N Storage and Cycling in Vegetation of a Forested Wetland: Implications for Watershed N Processing
نویسندگان
چکیده
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 watershed Nretention in the Adirondack Mountains of New York (U.S.A.). The majority of N storage occurred in forest soils and wetland peat deposits (96 and 99% of total N in upland forests and wetlands, respectively). Annual N-uptake (49 kg N ha−1 yr−1) was greater for wetland vegetation than that of upland vegetation (30 kg N ha−1 yr−1). In the wetland the supply of N from mineralization (36 kg N ha−1 yr−1) was less than N-uptake; in contrast, upland N mineralization (76 kg N ha−1 yr−1) exceeded N vegetation uptake. Annual N-storage in peat was small due to low peat accretion rates. Wetlands acted as a sink for N and stored a disproportionally high fraction (15%) of catchment N in relation to their relatively small surface area (∼4%) within the catchment.
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