讲座题目：Sudden Salt Marsh Dieback: Causes and Implications for the Control of Spartina alterniflora 主讲人⛹🏻♂️：Irving Mendelssohn 教授 主持人：李秀珍 教授 开始时间🎼：2019-10-30 15:10:00 讲座地址：闵行校区河口海岸大楼B101报告厅 主办单位：河口海岸科学研究院
报告人简介🧎♀️： Dr. Irving A. Mendelssohn currently holds the position of Professor Emeritus in the Department of Oceanography & Coastal Sciences, Louisiana State University. He is a Fellow of the Society of Wetland Scientists and Merit Awardee, and holds an Honorary Doctorate from the University of Aarhus, Denmark, where he conducted research as a visiting scientist. Dr. Mendelssohn’s recent research emphasizes the restoration and sustainability of coastal wetlands, the analysis of the causes of vegetation dieback in coastal marshes, and the effects of multiple stressors, including sea-level rise, eutrophication, oil pollution and salt water intrusion, on the ecology and restoration of coastal wetlands. 报告内容： A large-scale, drought induced disturbance occurred in the Mississippi River Delta Ecosystem of Louisiana during the year 2000 and repeatedly throughout the decade. Approximately 200,000 ha of Spartina-dominated marshes died or were stressed. Although drought was likely the ultimate cause for the extensive dieback, the proximate cause for plant impact was not apparent. An interdisciplinary, multi-investigator research program was designed to evaluate the cause(s) of this unique event. Field, laboratory and greenhouse investigations assessed the influence of abiotic factors (hydrology, soil drainage, precipitation, acidity, salinity, moisture, and metals) and biotic controls (fungal pathogens and snails) on plant and soil chemical responses that could provide insight into causation. Although the dieback was certainly the result of multiple, interacting factors, insufficient soil moisture, in conjunction with specific soil physico-chemical conditions, resulted in soil oxidation, acidification, and increased metal availability, which likely interacted synergistically to cause plant mortality and sudden salt marsh dieback. Somewhat elevated salinities and fungal pathogens may have played a secondary role. This research elucidates mechanisms of drought-induced dieback in salt marshes and, along with providing empirical data from which to populate predictive models of future drought-induced extreme weather events, may also suggest possible management approaches to implement or avoid in the attempt to control the invasion of non-native Spartina alterniflora. |
