泰州园艺博览园花境配置模式探析

泰州园艺博览园于2009年建成,其花境的运用推广取得了良好效果。根据不同立地环境与组合材料分别介绍了其花境的配置模式,针对其存在的问题进行了分析,包括认识的不足、养护与管理、绿化工程的局限性、冬季效果不理想等内容,并提出了相关建议,以期促进花境的推广应用。     

百合染色体细胞学研究进展

百合属绝大多数种是2n=24的二倍体,其核型具有稳定性,一般为3B型,存在少数多倍化现象,但广泛存在B染色体,百合染色体核型的差异正是环境因素和结构变异共同作用的结果。通过百合属C-带带型中单套染色体条带数及特征染色体可以清晰地区分形态学相似的百合属植物,但采用尿素法进行G带带纹的鉴定有更高的分辨率。原位杂交技术已运用于百合属植物的区分和杂种后代的鉴定,而GISH较FISH更适用于杂种百合的鉴定。     

基于循环经济新视角的苎麻产业化模式研究

针对苎麻生产过程中存在的问题,构建了苎麻产业化生产的新模式,并分析了新模式的发展优势与特点。     

农村电子政务系统软件架构研究

农村电子政务系统是新农村运动的重要组成部分,农村电子政务系统的应用范围非常广泛,如何能够快速构建新农村信息化的不同范例版本,从而提高软件开发效率和质量是当今国内软件工程研究的重要课题.本文基于Visual Studio.NET平台,构建由表示层、数据访问层所组成的农村电子政务系统软件架构进行了简要论述.     

甘肃省发展农村能源生态模式效应及应用实例

甘肃省由于生态环境脆弱,燃料紧缺,由此造成了一些地区开荒垦种、铲草皮、刨草根,砍伐林木、焚烧秸秆,使自然植被稀少,生态环境恶化,水土流失加剧。针对该地区生态状况,分析介绍了发展农村能源生态模式的作用,资源循环利用效果及已经取得的成就。     

不同前作对杂交狼尾草产量和品质的影响

对长江流域农区不同粮草前作下杂交狼尾草的草产量、再生情况和营养品质进行了研究。结果表明,多花黑麦草茬的杂交狼尾草长势好、再生植株高、分蘖多、叶面积指数大、干物质积累多、产量较高。而且茎叶比较小、鲜干比较大、适口性较好。黑麦茬茬口较早,杂交狼尾草产量高,小麦茬表现最差。但是不同前作对杂交狼尾草的营养品质的影响较小。为了达到高产优质,杂交狼尾草应与多花黑麦草或黑麦进行复种。     

Contribution to the Restoration of Mixed Forests in Central Vietnam

This article investigates options for reforestation in degraded forests in Central Vietnam within the context of sustainable forestry and presents a forest management plan for the forests around the community of Phong My. In the past, the area was damaged during the war between Vietnam and the United States and after that by overcutting. Forests have gradually been degraded and now they are replaced by plantations of fast-growing Acacia (Acacia mangium). After final harvests, the stand remnants are burnt and the burnt area is again regenerated via artificial regeneration of Acacia. Here, we propose several mixtures in which Acacia stands can be augmented with other tree species. A proposed system of afforestation and subsequent management is given here with the goal of encouraging mixed species, multiple cohort stands, and disincentivizing the method of slash-and-burn. The proposed afforestation patterns were also used to calculate the future number of seedlings required to enable the enlargement of quality forests at the expense of degraded ones.     

Adiaspiromycosis in suspected cases of pulmonary tuberculosis in the common brushtail possum Trichosurus vulpecula)

Pulmonary adiaspiromycosis was diagnosed in 15 of 17 common brushtail possums (Trichosurus vulpecula) examined for bovine tuberculosis. Emmonsia crescens was isolated from two of the affected animals. This is the first reported isolation of this dimorphic fungus in New Zealand. The infections varied from light to heavy with sparsely distributed, focal, 1–2 mm diameter, grey-white spherical granulomas in the lightly infected cases to innumerable foci throughout the lungs in the heavily infected cases. Histologically, the lesions were characterised by a central fungal adiaspore consistent in morphology with E. crescens located in alveolar spaces or bronchioles. These were surrounded by a cuff of granulomatous inflammation which varied in density and extent in proportion to the degree of degeneration exhibited by the organism.

The lesions in most cases of adiaspiromycosis in the possum are sufficiently distinctive to allow their differentiation from tuberculosis by gross examination, but where any doubt exists over the possibility of dual infection by Emmonsia and Mycobacterium species differentiation should be made on the basis of a histological examination of the tissue and culture for mycobacterial organisms.     

大庆龙凤湿地春季鸟类多样性研究

大庆龙凤湿地在动物地理区划分上属于古北界,本次调查在其保护区内共发现鸟类71种,隶属10目27科,其中国家Ⅰ级保护动物3种,Ⅱ级保护动物11种,调查仅限于春季,一些保护区曾经出现过的国家珍稀保护动物没有被发现。由于保护区有大面积湿地,所以水禽种类占大多数,且数量众多。鸟类组成以夏候鸟为主,种类有42种,占总数的59.15%。本次调查中,古北界鸟类54种,占总数的76.06%;广布种17种,占总数的23.94%;没有东洋界鸟类的入侵。很多鸟类从这里迁徙和经过,且以古北区的鸟类为主。本次调查采用样带、样点和定点观察法,对保护区内的鸟类种类和数量做了调查统计,并分析出近几年来这里鸟类种类数量减少的原因。     

稻蟹共生系统不同水稻栽培模式土壤理化性状和有效养分的变化规律

试验设置养蟹田单穴单株、单穴双株、单穴四株和不养蟹田单穴双株4个处理,研究了不同水稻栽培模式下稻田土壤容重、团聚体含量、pH、有机质、土壤总氮、碱解氮、速效磷、有效钾和水稻产量的变化规律。结果表明:与不养蟹稻田相比,养蟹稻田可以显著降低土壤容重,增加粒径>0.2 mm团聚体的含量,降低粒径<0.002 mm微团聚体的含量,土壤团聚化程度加强,同时可以调节土壤pH,显著提高土壤中有机质的含量,但对土壤总氮含量影响不显著,在水稻生长后期会显著提高土壤中碱解氮、速效磷、有效钾含量,养蟹稻田内理化性状和土壤养分含量受栽培模式的影响均不显著。养蟹稻田水稻产量高于常规稻田,养蟹稻田内各处理间差异不显著,以单穴四株水稻产量最高。