純生態系炭素収支調査のための閉鎖系陸圏実験施設からの空気漏洩量ミニタリング方法

概要

論文の詳細を見る
To choose an appropriate method for the long-term measurement of air leakage from the Closed Geosphere Experiment Facility (CGEF), a simpler facility-specific method was examined and compared with a conventional method. The CGEF, which is highly airtight, was designed to investigate carbon cycles of terrestrial ecosystems. In addition, a wetland ecosystem is scheduled to be installed in the facility. The facility comprises a Geosphere Module (GM) and a Geosphere Material Circulation (GMC) System. The size of the GM is a 5.8 m × 8.7 m ground area and 11.9 m average height including 3.1 m soil depth. In this study, air leakage from the CGEF was measured with two different methods. One was the facility-specific method that measures air supply to the GM by a mechanical pressure controller (PC) system. If losses are recorded, air leakages are indicated. The other was the conventional method, which estimates air leakage by measuring tracer gas concentrations. A good agreement was found between the two methods with relative errors of 14%, 4%, and 3% in the three replications of experiments. Although the air leakage relative to the GMs volume (air exchange rate) is very small (4.6 × 10-3 h-1), the long-term monitoring of the air leakage is essential to estimate the influence of air leakage on the carbon balance in the wetland ecosystem during the several-year investigation. This study suggests that the facility-specific method (air supply to the GM by the mechanical PC system) is simple and accurate to monitor air leakage from the CGEF over long periods.
生態工学会の論文
2010-10-31

純生態系炭素収支調査のための閉鎖系陸圏実験施設からの空気漏洩量ミニタリング方法

スポンサーリンク

概要

著者

関連論文

スポンサーリンク