Carbon Dioxide Evasion from Fluvial Environments of Amazonia: A Major Sink for Terrestrially Fixed Carbon and Tracer of Ecosystem Processes

确定二氧化碳的命运对环境有着重要的影响。森林，特别是在潮湿的热带地区，可能是非常大的碳汇。最近的证据表明，亚马逊河可能是大气二氧化碳的净汇，储存1-9毫克碳/公顷/年。该项目旨在了解亚马逊河系统在这个重要的热带森林生态系统的碳循环中二氧化碳排放或逃避的作用。这项研究的工作假设是，在年际基础上，二氧化碳逃避向大气中返回的碳与高地森林中隔离的碳一样多。从高地森林向河流环境输出的有机物质是碳的主要来源，最终在河流中被呼吸并以二氧化碳的形式被逃避。与此项目相关的实地工作将对亚马逊河流域的特征子盆地进行采样，以确定CO排放的时空变化。这个为期三年的项目将由华盛顿大学和核能农业中心的研究人员共同努力，并将模拟亚马逊河系统的整个生态系统碳通量。

Determining the fate of CO2 has important consequences to the environment. Forests, particularly in the wet tropics may be very large carbon sinks. Recent evidence suggests that the Amazon may be a net sink of atmospheric CO2, storing 1-9 Mg C / ha/ yr. This project seeks to understand the role of CO2 outgassing, or evasion, from the Amazon River system in the carbon cycle of this important mosit tropical forest ecosystem. The working hypothesis of this research is that CO2 evasion returns as much carbon to the atmosphere as is sequestered in upland forests on an interannual basis. Export of organic material from upland forests to fluvial environments is the primary source of carbon that is eventually respired in rivers and evaded as CO2. The field work associated with this project will samplecharacteristic sub-basins of the Amazon to determine the spatial and temporal variation in CO emission. The 3-year project will be a joint effort between researchers at the University of Washington and the Centro de Energia Nuclear na Agricultura and will model whole ecosystem carbon flux of the Amazon River system.