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香根草是一种高大的、簇生成丛的禾本科多年生草本植物,也是一种优良的热带牧草,香根草有很多用途,特别是在作为一种廉价而有效的,并且有利于生态环境的抗击土壤侵蚀的工具方面发挥着很重要的作用。目前香根草已被世界上100多个国家列为理想的水土保持植物种之一。香根草生态工程技术也曾被国际评估委员会评为全世界71项持续发展技术中最为优秀的项目,受到热带、亚热带地区的政府、科学家和使用者的高度重视,已在这些地区的山坡地水土保持、路基护坡、海滩和河岸固土以及污染治理等领域广泛应用。本文将重点介绍我国香根草种质资源领域的研究现状,同时对目前存在的一些问题进行分析说明,为将来我国香根草种质资源的开发利用提供一定的参考。 相似文献
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香根草根系深2~3m,已被世界上许多国家列为理想的水土保持植物种,也是受重金属和有机物污染土地复垦的首选物种之一,其香根油还有重要的经济价值。我国大面积存在的天然香根草群落位于广东省湛江地区,现存面积150hm^2左右,建议应尽快把这块仅有的野生香根草草地划为自然保护区,为国内外研究者提供一个天然香根草的研究基地。 相似文献
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我国大陆唯一的大面积成群落分布的优良水土保持植物--香根草的用途与保护问题 总被引:24,自引:5,他引:24
香根草根系深2-3m,已被世界上许多国家列为理想的水土保持植物种,也是受重金属和有机物污染土地复垦的首选物种之一,其香根油还有重要的经济价值。我国大面积存在的天然香根草群落位于广东省湛江地区,现存面积50hm^2左右,建议应尽快把这块仅有的野生香根草草地划为自然保护区,为国内外研究者提供一个天然香根草的研究基础。 相似文献
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施肥对香根草定植缓苗期影响研究 总被引:4,自引:0,他引:4
香根草(Vetiveria zizanioide)是禾本科岩兰属多年生草本植物。原产于东南亚,印度和非洲,是理想的水土保持绿篱植物,其地上部簇生成丛,等高密植能形成致密的绿篱带,拦截被冲刷的泥沙和地表径流,深达2~3m的须根系统可牢固地固持土壤,并能吸收一般作物无法吸收到的深层土壤水分和养分。目前,世界上有100多个国家和地区在栽培和利用香根草。我国南方各省从1988年以来一直在推广种植香根草篱作为水土保持措施,具有很大的发展前景。但香根草定植后缓苗期较长,初期长势弱,尤其是在贫瘠的坡地上,严重影响其水土保持的效果。 相似文献
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香根草在我国的研究简史及应用进程 总被引:1,自引:0,他引:1
详细综述了香根草技术在我国发展的简史、香根草在我国的自然分布概况、以及在水土保持、提高农作物产量、环境保护、经济利用以及其他等方面的应用和研究,并对香根草的应用研究前景提出一些建议,希望能更好地推广和利用香根草,以提高其生态和经济效益。 相似文献
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皇草是由中国热带农科院热带牧草中心从哥伦比亚引进的象草与美洲狼尾草杂交选育而成的新品种。 1 998年 ,经全国牧草品种审定委员会审定通过 ,正式审定登记为热研 4号皇草。又叫杂交狼尾草 (四川叫皇竹草 )。目前 ,除南方地区种植外 ,北方部分地区也开始栽培利用 ,表现良好 ,是一种很有饲用价值的高产优质牧草。1 特征特性皇草是禾本科多年生单性繁殖草本植物 ,一般不开花结实 ,茎、根扦插栽培 ,种质不易退化 ,一次引种 ,多年利用。栽培当年 ,大部分须根分布在 0~30cm的土层中。茎秆坚硬粗壮 ,圆形 ,茎粗 1~2cm。株高 4~ 5m ,不倒… 相似文献
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Beran GW 《Preventive veterinary medicine》2008,86(3-4):198-207
When early people made their appearance, zoonotic infectious diseases were already waiting, but epidemic diseases did not appear in human history until people began to live in large numbers under conditions of close contact, mainly during the last 10,000 years. Disease has decimated urban populations, conquered armies, and disrupted society. The focus here is on (1) the plague of Athens and the Black Death; (2) smallpox, influenza, and rabies; (3) avian influenza prion diseases, and foot & mouth disease; and (4) emerging and re-emerging diseases. All have veterinary public health associations. In Athens, Greece, in 430 BC, when the Spartans ravaged the countryside, hordes crowded into Athens so that orderly movements, space in which to live, and adequate supplies of food became impossible. Crowding of any population fosters disease transmission; chaos and disorder enhance it all the more. Out of northern Egypt came a terrible plague from across the Mediterranean Sea. The identity of the plague of Athens remains unsure, but the well-considered conclusion is Rift Valley Fever, a mosquito borne, viral zoonosis. The Black Death, also called the Plague, raged in Asia for centuries. In 1347, the Black Death was brought by a ship out of Asia to Sicily. The scenes of devastation were repeated throughout Europe, with 90% or more of the people dying in city after city. Influenza, too, has been a cause of periodic human epidemics, but the great pandemic of influenza occurred in the last months of World War I. In the years of highest occurrence, more than half the world's population became clinically infected. If veterinary public health had been born earlier, it could have led to elucidating the epidemiology of influenza and the plagues of Athens, Europe, and Asia. In turn, smallpox had also caused continual tragedy. In 1796, Edward Jenner began to harvest pustules of cowpox from children or infected cows and inject them into susceptible children. In 1980, the World Health Organization declared that smallpox had been eliminated from the world. Rabies, though, still strikes terror. A number of animal diseases, broadly termed emerging and re-emerging diseases, need surveillance because they have the potential to impact human health. From late in 2003 to 2007, the highly pathogenic H5N1 influenza virus in poultry infected at least 121 people and caused 62 deaths in four countries. The prion diseases, too, all have very high numbers in concentrated contacts. To control these diseases, veterinary public health is essential, with diagnosis, epidemiological surveillance, clinical manifestations, and prevention as primary measures. 相似文献
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Dekker A Dercksen D Snoep J van Wuyjckhuise L 《Tijdschrift voor diergeneeskunde》2007,132(18):695-701
On 26th of july 2007 a new case of bluetongue was notified in the Netherlands and on 2nd of august 2007 foot-and-mouth disease was diagnosed in Surrey, England, which raised the threat of having both infections simultaniously in one area. Bluetongue and foot-and-mouth disease have a different pathogenesis, but symptoms may resemble each other at a later stage of infection. The pathogenesis and possible clinical symptoms of both infections are discussed and illustrated with pictures. 相似文献
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在动物的异常行为中以刻板行为最为常见,而咽气癖又是马最常见的口部刻板行为之一。作者就咽气癖在生理方面和心智方面对马体产生的影响、行为基础、诱因的研究进展及常见的防治措施进行综述。 相似文献
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近几年,世界饲用添加剂市场增长较快,预计今后将进一步增长,据世界粮农组织(FAO)首领会议的倡议,到2015年,将使世界营养不良的人口削减一半,其间,肉制品将会以每年2%的速度增长,特别是加快猪肉和禽肉增长。这将促进世界添加剂,尤其是蛋氨酸和赖氨酸需求量的增加。 相似文献
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