Seasonal patterns of soil nitrogen availability in moist acidic tundra
Our ability to predict effects of changing soil nitrogen (N) in Arctic tundra has been limited by our poor understanding of the intra-annual variability of soil N in this strongly seasonal ecosystem. Studies have shown that microbial biomass declines in spring accompanied by peaks in inorganic nutri...
Published in: | Arctic Science |
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Canadian Science Publishing
2018
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Online Access: | https://doi.org/10.1139/as-2017-0014 https://doaj.org/article/bb5f4808030441c09511f78e646d4c97 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:bb5f4808030441c09511f78e646d4c97 2023-05-15T14:22:22+02:00 Seasonal patterns of soil nitrogen availability in moist acidic tundra Jennie R. McLaren Anthony Darrouzet-Nardi Michael N. Weintraub Laura Gough 2018-03-01 https://doi.org/10.1139/as-2017-0014 https://doaj.org/article/bb5f4808030441c09511f78e646d4c97 en fr eng fre Canadian Science Publishing doi:10.1139/as-2017-0014 2368-7460 https://doaj.org/article/bb5f4808030441c09511f78e646d4c97 undefined Arctic Science, Vol 4, Iss 1, Pp 98-109 (2018) nitrogen availability nitrogen mineralization seasonality moist acidic tundra total free primary amines envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.1139/as-2017-0014 2023-01-22T18:17:17Z Our ability to predict effects of changing soil nitrogen (N) in Arctic tundra has been limited by our poor understanding of the intra-annual variability of soil N in this strongly seasonal ecosystem. Studies have shown that microbial biomass declines in spring accompanied by peaks in inorganic nutrients. However, subsequent to this early pulse, there are few high temporal resolution measurements during the growing season. We hypothesized that (1) low N would be maintained throughout the growing season, (2) peaks of total free primary amines (TFPA), ammonium (NH4+), and nitrate (NO3−) would follow a sequential pattern driven by mineralization and nitrification, and (3) a peak in soil N would occur as plants senesce. We conducted weekly measurements of TFPA, NH4+, and NO3− in two tundra sites, from soil thaw in spring to freeze in fall. At each site, NH4+ peaks were followed by smaller peaks in NO3−, supporting the hypothesis that excess NH4+ would be nitrified. Furthermore, peaks in NH4+ were observed both shortly after leaf expansion and at plant senescence. The variation in timing between sites and the peaks in NH4+ subsequent to thaw indicates that nutrient limitation in these ecosystems is more dynamic and spatially variable than previously thought. Article in Journal/Newspaper Arctic Arctic Tundra Unknown Arctic Arctic Science |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English French |
topic |
nitrogen availability nitrogen mineralization seasonality moist acidic tundra total free primary amines envir geo |
spellingShingle |
nitrogen availability nitrogen mineralization seasonality moist acidic tundra total free primary amines envir geo Jennie R. McLaren Anthony Darrouzet-Nardi Michael N. Weintraub Laura Gough Seasonal patterns of soil nitrogen availability in moist acidic tundra |
topic_facet |
nitrogen availability nitrogen mineralization seasonality moist acidic tundra total free primary amines envir geo |
description |
Our ability to predict effects of changing soil nitrogen (N) in Arctic tundra has been limited by our poor understanding of the intra-annual variability of soil N in this strongly seasonal ecosystem. Studies have shown that microbial biomass declines in spring accompanied by peaks in inorganic nutrients. However, subsequent to this early pulse, there are few high temporal resolution measurements during the growing season. We hypothesized that (1) low N would be maintained throughout the growing season, (2) peaks of total free primary amines (TFPA), ammonium (NH4+), and nitrate (NO3−) would follow a sequential pattern driven by mineralization and nitrification, and (3) a peak in soil N would occur as plants senesce. We conducted weekly measurements of TFPA, NH4+, and NO3− in two tundra sites, from soil thaw in spring to freeze in fall. At each site, NH4+ peaks were followed by smaller peaks in NO3−, supporting the hypothesis that excess NH4+ would be nitrified. Furthermore, peaks in NH4+ were observed both shortly after leaf expansion and at plant senescence. The variation in timing between sites and the peaks in NH4+ subsequent to thaw indicates that nutrient limitation in these ecosystems is more dynamic and spatially variable than previously thought. |
format |
Article in Journal/Newspaper |
author |
Jennie R. McLaren Anthony Darrouzet-Nardi Michael N. Weintraub Laura Gough |
author_facet |
Jennie R. McLaren Anthony Darrouzet-Nardi Michael N. Weintraub Laura Gough |
author_sort |
Jennie R. McLaren |
title |
Seasonal patterns of soil nitrogen availability in moist acidic tundra |
title_short |
Seasonal patterns of soil nitrogen availability in moist acidic tundra |
title_full |
Seasonal patterns of soil nitrogen availability in moist acidic tundra |
title_fullStr |
Seasonal patterns of soil nitrogen availability in moist acidic tundra |
title_full_unstemmed |
Seasonal patterns of soil nitrogen availability in moist acidic tundra |
title_sort |
seasonal patterns of soil nitrogen availability in moist acidic tundra |
publisher |
Canadian Science Publishing |
publishDate |
2018 |
url |
https://doi.org/10.1139/as-2017-0014 https://doaj.org/article/bb5f4808030441c09511f78e646d4c97 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic Tundra |
genre_facet |
Arctic Arctic Tundra |
op_source |
Arctic Science, Vol 4, Iss 1, Pp 98-109 (2018) |
op_relation |
doi:10.1139/as-2017-0014 2368-7460 https://doaj.org/article/bb5f4808030441c09511f78e646d4c97 |
op_rights |
undefined |
op_doi |
https://doi.org/10.1139/as-2017-0014 |
container_title |
Arctic Science |
_version_ |
1766294975905005568 |