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/...
Published in: | Hydrology and Earth System Sciences |
---|---|
Main Authors: | , |
Format: | Text |
Language: | English |
Published: |
2018
|
Subjects: | |
Online Access: | https://doi.org/10.5194/hess-6-351-2002 https://www.hydrol-earth-syst-sci.net/6/351/2002/ |
id |
ftcopernicus:oai:publications.copernicus.org:hess39543 |
---|---|
record_format |
openpolar |
spelling |
ftcopernicus:oai:publications.copernicus.org:hess39543 2023-05-15T15:18:08+02:00 Nitrogen dynamics in runoff from two small heathland catchments representing opposite extremes with respect to climate and N deposition in Norway Kaste, Ø. Skjelkvåle, B. L. 2018-09-27 application/pdf https://doi.org/10.5194/hess-6-351-2002 https://www.hydrol-earth-syst-sci.net/6/351/2002/ eng eng doi:10.5194/hess-6-351-2002 https://www.hydrol-earth-syst-sci.net/6/351/2002/ eISSN: 1607-7938 Text 2018 ftcopernicus https://doi.org/10.5194/hess-6-351-2002 2019-12-24T09:59:40Z 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 Text Arctic Northern Norway Copernicus Publications: E-Journals Arctic Norway Øygard ENVELOPE(8.517,8.517,62.500,62.500) Hydrology and Earth System Sciences 6 3 351 362 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
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 |
Text |
author |
Kaste, Ø. Skjelkvåle, B. L. |
spellingShingle |
Kaste, Ø. Skjelkvåle, B. L. Nitrogen dynamics in runoff from two small heathland catchments representing opposite extremes with respect to climate and N deposition in Norway |
author_facet |
Kaste, Ø. Skjelkvåle, B. L. |
author_sort |
Kaste, Ø. |
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 |
publishDate |
2018 |
url |
https://doi.org/10.5194/hess-6-351-2002 https://www.hydrol-earth-syst-sci.net/6/351/2002/ |
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 |
eISSN: 1607-7938 |
op_relation |
doi:10.5194/hess-6-351-2002 https://www.hydrol-earth-syst-sci.net/6/351/2002/ |
op_doi |
https://doi.org/10.5194/hess-6-351-2002 |
container_title |
Hydrology and Earth System Sciences |
container_volume |
6 |
container_issue |
3 |
container_start_page |
351 |
op_container_end_page |
362 |
_version_ |
1766348368778362880 |