Concentrations and controls of soil carbon dioxide in sandy soil in the North Carolina coastal plain

Response of soil CO2 and O2 concentrations to forest soil compaction at the Long-term Soil Productivity sites in central British Columbia

“…Differences in soil CO 2 gas levels were also influenced by the year in which samples were collected. Average concentrations of CO 2 gas were much higher across all sites in 1996 than in 1994 and 1995 when levels were equivalent to those seen in other field studies (Russell and Appleyard 1915;Buyanovsky and Wagner 1983;Fernandez and Kosian 1987;Castelle and Galloway 1990;Zabowski and Sletten 1991;Kiefer and Amey 1992). The implications that these results have for the future growth of trees on the LTSP sites are twofold.…”

Temporal dynamics of groundwater-dissolved inorganic carbon beneath a drought-affected braided stream: Platte River case study

“…Therefore, if soil CO 2 was the source of HCO 3 − over the study period, an increase in gaseous p CO 2 sufficient to overcome the temperature effect on the Henry's law coefficient would be necessary to explain the observed increase in HCO 3 − . This is considered to be a plausible mechanism given that soil respiration rates have previously been found to be positively related to soil temperature [ Kiefer and Amey , ; Lloyd and Taylor , ; Hendry et al , ; Karberg et al , ]. Although soil temperature was not measured in this study, the measured increase in water temperature (Figure a) is indicative of increasing soil temperatures.…”

“…This model indicates that a relatively modest increase in soil p CO 2 could result in the measured change in groundwater HCO 3 − . The range of p CO 2 values needed for the given increase in HCO 3 − in each piezometer is reasonable for soil zone partial pressures [ Brooke et al , ; Kiefer and Amey , ]. Sufficient CO 2 production in the saturated zone appears less likely than CO 2 production in the unsaturated zone to cause the estimated increase in HCO 3 − , given that dissolved O 2 concentrations indicated suboxic conditions in the saturated zone and that concentrations of NO 3 − (another possible electron acceptor) were likely too low for significant organic matter oxidation to occur (mean island porewater concentration was <1.3 mg L −1 NO 3 ‐N).…”

Radon, helium and CO2 measurements in soils overlying a former exploited oilfield, Pechelbronn district, Bas-Rhin, France

“…However, some of them remain quite important regarding available data in the literature. For instance, Kiefer and Amey (1992) measured in the late summer a maximum CO 2 concentration of 2% in the sandy North Carolina Coastal Plain, within the variation range (0.03e4.17%) measured by Brook et al (1983). Hamada and Tanaka (2001) found concentrations only reaching 0.87% at 1 m depth in August in Japan.…”

“…Soil texture may be one of these mechanisms (e.g., Kiefer and Amey, 1992): all the CO 2 concentrations greater than 6.6% were found in embankments, suggesting the existence of a soil modified structure that allowed gas enrichment. Since anthropogenic organic layers should differ from natural ones, the existence of an upper organic-rich layer acting as a barrier (Bekele et al, 2007), or the existence of a clay-rich interface lying on top of the reworked materials (Kiefer and Amey, 1992), could lead to such elevated concentrations.…”