Nitrogen dynamics in a small arctic watershed: retention and downhill movement of 15N
Author Posting. © The Author(s), 2009. This is the author's version of the work. It is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecological Monographs 80 (2010): 331-351, doi:10.1890/08-0773.1. We...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/3903 2023-05-15T14:59:07+02:00 Nitrogen dynamics in a small arctic watershed: retention and downhill movement of 15N Yano, Yuriko Shaver, Gaius R. Giblin, Anne E. Rastetter, Edward B. Nadelhoffer, Knute J. 2009-06-12 application/vnd.ms-excel application/pdf https://hdl.handle.net/1912/3903 en_US eng https://doi.org/10.1890/08-0773.1 https://hdl.handle.net/1912/3903 15NH4 Arctic tundra watershed Total dissolved N Downhill transport of N Hydrolysable amino acids Hydrolysable amino sugars Mosses N dynamics N immobilization N leaching N limitation Snowmelt Preprint 2009 ftwhoas https://doi.org/10.1890/08-0773.1 2022-05-28T22:58:07Z Author Posting. © The Author(s), 2009. This is the author's version of the work. It is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecological Monographs 80 (2010): 331-351, doi:10.1890/08-0773.1. We examined short- and long-term nitrogen (N) dynamics and availability along an arctic hillslope in Alaska, USA, using stable isotope of nitrogen (15N), as a tracer. Tracer levels of 15NH4+ were sprayed once onto the tundra at six sites in four tundra types; heath (crest), tussock with high and low water flux (mid- and foot-slope), and wet sedge (riparian). 15N in vegetation and soil was monitored to estimate retention and loss over a 3-yr period. Nearly all 15NH4+ was immediately retained in the surface moss-detritus-plant layer and > 57 % of the 15N added remained in this layer at the end of the second year. Organic soil was the second largest 15N sink. By the end of the third growing season, the moss-detritus-plant layer and organic soil combined retained ≥ 87 % of the 15N added except at the mid-slope site with high water flux, where recovery declined to 68 %. At all sites, non-extractable and non-labile-N pools were the principal sinks for added 15N in the organic soil. Hydrology played an important role in downslope movement of dissolved 15N. Crest and mid-slope with high water flux sites were most susceptible to 15N losses via leaching perhaps because of deep permeable mineral soil (crest) and high water flow (mid-slope with high water flux). Late spring melt-season also resulted in downslope dissolved-15N losses, perhaps because of an asynchrony between N release into melt water and soil immobilization capacity. We conclude that separation of the rooting zone from the strong sink for incoming N in the moss detritus-plant layer, rapid incorporation of new N into relatively recalcitrant soil-N pools within the rooting zone, and leaching loss from the upper hillslope would all contribute to the strong N limitation ... Report Arctic Tundra Alaska Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Arctic Ecological Monographs 80 2 331 351 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
15NH4 Arctic tundra watershed Total dissolved N Downhill transport of N Hydrolysable amino acids Hydrolysable amino sugars Mosses N dynamics N immobilization N leaching N limitation Snowmelt |
spellingShingle |
15NH4 Arctic tundra watershed Total dissolved N Downhill transport of N Hydrolysable amino acids Hydrolysable amino sugars Mosses N dynamics N immobilization N leaching N limitation Snowmelt Yano, Yuriko Shaver, Gaius R. Giblin, Anne E. Rastetter, Edward B. Nadelhoffer, Knute J. Nitrogen dynamics in a small arctic watershed: retention and downhill movement of 15N |
topic_facet |
15NH4 Arctic tundra watershed Total dissolved N Downhill transport of N Hydrolysable amino acids Hydrolysable amino sugars Mosses N dynamics N immobilization N leaching N limitation Snowmelt |
description |
Author Posting. © The Author(s), 2009. This is the author's version of the work. It is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecological Monographs 80 (2010): 331-351, doi:10.1890/08-0773.1. We examined short- and long-term nitrogen (N) dynamics and availability along an arctic hillslope in Alaska, USA, using stable isotope of nitrogen (15N), as a tracer. Tracer levels of 15NH4+ were sprayed once onto the tundra at six sites in four tundra types; heath (crest), tussock with high and low water flux (mid- and foot-slope), and wet sedge (riparian). 15N in vegetation and soil was monitored to estimate retention and loss over a 3-yr period. Nearly all 15NH4+ was immediately retained in the surface moss-detritus-plant layer and > 57 % of the 15N added remained in this layer at the end of the second year. Organic soil was the second largest 15N sink. By the end of the third growing season, the moss-detritus-plant layer and organic soil combined retained ≥ 87 % of the 15N added except at the mid-slope site with high water flux, where recovery declined to 68 %. At all sites, non-extractable and non-labile-N pools were the principal sinks for added 15N in the organic soil. Hydrology played an important role in downslope movement of dissolved 15N. Crest and mid-slope with high water flux sites were most susceptible to 15N losses via leaching perhaps because of deep permeable mineral soil (crest) and high water flow (mid-slope with high water flux). Late spring melt-season also resulted in downslope dissolved-15N losses, perhaps because of an asynchrony between N release into melt water and soil immobilization capacity. We conclude that separation of the rooting zone from the strong sink for incoming N in the moss detritus-plant layer, rapid incorporation of new N into relatively recalcitrant soil-N pools within the rooting zone, and leaching loss from the upper hillslope would all contribute to the strong N limitation ... |
format |
Report |
author |
Yano, Yuriko Shaver, Gaius R. Giblin, Anne E. Rastetter, Edward B. Nadelhoffer, Knute J. |
author_facet |
Yano, Yuriko Shaver, Gaius R. Giblin, Anne E. Rastetter, Edward B. Nadelhoffer, Knute J. |
author_sort |
Yano, Yuriko |
title |
Nitrogen dynamics in a small arctic watershed: retention and downhill movement of 15N |
title_short |
Nitrogen dynamics in a small arctic watershed: retention and downhill movement of 15N |
title_full |
Nitrogen dynamics in a small arctic watershed: retention and downhill movement of 15N |
title_fullStr |
Nitrogen dynamics in a small arctic watershed: retention and downhill movement of 15N |
title_full_unstemmed |
Nitrogen dynamics in a small arctic watershed: retention and downhill movement of 15N |
title_sort |
nitrogen dynamics in a small arctic watershed: retention and downhill movement of 15n |
publishDate |
2009 |
url |
https://hdl.handle.net/1912/3903 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Tundra Alaska |
genre_facet |
Arctic Tundra Alaska |
op_relation |
https://doi.org/10.1890/08-0773.1 https://hdl.handle.net/1912/3903 |
op_doi |
https://doi.org/10.1890/08-0773.1 |
container_title |
Ecological Monographs |
container_volume |
80 |
container_issue |
2 |
container_start_page |
331 |
op_container_end_page |
351 |
_version_ |
1766331261227368448 |