In situ quantification of CH4 bubbling events from a peat soil using a new infrared laser spectrometer

摘要: CH4 emissions from peatlands are space and time dependent. The variety of efflux routes contributes to these variabilities. bubbling remains difficult investigate since it occurs on a timescale seconds. aims this study were use for the first recently built infrared high-resolution spectrometer, SPectrometre Infra-Rouge In situ Tropospherique (1) measure in fluxes natural artificial peatland plot (2) observe online events with quantification emission corresponding very sudden degassing event. closed dynamic chamber method was used gas concentration measured every 1.5 s. Emission calculated by accumulation rate against time. Measurements undertaken during daytime March 2009 day- nighttime May 2009, Sphagnum Betula plots wet artificially bared peat area Eriophorum vaginatum. results show that estimated (SPIRIT) consistent those already published. high emissions, both through diffusion plot, same order as shallow pools. During daytime, higher (54.7% total emission) than (40.7%) probably because increased production peat. May, at (65.5%) (54.7%). This has an important implication carbon budget assessment peatlands. SPIRIT, able reliably quantify flux bubbles. obtained agreement previously published data using other measurement techniques. preliminary work highlight importance pools sensitivity such atmospheric pressure, relation not been fully investigated or taken into account assessing balance.