Linking Ecosystem Processes and Community Structure Along Salinity and Nutrient Gradients In Tropical Marshes

将热带沼泽中盐度和营养梯度的生态系统过程和群落结构联系起来

• 批准号: 0089211
• 负责人: Eliska Rejmankova
• 金额: $ 29.97万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-06-01 至 2006-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0089211&HistoricalAwards=false
• 关键词: Linking; Ecosystem; Processes; Community; Structure

Abstract00-889211RejmankovaLinking ecosystem processes and community structure along salinity and nutrient gradients in tropical marshesAccelerated land use change in the tropics is increasing nutrient loading to aquatic ecosystems. This is resulting in changes in species composition and ecosystem functions such as primary production and nutrient cycling. The aim of this research is to obtain a mechanistic explanation for an ecosystem level response to increased nutrient input along a salinity gradient. Dr. Rejmankova and colleagues propose that there is a context (salinity) dependent switch between phosphorus (P) and nitrogen (N) limitation in tropical marshlands. This project will use P-limited wetland ecosystems in Belize as a model system on which to document how nutrient limitation can be shifted along a salinity gradient through different constraints on individual components of plant communities. A short-term mesocosm experiment will evaluate response of individual marsh components to different levels of salinity, P and N. A long-term experiment involving additions of nutrients to a replicated set of marshes of different salinity will verify the predictions of the ecosystem-level response. In addition to the intellectual merit of a better understanding of these ecosystems, the project has immediate relevance to conservation of wetlands, and may provide data that will be relevant to malaria control in Belize.

Rejmankova热带沼泽中沿着盐度和养分梯度的生态系统过程和群落结构的联系热带土地利用的加速变化正在增加水生生态系统的养分负荷。这导致物种组成和生态系统功能的变化，如初级生产和养分循环。本研究的目的是获得一个机制的解释生态系统水平的响应增加养分输入沿着盐度梯度。 Rejmankova博士及其同事提出，在热带沼泽地中，磷（P）和氮（N）限制之间存在一种依赖于环境（盐度）的转换。该项目将利用伯利兹的磷限制湿地生态系统作为一个模式系统，记录如何通过对植物群落各个组成部分的不同限制，使养分限制沿着盐度梯度转移。一个短期的围隔生态系统实验将评估个别沼泽组成部分对不同水平的盐度、磷和氮的反应。 一个长期的实验，涉及添加营养素的一组不同盐度的沼泽复制将验证预测的生态系统一级的反应。除了更好地了解这些生态系统的知识价值外，该项目还与湿地保护直接相关，并可能提供与伯利兹疟疾控制有关的数据。