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土壤环境变化对土壤动物群落影响的研究 总被引：48，自引：6，他引：48
土壤是环境系统中物质与能量交换的枢纽 ,土壤动物在土壤物质能量迁移转化过程中具有特殊的功能和作用。然而 ,随着人类活动对环境影响的加剧 ,原生植被受到破坏 ,各种污染物质不断在土壤中富集 ,对土壤动物的生存繁衍带来严重威胁 ,目前土壤动物学者的研究 ,主要集中在土壤动物在成长过程中的作用 ,理化性质的改良 ,土壤养分循环以及区系分类等 ,很少涉及土壤动物与环境特别是污染环境关系的研究。农药是目前主要的化学性环境污染物 ,农药污染对自然和农田生态系统的结构和功能都有影响[1] ,有实验表明 ,农药污染对土壤动物新陈代谢及卵的… 相似文献
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以动物生理学实验独立设课为例，明确该实验课程的主要教学目标——“使学生掌握动物生理学实验所需的基本技能和提高学生创新能力”，围绕这个实验教学目标。对现有的实验课程教学体系进行改革和完善，从而使“动物生理学实验独立设课”课程体系更为完整。以利于培养学生创新能力，适应新时期教学的需要。 相似文献
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我国土壤动物学研究概况与展望 总被引：11，自引：0，他引：11
本文简要介绍了我国土壤动物学研究的历史和现状，从以下六个方面介绍和讨论了今后值得注意的一些问题和可能的研究方面。１、土壤圈与其它生态系统的物质循环和能量流动。２、土壤动物群落生物多样性研究。３、植物与土壤动物的相互作用。４、土壤动物与土壤微生物的相互作用。５、土壤动物个体生态学。６、土壤动物在环境保护中的应用。 相似文献
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2004年1月，在广西南部中越边境地区的宁明县考察时，采到一号翚形目鸟类标本，经鉴定为仓鸮(Tyto alba)，是广西鸟类新纪录。标本保存于广西大学动物科学技术学院动物标本室。 相似文献
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2004年7月,在广西西部地区的西林县考察时,采到一号雀形目鸟类标本,经鉴定为灰喉鸦雀(P arad oxorn is a lphonsianus),是广西鸟类新记录。标本保存于广西大学动物科技学院动物标本室。 相似文献
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作为新兴学科和交叉学科的动物微生态学课程，是高校动物医学和动物科学专业本科生的重要应用型专业课，学好这门课程对于拓宽学生的学术视野及实践应用能力很重要。本文提出了在动物医学和动物科学本科教育中，加强动物微生态学课程势在必行。从合理利用多媒体新手段；选择重点教学内容，合理组织教学内容和安排教学程序；灵活多样的教学方法；及时更新教材；提高教师综合素质等几方面来介绍提高该课程教学质量的一些体会。 相似文献
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提出了多媒体技术的概念,指出了多媒体技术在教学中的运用可将抽象的概念、复杂的数学模型直观地展示在学生眼前,让学生能更迅速地理解和掌握知识要点,起到事半功倍的效果,并提出日常教学过程中使用多媒体辅助教学存在的弊端。 相似文献
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广西两栖类一新记录--镇海林蛙 总被引：1，自引：0，他引：1
2001年在广西元宝山自然保护区进行动物资源考察时，采到一号蛙类标本，经鉴定为镇海林蛙（Rana zhenhaiensis），是广西两栖类无尾目新记录。标本现保存于广西大学动物科学技术学院标本室。 相似文献
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Soil animals (macro and microarthropods, annelids, nematodes) were sampled along an altitudinal gradient and over 2 years in holm oak (Quercus rotundifolia) forests of the Moroccan Atlas. We studied the influence of elevation and year on the vertical distribution of soil fauna. Whatever the elevation (1500, 1700 and 1900 m), the humus form was a Dysmull, with a thick litter horizon and a fine crumb A horizon. Thirty-six categories of fauna were found and classified at the group level. The influence of horizon, altitude and year was analysed by analyses of variance (ANOVA, on seven broad zoological groups and on total fauna) and correspondence analysis (on 36 zoological groups). There was a decrease in the population size of most zoological groups from organic (OL, OF) to mineral horizons (A, S), but OL and OF horizons varied as the most populated horizon according to years and animal groups. More animals and more animal groups were present at higher elevation, following an increase in food and habitat availability. 相似文献
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启发式教学方法是各种教学方法的灵魂,这种教学方法符合由感性到理性、由现象到本质的认识规律,融入了过程式教学思想。在C语言教学中利用启发式教学方法,能够充分调动学生学习C语言的积极性、主动性和创造性,引导学生通过自己的独立思考,融会贯通地掌握的C语言基础知识,并能从实际应用角度培养学生分析问题和解决问题的能力,增强自学能力和创新能力。基于启发式教学的基本思想,研究C语言教学过程中的启发式教学的具体应用方法。 相似文献
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Kjetil Bevanger 《Biological conservation》1977,11(1):67-78
Cartographic methods for the presentation of zoological data have been much neglected, mainly because there is a lack of classification systems relating to different animal communities. A classification system for bird communities in Norway, based on a hierarchical structure as used by the phytosociologists, is described. Five main communities are proposed at the class level. As an example, the forest community (Fringilla) is described down to the association level. Indices of preference are formulated for particular bird species in specified vegetation units and communities, together with a general knowledge of avian distribution and ecology. The ‘complete’ system will make it possible to read the corresponding bird community from the vegetation units in a vegetation map and to compare one bird community with another when assessing relative conservation values. The new system is intended to aid planning authorities who need up-to-date biological data for nature conservation and resource legislation. 相似文献
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Sandrine Salmon Nadia Artuso Lorenzo Frizzera Roberto Zampedri 《Soil biology & biochemistry》2008,40(7):1707-1715
