关键词
秦汉时期西部开发的地域差异与文化互动
作者: 邓燕平   来源: 江西师范大学 年份: 2007 文献类型 : 学位论文 关键词: 秦汉时期   地域差异   西部开发   文化互动  
描述: 秦汉时期出于政治统治和军事防御的需要,对西部地区实施了大规模的开发举措。这也是我国历史上西部大开发的第一个黄金时期。由于自然环境、民族族属、生活方式和文化习俗的不同,西部地区可分为西北与西南两个不同的区域。由此导致秦汉政府对这两个区域的治理政策和开发措施的差异。在西北地区为了边防的需要,治理政策主要
全文:秦汉时期出于政治统治和军事防御的需要,对西部地区实施了大规模的开发举措。这也是我国历史上西部大开发的第一个黄金时期。由于自然环境、民族族属、生活方式和文化习俗的不同,西部地区可分为西北与西南两个不同
文明传播视野下的汉代河西开发
作者: 刘俊玲   来源: 青海师范大学 年份: 2010 文献类型 : 学位论文 关键词: 河西   汉代   开发   文明  
描述: ral environments make the cultural dissemination possible. In archeological materials we can see plenty of Neolithic culture and Bronze culture,which may be nomads. Ywati, Wusun, Hun were lived here.Befor Han Dynastie ,the area was regarded as wild and woolly place.the Hun sprang up during Qin and Han Dynastie, Gansu Corridor became more and more imporant in military and politics affairs. After the establish of Western Han Dynasty ,the imperium rehabilitated for tens of years . Emperor han wudi change the plant to the Hun. I n the second year of yuanshou of Emperor han wudi(121BC),Huoqubing go on an expedition to Gansu Corridor,and wan,because the Hunye king killed the Xiutu king . The Hunye king surrenderred and leaded his man about 40000 .This is significant to the history of culture diaaemination. From then on,Han culture hold the dominant position in the war.The pattern of dissemination were war,politics and valueas.And the policy which Han made decision of the dissemination and the speed. After long time Interaction,the two change the hisroy of this area.Although some rejection and degradation happened,the new trail was certainty. Agricultural civilization took new tools to the area,and finally the Silk Road was freely.It made a contribution to culture dissemination.However,the aggressive e x p a n s i o n m a d e t h e immigrate and armies too huge,and led the crisis of ecologyand resource. Qiang civilians uprising during the Eastern Han Dynastie made the land desertificated. The process was not at one stroke,but a long time. Rely on force was to set up a unified ,multinational country.
全文:的,而是一个漫长的历史过程。汉代河西开发在很大程度上是靠武力来实现的,因此不免存在着代表先进生产力的强势民族对生产水平低下的弱势民族的压制,而总体上这种传播是文明的同化——一体化和统一的多民族国家的建构。
第九节 明代的开发
作者: 暂无 年份: 2017 文献类型 : 地方志
描述: 第九节 明代的开发
关中西部冬小麦最优灌溉时期的研究
作者: 黄梦琪   郝红科   来源: 杨凌职业技术学院学报 年份: 2016 文献类型 : 期刊 关键词: 产量   灌水量   冬小麦   灌水时期  
描述: 不同时期灌水对冬小麦的产量有显著影响,适时适量灌水对提高冬小麦的产量具有重要意义,实验结果表明冬小麦冬灌应在11月底到12月份较适宜,春灌应在2月下旬到3月上旬较适宜。灌水量冬灌应控制在750~900m3/hm2,春灌600~750m3/hm2。灌溉定额应控制在1 350~1 650m3/hm2。
明清时期三陇地区的农田水利研究
作者: 康小兰   来源: 西北师范大学 年份: 2009 文献类型 : 学位论文 关键词: 三陇地区   农田水利   明清时期  
描述: in agriculture. In recent years, the Western Development Drive (WDD) has been carried out, however, the problem of lack of water has still not been solved fundamentally.
全文:我国的西北地区自古就是一个干旱、半干旱区,缺水是这一地区农业面临的最大困难。近年来,西部大开发已经轰轰烈烈地开展了,然而缺水的问题仍然没有从根本上得到解决。中国历史源远流长,在古代,西北地区的先民们
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:位于河西走廊东部的石羊河流域是河西三大内陆河流域之一,其军事地理位置重要,历代中央王朝和割据于此的地方势力都十分重视对本区的开发。明清时期,随着西北战事再起,加上这一时期全国人口数量的急剧增长,为了
西部干旱地区农户旱地种植行为实证研究
作者: 叶晶晶   来源: 南京农业大学 年份: 2010 文献类型 : 学位论文 关键词: 农户   旱地   水资源   决策   干旱风险  
描述: ncentrated v}}ith 85% of the total dry lands. and it is important for the national economy and the countr<0's strategic agricultural growth. Northwest arid areas basically depend on natural precipitation. water shortage has seriously affected the farmers practices. The decision of farmers to plant dry land is a two-stage decision-making behavior: They first have to decide whether to plant dry land, and then decide what kind of crops planted in the dry lands. It is essential to find effective ways to raise the enthusiasm of farmers planting and reasonable arrangements for dry land crop structure. However. ver}} few people study dry land farming practice from the perspective of water shortages.
