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

本研究旨在探讨利用可调半导体激光分光光度计（TDLS）了解森林生态系统中微量气体动态的策略。CH_4等微量气体是重要的温室气体，尽管森林生态系统中有关源/汇及其动态的信息非常有限，但仍应了解其动态。建立了一个室内CH_4排放或吸收速率的测定系统，并进行了一年多的连续监测。

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.