Isotope discrimination and Lagrangian analysis for process-based ecosystem modelling

通过光合作用和呼吸作用消耗和释放碳是生态系统的主要功能。这些过程统称为碳循环。陆地碳循环是大气中二氧化碳含量的重要决定因素。对碳循环的定量分析也是澄清生态系统如何运行和如何变化的重要手段。光合作用区别于碳的稳定同位素C13。此外，大气中C13的数量由于足底燃料消耗而发生变化。由于这两个事实，生态系统中碳循环的测量与其组成部分的同位素比率的测量相结合，能够提供关于生态系统功能的许多信息，并将使我们能够开发改进的生态系统过程模型，以便预测自然和农业系统未来的健康状况。该项目将根据微气象测量技术的最新进展，提供有关森林和农业系统中碳循环的详细信息。

The consumption and release of carbon through photosynthesis and respiration are major ecosystem functions. Together, these processes are called the carbon cycle. The terrestrial carbon cycle is a significant determinant of the amount of CO2 in the atmosphere. A quantitative analysis of the carbon cycle is also an important means of clarifying how an ecosystem is functioning and how it is changing. Photosynthesis discriminates against the stable isotope of carbon, C13. In addition, the amount of C13 in the atmosphere is changing due to foosil fuel consumption. Because of these two facts, measurements of the carbon cycle in ecosystems combined with measurements of the isotope ratio of its components is capable of providing much information about ecosystem function, and will allow us to develop improved models of ecosystem processes in order to predict the future health of both natural and agricultural systems. This project will provide detailed information about carbon cycles in a forest and in an agricultural system based on recent advances in micrometeorological measurement techniques.