Nitrous oxide emission from Deyeuxia angustifolia freshwater marsh in northeast china.

Here we report N(2)O emission results for freshwater marshes isolated from human activities at the Sanjiang Experimental Station of Marsh Wetland Ecology in northeastern China. These results are important for us to understand N(2)O emission in natural processes in undisturbed freshwater marsh. Two adjacent plots of Deyeuxia angustifolia freshwater marsh with different water regimes, i.

Redox potential characterization and soil greenhouse gas concentration across a hydrological gradient in a Gulf coast forest.

Soil redox potential (Eh), concentrations of oxygen (O2) and three greenhouse gases (CO2, CH4, and N2O) were measured in the soil profile of a coastal forest at ridge, transition, and swamp across a hydrological gradient. The results delineated a distinct boundary in soil Eh and O2 concentration between the ridge and swamp with essentially no overlap between the two locations. Critical soil Eh to initiate significant CH4 production under this field conditions was about +300 mV, much higher than in the homogenous soils (about -150 mV).

From Wastelands to Wetlands.

When the Europeans first came to North America, they discovered vast expanses of fertile land in forests and prairies that would support the production of agricultural crops. Along with the upland fertile soils that lent themselves to clearing and farming, these settlers also encountered large areas of water-dominated lands that we now call wetlands. To the early settlers these wetland areas were for the most part wastelands and were generally considered to be unpleasant and unhealthy environments.