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Methane Oxidation in Two Swedish Landfill Covers Measured with Carbon-13 to Carbon-12 Isotope Ratios

^a Dep. of Water and Environmental Studies, Linköping Univ., SE-581 83 Linköping, Sweden
^b Dep. of Oceanography, Florida State Univ., Tallahassee, FL 32306-4320

View larger version (25K): [in a new window]   Fig. 1. One example each of incubations from 25°C (A and B) and 4°C (C and D). Monitored over time were CH4 uptake, CO2 production (A and C), and the 13C of each of these gases (B and D). Solid symbols represent CH4 while open symbols represent CO2. In every incubation (n = 7 at 4°C and n = 10 at 25°C), the CH4 uptake rate was greater than the CO2 production rate. From the isotopic composition of methane oxidized (calculated with Eq. [5]) and the measured 13C of soil organic matter, we were able to partition the CO2 produced from these two sources (Eq. [6]) to determine the apportionment of CH4 to methanotrophic biomass and respiration, respectively ("carbon utilization", Table 6). Note the different times scales on the x axes

View larger version (19K): [in a new window]   Fig. 2. The isotopic composition of methane plotted versus the ln of the fraction of methane remaining at a number of time points in closed-system incubations of methane in air over landfill soil. M represents the concentration of methane at time t and Mo represents the concentration at the initial time. Using the slopes of the lines fit to the data from different incubations (represented by the different symbols), the fractionation factor () was calculated using Eq. [3], where 1000(1/ - 1) is the slope of the line fit to the data. Solid symbols represent incubations of soil from the Hökhuvud landfill while open symbols represent soil from the Falköping landfill