不同耕作措施对麦—豆轮作条件下土壤有机碳库的影响

作者： 毕冬梅   来源： 甘肃农业大学 年份： 2009 文献类型 ： 学位论文 关键词： 碳素有效率   耕作措施   碳库管理指数   土壤有机碳库   轮作  

描述： 本文以甘肃农业大学定西旱农综合试验站的长期定位试验为基础,对麦-豆轮作次序下不同耕作措施间的土壤有机碳、易氧化碳、微生物量碳以及水溶性有机碳的含量进行了测定,计算了土壤碳素利用效率和碳库管理指数在

全文：的直接原因。 本研究结果说明,轮作结合保护性耕作有效地降低了传统种植制度对土壤有机碳的衰减效应,对土壤有机碳含量的影响是显而易见的,土壤活性有机碳对调节土壤养分流有很大影响,对土壤耕作措施的反映很明显。其中NTS处理显著增加土壤有机碳含量,更有利于土壤有机碳的累积。

阿克苏绿洲种植制度演变规律及发展对策

作者： 鱼静   来源： 新疆农业大学 年份： 2009 文献类型 ： 学位论文 关键词： 演变规律   发展对策   种植制度   阿克苏绿洲   驱动力  

描述： rategic adjustment of structure in agriculture and rural economics, work relating agriculture, rural areas and farmers remains top priority. Especially in China's accession to the WTO and national implementation of the western development strategy, the market-oriented agriculture, the process of internationalization for Aksu oasis agricultural production has brought greater opportunities and challenges.

全文：粮食安全进行评价与预测、深入研究阿克苏绿洲种植制度演变发展对策,为阿克苏绿洲建立合理可持续发展的种植制度提供了依据。研究结果表明: (1)自1978年以来,阿克苏绿洲种植业结构逐渐由以粮为纲向粮、经二元结构

中国古代土壤改良技术研究

作者： 陈凡学   来源： 南京农业大学 年份： 2009 文献类型 ： 学位论文 关键词： 中国古代   农业技术   土壤改良  

描述： eat attention to adopting various techniques to improve soil quality when plowing the soil, so that the soil could keep sustainable fertility and high rate of yield.

全文：、种植、盐碱土改造等措施,来改良土壤。中国古代土壤改良建立在一定的理论基础之上,这包括古代对土壤结构与性状的认识、“地力可变”的思想、“地力常新壮”的学说以及土壤“治之得宜,皆可成就”的理论。古代在土壤

植物河道水流特性和稳定河相关系研究

作者： 王燕   来源： 中国海洋大学 年份： 2009 文献类型 ： 学位论文 关键词： 仙农熵   水流特性   生态河流   根系加固   河相关系  

描述： made for economic prosperity. At the same time, some man-made natural disasters have been paid more and more attentions , so the research on hydraulic characteristics of the river in recent years has been put on the agenda. Considering the ecological environment, flood control, pollution prevention and control method, and in view of the perspective of the urban landscape as well as the national strategic plan for sustainable development, the research the hydraulic characteristics of river and making river reasonably repair and ecological reconstruction will become a general trend, because that is a kind of remediation measure for human to be done unreasonable exploitation, and it also will be the strong protection of river resources and sustainable model for better using river resources in the future.

全文：污染角度,还是从城市景观的角度,乃至从国家可持续发展的战略部署考虑,研究河流的水力特性,使河流能够得到切合自身特点的生态修复都是大势所趋,是对人类前期不合理开发河流的补救措施,也是今后继续利用河流资源

清代康雍乾时期的民食安全研究

作者： 周全霞   来源： 江南大学 年份： 2009 文献类型 ： 学位论文 关键词： 民食   康雍乾时期   粮食安全  

描述： roblem at all times and in all over the world.

全文：因素方面,先分析中国所处的宏观地理状况,进而具体分析康雍乾时期特有的地理环境;社会因素方面,从清代人均耕地面积的变化、经济作物的广泛种植、非生产性消费与民食的阶层分配差距等角度一一展开论述,提供了一个

中国古代农业灾害防减体系研究

作者： 邵侃   来源： 西北农林科技大学 年份： 2009 文献类型 ： 学位论文 关键词： 农业灾害史   农业灾荒文献   减灾技术   灾荒赈救   灾害预防  

描述： n the 1920s when China was called “the Land of Famine” by an American relief worker, the phrase immediately gained currency.

全文：民在承受各种灾害打击的同时,也开始了认识灾害、防治灾害的探索和实践,采取了各种积极的措施防灾抗灾,取得了巨大的成就,主要表现在救荒制度建设和减灾技术进步两个方面。本文以历史时期的抗灾救荒活动为基本

中国古代农业灾害防减体系研究

作者： 邵侃   来源： 西北农林科技大学 年份： 2009 文献类型 ： 学位论文 关键词： 农业灾害史   农业灾荒文献   减灾技术   灾荒赈救   灾害预防  

描述： n the 1920s when China was called “the Land of Famine” by an American relief worker, the phrase immediately gained currency.

全文：民在承受各种灾害打击的同时,也开始了认识灾害、防治灾害的探索和实践,采取了各种积极的措施防灾抗灾,取得了巨大的成就,主要表现在救荒制度建设和减灾技术进步两个方面。本文以历史时期的抗灾救荒活动为基本

中国古代农业灾害防减体系研究

作者： 邵侃   来源： 西北农林科技大学 年份： 2009 文献类型 ： 学位论文 关键词： 农业灾害史   农业灾荒文献   减灾技术   灾荒赈救   灾害预防  

描述： n the 1920s when China was called “the Land of Famine” by an American relief worker, the phrase immediately gained currency.

全文：民在承受各种灾害打击的同时,也开始了认识灾害、防治灾害的探索和实践,采取了各种积极的措施防灾抗灾,取得了巨大的成就,主要表现在救荒制度建设和减灾技术进步两个方面。本文以历史时期的抗灾救荒活动为基本

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

中国北方地区节水农作制度研究

作者： 王婧   来源： 沈阳农业大学 年份： 2009 文献类型 ： 学位论文 关键词： 北方地区   节水   节水技术   节水农作制度   种植模式  

描述： ium between the grain production and water resource: the drought and the irrigation area in northeast china, the drought and the irrigation region in Huanghuaihai area, the drought and the irrigation area in northwest china.The article analized the characteristic of water using of the main crops and the main cropping systems, compared the economic benefit of the water-saving planting patterns, studied the economic benefit, the water-saving benefit and participatory farmers survey results etc. of the water-saving technologies.

全文：节水种植模式的产量与节水效益,分析各区主要节水技术的节水效果、经济效益与参与式农民调查结果,主要结论如下: (1)东北灌区面临的主要问题是如何提高农业水资源的利用率,主要通过节水技术的应用与推广来实现