Use of Tunable Diode Laser Spectrophotometer (TDLS) for the understanding of trace gas dynamics in ecosystems

本研究项目旨在探讨利用可调谐二极管激光分光光度计（TDLS）了解森林生态系统中微量气体动力学的策略。森林生态系统中CH_4等微量气体是重要的温室气体，其源/汇及其动态信息非常有限，但仍需进一步了解其动态。建立了1)室内尺度的非饱和土壤、叶片、茎等森林生态系统各隔室CH_4排放或吸收率测量系统，2)用REA法测量冠层CH_4通量，3)测量CH4浓度垂直剖面，并持续监测1年以上。

This research project aims to investigate the strategies of the use of tunable diode laser spectrophotometer (TDLS) for the understanding of trace gas dynamics in the forest ecosystem. Trace gases such as CH_4 are important greenhouse gases and their dynamics should be understood, although the information about source/sink and their dynamics is very limited in the forest ecosystems. We established the systems for measuring 1) chamber scale CH_4 emission or absorption rate from each compartment of the forest ecosystem such as unsaturated soil, foliage, stem, 2) canopy CH_4 flux with REA method, and 3) vertical profile of CH4 concentration, and continued the monitoring for more than one year.