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Nitrogen leaching from European forests in relation to nitrogen deposition

Nitrogen leaching from European forests in relation to nitrogen deposition,10.1016/0378-1127(94)06092-W,Forest Ecology and Management,N. B. Dise,R. F.

Nitrogen leaching from European forests in relation to nitrogen deposition   (Citations: 257)
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Forests in Europe currently receive inorganic nitrogen deposition (wet and dry) ranging from less than 1 to more than 75 kg N ha−1 year−1. A survey of nitrogen output from 65 forested plots and catchments throughout Europe indicated a three-stage response to these inputs. Below a deposition threshold of about 10 kg N ha−1 year−1 no significant nitrogen leaching occurred from the forests; at intermediate levels of 10–25 kg N ha−1 year−1 leaching occurred at some sites; above 25 kg ha−1 year−1 significant leaching occurred at all sites. NITREX sites followed this larger European pattern. Among 41 different variables tested in the survey, output-N (seepage or runoff) was most highly correlated with input-N (r2=0.69), followed by input-SO4, soil pH (negative correlation), percent slope, bedrock type and latitude (negative correlation). The latter three, however, were highly intercorrelated with input-N. A combination of input-N and soil pH explained 87% of the variability in output-N (N = 20) and predicted output-N successfully from NITREX sites and other European test sites.
Journal: Forest Ecology and Management - FOREST ECOL MANAGE , vol. 71, no. 1, pp. 153-161, 1995
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