关键词
古代游记的农史价值研究
作者: 徐臣攀   来源: 西北农林科技大学 年份: 2007 文献类型 : 学位论文 关键词: 畜牧及渔业   林木与花卉   种植业   农业环境   古代游记  
描述: 论文对游记的概念进行了界定、对其起源与发展情况作了探究。认为游记是介于历史与文学之间的一种文体,其以记实、准确为基础,又不乏感情的流露;古代游记起源于先秦、形成于秦汉、晋魏南北朝、发展于隋唐五代、宋、元并且繁荣于明清;它反映的地域极为广泛,就国内来说西至西域诸国,东南可达南海地区;游记中大量有关自然
全文:类、文学类游记中的涉农资料较为少见;游记农事资料总体上讲具有真实性、地域性、时段性、多样性和零散性等特征。 本文对游记中的农业史料进行了分类整理,并且就游记资料在研究农业生产环境、种植业、林木与花卉
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:了以资源节约高效利用、抗旱减灾为主的农作制以及合理有效的抗旱减灾对策。主要得出以下结论: (1)通过在甘肃天水、定西、平凉、庆阳地区,宁夏银南地区、固原地区,陕西宝鸡、咸阳、渭南、铜川、延安、榆林
庆阳地区糯玉米品种筛选及栽培技术研究
作者: 陈红   来源: 西北农林科技大学 年份: 2005 文献类型 : 学位论文 关键词: 筛选   模式化栽培   糯玉米   应用  
描述: 玉米是庆阳地区仅次于小麦的第二大类作物,种植历史悠久,生产面积较大,分布范围广泛。但是在玉米生产中,长期以来,以普通型玉米为主,品种类型比较单一、生产技术落后、产量水平较低,尤其是鲜食和加工用玉米品种基本处于空白状态,生产附加值较低,难以满足社会、经济对玉米产品的多种需要,严重影响着该地区农业经济结
全文:高效农业的兴起,使人们对玉米的利用由传统的粮食作物转变为经济作物,这就迫切需要优化玉米种植业内部结构。因此改良玉米品种类型,发展优质专用玉米,是促进本地区玉米生产发展的根本出路。 本论文从引进优质糯玉米
历史时期青海地区自然灾害与区域社会经济发展研究
作者: 刘雯   来源: 西北农林科技大学 年份: 2009 文献类型 : 学位论文 关键词: 青海地区   自然灾害   历史时期   社会效应  
描述: e distinctive features in Western and Eastern of Qinghai's natural disaster in history which based on the historical materials and studied the Interaction Relationship Between the natural disasters and social-economic development, we used the theory and analysis method from the research area of disaster history and agricultural history, try to have a comprehensive investigation between the natural disasters and social-economic development in the history of Qinghai. Firstly, we divided Qinghai into two parts: the eastern and the western, under the study of the geographical features of Qinghai. We summarized the natural disaster of the eastern part mainly as flood, drought, hailstone and frost with distinctive features of variety, continuity and growth accompany while the western is mainly as earthquake and snow disaster with distinctive features of unexpected and severity. Secondly , as the great influence on agriculture and the resulting changement in agriculture is most profound, so the progress in agriculture sciences is related to withstand the natural disaster in some ways. The paper discussed the natural disasters affected Qinghai's agriculture in history, from the aspect of seed selection 、 production 、 processing and storage to invest the development of mitigation techniques in this area. And for the livestock we investigated in two sides bred of livestock and prevention of livestock, furthermore we invested the mitigation techniques which full of geographical characteristics. Thirdly, the article investigated the relationship between natural disasters and the economic fluctuation in Qinghai from the perspective of the change in population and grain price. And then, we analyzed the influence on regional industrial structure from the aspect of expansion in rural areas, the relationship between agriculture and animal husbandry, disaster-relief crop introduction and the structure of animal species. In the view of pastoral economic exchange, we studied the interaction relationship between the natural disasters and economic development. Finally, we studied the interaction relationship between the natural disasters and social development in Qinghai. What is more, we analyzed the policy which includes grain storage, relieved and help the people in disaster , reduced taxes to control the disaster in history. We wish these could be helpful to the prevention and control of natural disasters in Qinghai today.
全文:很大程度上与抵御自然灾害相联系。文章探讨了历史时期青海地区的农业灾害情况,从选种、生产、加工、储藏的角度对该地区种植业减灾技术的发展进行了考察,对畜牧业则从畜种选育和畜疫防治的角度进行了分析,此外还
陕西省农业现代化对农民增收的关系研究
作者: 雷婷   来源: 西北农林科技大学 年份: 2010 文献类型 : 学位论文 关键词: 陕西省   农民增收   农业现代化  
描述: e’ stability.This paper sets Shaanxi province as an example,hope to find the main factors affecting the income of peasants and their contribution in the system of the agricultural modernization, so as to identify the means of raising income of farmers from the view of the agricultural technology.
全文:模型,进行参数估计,得出陕西省农业现代化系统对农民增收的贡献率为8%,其中投入水平、产出水平的贡献率分别为33%和18%,而生产条件水平对农民增收的贡献率为-4%。各因素系数之和为0.4小于1,说明陕西
宁南旱区应变型种植制度的机理与技术体系构建
作者: 王龙昌   来源: 西北农林科技大学 年份: 2001 文献类型 : 学位论文 关键词: 机理   应变型种植制度   决策系统   技术体系-   干早   旱区农业  
描述: 旱地农业在我国和世界农业生产中都占据十分重要的地位,随着人口增长,人类面临的食 物短缺、水资源危机及环境恶化的形势更加严峻,旱地农业发展受到广大旱区国家高度重视, 并在早区农作制度研究方面取得许多重大进展。 宁南旱区地处黄土高原西北端,属黄河中游黄土丘陵沟壑区,旱作农田占总耕地面积的 90%。该区气
全文:了旱区农作制度的主要发展趋势, 并提出本研究的基本思路。第二章对宁南旱区农业资源与环境状况予以分析,揭示了宁南旱区 农业生产的基本特征及种植业发展态势。第三章对宁南旱区降水基本特征与干旱发生规律进行
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