按文献类别分组
关键词
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
唐代前期河西州县城城防研究
作者: 张向红   来源: 西北师范大学 年份: 2010 文献类型 : 学位论文 关键词: 河西州县城   唐代前期   城防  
描述: ch as the important town of the Silk Road, multi-ethnic coexistence and the border district administrative center. In order to ensure normal exchange between the East and the West, frequent contact among ethnicities, and effective administration in He-xi area, it was extremely essential to establish city defense. Therefore, the Tang government built the city defense system that was mainly military defense and based on social balance. Mainly included the screen protective system of Army, Shouzhuo, City, Town, Shu, etc., which had some focal point and very wide and located out of the cities; Three layers external protective system that was composed of a deep ditch to round every city, sheep and horses cities, city wall; Multiple structure system such Luo city(outer city), Zi city(inner city), fang(residential area), Shi(markets), and so on; Garrison inside cities and out of locality system; Feng, Yi and other information systems; General's office person of ability system; Warehouse reserve and social balance system. Because of the important geographical position strategic and the special social security problem, the He-xi Prefecture and county city defense had formed Trinity characteristic with the national defense and the security defense. The city defense soldiers had a hand in Tuntian to bring about He-xi area’s agricultural advance; A large number of people of city defense formed the consumer market, had promoted the prosperity of the commerce; The city defense ensured traffic and military assistance, made He-xi Prefecture and county cities become the rear base to administer Central Asia. However, the city defense had its limitation, such as impotent military might at times (it offered an opportunity of Tibetan expanded in north-west area), because of the condition between the country and the locality. It, to a certain extent, had influenced on the valid function of city defense.
全文:唐代前期,在西北地区特殊的社会环境下,河西州县城体现出丝路重镇、多民族共处地、边地行政中心等诸多特征。为保证东西方正常交流、多民族之间的频繁交往以及唐在河西地区的有效统治,城防之设极为必要。因此,唐
甘肃城乡协调发展问题研究
作者: 魏丽莉   来源: 兰州大学 年份: 2010 文献类型 : 学位论文 关键词: 城乡关系   甘肃   双重滞后  
描述: 改革开放的30年也是中国整个社会经济结构剧烈变动的30年。在各种结构变动中,城乡关系及其结构变动是所有结构变动中的核心表现。如何正确处理好不同区域城乡关系及其协调发展,建立健全城乡互动机制,具有重大的战略意义。进入2000年后,在快速推进城市化的同时,城乡关系尤其是欠发达地区城乡如何协调发展已成为人
全文:的战略意义。进入2000年后,在快速推进城市化的同时,城乡关系尤其是欠发达地区城乡如何协调发展已成为人们关注的重大问题。 城乡失衡的巨大差异将中国当前城乡关系分为以下三种类型:一是强城市强农村,区域
宋代荒政研究
作者: 魏伟   来源: 山东大学 年份: 2010 文献类型 : 学位论文 关键词: 仓储改革   灾荒   荒政思想   荒政  
描述: There are direct and indirect damage to human society which caused by natural disasters.
全文:自然灾害对人类社会的危害,有直接性的,即灾害本身所具有的巨大冲击力直接造成生命的死亡和生态的破坏,也就是通常人们所说的“灾”;也有间接性的,即灾害通过造成农作物的减产绝收间接地影响人们的生活和正常
震后重建中村落生产—生活空间的整治模式研究
作者: 王懿娜   来源: 天津大学 年份: 2010 文献类型 : 学位论文 关键词: 震后重建   村落   产业结构   空间布局   防灾减灾  
描述: isasters in China, the earthquake caused the largest number of deaths accounted for 54% of the total number, and 80-90% of China's earthquake occurred in rural areas.
