Oxic soil

Bender M, Conrad R. Kinetics of CH4 oxidation in oxic soils exposed to ambient air or high CH4 mixing ratios. FEMS Microbiol. Ecol. 1992 101 261-270. 

GoBner A, Devereux R, Ohnemtiller N, et al. 1999. Thermicanus aegyptius gen. nov., sp. nov., isolated from oxic soil, a facultative microaerophile that grows com-mensally with the thermophilic acetogen Moorella thermoacetica. Appl Environ Microbiol 65 5124-33. 

Peters V, Conrad R. 1995. Methanogenic and other strictly anaerobic bacteria in desert soil and other oxic soils. Appl Environ Microbiol 61 1673-6. 

Methane (CH4) in the atmosphere is an important greenhouse gas. You wonder if this compound is degraded by bacteria that occur in the upper layers of oxic soils. You estimate that the diffusive flux of methane from the atmosphere (present at about... 

Bollmann A. and Conrad R. (1997) Acetylene blockage technique leads to underestimation of denitrification rates in oxic soils due to scavenging on intermediate nitric oxide. Soil Biol. Biochem. 29, 1067-1077. 

The long lifetime means that a significant fraction (see Figure 17) of the OCS is transferred to the stratosphere. Uptake by vegetation and deposition to soils are important loss processes, although the large uptake by oxic soils is particularly uncertain (Kjellstrom, 1998 Watts, 2000). 

Estimates of sources and sinks of CS2 are 0.66 0.19 Tgyr" and 1.01 0.45 Tg yr (Watts, 2000). The amounts that are destroyed through oxidation are probably similar to the amount that is lost to oxic soils (Watts, 2000). 

Green, R.E. Ahuja, L.R. Chong, S.K. Lau, L.S. Water Conduction in Hawaii Oxic Soils, Tech. Rep. 143, Univ. Hawaii Water Resour. Res. Center, 1982. 

In subsurface oxic soil near Los Alamos National Laboratory, USA, plutonium is relatively mobile and has been transported primarily by colloids in the 25-450 pm size range. Moreover, the association with these colloids is strong and removal of Pu from them is very slow. By contrast, near Sellafield in wet anoxic soil, most of the Pu is quickly immobilized in the sediments although a small fraction remain mobile. Differences in oxidation state (Pu(V) vs. Pu(lV)) as well as in humic content of the soils may explain these differences in mobility. 

Mobihty of iodine under anoxic soil conditions is markedly greater than under oxic conditions. Accumulations of iodine at the boundary between anoxic and oxic soil regions are likely to occur. 

Mobihty of iodine in oxic soils is low, leading to limited plant root uptake. 

Lead readily loses two electrons, yielding Pb " ", which hydrolyzes above pH 7. While Pb " " is the dominant inorganic species throughout the pH and Eh range of most natural waters (Fig. 1), sulfate, carbonate, chloride, and phosphate complexes of Pb can also be important, depending on the concentrations of these species and the pH of the solution [24]. Lead carbonate is an effective control on the solubility of Pb in oxic soils and sediments above pH values of 6 (Fig. 1). In... 

Bender, M., Conrad, R. 1993. Kinetics of methane oxidation in oxic soils. Chemosphere 26(1 ) 687-696. 

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