Permanent plots for gas flux measurement were established by driving 20.3 cm inside diameter PVC pipe, 8-cm into the soil. We measured CH4, N2O and CO2 flux by placing closed, vented chambers over the established anchors and taking gas samples from inside the chambers at prescribed intervals, totaling one hour or less, with polypropylene syringes fitted with nylon stopcocks. The 7.5 cm high chambers were constructed from PVC pipe and sheeting and the tops were covered with reflective tape. The vented chambers were preparred according to Hutchinson and Mosier (1981, Soil Sci. Soc. Am. J. 45:311-316). Gas samples were analyzed for CH4, N2O and CO2 by gas chromatography. Refer methodology questions to A.R. Mosier (firstname.lastname@example.org). Photo of instrument at http://nrel.colostate.edu/projects/tragnet/instruments.html.