7月1日：The Implications of Growing Bioenergy Crops on Water Resources, Carbon and Nitrogen Dynamics

主讲人：Atul Jain 教授

主持人：周旭辉 教授

开始时间：2016-7-1（周五）上午9:00

讲座地址：资环楼435会议室

主办单位：生态与环境科学学院 科技处

报告人简介：

Atul Jain is a Professor in the Department of Atmospheric Sciences at the University of Illinois. Dr. Jain's research focuses on understanding how interactions among the climate system alter the carbon cycle, and to provide useful projections of future changes in global carbon and resultant future climate change. His research goal is to provide the required scientific understanding about how the components of Earth's climate system interact; it is motivated by the practical and pressing issue of human induced climate change. Dr. Jain's has won numerous awards and honors, including the National Science Foundation's Faculty Early Career Development Award. He has served as a lead and contributing author for major assessments of the Intergovernmental Panel on Climate Change (IPCC). He is the author of over 150 scientific articles, including highly cited articles in Nature and Science, most relating to global climate change as affected by both human activities and natural phenomena. He also directs a number of research projects primarily oriented towards improving our understanding of the impacts that man-made and natural trace gases may be having on the Earth's climate. Dr. Jain received a Ph.D. in atmospheric sciences from the Indian Institute of Technology.

内容摘要：The bioenergy crops, Corn, Miscanthus and switchgrass have a potential to meet future energy demands in the US and mitigate climate change by partially replacing fossil fuels. However, the large-scale cultivation of these bioenergy crops may also impact climate change through changes in albedo, evapotranspiration (ET), and greenhouse gas (GHG) emissions. Whether these climate effects will mitigate or exacerbate climate change in the short and long terms is still considerably uncertain. The uncertainties come from our incomplete understanding of the effects of expanded bioenergy crop production on terrestrial water and energy balance, carbon and nitrogen dynamics, and their interactions. This study aims to understand the implications of growing large scale bioenergy crops on water resources, carbon and nitrogen dynamics in the United States using a data- modeling framework (ISAM) that we developed. Our study indicates that both Miscanthus and Cave-in-Rock switchgrass can attain high and stable yield in most part of Midwest, however, this high production is attained at the cost of increased soil water loss as compared to current natural vegetation. Alamo switchgrass can attain high and stable yield in the southern US without significant influence on soil water quantity.  However, growing Miscanthus and Cave-in-Rock can mitigate CO2 and N2O emissions to the atmosphere, whereas Alamo may increases emissions for these two GHGs to the atmosphere.