油的体积分数均为0.3%。     

不同粳稻品种群体整齐度的比较分析 Ⅲ.不同施氮水平对品种性状及整齐度的影响

对不同施氮水平下参试品种主要性状及整齐度的分析结果表明,与中等肥力(纯氮125kg/hm2)相比,高肥(纯氮225kg/hm2)时多数品种表现空秕率显著上升,谷草比明显下降,单株穗数增加,产量降低,茎变高,穗粒数增加,出穗期延迟,着粒密度增大,穗子略微变长。高氮后各性状的整齐度也发生了不同方向的变化,平均变化幅度最大的是穗长,然后依次为穗粒数、茎高、穗一次枝梗数和单株穗数。从品种来看,吉粳63、下北和通35在高氮后绝大多数性状的整齐度明显下降,产量也大幅度降低,说明这3个品种不宜在高氮水平下栽培,而玉丰、北陆128和长白九号与上述品种相反,高氮后多数性状的整齐度反而提高,产量亦持平或略有增加,因而适宜在较高氮素水平下种植。     

A Survey of Forestland Conservation Easements in the United States: Implications for Forestland Owners and Managers

Internationally, conservation easements are increasingly popular land management tools for private landowners, government agencies and non-governmental organizations seeking to preserve forests and other natural settings. This paper reports a study of the design and use of conservation easements by organizations and public agencies in the USA. More than 355 conservation organizations and 16 state agencies holding at least 3,598 forestland easements were identified. Demonstrated shortfalls in baseline forest inventories, record keeping, and professionally-developed management plans were evident on working forest easements. Failure to address these shortcomings runs the risk of jeopardizing the legitimacy of the easement approach even where favorable legal and tax conditions exist. Management restrictions varied broadly, with a minority of respondents prohibiting such techniques as clearcutting and salvage logging. Concerns for the use of chemicals, best management practices, and streamside management zones were commonly reflected in easement language, whereas logging road design and the cultivation of old-growth conditions remain largely undeveloped. Implications from the US experience, where easements are relatively well-developed, highlights the need for professional forestry advice—particularly for non-industrial or small-scale forest owners—in both easement development and implementation, the need for careful planning, and the need to carefully consider the respective goals of the forest landowners in crafting the easement documents. In the cases of developing nations, consideration of the differing needs of landowners may require increased flexibility in management documents.     

新型城镇化背景下我国集体土地“农转非”矛盾研究

从耕地的减少与兼业户增加、土地征地拆迁产生利益分配和城市文化消失、城市规模过大和建设千篇一律3个方面的矛盾进行了阐述和分析,最终提出了发挥集体权力,实现耕者有其田;发展中小城市的规模,实现集聚经济;土地尽其利,农户参与决策等解决策略。     

《竹子研究汇刊》性质及学科分类

根据期刊性质和学科分类方法，以文献数量为依据对《淡水渔业》进行分类。《竹子研究汇刊》2009年刊登的文献全为学术性，故归类为学术性期刊。此外，林业类文献占当年发表文献总量的72．41％，其他学科文献均较少，不能划入相应学科，故将该刊归类为以林业学科为主的综合性学术期刊。     

农村土地流转问题综述

从政府、农民、市场3个方面论述了在不同阶段土地流转问题的具体表现,并指出土地流转问题不仅仅是制度安排方面的产权问题,而且是经济问题,土地流转工作的顺利开展应从多个角度入手。     

武汉市城郊耕地流失特征与对策研究

阐述了武汉市城郊耕地呈现出总量和人均占有量呈双下降、质量下降和土壤环境恶化相互制约、现有资源浪费和后备资源缺乏同时并存、功能＂非粮化＂趋向明显等特征,运用产权制度经济学和委托—代理理论深入剖析了武汉市城郊耕地快速流失的深层原因,并提出相应的建议。