Global Research Alliance N₂O chamber methodology guidelines: Design considerations

TLDR

Terrestrial ecosystems produce greenhouse gases, and the chamber method is the primary tool for measuring soil‑plant GHG fluxes and studying influencing factors. This study reviews and synthesizes literature on non‑flow‑through, non‑steady‑state chamber designs and the factors that influence nitrous oxide flux measurements. Chamber design must consider materials, insulation, sealing, venting, depth, and plant activity, with bench testing to minimize artifacts, and further research is needed to evaluate fan effects on soil gas flux.

Abstract

Terrestrial ecosystems, both natural ecosystems and agroecosystems, generate greenhouse gases (GHGs). The chamber method is the most common method to quantify GHG fluxes from soil-plant systems and to better understand factors affecting their generation and mitigation. The objective of this study was to review and synthesize literature on chamber designs (non-flow-through, non-steady-state chamber) and associated factors that affect GHG nitrous oxide (N2 O) flux measurement when using chamber methods. Chamber design requires consideration of many facets that include materials, insulation, sealing, venting, depth of placement, and the need to maintain plant growth and activity. Final designs should be tailored, and bench tested, in order to meet the nuances of the experimental objectives and the ecosystem under study while reducing potential artifacts. Good insulation, to prevent temperature fluctuations and pressure changes, and a high-quality seal between base and chamber are essential. Elimination of pressure differentials between headspace and atmosphere through venting should be performed, and designs now exist to eliminate Venturi effects of earlier tube-type vent designs. The use of fans within the chamber headspace increases measurement precision but may alter the flux. To establish best practice recommendations when using fans, further data are required, particularly in systems containing tall plants, to systematically evaluate the effects that fan speed, position, and mixing rate have on soil gas flux.