This study investigated the responses of soil animal communities, soil functioning and humus forms to forest dynamics and solar radiation. We examined changes in invertebrate communities and soil features in two subalpine spruce forests (Eastern Italian Alps, Trento) growing on a calcareous bedrock, with different sun exposures (north and south), each forming a chronosequence of three developmental phases: clearing, regeneration stand (25-year-old trees) and mature stand (170-year-old trees). Our results indicate that the two forest sites differed in solar energy input, soil chemical properties and the relationships between forest dynamics and animal communities. In the north-facing site, soil fauna communities were very similar in the three forest developmental phases. Conversely, in the south-facing site, the composition of invertebrate communities and the diversity of zoological groups varied greatly among developmental phases. The highest abundance of total invertebrates, and mites in particular, occurred in the south-facing mature stands while the south-facing regeneration stand was characterised by higher densities of Collembola, Chilopoda, Symphyla, Protura and Aranea. The structure of communities in clearings was the same as in regeneration stands but with lower invertebrate abundance. Humus forms and soil features changed with developmental phases in both the south- and north-facing sites, although variations were more pronounced in the southern exposure. Mature stands were characterised by high levels of soil organic carbon and nitrogen, C/N values and low pH, the clearings and regeneration stands being characterised by a greater release of mineral nitrogen. The diversity of zoological groups (Shannon–Wiener index) was linearly correlated to soil pH, Humus Index, the amount of organic carbon and the species richness of herbaceous plants. Our results about the composition and the diversity of invertebrate communities are consistent with the observations of other authors studying south-exposed forests growing on different bedrock types, indicating that such relationships are widespread. The higher densities of invertebrates in the south-facing site may be attributed to higher solar radiation, and the positive correlation observed between total soil fauna abundance and solar energy supports the “more individuals” hypothesis that assumes a positive relationship between the number of individuals and energy availability. Possible ways by which forest dynamics control soil invertebrate communities are discussed. 相似文献
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案例教学法是目前教育教学领域研究的热点之一,该方法是将学生带入特定的教学情境中进行思考,以加深学生对抽象原理和概念的理解,有助于培养学生运用理论知识解决问题的能力和创新能力。结合研究生培养中计算机图形图像研究方向的实践情况,探讨了案例教学法在研究生创新教育过程中的必要性,并详细介绍了案例教学法的基本原理及具体应用。实践证明,案例教学法是一种新颖而且有效的教学方法。 相似文献
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J. Sabater Pi 《Biological conservation》1981,19(2):131-140
The gorillas of Rio Muni have been very heavily exploited in order to obtain specimens for zoological parks and research centres. During 30 months (September 1966 to February 1969) 34 young gorillas were shown to have been captured in Rio Muni: This figure was increased by 29 which were killed in the process of capturing the young; thus 63 were verified as having been eliminated from the wild during that time.Considering the heavy predation that these animals face in Rio Muni and in West Africa in general, in terms of live captures and animals killed for food, the only solution for their protection is the creation of National Parks and Reserves under strict control and international supervision.If this action is not carried out as soon as possible, the future of these extraordinary animals will be severely threatened. 相似文献
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互联网环境下应用文写作在写作工具、写作过程、思维方式、传递途径等多个方面均有差异。相应的,五年制高职应用文写作课堂教学内容和学生写作能力培养也应与时俱进,作出革新,以帮助学生适应现代社会对人的素质要求。 相似文献
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目前,以计算机网络技术和教育信息化发展为代表的教学资源的管理逐渐成为教育教学的重心。教师和学生对教学资源的需求日益迫切,教师高质量的备课和再学习等都离不开丰富的教学资源;学生拓展综合能力,提高信息素养,提高研究和解决问题的能力同样也离不开强大的资源平台。这样,就亟需建立一个教学资源管理平台,将教学资源进行信息化、科学化的分类,构成有组织的教学资源库,为使用者提供丰富的内容和优秀教学资源。 相似文献
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通过分析高职院校学生和农业机械课程的特点,探讨在教学过程中采取不同的教学方法,以期提高学生的学习兴趣和提高教学质量。 相似文献