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Continuous Measurements of Belowground Nitrous Oxide Concentrations

Department of Land Resource Science, Univ. of Guelph, Guelph, ON, Canada N1G 2W1

View larger version (16K): [in this window] [in a new window]   Fig. 1. Schematic of the buried sampling probe used to obtain measurements of belowground N2O concentration. Liquid level sensor, thermocouples, and gas sampling tubing extended to the base of the vertical access tube. TDLTGA = tunable diode laser trace gas analyzer.

View larger version (17K): [in this window] [in a new window]   Fig. 2. Time series of 0.2 Hz N2O concentrations measured by the tunable diode laser trace gas analyzer during soil gas sampling on 27 Mar. 2005.

View larger version (23K): [in this window] [in a new window]   Fig. 3. Time series of measurements during soil gas sampling in March and April 2005: (A) snow depth (thick line) and cumulative precipitation in units of millimeter liquid equivalent (thin line), (B) wind velocity measured at 10 m above the ground, (C) air temperature measured at 1.5 m above the ground, (D) soil temperature measured at 5- (thin line) and 25-cm (thick line) depths, (E) soil volumetric water content measured at 5- (thin line) and 25-cm (thick line) depths, and (F) N2O concentrations at the 25-cm depth.

View larger version (25K): [in this window] [in a new window]   Fig. 4. Time series of (A) wind velocity and (B) N2O measurements obtained at the 25-cm soil depth in a conventionally tilled agricultural field between 15 and 24 Mar. 2005.

View larger version (27K): [in this window] [in a new window]   Fig. 5. Time series of (A) wind velocity and (B) N2O measurements obtained at the 25-cm soil depth in a conventionally tilled agricultural field between 31 Mar. and 14 Apr. 2005.

View larger version (17K): [in this window] [in a new window]   Fig. 6. Relationship of 25-cm-depth soil N2O concentration and wind speed measured at 10 m above the surface between (A) 15 and 24 Mar. 2005 and (B) 30 Mar. and 14 Apr. 2005.