共查询到19条相似文献，搜索用时 234 毫秒
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黄河三角洲已成为东方白鹳重要的繁殖地,从2005年有2对东方白鹳在黄河三角洲自然保护区大汶流管理站湿地恢复区内成功繁殖5只幼鸟开始,到2011年8月调查结束,共有89对东方白鹳成功繁殖幼鸟235只。在未来保护行动中应加强东方白鹳数量动态监测,开展繁殖栖息地选择研究,实施越冬地保护措施,吸引社区参与管理,保护东方白鹳及其生存环境。 相似文献
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黄河三角洲自然保护区东方白鹳的繁殖保育 总被引：7，自引：0，他引：7
东方白鹳是国家I级、全球性易危鸟类。2005年,东方白鹳在黄河三角洲自然保护区繁殖成功,证实黄河三角洲自然保护区在保护这一珍稀、濒危物种方面的重要性。为保护这一重要繁殖地,本文作者对东方白鹳繁殖行为进行了观察,分析影响东方白鹳繁殖的因素,提出科学保护的措施。 相似文献
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指出了白腰鹊鸲是广泛分布于南亚和东南亚的雀形目鸣禽,其鸣声清脆悦耳,但目前中国还没有关于白腰鹊鸲的繁殖生态学研究。白腰鹊鸲繁殖期间是利用已有洞资源来筑巢的次级洞巢鸟,通过放置人工竹筒巢及繁殖期的观察,对白腰鹊鸲的巢址选择、窝卵数、卵情况、繁殖失败因素等进行了调查研究。结果表明:白腰鹊鸲的繁殖季为每年的3月下旬到7月下旬,繁殖高峰期为4~6月份;白腰鹊鸲窝卵数一般为4枚,单枚卵重3.18±0.27g;白腰鹊鸲一个完整的育雏周期为26±2 d,其中孵化周期为15±1 d,育雏周期为11±3 d。巢材的植物包括14科18属20种,主要营巢材料包括羽叶金合欢(Acacia pennata)、托叶黄檀(Dalbergia stipulacea)、铁刀木(Senna siamea)。巢址距道路最近距离为20.72±16.34 m,距离房屋最近距离为31.29±19.11 m,巢高为1.27±0.4 m。白腰鹊鸲巢失败的主要因素为巢被捕食。 相似文献
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M. Hubbes 《Forest Pathology》1973,3(3):163-168
The seasonal fluctuation in the production of coremia by Ceratocystis ulmi (Buis.) was studied on elm stem discs taken from trees felled in April, June, July, September, October and November 1971 at Valcartier, Quebec. More coremia formed on stem discs of trees felled during the growing season. Except for trees felled in October and November, more coremia formed on sapwood than on heartwood. Evidence obtained during the study showed that the compounds, which trigger coremia formation, are not uniformly distributed within and between trees or throughout the period from April to November. 相似文献
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对昆明动物园内干香柏树上营巢的野生小白鹭进行研究,测算其最低适宜营巢枝干和实际最低营巢枝干占树高的百分比,并检测两者的差异显著性。结果表明,实际营巢高度与适宜营巢高度占树高百分比存在显著差异,可能因为亲鸟为避免来自地面的干扰,选择离地较高的位置繁育后代。通过分析坠落鸟巢的构成材料,发现其由268根植物枝条构成,其中91%为干香柏,与主要营巢树一致,说明此地可能由于提供丰富的营巢材料而被鹭群选择成为繁殖地。建议公园积极加强野生涉禽的科学管理,降低繁殖区内及周边的干扰。 相似文献
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历山自然保护区30种鸟类繁殖特性及成效的研究 总被引：2，自引：0，他引：2
１９９３年—１９９７年的４月—９月，对山西省沁水县中村地区，３０种鸟类的自然繁殖特性及成效进行了观测研究。５年共观测到营巢成功巢１５０窝，产卵成功巢１０７窝，离巢成功巢８６窝，巢外育幼成功巢５６窝，成功率分别为８３．８０％，７１．３３％，８０．３０％和６５．１１％。影响鸟类繁殖成效的主要因素是人为活动的干扰。 相似文献
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We investigated whether partial cutting used to mimic small-scale natural disturbances could maintain cavity and bark nesting breeding birds. We assessed changes in the relative abundance of cavity nesting birds in two intensities of partial cutting, compared to uncut and clearcut stands, 9 years post-treatment. We then examined the relationship between forest structure and nesting abundance (stand scale) and compared characteristics of used nest and forage trees to unused trees (tree scale). The relative abundance of most species was highest in either heavy removal or light removal treatments 9 years post-harvest. Brown creepers were most abundant in uncut, and red-breasted sapsuckers were most abundant in clearcut and heavy removal treatments. The proportion of deciduous trees and the density of dead trees were the best predictors of nest abundance. Individual nest tree use was predicted by the presence of large deciduous trees with broken tops and early to advanced stages of decay. Forage tree use was predicted by the presence of large conifer trees in advanced stages of decay. To maintain breeding habitat for cavity nesters, we suggest that forest managers retain the specific structural attributes required for nesting, but also the diverse forest conditions required for foraging. 相似文献
