关键词
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:土地利用是人类活动作用于自然环境的主要途径之一,是导致地表变化的主导因素。因此,以历史时期土地利用、土地变化作为研究视角对明晰各历史时期人地互动及其变迁规律大有裨益。20世纪90年代中期
清代甘肃黄土高原的土地利用
作者: 刘维   来源: 陕西师范大学 年份: 2009 文献类型 : 学位论文 关键词: 清代   农业技术   土地制度   甘肃黄土高原   土地资源  
描述: ainly chooses three aspects, the quantity and quality of farmland, the land system and agricultural technology, to analysis the fact that the land system, the land utilization patterns and the selection of agricultural technology are constrained by natural environment and land resources, accordingly reveal the main-land relationship which is influenced by natural environment. The thesis is composed of four parts.
全文:文的研究区域作一界定,并对该区清代行政建置的变化作了说明;其次,从地貌、土质、气候等方面,阐述了本区土地利用的自然地理条件,并简要分析了这种条件对土地利用的影响。 第二部分论述甘肃黄土高原土地资源的数量
清代甘肃黄土高原的土地利用
作者: 刘维   来源: 陕西师范大学 年份: 2009 文献类型 : 学位论文 关键词: 清代   农业技术   土地制度   甘肃黄土高原   土地资源  
描述: ainly chooses three aspects, the quantity and quality of farmland, the land system and agricultural technology, to analysis the fact that the land system, the land utilization patterns and the selection of agricultural technology are constrained by natural environment and land resources, accordingly reveal the main-land relationship which is influenced by natural environment. The thesis is composed of four parts.
全文:文的研究区域作一界定,并对该区清代行政建置的变化作了说明;其次,从地貌、土质、气候等方面,阐述了本区土地利用的自然地理条件,并简要分析了这种条件对土地利用的影响。 第二部分论述甘肃黄土高原土地资源的数量
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:的夏季旱涝特征进行了分析,在此基础上,分析了甘肃省干旱气候灾害对气候变化的响应。本文主要结论如下: (1)甘肃省干旱灾害发展至今有着它存在的自然和人文因素。甘肃省远离海洋,使得水汽输送受限,降水稀少且年
灾害与应对
作者: 张健   来源: 陕西师范大学 年份: 2009 文献类型 : 学位论文 关键词: 安康地区   清代   自然灾害   应对措施  
描述: significance.
全文:。灾害形成主要有自然和社会两方面因素,其中以社会因素为主导。自然原因表现在气候、地貌、地表状况、河流水文等方面,社会原因则主要表现为“流民”涌入改变了清代安康地区的人口增长与分布状况,垦殖政策的实施
阐释的可能
作者: 胡晓丹   来源: 中国美术学院 年份: 2009 文献类型 : 学位论文 关键词: 宋代   文人茶   阐释   文本   符号学  
描述: Tea Drinking is so important a event not only in China's traditional culture, but also as a classic subject of art history.
全文:、引入新的视野;同时也阐明了开放式的结论:“文人茶”作为一个延续至今的传统文化概念,通过阐释方式的变化,不断赋予新的涵义。以次作为今后更深入和多层面研究的起点。
阮籍隐逸思想研究
作者: 赵辉   来源: 河北师范大学 年份: 2009 文献类型 : 学位论文 关键词: 首阳山赋   隐逸   竹林七贤   阮籍   命世大贤  
描述: 政局、社会风尚和士人心态的继续推进,竹林七贤内部和整个士人阶层都在发生着变化,隐逸思想的转变是一个重要的
全文:政局、社会风尚和士人心态的继续推进,竹林七贤内部和整个士人阶层都在发生着变化,隐逸思想的转变是一个重要的体现,而其中最有代表性的人物就是阮籍。 在政局动荡的漩涡中,阮籍的隐逸思想不断变化,从早期的儒家到
明清时期巢湖流域农业发展研究
作者: 陈恩虎   来源: 南京农业大学 年份: 2009 文献类型 : 学位论文 关键词: 农业经济   农业发展   明清   巢湖流域  
描述: 区域农业经济研究是目前经济史研究的热门课题,至今已有许多成果问世。相对而言,巢湖流域农业经济的研究较为滞后,并且研究领域和成果比较分散,尚未形成全面、系统的研究体系,其主要原因应当是学术界常常会以明清时代的巢湖流域与全国其他区域相比不具备“典型性”为由,漠视了对巢湖流域的经济研究。因此,努力填补明清
全文:)巢湖流域农业发展变迁为研究对象,探讨明清时期巢湖流域人口和农作物种植结构、亩产水平的变化,农田水利兴修和土地资源的开发利用与生态环境变迁之间的互动关系,土地占有形态、租佃关系的发展演变和农村社会
魏晋南北朝北方地区生态环境研究
作者: 武冠芳   来源: 山西大学 年份: 2009 文献类型 : 学位论文 关键词: 生态环境   魏晋南北朝   北方  
描述: ecological environment sometimes changed the process of the history of society" .
