Abstract
Nitrogen (N) budget was estimated with dissolved inorganic N (DIN) and dissolved organic N (DON) in a forested mountainous watershed in Tsukui, Kanagawa Prefecture, about 50 km west of Tokyo in Central Japan. The forest vegetation in the watershed was dominant by Konara oak (Quercus serrata) and Korean hornbeam (Carpinus tschonoskii), and Japanese cedar (Cryptomeria japonica). Nitrate (NO3 −) concentration in the watershed streamwater was averagely high (98.0 ±± 19 (±± SD, n = 36) μmol L−1) during 2001–2003. There was no seasonal and annual changes in the stream NO− 3 concentration even though the highest N uptake rate presumably occurred during the spring of plant growing season, a fact indicating that N availability was in excess of biotic demands. The DON deposition rates (DON input rates) in open area and forest area were estimated as one of the main N sources, accounting for about 32% of total dissolved N (TDN). It was estimated that a part of the DON input rate contributed to the excessive stream NO− 3 output rate under the condition of the rapid mineralization and nitrification rates, which annual DON deposition rates were positively correlated with the stream NO3 − output rates. The DON retention rate in the DON budget had a potential capacity, which contributed to the excessive stream NO− 3 output rate without other N contributions (e.g. forest floor N or soil N).
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Ham, YS., Tamiya, S. & Choi, IS. Contribution of dissolved organic nitrogen deposition to nitrogen saturation in a forested mountainous watershed in Tsukui, Central Japan. Water Air Soil Pollut 178, 113–120 (2007). https://doi.org/10.1007/s11270-006-9160-8
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DOI: https://doi.org/10.1007/s11270-006-9160-8