全文:。我国农村地区范围广、人口多、、基础建设差、抗灾能力低等因素,致使地震的侵袭给农村带来及其严重的危害。为了在震后快速有效地进行农村地区震后重建工作,尽快恢复震后农村地区的正常生活和生产,同时提升震后村落
酒泉市特色农业产业发展研究
作者: 伍小玲   来源: 兰州大学 年份: 2010 文献类型 : 学位论文 关键词: 酒泉市   特色农业产业   制约因素  
描述: stics of the basic conditions for the development of agricultural industry in Jiuquan City and, the situation of and constraints in the development of featured agricultural industry, aiming at seeking an approach to futher develop the featured agricultural industry in the city of Jiuquan.
全文:不强、制度建设缓慢以及不断恶化的生态环境等因素成为酒泉市特色农业产业持续快速发展的瓶颈问题。 第四,提出加大科技、资金投入、大力开展农民技能培训、加快农村土地承包经营权流转和全面发展高效节水农业等突破
农杆菌介导的抗寒基因转化羽衣甘蓝的初步研究
作者: 张文玲   来源: 西南大学 年份: 2010 文献类型 : 学位论文 关键词: 抗寒转录调控基因TCF   羽衣甘蓝   甜菜碱合成基因BADH   转基因植株  
描述: siea. Low temperature is the key factor that limits the growth, colour and appreciatability in winter in the northern of China. Introducing foreign gene into kale through genetic engineering may create novel variety with cold tolerance. In this study, BADH(encoding betaine aldehyde dehydrogenase) and TCH(encoding transcription regulation factors) were used to be transformed into kale with Agrobacterium-mediated transformation.
全文:个羽衣甘蓝品种 通过对不同激素配比的培养基上,9种基因羽衣甘蓝的带柄子叶、下胚轴、真叶的再生情况进行比较分析,从中筛选出皱白1,06-56和05-25这3种高效再生基因,其最适培养基分别为
山丹马场休闲农业资源与休闲游憩活动规划研究
作者: 刘松杨   来源: 河北农业大学 年份: 2010 文献类型 : 学位论文 关键词: 休闲农业资源   活动规划   山丹马场   休闲游憩活动  
描述: Leisure agriculture in China is now developing gradually and the benefit has increased every year.
全文:活动、硬件设施、旅游行程进行休闲游憩活动的规划。主要结论如下: (1)休闲农业资源是所有能够投入休闲活动的农业生产、农民生活以及农业生态等要素的总和,它具有生产性和季节性、地域性、知识性、生态性、审美性
草田轮作在黄土高原丘陵沟壑区旱作农业中的作用研究
作者: 曹利民   来源: 兰州大学 年份: 2010 文献类型 : 学位论文 关键词: 可持续发展   草田轮作   循环农业模式  
描述: duction in the area is restricted by disadvantageous natural resources and environmental conditions, including low arable land area per capita, frequent drought events and a landscape dominated by mountains. Forage crop rotation systems could improve soil fertility, increase crop外eld and provide quality forage supplies for livestock production. Additionally, their adoption is considered a suitable means to advance sustainable agriculture development. In this study, the role and status of forage crop rotations in Tianshui city were studied.
全文:,对草田轮作在旱作农业中的作用和地位进行了分析,调研了该区草田轮作推广的模式和分布区域,获得如下主要论点: (1)对甘肃省天水市旱作农业区生产条件和现状分析,草田轮作是适合该区农业生产条件的一种科学
吐鲁番史前彩陶研究
作者: 吕明明   来源: 新疆师范大学 年份: 2010 文献类型 : 学位论文 关键词: 史前   彩陶   吐鲁番  
描述: According to the basicly materials of the prehistorical painted pottery in Turfan, and by means of stratification and typology.
全文:的彩陶数量最大,因此作为本文的分析重点。通过划分洋海彩陶的不同类、、式,揭示出洋海彩陶的兴起、发展、衰落的过程;展示了洋海彩陶器形和花纹的鲜明特点。通过对吐鲁番史前其他的墓地出土彩陶与洋海墓地彩陶的对比
< 1 2
Rss订阅