U.S.-Korea Cooperative Research on Nitrogen Fixation by Free-living Blue-green Algae (Cyanobacteria) in Flooded Rice Paddies

美韩合作研究淹水稻田中自由生活的蓝绿藻（蓝藻）固氮

• 批准号: 8807729
• 负责人: G-Yull Rhee
• 金额: $ 2.25万
• 依托单位: Health Research Incorporated/New York State Department of Health
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-04-01 至 1991-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8807729&HistoricalAwards=false
• 关键词: U.S.; Korea; Cooperative; Research; Nitrogen

This proposal requests funds to permit Dr. G-Yull Rhee, Health Research, Inc., Center for Laboratories and Research, New York State Department of Health, to pursue with Dr. Jeuson Maeng, Department of Biology, Sogang University, for 24 months, a program of cooperative research on nitrogen fixation by free-living blue-green algae (cyanobacteria) in flooded rice paddies. The collaborators will investigate (1) seasonal distribution and succession of nitrogen-fixing blue-green algae, (2) seasonal changes in nitrogen-fixing activity, and (3) the effect of light and phosphate on growth and nitrogen-fixing characteristics of three unialgal isolates of the most prominent nitrogen fixing blue-green algae in flooded rice paddies. The occurrence of nitrogen fixers in rice paddies is of ecological as well as economic interest because they contribute a significant amount of nitrogen to the nitrogen budget of the paddies. The distribution and nitrogen-fixing activity of these organisms in the flooded paddy ecosystem vary with climatic factors such as light and temperature, pH, the chemistry of the soil and irrigating waters, and agricultural practices such as tillage, fertilization, and the application of pesticides. Thus, their ecology and their economic importance in rice fields may vary widely with geographic region, from a temperate to tropical climate. Few investigations of these algae have been made in a climate such as that of Korea. The information obtained in this study is important for (1) evaluating the extent of nitrogen fixation by free-living blue-green algae and the potential for utilizing them to improve the nitrogen fertility of temperate-zone rice paddies and (2) the general understanding of the algal competition and succession, and the impact of human interference such as fertilizer and pesticide application on species interactions in rice paddies. This interference in rice paddies may be comparable to the effects of eutrophication and chemical pollution in the aquatic environment. This study also will provide the basis for a comparative study of algal ecology in temperate and tropical zone paddies. The collaborators are highly respected scientists in the field of this research who have collaborated successfully in the past. The present project will allow them to combine their talents and interests for mutual benefit. This project is relevant to the objectives of the U.S.-Korea Cooperative Science Program which seeks to increase the level of cooperation between U.S. and Korean scientists and engineers through the exchange of scientific information, ideas, skills, and techniques and through collaboration on problems of mutual benefit. Korean participation in the project is supported by the Korea Science and Engineering Foundation (KOSEF).

该提案要求资金允许纽约州卫生局实验室和研究中心Health Research，Inc。的G-Yull Rhee博士与Sogang University生物学生物学系Jeuson Maeng博士一起工作24个月，这是一项合作研究计划，以固定氮气固定的合作研究计划，该计划是通过免费生活的蓝绿色Algeen Algeen Algeen Algeen algeeN Algeen Algee（Cyananobacter）（Cyananobacter）（cyanabacter）。 The collaborators will investigate (1) seasonal distribution and succession of nitrogen-fixing blue-green algae, (2) seasonal changes in nitrogen-fixing activity, and (3) the effect of light and phosphate on growth and nitrogen-fixing characteristics of three unialgal isolates of the most prominent nitrogen fixing blue-green algae in flooded rice paddies. 稻田中的氮固定器的发生既具有生态感兴趣又具有经济利益，因为它们为帕迪（Paddies）的氮预算贡献了大量氮。 这些生物在被洪的稻田生态系统中的分布和固定活性随气候因素（例如光和温度，pH，pH，土壤和灌溉水的化学性）以及农业实践（例如耕作，肥料，肥料，施肥和农药的施用）而变化。 因此，从温带气候到热带气候，它们的生态和在稻田中的经济重要性可能因地理区域而异。 在韩国等气候下，很少对这些藻类进行调查。 这项研究中获得的信息对于（1）通过自由生活的蓝绿色藻类评估氮固定程度很重要，以及利用它们来改善温带区域稻田的氮肥力，以及（2）对藻类竞争和继承的一般理解，以及对人类互动中的人类互动和帕切德疗法的影响。 稻田的这种干扰可能与水生环境中富营养化和化学污染的影响相媲美。 这项研究还将为温带和热带区域藻类藻类生态学的比较研究提供基础。 在这项研究领域，合作者是过去成功合作的科学家。 本项目将使他们能够将自己的才能和利益结合起来，以获得相互利益。 该项目与美国 - 库里亚合作科学计划的目标相关，该计划旨在通过交流科学信息，思想，技能和技术以及关于互惠率问题的协作来提高美国和韩国科学家和工程师之间的合作水平。 韩国参与该项目的参与得到了韩国科学与工程基金会（KOSEF）的支持。