Doctoral Dissertation Research: Climate and Sea Level Control of Holocene Environments in South Florida

博士论文研究：南佛罗里达全新世环境的气候和海平面控制

• 批准号: 9900840
• 负责人: Vance Holliday
• 金额: $ 1万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-06-01 至 2002-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9900840&HistoricalAwards=false
• 关键词: Doctoral; Dissertation; Research; Climate; Sea

The Everglades of southern Florida is home to one of the worlds largest freshwater marshes. Low topographic relief and abundant precipitation support diverse wetland communities, including sawgrass prairie, hardwood hammocks, water lily marshes, and brackish mangrove swamp. Considerable ecological research has focused on the modern biotic communities of this region and the detrimental effects human-related influences are having on the Everglades. Important to this discussion but less well-represented in the literature is the evolution of the Everglades over time. Variations in climate and sea level throughout the Holocene have played a crucial role in the evolution of this unique environment. An understanding of the response of Everglades hydrology and biota to past changes in climate and sea level is critical for predicting how this ecosystem will respond to both human and natural environmental changes in the future. This project will explore the Holocene paleoecology of the Everglades region of southern Florida and the relationship between terrestrial ecosystems, climate, and sea level. The project aims at understanding the cause and effect nature of climate and sea-level change on regional hydrology and the distribution of vegetative communities. Proxy records of climatic and environmental change, including sediment composition, pollen profiles, diatom spectra and other microfossils remains, will be employed to reconstruct the past climates and hydrological regimes of the region. Emphasis is also given to identifying the impact of Holocene eustatic fluctuations on the coastal and inland wetland assemblages. This project will provide valuable new insights into the natural historical evolution of the Everglades and other significant wetlands, particularly the relationships among climate, sea-level change, and biotic communities. Increased understandings of how the area's vegetation has been impacted in the past by changing climatic regimes and sea-level changes is critical for the development of effective strategies for preserving and restoring Everglades ecosystems in the face of intensified human population pressure and natural environmental changes. As a Doctoral Dissertation Research Improvement award, this award also will provide support to enable a promising student to establish a strong independent research career.

佛罗里达州南部的大沼泽地是世界上最大的淡水沼泽之一的所在地。 低地形浮雕和丰富的降水支持多样化的湿地社区，包括锯草大草原，硬木吊床，水百合沼泽和咸红树林沼泽。 大量的生态研究集中在该地区的现代生物群落上，与大沼泽地有关的与人类相关的影响有害。 对于讨论而言，重要的是文献中的众多，但随着时间的流逝，大沼泽地的演变是众所周知的。 整个全新世的气候和海平面的变化在这种独特的环境的发展中起着至关重要的作用。 对大沼泽水文学和生物群对过去气候变化的反应的理解对于预测该生态系统将如何对未来的人类和自然环境变化做出反应至关重要。 该项目将探讨佛罗里达州南部大沼泽地地区的全新世古生态学以及陆地生态系统，气候和海平面之间的关系。 该项目旨在了解气候和海平面变化对区域水文学以及植物社区分布的原因和影响的性质。 气候和环境变化的代理记录，包括沉积物成分，花粉概况，硅藻光谱和其他微化石，还将用于重建该地区过去的气候和水文制度。 还重点是确定全新世辉煌波动对沿海和内陆湿地组合的影响。 该项目将为大沼泽地和其他重要湿地的自然历史演变提供宝贵的新见解，尤其是气候，海平面变化和生物群落之间的关系。 面对人口增强和自然环境的变化，通过改变气候制度和海平面变化，人们对该地区植被如何通过改变气候制度和海平面变化的影响是如何对该地区的植被产生影响至关重要的。 作为博士学位论文研究改进奖，该奖项还将提供支持，使有前途的学生能够建立强大的独立研究职业。