讲座题目：Carbon Flows in Temperate Tidal Marsh Ecosystems: Insights from Individual Studies to Global Synthesis
主讲人：Ariane Arias-Ortiz 教授
主持人：李秀珍 研究员
开始时间：2024-06-03 10:00
讲座地址：闵行校区河口海岸大楼A204
主办单位：河口海岸科学研究院
报告人简介：
Dr. Ariane Arias-Ortiz is a tenure-track professor in the Physics Department at Universitat Autònoma de Barcelona (UAB). She holds an MSc in Oceanography and Marine Environmental Management from the University of Barcelona and a PhD in Environmental Science and Technology from UAB. She completed her postdoctoral research at the University of California, Berkeley, as a NOAA Climate and Global Change Postdoctoral Fellow. Ariane is interested in carbon biogeochemical cycling, ecosystem-atmosphere interactions, and the use of radionuclides in environmental materials to study present, past, and future processes. Her work focuses on understanding the capacity of coastal ecosystems to store carbon and the carbon losses associated with the degradation of these habitats. Ariane and her team combine micrometeorological measurements with the analysis of stable and radioactive isotopes in soils and water to study carbon and energy flows between coastal ecosystems, the atmosphere, and adjacent water bodies, providing insights into how these fluxes respond to disturbance, land management, and a changing climate.
报告内容：
Coastal wetlands are among the most productive habitats on Earth, playing a crucial role in sequestering atmospheric carbon (C). While high soil C accumulation rates suggest efficient C storage, the true net atmospheric C sequestration by wetlands depends on how well organic C is incorporated into the soil versus its export to coastal waters and offset by methane (CH4) emissions. The net rate of C accumulation or loss from an ecosystem conforms the net ecosystem carbon balance (NECB), which varies widely and is influenced by numerous factors such as elevation, vegetation, inundation, salinity, soil type, tidal influence, and/or wetland age. In this talk, soil C accumulation rates and both chamber and eddy covariance (EC) methods are leveraged to provide a comprehensive analysis of C burial, emissions, and export in temperate tidal marshes. The combination of EC and chamber flux datasets offers insights into the roles of salinity, sulfate concentrations, and temporal variability in predicting and upscaling CH4 fluxes across time and space scales. Additionally, high-resolution monitoring of gas exchange and lateral C transport enhances our understanding of the contribution of hydrologic carbon export to the net Cbudget of tidal wetlands and their role as both a landscape source and sink of carbon. Using individual case studies and results from global synthesis, this talk explores the interplay between carbon burial, emissions, and hydrologic export, offering valuable insights into the benefits of tidal wetland restoration for climate change mitigation.
