nitrogen dynamics in runoff from two small heathland catchments representing opposite extremes with respect to climate and n deposition in norway

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ID: 239607
2002
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Abstract
Effects of contrasting climatic conditions and nitrogen (N) deposition levels on streamwater N dynamics are assessed at two small heathland catchments; Dalelva in northern Norway (69°N) and Øygard in southwestern Norway (58°N). The study comprises 11 years of data on climate, hydrology and N inputs/outputs from Dalelva and 8 years of corresponding data from Øygard. Both sites are comparable in catchment size, geology and land cover characteristics, but have large differences in climate and N deposition. Dalelva is characterised by a cold, arctic climate and low N deposition (2-3 kg N ha–1y–1), whereas the Øygard site has a more mild, humid climate with much larger N deposition (13–19 kg N ha–1yr–1). Streamwater nitrate (NO3‾) concentrations at Dalelva generally were negligible during the growing season, but showed a steady increase during the dormant season until a maximum of 40-100 μg N L–1 was reached just before snowmelt. At onset of the snowmelt flood, NO3‾ concentrations decreased momentarily to very low levels, suggesting that N eluted from the seasonal snowpack to a great extent was infiltrated and immobilised in the soils. At Øygard, flood peaks occurred frequently during all seasons, and usually there was no distinct spring flood. A lack of clear dilution effects from floods on streamwater N3‾ concentrations may indicate a relatively high NO3‾ leaching potential in this catchment. On average, the annual NO3– export was negligible at Dalelva (<0.1 kg N ha–1yr–1), while at Øygard it amounted to 3.0±0.3 (±1 s.d.) kg ha–1yr–1, or nearly 20% of the annual N deposition. In addition to this relatively high annual N loss, elevated NO3‾ concentrations during the growing season further indicate that the N supply at Øygard is in excess of the combined plant and microbial demand.

Keywords: catchments, surface water, nitrogen deposition, nitrate leaching, climate, hydrology, snowmelt, Dalelva brook, Øygard brook

Reference Key
kaste2002hydrologynitrogen Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Ø. Kaste;Ø. Kaste;B. L. Skjelkvåle;B. L. Skjelkvåle
Journal materials research bulletin
Year 2002
DOI
DOI not found
URL
http://www.hydrol-earth-syst-sci.net/6/351/2002/hess-6-351-2002.pdf
Keywords
anthropology recreationenvironmental sciences sanitary engineeringgeography technologyenvironmental technology

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