Doctoral Dissertation Research: Multi-Proxy Paleoecological Records from the Shark River Estuary: Wetland Evolution in the Light of Paleohurricane Activity and Sea-Level Changes

博士论文研究：鲨鱼河口的多代理古生态记录：古飓风活动和海平面变化下的湿地演化

• 批准号: 1303114
• 负责人: Kam-biu Liu
• 金额: $ 1.57万
• 依托单位: Louisiana State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-04-01 至 2015-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1303114&HistoricalAwards=false
• 关键词: Doctoral; Dissertation; Research; Multi; Proxy

This doctoral dissertation research project will examine the long-term response of coastal wetland communities to past sea-level fluctuations and recurrent hurricane strikes to reveal the Holocene history of mangrove forests in the Everglades of southwestern Florida. No palynological record older than 5,000 years before the present currently exists for this region. The doctoral student will help fill this gap by integrating various paleoecological methods including palynological, x-ray fluorescence, and loss-on-ignition analyses to produce the first pollen record and paleo-hurricane proxy record over the past 7,500 years and reveal the oldest depositional history of the coastal Everglades. Radioactive isotope analyses of 14-carbon, 137-cesium, and 210-lead will be used to date sediment samples collected from locations along and near the Shark River Slough. Analyses of a sediment core previously collected at the mouth of the Shark River Slough had identified a distinctive stratigraphic signature for Hurricane Wilma, an intense hurricane that directly struck the study area in 2005. This storm deposit will be used as a modern analog for identifying other hurricane events in other cores. Analyses of these cores and the resulting vegetation chronologies that will be produced should help reveal the response of mangrove forests to past sea-level rise and hurricane disturbance.Coastal mangrove forests in the Everglades are an important natural resource. By coupling palynology with paleotempestology, the results of this study will shed light on the response of the mangrove ecosystem to multiple extreme events over timescales of centuries to millennia. Such a database addresses two key issues in the management and restoration of the Everglades coastal ecosystems: rapid sea-level rise and extreme hurricane disturbances. The palynological results will provide guidelines and background knowledge for management planning for coastal protection and restoration. This project also should help identify the frequency of catastrophic hurricanes in South Florida, which is information vital for risk assessment and disaster management in the region. As a Doctoral Dissertation Research Improvement award, this project will provide support to enable a promising student to establish an independent research career.

该博士论文研究项目将研究沿海湿地群落对过去海平面波动和反复飓风袭击的长期反应，以揭示佛罗里达州西南部大沼泽地红树林的全新世历史。 该地区目前不存在距今 5000 年前的孢粉学记录。 这位博士生将通过整合各种古生态学方法（包括孢粉学、X射线荧光和烧失量分析）来帮助填补这一空白，以产生过去 7,500 年来的第一个花粉记录和古飓风代理记录，并揭示最古老的沉积物沿海大沼泽地的历史。 对 14 碳、137 铯和 210 铅的放射性同位素分析将用于确定从鲨鱼河沼泽沿线和附近地点收集的沉积物样本的年代。 对先前在鲨鱼河斯劳口收集的沉积物岩心进行分析，确定了飓风威尔玛的独特地层特征，这是一场于 2005 年直接袭击研究区域的强烈飓风。该风暴沉积物将用作现代模拟，用于识别其他风暴沉积物。其他核心的飓风事件。 对这些核心的分析以及由此产生的植被年表应有助于揭示红树林对过去海平面上升和飓风干扰的反应。大沼泽地的沿海红树林是一种重要的自然资源。 通过将孢粉学与古风暴学相结合，这项研究的结果将揭示红树林生态系统对数百年至数千年时间尺度内多种极端事件的反应。这样的数据库解决了大沼泽地沿海生态系统管理和恢复的两个关键问题：海平面快速上升和极端飓风干扰。 孢粉学结果将为沿海保护和恢复的管理规划提供指导和背景知识。 该项目还应有助于确定南佛罗里达州灾难性飓风的频率，这对于该地区的风险评估和灾害管理至关重要。作为博士论文研究改进奖，该项目将为有前途的学生建立独立的研究生涯提供支持。

项目成果

A Geochemical Record of Late‐Holocene Hurricane Events From the Florida Everglades

佛罗里达大沼泽地全新世晚期飓风事件的地球化学记录

• DOI: 10.1029/2019wr026857
• 发表时间: 2020-08
• 期刊: Water Resources Research
• 影响因子: 5.4
• 作者: Yao, Qiang;Liu, Kam‐biu;Rodrigues, Erika;Bianchette, Thomas;Aragón‐Moreno, Alejandro Antonio;Zhang, Zhenqing
• 通讯作者: Zhang, Zhenqing