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

新疆加工番茄抗黄瓜花叶病毒转基因技术的研究

作者： 张瑜   来源： 石河子大学 年份： 2010 文献类型 ： 学位论文 关键词： RNA干扰   系统进化树   黄瓜花叶病毒  

描述： bution, one of the pathogenicity impaired crops. It has three genomic RNAs. So it is one of RNA virus model strains to investigate pathogenicity mechanism in host.

全文：扩增黄瓜花叶病毒加工番茄NS04分离物的3个基因组部分序列,利用基因系统进化树分析发现基因组编码的四个蛋白：CMV-1a与日本的毒源AB179764同源性最高,核苷酸和氨基酸同源性分别为96.0

黄瓜与小麦和大豆轮作对土壤微生物群落物种多样性的影响

作者： 吴凤芝   王学征   来源： 园艺学报 年份： 2016 文献类型 ： 期刊 关键词： 大豆   土壤微生物多样性   黄瓜   小麦   轮作  

描述： 采用黄瓜与小麦和大豆轮作的方式,研究轮作对黄瓜土壤微生物群落DNA序列多样性的影响。结果表明,黄瓜与小麦和大豆轮作显著提高了土壤微生物多样性指数、丰富度指数和均匀度指数,两种轮作土壤微生物群落DNA序列相似程度高达0.5678,而与对照土壤间的相似程度分别为0.3465和0.3124。两种轮作处理的黄瓜产量也显著高于对照(P<0.05)。说明轮作改善了土壤的微生态环境。

我国古代的农田水利政策

作者： 盛家宝   来源： 治淮 年份： 2016 文献类型 ： 期刊 关键词： 宋会要   排水沟渠   灌溉工程   熙宁   兴水利   有应   施工安排   所在地点   食货   提刑  

描述： 州县的,各县都要提出意见,报送主管官吏;各县应修的堤防、开挖的排水沟渠要提出计划、预算和施工办法,报请上级复查,然

宁夏设施蔬菜连作障碍及综合防治技术研究

作者： 朱英   来源： 宁夏大学 年份： 2014 文献类型 ： 学位论文 关键词： 综合防治   影响因素   设施蔬菜   连作障碍  

描述： 设施农业是宁夏六大主导产业之一,种植面积由2005年的1.5万hm2迅速扩展到2013年的18万hm2,在引领现代农业发展、提升农业科技水平、增加农民收入等方面发挥了积极的作用。但随着宁夏设施作物连作时间的逐步延长,连作障碍现象日趋加重,严重制约了宁夏设施农业的可持续发展。解决设施农业连作障碍对保障

全文：研究结果如下： 1.设施瓜菜连作障碍因素 通过实地调研和室内分析,引起宁夏银川贺兰产业园与宁夏西吉华林公司万亩设施农业园区番茄连作障碍的主要原因是土壤次生盐渍化以及土壤结构的破坏；引起宁夏银川市兴庆区

石羊河流域主要农作物水分生产函数及优化灌溉制度的初步研究

作者： 李霆   来源： 西北农林科技大学 年份： 2005 文献类型 ： 学位论文 关键词： 动态规划模型   水分生产函数   非线性规划　   灌溉制度优化   缺水敏感指数  

描述： 当前,在水资源日益短缺,农业灌溉用水不能增加,而粮食需增收的背景下,如何将有限的灌溉用水在作物不同生育期优化配置,以及对作物进行精量灌溉控制,使灌溉效益最高,越来越成为农田灌溉领域的研究热点。本研究以甘肃省河西走廊石羊河流域为例,对其主要农作物的水分生产函数及灌溉制度优化模型作了初步研究,取得了以下

全文：以甘肃省河西走廊石羊河流域为例,对其主要农作物的水分生产函数及灌溉制度优化模型作了初步研究,取得了以下成果:　 1)　根据收集的有关试验资料,绘制了春小麦、春小麦-玉米带田、籽瓜、白兰瓜、棉花和亚麻

雍正朝西路军需补给研究

作者： 张连银   来源： 厦门大学 年份： 2007 文献类型 ： 学位论文 关键词： 西路   雍正朝   军需  

描述： 论文以清代西路军需作为研究对象，以粮食和牲畜为重点，运用历史学的实证法，兼以数据统计，考察雍正朝西路军需补给及河西驻军的军需补给。 全文由绪论、正文和结语三大部分组成，正文又包括六章。 绪论：界定研究对象“西路”、“军需”等概念，介绍了选题缘由及意义；回顾学术史；陈述运用的资料及研究方法。 第一章：

全文：研究对象“西路”、“军需”等概念，介绍了选题缘由及意义；回顾学术史；陈述运用的资料及研究方法。 第一章：探讨雍正朝陕甘行政区划的变迁，气候状况及甘肃八府二州县的社会经济状况，雍正朝陕甘的粮食储备

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：、廓、河、鄯、洮、岷、秦、成、渭、甘、肃、瓜、西州以及北庭都护府,趁机占有了唐朝的大片领土,陇右地区几乎全部被吐蕃占有,使唐后期的西部边界仅维持在陇山一线。从地缘政治的角度看,唐朝方面从高祖到玄宗开元

裕固族经济史

作者： 任正实   来源： 中央民族大学 年份： 2012 文献类型 ： 学位论文 关键词： 裕固族   游牧经济   经济史  

描述： 裕固族的祖先可以追溯到唐朝时期的回鹘汗国,由此又可追溯到公元前3世纪的丁零。研究裕固族经济史,丁零、高车、铁勒、回鹘经济研究是不可少的环节。从丁零到回纥汗国的建立,裕固族的祖先们经历了从原始氏族社会到家长奴隶制社会再到封建制社会的转变,但游牧经济一直是社会经济的主体部分。回鹘汗国内部实行封建性的赋税

全文：严重破坏了回鹘汗国的社会经济,最终导致其灭亡。 9世纪中期回鹘汗国灭亡后,有一部分回鹘人迁徙到河西地区,这些回鹘人散居在甘州、瓜洲、肃州等河西大部分地区,和原来迁入河西地区的回鹘人慢慢融合,逐步发展壮大并

中国古代害虫观念与防治技术研究

作者： 龚光明   来源： 南京农业大学 年份： 2010 文献类型 ： 学位论文 关键词： 观念   防治技术   农作物害虫   中国古代  

描述： 中国古代以农立国,农业丰歉直接关乎社会稳定、人类幸福。因此,农业害虫一直受到关注,人们不断探索、总结其规律及应对措施。在生产实践中,害虫观念、防治技术在继承的基础上不断发展与更新。不同时期害虫观念的变化对防治政策的制定及防治技术的实施产生深远影响。 古代农业害虫以蝗、螟、好蚄及未知名害虫为主,次数依

全文：更趋制度化。多次颁布法令,责成地方官于虫蝻生发时扑打、申报。并诏令州县正官通过翻耕或焚烧解决蝗卵问题,以防次年滋生蝗灾。陈旉从气的运行原理认为害虫是气的正常运行受到破坏、偏离常规所致。董煟则主张针对蝗虫