全文:生态环境是人类社会发展的最重要的自然条件之一,“生态条件的变化,在一定意义上有时曾经改变了社会史的进程”。研究中国历史时期的生态环境及生态环境变迁对历史进程的影响,具有重大理论和现实意义。 本文主要
唐代西北地区政治地理格局变动研究
作者: 魏昀   来源: 陕西师范大学 年份: 2009 文献类型 : 学位论文 关键词: 唐朝   疆域   羁縻府州   屯田   交通  
描述: th about three of culture and materials the country's territory changed a lot. The country's territory was in an extending period before and the An-Shi Armed Rebellion, and once extended to the Central Asia area.At the same time, the Tang government founded the Ji-Mi-Fu-Zhou system in the Western Regions. The situation changed rapidly when the An-Shi Armed Rebellion broke out. Then the central government mobilized the troops in the Western Regions to participating in putting down the Rebellion, so the border defence was weakened. Tu-bo took the chance to occupy a large amount of territory. Almost Long You Area was oppupied by Tu-bo later in Tang Dynasty. The thesis is divided into five chapters: political geography circumstance in northwest area in early Tang Dynasty,including the situation of physical geography and the nation regime; the political geography situation in the extending period of territory from Tai Zong to Gao Zong;the political geography situation in the stable period of territory from Wu-zhou era to An-Shi Armed Rebellion;the political geography situation in the shrinking period of territory after An-Shi Armed Rebellion;relationship between the change of political geography situation and economy and traffic. Conclusion: From A.D. 7th to 9th century,Asia-Erope Continent was a place where Tang, Da-shi and Tu-bo contended for political space. The country's power of politics, economy and military strengthened before An-Shi Armed Rebellion, and part of the Central Asia area belonged to Tang government. The territory reached to an unparalleled scale at that time, which can be divided into three parts: the capital area where Chang-an and Luoyang were located in was the empire's center of politics, culture and military; the Zheng-zhou that around the captals was where the finance of central government stemmed from; the Ji-mi-fu-zhou system Tang government founded in the frontier area was the military buffer zone with nation regimes in vicnity. At the same time, Tu-bo appeared in the stage of history in A.D 7th century. After the King Song-zan-gan-bu unified the Tibet plateau, Tu-bo's power strengthed rapidly and harassed Tang's frontiers inceasingly. The Tang government put the defense police actively into effect so as to resist Tu-bo's aggression and defend country's benefit in Long-you area. When An-Shi Armed Rebellion broke out, Tu-bo took the chance to occupy vast territory of Tang Dynasty, like Minzhou, Lanzhou, Kuozhou, Guazhou, and so on. Eventually, almost all Long-you areas belonging to Tang Dynasty was occupid by Tu-bo. In the field of geopolitics, the national power strengthened in the earlier stage of Tang Dynasty and stronger than Tu-bo. Tu-bo didn't have the strength contending with Tang Dynasty, even harassed the frontier once a while. Until the An-Shi Armed Rebellion, the Tang government had no more advantage and the national power was weakened.
全文:唐代是中国历史上的鼎盛王朝之一。唐王朝近三百年历史,在创造了无与伦比的物质和精神文明的同时,国家的疆域也发生了剧烈变化。以安史之乱为界,唐前期,国家的疆域处于一个不断扩展的时期,唐王朝的势力范围
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