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An open-top-chamber (OTC)CO2 enrichment (~720 mmolmol-1) study was conducted in the Colorado shortgrass steppe from April 1997 through October 2001.Aboveground plant biomass increased under elevated CO2 and soil moisture content wastypically higher than under ambient CO2 conditions. Fluxes ofCH4, CO2,NOx and N2O,measured weekly year round were not significantly altered by CO2 enrichment over the 55month period of observation. During early summer of 2002, following the removal of theopen-top-chambers from the CO2 enrichment sites in October 2001, we conducted a shortterm study to determine if soil microbial processes were altered in soils that had been exposedto double ambient CO2 concentrations during the growing season for the past five years.Microplots were established within each experimental site and 10 mm of water or10 mm of water containing the equivalent of 10 g m-2 of ammonium nitrate-N was applied to the soilsurface. Fluxes of CO2,CH4, NOx and N2O fluxes within control(unchambered), ambient CO2 and elevatedCO2OTC soils were measured at one to three day intervals for the nextmonth. With water addition alone, CO2 and NO emission did not differ between ambient andelevated CO2 soils, whileCH4 uptake rates were higher and N2O fluxes lower in elevatedCO2soils. Adding water and mineral N resulted in increased CO2 emissions, increasedCH4 uptake and decreased NO emissions in elevated CO2 soils. The N addition study confirmedprevious observations that soil respiration is enhanced under elevated CO2 and Nimmobilization is increased, thereby decreasing NO emission

atmospheric chemistry and physics

Effect of water addition and nitrogen fertilization on the fluxes of CH&amp;lt;sub&amp;gt;4&amp;lt;/sub&amp;gt;, CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;, NO&amp;lt;sub&amp;gt;x&amp;lt;/sub&amp;gt;, and N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O following five years of elevated CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; in the Colorado Shortgrass Steppe