分光便利帳

オープンパス分光法とクローズドチェンバー法の組み合わせによる
水田から発生するガスの観測

Observation of Gases from Paddy Fields by the Open-path Spectroscopy
Combined with the Closed-chamber Method

榎本隆典・小林大起・吉村季織・武藤由子・侯　　紅・
本林　隆・渡辺裕純・豊田剛己・西村　拓・細見正明・高柳正夫

Takanori ENOMOTO, Daiki KOBAYASHI, Norio YOSHIMURA, Yoshiko MUTO, Hou Hong, Takashi MOTOBAYASHI, Hirozumi WATANABE, Koki TOYODA, Taku NISHIMURA, Masaaki HOSOMI, and Masao TAKAYANGI

　　表題の手法（光路長180 cm）で，水田から発生するメタンの観測に成功した．亜酸化窒素とアンモニアは感度不足のため観測できなかった．この手法で，イネによる二酸化炭素の消費を追跡できることがわかった．

　　Open-path FT-IR spectroscopy combined with the closed-chamber method was used to measure quantitative fluxes of gases from paddy fields. Methane has been successfully observed with the optical path-length of 180 cm. Variation of the concentration of carbon dioxide has also been measured. The technique is expected to be an effective tool for monitoring gas balances at farmlands.

Keywords: Open-path FT-IR spectroscopy, closed-chamber method, gases from paddy field, quantitative analysis, methane