... wastested at Vielsalm forest campaign for all systems except for the “PP-Or” system. For this purpose, measurements performed with the dif-ferent particular protocols were compared to measurements obtainedwith ... The forth campaignwas performed in the Chaux forest (June 2004) with “Li-62”, “Li-He”, “PP-Ch” and “PP-Or” on 29 PVC collars. The collars were in-serted in the forest soil 2 weeks before measurements. ... P.M., Below-canopy and soil CO2 efflux in ponderosa pine forest, Agric. For. Meteorol. 94(1999), 171–188.[13] Le Dantec V., Epron D., Dufrene E., Soil CO2 efflux in a beechforest: comparison of...