Nitrogen dynamics in runoff from two small heathland catchments representing opposite extremes with respect to climate and N deposition in Norway
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/...
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ftdoajarticles:oai:doaj.org/article:9c9124d8cef84d06aa88ddd530cebb05 2023-05-15T15:18:15+02:00 Nitrogen dynamics in runoff from two small heathland catchments representing opposite extremes with respect to climate and N deposition in Norway Ø. Kaste B. L. Skjelkvåle 2002-01-01T00:00:00Z https://doaj.org/article/9c9124d8cef84d06aa88ddd530cebb05 EN eng Copernicus Publications http://www.hydrol-earth-syst-sci.net/6/351/2002/hess-6-351-2002.pdf https://doaj.org/toc/1027-5606 https://doaj.org/toc/1607-7938 1027-5606 1607-7938 https://doaj.org/article/9c9124d8cef84d06aa88ddd530cebb05 Hydrology and Earth System Sciences, Vol 6, Iss 3, Pp 351-362 (2002) Technology T Environmental technology. Sanitary engineering TD1-1066 Geography. Anthropology. Recreation G Environmental sciences GE1-350 article 2002 ftdoajarticles 2022-12-30T22:04:51Z 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 –1 y –1 ), whereas the Øygard site has a more mild, humid climate with much larger N deposition (13–19 kg N ha –1 yr –1 ). Streamwater nitrate (NO 3 ‾ ) 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, NO 3 ‾ 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 N 3 ‾ concentrations may indicate a relatively high NO 3 ‾ leaching potential in this catchment. On average, the annual NO 3 – export was negligible at Dalelva (<0.1 kg N ha –1 yr –1 ), while at Øygard it amounted to 3.0±0.3 (±1 s.d.) kg ha –1 yr –1 , or nearly 20% of the annual N deposition. In addition to this relatively high annual N loss, elevated NO 3 ‾ 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 Article in Journal/Newspaper Arctic Northern Norway Directory of Open Access Journals: DOAJ Articles Arctic Norway Øygard ENVELOPE(8.517,8.517,62.500,62.500) |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Technology T Environmental technology. Sanitary engineering TD1-1066 Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
spellingShingle |
Technology T Environmental technology. Sanitary engineering TD1-1066 Geography. Anthropology. Recreation G Environmental sciences GE1-350 Ø. Kaste B. L. Skjelkvåle Nitrogen dynamics in runoff from two small heathland catchments representing opposite extremes with respect to climate and N deposition in Norway |
topic_facet |
Technology T Environmental technology. Sanitary engineering TD1-1066 Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
description |
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 –1 y –1 ), whereas the Øygard site has a more mild, humid climate with much larger N deposition (13–19 kg N ha –1 yr –1 ). Streamwater nitrate (NO 3 ‾ ) 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, NO 3 ‾ 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 N 3 ‾ concentrations may indicate a relatively high NO 3 ‾ leaching potential in this catchment. On average, the annual NO 3 – export was negligible at Dalelva (<0.1 kg N ha –1 yr –1 ), while at Øygard it amounted to 3.0±0.3 (±1 s.d.) kg ha –1 yr –1 , or nearly 20% of the annual N deposition. In addition to this relatively high annual N loss, elevated NO 3 ‾ 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 |
format |
Article in Journal/Newspaper |
author |
Ø. Kaste B. L. Skjelkvåle |
author_facet |
Ø. Kaste B. L. Skjelkvåle |
author_sort |
Ø. Kaste |
title |
Nitrogen dynamics in runoff from two small heathland catchments representing opposite extremes with respect to climate and N deposition in Norway |
title_short |
Nitrogen dynamics in runoff from two small heathland catchments representing opposite extremes with respect to climate and N deposition in Norway |
title_full |
Nitrogen dynamics in runoff from two small heathland catchments representing opposite extremes with respect to climate and N deposition in Norway |
title_fullStr |
Nitrogen dynamics in runoff from two small heathland catchments representing opposite extremes with respect to climate and N deposition in Norway |
title_full_unstemmed |
Nitrogen dynamics in runoff from two small heathland catchments representing opposite extremes with respect to climate and N deposition in Norway |
title_sort |
nitrogen dynamics in runoff from two small heathland catchments representing opposite extremes with respect to climate and n deposition in norway |
publisher |
Copernicus Publications |
publishDate |
2002 |
url |
https://doaj.org/article/9c9124d8cef84d06aa88ddd530cebb05 |
long_lat |
ENVELOPE(8.517,8.517,62.500,62.500) |
geographic |
Arctic Norway Øygard |
geographic_facet |
Arctic Norway Øygard |
genre |
Arctic Northern Norway |
genre_facet |
Arctic Northern Norway |
op_source |
Hydrology and Earth System Sciences, Vol 6, Iss 3, Pp 351-362 (2002) |
op_relation |
http://www.hydrol-earth-syst-sci.net/6/351/2002/hess-6-351-2002.pdf https://doaj.org/toc/1027-5606 https://doaj.org/toc/1607-7938 1027-5606 1607-7938 https://doaj.org/article/9c9124d8cef84d06aa88ddd530cebb05 |
_version_ |
1766348459091165184 |