Using Natural Variation in Isotopic Composition of Forest C02 to Study Ecosystem-Atmosphere Carbon Exchange

利用森林CO2同位素组成的自然变化来研究生态系统-大气碳交换

• 批准号: 9905717
• 负责人: James Ehleringer
• 金额: $ 17.5万
• 依托单位: University of Utah
• 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: 1999-10-01 至 2002-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9905717&HistoricalAwards=false
• 关键词: Using; Natural; Variation; Isotopic; Composition

The objective of this project is to develop the hyperbolic relaxed eddy accumulation technique for measurements of biosphere-atmosphere exchange of isotopomers of carbon dioxide (CO2), such as 13CO2 and C18OO. If these measurements can be carried out successfully, they can be used to partition net ecosystem CO2 exchange (NEE) into the photosynthetic and respiratory components and an independent examination of the response of these opposing processes to environmental forcings. The project will focus on an initial field feasibility analysis. Measurements will be made at a coniferous forest at Niwot Ridge, Colorado, and a grassland site in Lethbridge, Alberta.This project is supported jointly by the Divisions of Earth and Atmospheric Sciences and the Division of Molecular and Cellular Biology through the Environmental Geochemistry and Biogeochemistry Program (EGB).

本项目的目标是发展双曲线松弛涡动积累技术，用于测量二氧化碳（CO2）同位素（如13 CO2和C18 OO）的生物圈-大气交换。如果这些测量可以成功地进行，他们可以用来分区净生态系统CO2交换（NEE）到光合和呼吸组件和这些相反的过程对环境强迫的响应的独立检查。该项目将侧重于初步的实地可行性分析。测量将在科罗拉多尼沃特岭的针叶林和阿尔伯塔莱斯布里奇的一个草地进行，该项目由地球和大气科学部以及分子和细胞生物学部通过环境地球化学和生物地球化学计划（EGB）联合支持。