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主要的生态系统功能。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阐明生态系统如何运作以及如何变化的重要手段。光合作用与碳的稳定同位素C13相反。此外，由于燃料消耗，大气中C13的含量正在发生变化。由于这两个事实，在生态系统中的碳循环的测量结合其组成部分的同位素比的测量能够提供有关生态系统功能的信息，并将使我们能够开发改进的生态系统过程模型，以预测未来的健康自然和农业系统。该项目将根据微气象测量技术的最新进展，提供关于森林和农业系统碳循环的详细信息。

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.