Selenium volatilization from tundra soils in maritime Antarctica

Methane emissions from two tundra wetlands in eastern Antarctica

During the summertime of 2005/2006 net methane ðCH4Þ fluxes and environmental variables were investigated in two tundra wetlands Wolong Marsh and Tuanjie Marsh of eastern Antarctica, using the closed chamber technique. At Wolong Marsh, the measurements were made at four wet tundra sites, four mesic tundra sites, and two dry sites. CH4 flux for wet tundra sites averaged 163:4mgm 2 h 1 and for th...

Plant and Bird Presence Strongly Influences the Microbial Communities in Soils of Admiralty Bay, Maritime Antarctica

Understanding the environmental factors that shape microbial communities is crucial, especially in extreme environments, like Antarctica. Two main forces were reported to influence Antarctic soil microbes: birds and plants. Both birds and plants are currently undergoing relatively large changes in their distribution and abundance due to global warming. However, we need to clearly understand the...

Selenium in Soils and Plants

Uptake, Metabolism, and Volatilization of Selenium by Terrestrial Plants

Selenium (Se) in irrigation drainage water became a major concern after it was implicated in deaths and deformities of waterfowl at Kesterson Reservoir (Presser and Ohlendorf 1987; Ohlendorf 1989). Subsequently, other areas with irrigationinduced Se problems (or potential problems) have been identified in several western U.S. states (Seiler 1995), reinforcing the status of Se as a U.S. Environm...

Nitrous oxide emissions from tundra soil and snowpack in the maritime Antarctic.

The nitrous oxide emissions were measured at three tundra sites and one snowpack on the Fildes Peninsula in the maritime Antarctic in the summertime of 2002. The average fluxes at two normal tundra sites were 1.1+/-2.2 and 0.6+/-1.7 microg N2O m(-2)h(-1), respectively. The average flux from tundra soil site with penguin dropping addition was 3.7+/-2.0 microg N2O m(-2)h(-1), 3-6 times those from...