Temporal change in N2O production process after crop-residue input by continuous measurements of N2O isotopomer ratios using quantum cascade laser spectrometry

2015 Fiscal Year Final Research Report

• Project/Area Number: 26892010
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Single-year Grants
• Research Field: Environmental agriculture(including landscape science)
• Research Institution: Tokyo Gakugei University
• Principal Investigator: YAMAMOTO AKINORI 東京学芸大学, 教育学部, 講師 (20733083)
• Project Period (FY): 2014-08-29 – 2016-03-31
• Keywords: 亜酸化窒素 / 作物残渣 / N2O同位体レーザー分光計

Outline of Final Research Achievements

Nitrous oxide (N2O) has 298 times of the global warming potential than carbon dioxide. Crop-residue is an important N2O source in agricultural ecosystems. We measured N2O isotopomer ratios (bulk N isotope ratios, and intramolecular 15N site preference) using a quantum cascade laser spectrometry system to estimate microbial N2O production process after crop-residue input. The N2O isotopomer ratios showed large fluctuation throughout the experiment. We found that predominant microbial process of N2O production changed after crop-residue input.

Free Research Field

環境農学