Abstract
Two models, N_EXRET and INCA, were applied to the Simojoki river basin (3160 km2) in northern Finland in order to assess nitrogen retention in wetlands and lakes. N_EXRET is a spatial, export coefficient-based N export and retention model developed for large river basins. It utilizes remote sensing-based land use and forest classification, evaluated export coefficients, and data on areal N deposition and point sources of N. A new version (vl.7) of the Integrated Nitrogen in CAtchments model (INCA) is a semi-distributed, dynamic nitrogen process model, which simulates and predicts nitrogen transport and processes within catchments. Average retention of the gross total N load of 700 t a−1 to the river system was estimated using N_EXRET model as 17 t N a−1 to the wetlands and 77 t N a−1 to the lakes. A good fit was found between modeled and measured values along the river. Inorganic N fluxes simulated by the INCA model were compared with measured fluxes along the river Simojoki, with a good fit between modeled and measured NH +4 -N fluxes, and an adequate fit for NO −3 -N fluxes. Both fluxes were overestimated at the first reach, below Lake Simojärvi. High percentage of peatlands led to high NH +4 -N/NO −3 -N ratios derived from data, indicating negligible nitrification in large river subbasins and particularly in small research catchments.
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Lepistö, A., Granlund, K., Rankinen, K. (2004). Integrated Nitrogen Modeling in a Boreal Forestry Dominated River Basin: N Fluxes and Retention in Lakes and Peatlands. In: Wieder, R.K., Novák, M., Vile, M.A. (eds) Biogeochemical Investigations of Terrestrial, Freshwater, and Wetland Ecosystems across the Globe. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-0952-2_9
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DOI: https://doi.org/10.1007/978-94-007-0952-2_9
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