Predicting the Effects of Atmospheric Nitrogen Deposition in Conifer Stands: Evidence from the NITREX Ecosystem-Scale Experiments

Changes in nitrogen cycling during the past century in a northern hardwood forest

“…H umans have increased the amount of reactive N on earth (1), leading to negative environmental consequences that include reduced forest growth and eutrophication of surface waters (2). In contrast to Europe, where anthropogenic N deposition is generally greater, the consequences in northeastern North American forests are less clear because there has been little obvious evidence of forest eutrophication.…”

Response of Nitrogen Leaching to Nitrogen Deposition in Disturbed and Mature Forests of Southern China

“…A great number of studies on N deposition have been carried out in Europe and North America, where industrial development occur earliest (Matson et al, 1999;Galloway et al, 2003). Results have shown that in predominately N-limited temperate forests in these regions, the experimental and atmospheric N inputs had dramatically altered ecosystem processes and properties, including forest productivity, soil fertility, species composition, litter decomposition, and N loss from soils to groundwater and atmosphere Kahl et al, 1993;Magill et al, 1996Magill et al, , 2000Magill et al, , 2004Emmett et al, 1998;Fenn et al, 1998;Gundersen, 1998;Gundersen et al, 1998Gundersen et al, , 2006Hall and Matson, 2003).…”

Partitioning of atmospheric nitrogen under long-term reduced atmospheric deposition conditions in a Norway spruce forest ecosystem

“…The higher nitrate leaching at Speuld was caused by lower C/N ratio of organic layer (21, as compared to 25 in the roof control plot) combined with higher N deposition (44 kg ha -1 yr -1 ). The lower C/N ratio indicates more active nitrification as well as lower retention capacity of the soil for deposited and internally generated nitrate (Emmett et al 1998b).…”