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甘肃黄河中上游生态环境脆弱区的保护和开发
作者: 王亚聪   来源: 西安建筑科技大学 年份: 2009 文献类型 : 学位论文 关键词: 西部大开发   脆弱生态环境   环境伦理学   生态可持续发展  
描述: s getting worse, which threats the environment for humanity's living.
全文:的生态环境相伴生,而脆弱的生态环境区主要位于我国的大西北地区,近些年来,自然灾害时常发生,北方的沙尘暴,黄土高原的水土流失,森林的过度砍伐,土地沙漠化的扩大等等,都极大的影响了该地区的社会经济
甘肃省黄河沿岸地区水资源承载能力分析
作者: 刘建兰   来源: 兰州大学 年份: 2010 文献类型 : 学位论文 关键词: 甘肃省   沿黄地区   水资源   承载能力   系统动力学  
描述: th, the demand of water resource is continuously increasing. That is to say water shortage has become a global problem. Water resources carrying capacity is the basis and prerequisite of regional socio-economic development, which is significant to realize the coordinated development of regional "water resources- ecological environment-socio-economy" composite system. So it has become the focus and hot topic in water science field nowdays.
全文:半干旱向干旱过渡的地带。这里也是我国西北地区的地理要冲,自古以来就是沟通西域与内地的咽喉所在,为著名的古丝绸之路的必经之地。这里集中了全省主要的现代工业力量和科技教育资源,已成为甘肃乃至西北地区经济增长
甘肃省黄河沿岸地区水资源承载能力分析
作者: 刘建兰   来源: 兰州大学 年份: 2010 文献类型 : 学位论文 关键词: 甘肃省   沿黄地区   水资源   承载能力   系统动力学  
描述: th, the demand of water resource is continuously increasing. That is to say water shortage has become a global problem. Water resources carrying capacity is the basis and prerequisite of regional socio-economic development, which is significant to realize the coordinated development of regional "water resources- ecological environment-socio-economy" composite system. So it has become the focus and hot topic in water science field nowdays.
全文:半干旱向干旱过渡的地带。这里也是我国西北地区的地理要冲,自古以来就是沟通西域与内地的咽喉所在,为著名的古丝绸之路的必经之地。这里集中了全省主要的现代工业力量和科技教育资源,已成为甘肃乃至西北地区经济增长
明清时期石羊河流域农业开发与环境变化研究
作者: 栾晓丽   来源: 陕西师范大学 年份: 2010 文献类型 : 学位论文 关键词: 石羊河流域   农业开发   明清时期   环境变化  
描述: In history;the central and local separatist all valued the development of this area. During the Ming and Qing Dynasties,with the renewed fighting in the northwest, coupled with the rapid growth of the national population, In order to consolidating border defense and detenting Mainland population pressure,the land development of this area resumevted,which impacted histoy development of this area very profoundly Academic research in this area is more included in the academic research for the whole Hexi area or the entire northwest region, special articles in this area are also mainly concentrated in the lower reaches of Shiyang River, but these research the upper, middle and lower reaches of the river as a whole rarely,the connection among the three is.very close essentially.So this object has larger space to continue researching. This text includes introduction and body text.the introduction introduces the writing causes ,implication,and retrospects intellectual history, explains research objectives,Methods and important and difficult points of this object at the same time.The body text divides into six chapters.The first chapter analyzes the natural conditions and social infrastructure in this area.The second chapter mainly deals with immigration status which Ming and Qing government organize and encourage the population in the mainland move to this area,which provides manpower resources for agricultural development in this area,and this chapter discusses effectiveness of the immigration.The third chapter discusses construction of water conservancy which agricultural development requires,and summarizes pearls and pitfalls of water conservancy construction in this area during this period.The fourth chapter mainly deals with agricultural development in this area during the Ming and Qing dynasties,This chapter begin by the reasons for agricultural development and policies which the government urge and offer for, discusses region of agricultural development, reclamation success and evolution of tonden in this area during this time.The fifth chapter mainly discusses environmental problems that because of large-scale development in this period,and analyzes performance, hazard and measures that local people inoder to protecting the environment had taken.The sixth chapter summarizes experience and lessons those because of large-scale development in this period during this time,and explains inspiration for today's development. Research of this object is primarily based on literature of the Ming and Qing Dynasties and local records, and notes data that through field visits get, in order to make the discussion Speci.ficly and reasonably.
