Chapman, P. J. Macaulay Land Use Research Institute, 00-44-1224-311556
Edwards, A. J. Macaulay Land Use Research Institute, 00-44-1224-311556
Reynolds, B. Institute of Terrestrial Ecology, 00-44-1248-355365
FACTORS INFLUENCING DISSOLVED ORGANIC NITROGEN AND NITRATE IN UPLAND STREAMS OF BRITAIN
Studies of the behavior and transport of nitrogen in freshwaters have focused primarily on inorganic species almost to the exclusion of the organic forms. While this situation may be acceptable for agricultural watersheds where nitrification is prevalent and therefore nitrate dominant. In temperate upland areas, where organic soils dominate a large range of nitrogen containing organic composunds can be present in freshwaters.
A survey of sixty headwater streams was, therefore, undertaken to investigate the variation in nitrogen forms and their conentration in relation to watershed attributes.For each watershed, data on soil type, land use, precipitation and temperature have been compiled. Water samples were collected monthly for one year and analysed for inorganic and organic forms of soluble and particulate nitrogen and dissolved organic carbon.
This paper will discuss: (a) the relative contribution of organic nitrogen to total nitrogen concentrations and fluxes in five contrasting upland areas of Britain, (b) the spatial distribution of soluble nitrogen forms in relation to watershed attributes, (c) the seasonal variability of dissolved organic nitrogen and nitrate, (d) the relationship between dissolved organic nitrogen and dissolved organic carbon, and (e) implications that the findings have for nitrogen cycling in temperate upland ecosystems.
Day: Wednesday, Feb. 3
Time: 09:45 - 10:00am
Location: Sweeney Center