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特邀美国特洛伊大学于克伟博士来校作学术报告

日期:2016-06-23 来源:duohuo 浏览:789

报告题目:A Biogeochemical Approach to Mitigate Soil Greenhouse Gases 

报告人:Dr. Kewei Yu(Department of Biological & Environmental Sciences Troy University, Troy, AL, USA) 

报告时间: 6月24日 14:00 

报告地点:学科1号楼S205 

主持人:徐德福 教授 

报告人简介: 

Dr. Yuke Wei目前是特洛伊大学副教授,已获得终身教职,已发表四十余篇SCI收录论文,论文h指数11,自2003年起担任土壤学领域知名SCI期刊Archives of Agronomy and Soil Science编辑,目前是该刊副主编。他的工作履历如下: 

Associate Professor   2014 - present   Troy University, USA 

Assistant Professor   2009 - 2013   Troy University, USA 

Senior Researcher   2001 - 2008   Louisiana State University, USA 

Research Assistant   1998 - 2000   Louisiana State University, USA 

Assistant Professor   1994 - 1998   Institute of Applied Ecology, China 

Visiting Scientist   2015   The University of Melbourne, Australia 

Visiting Scientist   1996 and 1994   University of Copenhagen, Denmark 

Research Associate   1991 - 1994   Institute of Applied Ecology, China 

目前研究兴趣:Global climate change and greenhouse gases ,Wetland biogeochemistry ,Water quality 

报告摘要: 

After carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) are the most significant atmospheric trace gases contributing to the greenhouse effect. While atmospheric concentrations of CH4 and N2O are generally lower relative to CO2, their global warming potentials, or the capacity of a unit mass of the substance to heat up the atmosphere, are higher by a factor of 23 and 300 respectively. The two most important sources of N2O are through nitrification of ammonia under aerobic conditions and denitrification of nitrate under moderately reducing conditions. On the other hand, CH4 formation, or methanogenesis, in soils generally occurs under intensely reducing conditions characterized by permanent or long term flooded conditions. Redox, the intensity of oxidation or reduction, in soils is characterized by the redox potential (Eh). Wetlands, such as rice fields, shift between an aerobic and anaerobic environment, making this system a potential CH4 source during flooded periods and a N2O source during unflooded periods. This study determined the Eh range that would minimize the production of CH4 and N2O thereby reducing the global warming potential of a broad range of soils. In addition, this study explored what redox-related soil characteristics govern the dynamics of this Eh window. Results show that a window of redox conditions exists, which will minimize the impact of wetland systems on global warming. Initial organic matter and sulfur content, and release of degradable organic material to the soil have significant influences on the timing for each soil to reach or maintain that redox window. 

大气环境与装备技术协同创新中心 

江苏省大气环境监测与污染控制研究重点实验室 

江苏省大气污染控制联合实验室 

江苏省环境净化材料工程技术研究中心 

环境科学与工程学院 

2016年6月21日