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2011年3～5月使用直接观察法对微山湖新薛河湿地内的鸟类巢穴进行调查,共发现鸟类巢穴90个,其中喜鹊Pi-ca pica巢36个,池鹭Ardeola bacchus巢54个,其他鸟类的巢穴2个。对影响鸟类巢址选择的因素进行了分析,结果显示距水源的距离、营巢树高和营巢树是影响喜鹊巢址选择的主导因子,次要因子是巢距地面高度、距公路的距离和人为干扰状况,再次是巢分支数;距公路的距离、巢距地面的高度、营巢树胸径和营巢树高是影响池鹭巢址选择的主导因子,次要因子是距水源的距离、人为干扰状况和巢分支数。 相似文献
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A histological investigation of Oriental beech wood decayed by Pleurotus ostreatus and Trametes versicolor 
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下载免费PDF全文 Chemical, light and electron microscopic studies were carried out on wood of Oriental beech (Fagus orientalis Lipsky) decayed by the white‐rot fungi Pleurotus ostreatus and Trametes versicolor for 30, 60 and 120 days according to the modified European standard EN 113. Mass loss as well as lignin, cellulose and carbohydrate content were determined before and after fungal attack. There were no significant differences of wood mass loss and chemical composition between both fungi at the end of incubation. After each incubation period, small specimens were stained for microscopic studies. The micromorphology of fungal cell wall degradation was rather similar for both fungi. Both decreased the cell wall thickness to the same extent. The accumulation of hyphae as well as the rupture of cell walls was also similar. The occurrence of hyphae, cavities in the pits and vessel walls followed nearly the same patterns. The parenchyma cells were completely destroyed. Altogether, both fungi produced a simultaneous white rot in Oriental beech wood. 相似文献
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D. B. Lindenmayer R. B. Cunningham M. T. Tanton A. P. Smith H. A. Nix 《Forest Ecology and Management》1991,40(3-4):289-308
A total of 1125 hollow-bearing trees was observed for the presence of arboreal marsupials in the montane ash forests of the Central Highlands of Victoria, south-east Australia. Different species of arboreal marsupials exhibited preferences for hollow-bearing trees with different characteristics. Gymnobelideus leadbeateri (Leadbeater's possum) selected short, fat trees with numerous holes and a large quantity of dense surrounding vegetation. Very large hollow-bearing trees were favoured as nest sites by Petauroides volans. Petaurus breviceps preferred trees with a large number of fissures, whereas trees favoured by Antechinus stuartii were tall and thin. Trees selected as nest sites by Trichosurus caninus were typically short and fat with few holes. Our results provide evidence of resource partitioning of hollow-bearing trees amongst arboreal marsupials. Clear-felling of montane ash forest on an 80–120-year rotation will have a highly detrimental effect on arboreal marsupials by substantially reducing the number and range of types of hollow-bearing trees required to support the complete diversity of species. The 80–120-year interval between logging operations will result in trees being harvested well before they develop characteristics which make them suitable nest sites for arboreal marsupials. 相似文献