低温科学 = Low Temperature Science;第77巻

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安定同位体を用いた森林生態系における 炭素循環の解明

村山, 昌平

Permalink : http://hdl.handle.net/2115/73990
JaLCDOI : 10.14943/lowtemsci.77.27
KEYWORDS : 安定同位体比;森林生態系;炭素循環;Stable isotope;Forest ecosystem;Carbon cycle

Abstract

安定同位体比の測定は,森林生態系の炭素循環の解明,特に各炭素フローの分離評価に有効である. 本稿では,質量分析計を用いた安定同位体比測定と森林生態系における二酸化炭素(CO2)の安定同位 体比の変動プロセスの概要を述べる.酸素同位体比を利用した夜間の生態系呼吸を土壌呼吸と葉呼吸 に分離する研究例を紹介し,さらに最新のレーザー分光法によるCO2の炭素同位体比の連続観測に基 づく炭素フロー分離評価の例を示す.
Stable isotope measurements are very useful in obtaining a greater insight into the cycling of carbon in forest ecosystems, especially in the attribution of the net carbon flux into various gross fluxes. In this article, a brief description of stable isotope measurements using a mass spectrometer is given, along with processes that give rise to variations in the stable isotopic ratios of carbon dioxide (CO2) in a forest ecosystem. Also included in the discussion are various studies highlighting the separation of nocturnal ecosystem respiration into soil and leaf respirations using oxygen isotopes, as well as separating out various gross carbon fluxes based on continuous stable isotope measurements of CO2 using a recent laser spectroscopy.

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