甘肃农业大学农耕特色库

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农史小札: 作者： 游修龄 来源： 中国农史 年份： 2016 文献类型： 期刊 关键词： 农书生活史甫里先生文集蝶类柑桔凤蝶游修龄飞翔能力浙江农业大学《齐民要术》土壤科学; 描述： 农史小札游修龄（浙江农业大学农史室）一、说泥和土王云森教授著《中国古代土壤科学》一书中，对古代的“土”和“壤”两个字的含义，作了明白清楚的区分，并对中国古代土壤科学的内容展开详细论述。笔者注意到书中对古代汉字中与水稻关系密切的“泥”字，一直未有提及。...

曹魏两大政治集团论析: 作者： 王建明 来源： 山东大学 年份： 2009 文献类型： 学位论文 关键词： 曹魏政治集团汝颍谯沛; 描述： Group headed by Cao Cao, Shuzhong Group led by Liu Bei, Jiangdong Group led by Sun Quan. The political bloc led by Cao Cao had the most abundant strength and talents came forth in large numbers. During the long-term expedition two major factions within formed: Ru一Ying Group and Qiao Pei Group. Ru-Ying Group charged civil service mainly and Qiao Pei Group was mainly made up of generals. These two groups had a long-term punitive expedition since Cao Cao fought against Dong Zhuo. Finally they unified vast areas of Northern China and carried out fruitful management, which avoided serious damage in the region by a long war and laid a good economic, political and military foundation for the unification of China in the future. Cao Cao fought against Dong Zhuo at the beginning, seizing Yanzhou, Zhangxiu, Xuhuai, Guandu, the four states, Wuhuan and Jingzhou, beat the seemingly invincible powerful opponents one after another. His forces got stronger and stronger. The two major political groups of Cao Wei supported Caocao on political and military aspects. Because these two groups represented the interests of their own, inevitably buried hidden dangers of can get on well with in adversity but can not share wealth. Ru-Ying Group is represented by the family of Han who was in the name of safeguarding the rule of the Eastern Han dynasty but to protect their interests. They can support Cao Cao's domination, but resolutely oppose his taking over Han dynasty. Qiao Pei Group on behalf of Cao Cao's family numbers who wished to gain greater benefits through Cao Cao's taking over Han dynasty. AD 209 years, The Battle of Red Cliff, which was Cao Cao's great cause of reunification of the most important ended in failure. As the highest strategic staff groups, Ru Ying Group throughout the campaign process simultaneously inconceivable aphasia, and the army of Cao Cao was defeated. Cao Cao became unable to dominate the country again in the rest of his life. This result was what Sun Quan, Liu Bei would like to see, Ru Ying Group was also willing to see it. From the historical records there was no record of staff at the Advanced Medium's death to give people the impression that Ru-Ying Group seemed to have known the defeat in advance. When Cao Cao was still alive, Qiao Pei Group holded the upper hand. But after the death of Cao Cao, Ru-Ying Group strongly supported Cao Pi to be the king. Finally Chen Qun put forward "Jiupinzhongzheng system", which established the family of Han's political monopoly. The two major political groups gradually moved towards a balance. After the death of Wei Ming King, the two major political groups split from co-operation, eventually formed a situation of endless immortality. Cao Shuang and He Yan of Qiao Pei Group were launched by Sima Yi through Gaopingling case when the situation was good. Sima Yi killed Cao Shuang and holded military and political power in the country. He cruelly blowed members of the Group Qiao Pei through a series of charges against them. Then, Jin Dynasty took place Wei. Ru-Ying Group obtained a comprehensive win. While Qiao Pei Group after its three generations with a heavy heart exit stage of history.; 全文：战乱对这一地区的严重破坏,为日后中国的统一打下了良好的经济、政治和军事基础。从曹操自伐董卓始,夺兖州、征张绣、平徐淮、战官渡、定四州、征乌桓、占荆州,击败了一个又一个貌似强大不可战胜的对于,势力

渭河平原县域农田土壤养分肥力空间特征研究: 作者： 李志鹏 来源： 西北农林科技大学 年份： 2014 文献类型： 学位论文 关键词： 土壤养分空间变异性地统计学养分肥力时空变化; 描述： 渭河平原地势平坦，气候温和，土壤肥力水平主要受土壤养分含量的影响。本研究选取渭河平原腹地，素有“白菜心”之称的兴平市作为研究区，基于GIS技术支持平台，综合运用传统统计学、数理统计、地统计学等方法，结合“3414”田间肥效试验结果和1980s第二次土壤普查的珍贵历史数据集，研究兴平市农田土壤有机质、; 全文：生态环境建设、精准农业的发展，测土配方项目的推进提供科学依据和理论指导。本研究的主要结果：（1）目前，兴平市农田土壤养分含量表现为：13项农田土壤养分属性指标的变异系数介于23.56%~74.87

干旱半干旱地区农田灌溉节水治理模式及其绩效研究: 作者： 刘涛 来源： 南京农业大学 年份： 2009 文献类型： 学位论文 关键词： 灌溉效率用水者协会制度建设自主治理; 描述： the world's resource is 6%, but the average water resource to the world's average level is just 1; 全文：中国面临着严重的水短缺问题,尤其是西北干旱半干旱地区。我国淡水资源总量占全球水资源的6%,但人均占有量仅为世界平均水平的1／4、美国的1／5,在世界上名列121位,是全球13个人均水资源最贫乏的国家

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