Field Micrometeorological Measurements, Process-Level Studies and Modeling of Methane and Carbon Dioxide Fluxes in a Boreal Wetland Ecosystem

北方湿地生态系统中甲烷和二氧化碳通量的现场微气象测量、过程水平研究和建模

• 批准号: 9217843
• 负责人: Shashi Verma
• 金额: $ 70.5万
• 依托单位: University of Nebraska-Lincoln
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-05-01 至 1998-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9217843&HistoricalAwards=false
• 关键词: Field; Micrometeorological; Measurements; Process; Level

Scientists from the University of Nebraska and Colorado State University will carry out an integrated program of research on field micrometeorological measurements, process studies and modeling of methane and carbon dioxide fluxes in a boreal wetland ecosystem, as part of the BOREAS Project in Canada. The program has four components: 1. Quantification of surface exchange rates of methane and carbon dioxide at a boreal wetland site over the course of a growing season using the micrometeorological eddy correlation technique. 2. Evaluation of the variability of methane and carbon dioxide fluxes across the landscape using chambers. 3. Process studies (field experimental manipulations) to quantify the degree of substrate or nutrient limitations of methane production and oxidation. Responses of leaf photosynthesis, plant respiration and stomatal conductance of dominant vascular plant species to relevant controlling variables will be quantified experimentally. 4. Integration of the first three components to test and improve a model of decomposition and methane emission. The field measurements will allow temporal variation in fluxes of methane and carbon dioxide to be related to underlying biological and biophysical processes. These measurements are needed to support modeling of methane emission from northern wetland ecosystems.

作为加拿大 BOREAS 项目的一部分，内布拉斯加大学和科罗拉多州立大学的科学家将开展一项综合研究计划，涉及北方湿地生态系统中甲烷和二氧化碳通量的现场微气象测量、过程研究和建模。 该计划由四个部分组成： 1. 使用微气象涡流相关技术对北方湿地在生长季节期间甲烷和二氧化碳的表面交换率进行量化。 2. 使用室评估整个景观中甲烷和二氧化碳通量的变化性。 3. 过程研究（现场实验操作），以量化甲烷产生和氧化的底物或养分限制程度。 将通过实验量化优势维管植物物种的叶片光合作用、植物呼吸和气孔导度对相关控制变量的响应。 4. 整合前三个组成部分以测试和改进分解和甲烷排放模型。 现场测量将使甲烷和二氧化碳通量的时间变化与潜在的生物和生物物理过程相关联。 需要这些测量来支持北部湿地生态系统甲烷排放的建模。