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

该项目的目标是开发双曲线松弛涡流积累技术，用于测量13CO2和C1800等二氧化碳(CO2)的生物圈-大气交换。如果这些测量能够成功进行，它们可以用来将净生态系统二氧化碳交换(NEE)划分为光合作用和呼吸成分，并独立检查这些相反过程对环境压力的反应。该项目将侧重于初步的现场可行性分析。测量将在科罗拉多州尼沃特岭的针叶林和艾伯塔省莱斯布里奇的草原站点进行。该项目由地球和大气科学系以及分子和细胞生物学系通过环境地球化学和生物地球化学计划(EGB)联合支持。

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).