全文:巩固边防、缓和内地人口压力,本区的土地开发再一次兴起,这对本区的历史发展产生了深远影响。 学术界对本区的研究多包涵在对整个河西地区乃至整个西北地区的研究当中,专门研究本区的文章也主要集中在下游地区
西北旱作农区农作制优先序研究
作者: 成敏   来源: 西北农林科技大学 年份: 2010 文献类型 : 学位论文 关键词: 西北旱作农区   BP神经网络   农作制优先序   抗旱减灾对策?  
描述: est region, which c ombined with the water-saving, agricultural soil and water conservation techniques, and then taken " drought resistance, reduce erosion, increase efficiency" as a principle.
全文:本文针对西北地区降水资源短缺、旱灾频发、土壤侵蚀严重和农村经济贫穷落后的现状,结合已有的旱作节水、农田水土保持等单项技术,以“抗旱、减灾、增效”为原则,通过实地调研,并结合已有技术成果的分析、农户
清代河西走廊土地利用及其环境效应
作者: 张钰   来源: 西北师范大学 年份: 2009 文献类型 : 学位论文 关键词: 河西走廊   土地利用/土地覆被的变化   环境效应   历史地理  
描述: f the earth's surface.Therefore,it has great benefit for clarifying the mutual action between human beings and land and their change principles in the historical period when the land use and the land cover changes are chosen as the study perspective.
全文:的研究工作被迅速提上日程。 河西走廊地处祖国大陆腹地,曾是西北地区经济发展的一颗璀璨的明珠,创造了辉煌灿烂的走廊文明。然而明清以降,人们对土地资源肆意开发利用,并且日益演化为一系列生态问题,由于这些
1933-1945年甘肃经济建设研究
作者: 裴庚辛   来源: 华中师范大学 年份: 2008 文献类型 : 学位论文 关键词: 1933—1945   甘肃商业   甘肃工业   甘肃金融业   甘肃农业  
描述: 近代甘肃经济落后,农业生产仍是传统的耕作方式,产量低下;工业则没有几家近代工厂,主要是手工业工场或家庭手工业作坊,新式工业尚处于起步阶段。再加上灾荒频发,烟毒横行,地方当局借禁种之名行罚款之实。甘肃人民生活困苦不堪。与落后的经济水平相对应,近代甘肃的金融机构主要有票号、钱庄(银号)、当铺等几种形式,
全文:逐步扩大,国内外贸易均有长足发展。战时商业发展的特点为抗战时期传统商路的变迁,西北地区与西南地区间商贸往来的日益密切。西北地区各省间贸易力度的加大,对苏易货贸易的发展及银行业对商业发展的示范效应和负面影响。
隋唐时期青海草原战争与生态环境研究
作者: 来霞霞   来源: 陕西师范大学 年份: 2010 文献类型 : 学位论文 关键词: 生态环境   吐谷浑   吐蕃   青海草原  
描述: t Territories distributed a few mature Minority forces,for example: TuYuhun, Tibet, Party items.
全文:隋唐时期是我国历史上的重要时期,中央王朝一度开疆扩土,而此时在西北地区,也分布着几支成熟的民族势力:吐谷浑、吐蕃、党项等。隋朝初期,吐谷浑趁隋朝无暇顾及之机,经常寇扰隋朝西北边境。隋炀帝即位后,西征
甘肃省干旱气候灾害对气候变化的响应
作者: 王燕   来源: 兰州交通大学 年份: 2009 文献类型 : 学位论文 关键词: 甘肃省   干旱气候灾害   气候变化   响应  
描述: 以变暖为主要特征的全球气候变化对西北地区气候和生态环境的变化有着广泛而深远的影响。在全球变暖的背景下,甘肃省干旱气候灾害有愈演愈烈之势。气候变化对甘肃省干旱气候灾害有着显著影响。 本文利用由国家气候中心提供、课题组(2005DIB3J100)整编的气候要素观测资料、干旱灾情资料,查阅相关文献典籍,探
全文:以变暖为主要特征的全球气候变化对西北地区气候和生态环境的变化有着广泛而深远的影响。在全球变暖的背景下,甘肃省干旱气候灾害有愈演愈烈之势。气候变化对甘肃省干旱气候灾害有着显著影响。 本文利用由国家气候
干旱半干旱地区农田灌溉节水治理模式及其绩效研究
作者: 刘涛   来源: 南京农业大学 年份: 2009 文献类型 : 学位论文 关键词: 灌溉   效率   用水者协会   制度建设   自主治理  
描述: the world's resource is 6%, but the average water resource to the world's average level is just 1
全文:中国面临着严重的水短缺问题,尤其是西北干旱半干旱地区。我国淡水资源总量占全球水资源的6%,但人均占有量仅为世界平均水平的1/4、美国的1/5,在世界上名列121位,是全球13个人均水资源最贫乏的国家
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