Denitrification rates in lake sediments of mountains affected by high atmospheric nitrogen deposition

Denitrification kinetics and denitrifier abundances in sediments of lakes receiving atmospheric nitrogen deposition (Colorado, USA)

The transport and deposition of anthropogenic nitrogen (N) to downwind ecosystems is significant and can be a dominant source of new N to many watersheds. Bacterially mediated denitrification in lake sediments may ameliorate the effects of N loading by permanently removing such inputs. We measured denitrification in sediments collected from lakes in the Colorado Rocky Mountains (USA) receiving ...

Long-term atmospheric deposition of nitrogen, phosphorus and sulfate in a large oligotrophic lake

We documented significantly increasing trends in atmospheric loading of ammonium (NH4) and nitrate/nitrite (NO2/3) and decreasing trends in total phosphorus (P) and sulfate (SO4) to Flathead Lake, Montana, from 1985 to 2004. Atmospheric loading of NO2/3 and NH4 increased by 48 and 198% and total P and SO4 decreased by 135 and 39%. The molar ratio of TN:TP also increased significantly. Severe ai...

Sunflower summer-planting yield as affected by plant population and nitrogen application rates

Operational mapping of atmospheric nitrogen deposition

Operational mapping of atmospheric nitrogen deposition to the Baltic Sea O. Hertel, C. Ambelas Skjøth, J. Brandt, J. H. Christensen, L. M. Frohn, and J. Frydendall National Environmental Research Institute, Department of Atmospheric Environment, P.O. Box 358, Frederiksborgvej 399, 4000 Roskilde, Denmark Received: 17 October 2002 – Accepted: 27 June 2003 – Published: 8 July 2003 Correspondence t...

Denitrification in sediments of headwater streams in the southern Appalachian Mountains, USA