报告题目：定量分析气候变化对澳大利亚、中国、欧洲、美国地区不同森林生态系统的长期植被生长和碳储量的复合及动态效应

Quantifying the complex and dynamic impacts of climate change on long-term tree growth and carbon stocks in different forest ecosystems of Australia, China, Europe and USA

报告人：徐志红先生（澳大利亚Griffith大学教授）

时间：2015-5-27 13:00-16:00

地点：校本部东区环化楼401会议室

报告摘要：Tree water-use efficiency (WUE) has increased in the past century, but this has not translated into globally enhanced tree growth. The impact of climate change, particularly atmospheric carbon dioxide concentration ([CO2]), temperature and water, on plant photosynthesis, WUE and tree growth remains elusive. We advance an atmospheric CO2-water limitation mechanism, which predicts enhanced tree WUE with rising [CO2] and increasing water limitation, and show that the growth of beech and oak in temperate forest ecosystems of Belgium responded non-linearly to rising [CO2] and water limitation induced by increasing mean annual temperature and decreasing summer rainfall during 1840s–1990s. This mechanism has been tested elsewhere, highlighting the subtropical to boreal convergence of non-linear responses of tree growth to rising [CO2], and the sensitivity and magnitude of tree growth responses to be influenced by biotic and abiotic factors. The tipping points of [CO2] (range: 324–378 ppm) for these forest ecosystems have been reached in the past 10–50 years, and thereafter tree growth has decreased with rising [CO2]. This results in a positive feedback to atmospheric [CO2], leading to accelerated global warming and increasing water limitation in central Europe and elsewhere.

报告人简介：Zhihong Xu has been appointed as Professor of Plant and Soil Systems at Griffith University since January 2004, and Director of Environmental Futures Research Institute (/Environmental Futures Centre) since July 2009. He has been Editor-in-Chief of Journal of Soils and Sediments since 2005, Editor of Environmental Science and Pollution Research and Chairperson of Forest Soils Working Group of International Union of Soil Science since 2006, and served as a member of College of Experts of Australian Research Council (ARC) (2008-2010) and a member of ARC ERA 2012 Research Evaluation Committee. He received his M.Sc. degree in 1984 from Institute of Soil Science, Chinese Academy of Sciences (CAS), Nanjing, China, and PhD in Environmental Science in 1991 from Griffith University, Nathan, Queensland, Australia.