Microbial mechanism of soil nitrification and the potential manipulation on soil nitrifier
报 告 人：Prof. Limei Zhang 张丽梅 教授 中国科学院生态环境研究中心(Research Centre for Eco-environmental Sciences, CAS)
联 系 人：张晓君 email@example.com
Microorganisms are the engines driving the biogeochemical cycles of soil nitrogen element. Nitrification is the centre of the nitrogen cycle, as it not only determines the bioavailability of N to plant, but also associates with a series of negative effects including soil acidification, nitrate losses and pollution of groundwater, and N2O emissions which caused by excessive input of chemical N fertilizer in agriculture. Dr. Zhang’s research interests focus on microbial diversity and biogeochemical cycling of N in soil ecosystems. Her research employs DNA- and RNA-based molecular ecology, high throughput sequencing, Geochip, stable isotope probing (SIP) techniques to understand the diversity, functional activity of microbes and functional genes involving in the N transform and their links to N process. Her work initiavtively conducted investigation on the distribution of ammonia-oxidizing bacteria (AOB) and archaea (AOA) across a wide range of Chinese soils, including acidic, alkaline upland, alpine and paddy soils, and further demonstrated that AOA take more important role than AOB in a low - N agriculture soil and a highly acidic soil. These studies provided direct evidence for AOA’s contribution to soil nitrification for the first time and directly
linked the ammonia oxidation activity in acidic soil ecosystems to AOA. Further finding on the community and activity shifts of ammonia oxidizers in different habitats suggested the niche separation of AOA and AOB in different environmental conditions. This lecture will give a brief summary on the advance on the diversity, ecophysiology, activity of AOA and AOB in different soils and the potential manipulation practice on nitrifiers in agricultural ecosystem.
Limei Zhang, Dr. Limei Zhang earned bachelor degree (Microbiology) from Yunan University in 1999, and master degree (Plant Nutrition) from Zhejiang University in 2002, and PhD (Microbiology) from Institute of Microbiology, Chinese Academy of Sciences (CAS) in 2005. Since 2005, she joined Research Center for EcoEnvironmental Sciences, CAS, as an assistant professor and was promoted to associate professor in Dec. 2010 and professor in Dec. 2015. She carried international collaboration with University of Aberdeen, University of Warwick (UK) and National University of Ireland, Galway, during the past 10 years. She was awarded National Science Fund for Excellent Young Scholars in 2013 and Newton Advanced Fellowship in 2018. Dr. Zhang’s research interests focus on microbial diversity and biogeochemical cycling of N in soil ecosystems. Her research employs DNA- and RNA-based molecular ecology, high throughput sequencing, Geochip, stable isotope probing (SIP) techniques to understand the diversity, functional activity of microbes and functional genes involving in the N transform and their links to N process. More recently, Dr. Zhang’s research interest move forward to the microbial mechanisms of coupling or alternation between aerobic and anaerobic N processes and their contribution to N loss and N2O emission in soils, and the rationale of soil management practices regulating soil microbiome to improve N use efficiency.