全文:旱地农业生产关系到我国的粮食安全,旱地占全国耕地面积的60%,集中有全国85%旱地的北方地区更是成为了国民经济和国家农业增长的战略要地。西北干旱地区旱地灌溉基本上是以自然降水为主,干旱严重影响了农户的旱地种植行为,农户的早地种植决策是两阶段决策行为:他们首先要决定是否种植旱地,然后再决定在旱地上种植何种作物。研究干旱地区影响农户种植旱地的因素有利于寻求有效的途径来提高农户种植积极性和合理安排旱地作物结构是十分必要的,但是很少有人从水资源短缺的角度对农户的旱地种植行为进行研究。 基于以上背景,本文选择了水资源短缺比较明显的甘肃省张掖市民乐县为研究区域。文章通过干旱条件下分析影响农户种植决策的影响因素,对农户是否种植旱地的初始决策和如何选择旱地作物种类的二次决策进行实证分析,从而为提高农户种植积极性和指导农户合理安排旱地作物种植结构提出有效的政策建议。 全文分为五章:第一章是绪论,首先介绍了研究背景和问题的提出,然后阐述了研究的目的和意义,以及研究方法和技术路线;第二章主要介绍了本文涉及的重要理论基础和相关文献回顾。理论基础主要包括农户风险投资行为理论。文献综述包括水资源风险相关研究、农民风险偏好的相关研究、农户投资决策行为和影响农户决策的相关因素等内容;第三章首先回顾了甘肃省农业生产自然条件,然后分析了研究区域张掖市民乐县的水资源利用情况,最后对该区域的调查资料做了一个简单的描述。第四章首先根据前人的理论成果经过提炼提出了本文的研究假说,然后介绍了模型的选择和变量的定义,分析了变量的预期影响效果,然后分别利用二元选择Probit模型和多元排序选择Ordered Probit模型对农户是否种植旱地的初始决策和如何选择旱地作物种类的二次决策进行实证分析。分析发现,非农收入、土地产权、人均耕地面积在两个模型中都是显著的。土地肥力只对农户初始决策产生显著影响,地块数量、农机具价值、户主文化和年龄、地区分类变量对农户选择旱地作物种类的影响是显著的。第五章在实证分析的基础上进行总结,并提出了相关的政策建议。
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:发展。 为了更好的体现理论结合实践的原则,在论文的最后以甘肃龙源生态营地为例,对甘肃黄河中上游生态脆弱区环境改善的方法进行阐述,期望本论文能使甘肃黄河中上游乃至整个西北环境恶劣的地区,在今后的环境治理中,能起到指导和借鉴作用,以此,改善西部地区脆弱的生态环境,促进西部地区经济又快又好的发展。
宁夏黄灌区种植业节水潜力与开发途径
作者: 张惠   来源: 中国农业大学 年份: 2005 文献类型 : 学位论文 关键词: 节水潜力   宁夏黄灌区   开发途径   种植业  
描述: 论文针对宁夏黄灌区用水量超标的的问题,采用调查分析、分析预测、评议论证、实证分析等方法,就宁夏引黄灌区水资源利用现状,进行了水资源利用评价,提出了灌溉农业在水资源利用上面临的主要问题,在此基础上研究分析了宁夏黄灌区种植业节水途径及可推行的综合节水模式。主要结果如下: 1.引黄灌区水资源缺乏,农业用水
全文:分析了宁夏黄灌区种植业节水途径及可推行的综合节水模式。主要结果如下: 1.引黄灌区水资源缺乏,农业用水面临危机。黄河为宁夏主要灌溉水源,现在宁夏引黄分配份额为40亿m~3,当地水资源总量为2.8亿m
开发利用发酵残渣改良盐碱土的研究
作者: 张金龙   王振宇   张清   来源: 农业环境科学学报 年份: 2016 文献类型 : 期刊 关键词: 发酵残渣   盐碱土改良剂   小麦   土壤改良  
描述: 施用量,不能超过30 000 kg.hm-2,施用量过高将增加土壤盐分;盐碱土改良剂能明显增加土壤有机质、水解氮、速效磷含量,提高土壤肥力;施用盐碱土改良剂提高了小麦产量,小麦最高增产达1 249.5 kg.hm-2,但不同施用量之间差异不显著。
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