N Storage and Cycling in Vegetation of a Forested Wetland: Implications for Watershed N Processing
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Pools and fluxes of N in wetland vegetation and soils were compared with an adjacent upland site to assess the relative importance of wetland versus upland landscapes in watershedN-retention in the Adirondack Mountains of New York (U.S.A.).The majority of N storage occurred in forest soils and wetlandpeat deposits (96 and 99% of total N in upland forests andwetlands, respectively). Annual N-uptake (49 kg N ha-1yr-1) was greater for wetland vegetation than that ofupland vegetation (30 kg N ha-1 yr-1). In the wetlandthe supply of N from mineralization (36 kg N ha-1yr-1) was less than N-uptake; in contrast, upland Nmineralization (76 kg N ha-1 yr-1) exceeded Nvegetation uptake. Annual N-storage in peat was small due to low peat accretion rates. Wetlands acted as a sink for N andstored a disproportionally high fraction (15%) of catchment Nin relation to their relatively small surface area (∼4%)within the catchment.
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