Contrasting effects of long term versus short-term nitrogen addition on photosynthesis and respiration in the Arctic
Author Posting. © The Author(s), 2013. This is the author's version of the work. It is posted here by permission of Springer for personal use, not for redistribution. The definitive version was published in Plant Ecology 214 (2013): 1273-1286, doi:10.1007/s11258-013-0250-6. We examined the effe...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/6311 2023-05-15T14:48:42+02:00 Contrasting effects of long term versus short-term nitrogen addition on photosynthesis and respiration in the Arctic van de Weg, Martine J. Shaver, Gaius R. Salmon, Verity G. 2013-07 application/pdf https://hdl.handle.net/1912/6311 en_US eng https://doi.org/10.1007/s11258-013-0250-6 https://hdl.handle.net/1912/6311 Nitrogen use efficiency Fertilisation LTER Alaska Chlorophyll Canopy Leaf mass per area Preprint 2013 ftwhoas https://doi.org/10.1007/s11258-013-0250-6 2022-05-28T22:58:58Z Author Posting. © The Author(s), 2013. This is the author's version of the work. It is posted here by permission of Springer for personal use, not for redistribution. The definitive version was published in Plant Ecology 214 (2013): 1273-1286, doi:10.1007/s11258-013-0250-6. We examined the effects of short (<1 to 4 years) and long-term (22 years) nitrogen (N) and/or phosphorus (P) addition on the foliar CO2 exchange parameters of the arctic species Betula nana and Eriophorum vaginatum in northern Alaska. Measured variables included: the carboxylation efficiency of Rubisco (Vcmax), electron transport capacity (Jmax), dark respiration (Rd), chlorophyll a and b content (Chl), and total foliar N (N). For both B. nana and E. vaginatum, foliar N increased by 20-50% as a consequence of 1 to 22 years of fertilisation, respectively, and for B. nana foliar Nincrease was consistent throughout the whole canopy. However, despite this large increase in foliar N, no significant changes in Vcmax and Jmax were observed. In contrast, Rd was significantly higher (>25%) in both species after 22 years of N addition, but not in the shorter-term treatments. Surprisingly, Chl only increased in both species the first year of fertilisation (i.e. the first season of nutrients applied), but not in the longer-term treatments. These results imply that: 1) Under current (low) N availability, these Arctic species either already optimize their photosynthetic capacity per leaf area, or are limited by other nutrients; 2) Observed increases in Arctic NEE and GPP with increased nutrient availability are caused by structural changes like increased leaf area index, rather than increased foliar photosynthetic capacity and 3) Short-term effects (1-4 years) of nutrient addition cannot always be extrapolated to a larger time scale, which emphasizes the importance of long-term ecological experiments. This work was funded by NSF grants from the division of Environmental Biology (Arctic LTER Project) and from the office of Polar Programs (Arctic ... Report Arctic Betula nana Eriophorum Alaska Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Arctic Plant Ecology 214 10 1273 1286 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Nitrogen use efficiency Fertilisation LTER Alaska Chlorophyll Canopy Leaf mass per area |
spellingShingle |
Nitrogen use efficiency Fertilisation LTER Alaska Chlorophyll Canopy Leaf mass per area van de Weg, Martine J. Shaver, Gaius R. Salmon, Verity G. Contrasting effects of long term versus short-term nitrogen addition on photosynthesis and respiration in the Arctic |
topic_facet |
Nitrogen use efficiency Fertilisation LTER Alaska Chlorophyll Canopy Leaf mass per area |
description |
Author Posting. © The Author(s), 2013. This is the author's version of the work. It is posted here by permission of Springer for personal use, not for redistribution. The definitive version was published in Plant Ecology 214 (2013): 1273-1286, doi:10.1007/s11258-013-0250-6. We examined the effects of short (<1 to 4 years) and long-term (22 years) nitrogen (N) and/or phosphorus (P) addition on the foliar CO2 exchange parameters of the arctic species Betula nana and Eriophorum vaginatum in northern Alaska. Measured variables included: the carboxylation efficiency of Rubisco (Vcmax), electron transport capacity (Jmax), dark respiration (Rd), chlorophyll a and b content (Chl), and total foliar N (N). For both B. nana and E. vaginatum, foliar N increased by 20-50% as a consequence of 1 to 22 years of fertilisation, respectively, and for B. nana foliar Nincrease was consistent throughout the whole canopy. However, despite this large increase in foliar N, no significant changes in Vcmax and Jmax were observed. In contrast, Rd was significantly higher (>25%) in both species after 22 years of N addition, but not in the shorter-term treatments. Surprisingly, Chl only increased in both species the first year of fertilisation (i.e. the first season of nutrients applied), but not in the longer-term treatments. These results imply that: 1) Under current (low) N availability, these Arctic species either already optimize their photosynthetic capacity per leaf area, or are limited by other nutrients; 2) Observed increases in Arctic NEE and GPP with increased nutrient availability are caused by structural changes like increased leaf area index, rather than increased foliar photosynthetic capacity and 3) Short-term effects (1-4 years) of nutrient addition cannot always be extrapolated to a larger time scale, which emphasizes the importance of long-term ecological experiments. This work was funded by NSF grants from the division of Environmental Biology (Arctic LTER Project) and from the office of Polar Programs (Arctic ... |
format |
Report |
author |
van de Weg, Martine J. Shaver, Gaius R. Salmon, Verity G. |
author_facet |
van de Weg, Martine J. Shaver, Gaius R. Salmon, Verity G. |
author_sort |
van de Weg, Martine J. |
title |
Contrasting effects of long term versus short-term nitrogen addition on photosynthesis and respiration in the Arctic |
title_short |
Contrasting effects of long term versus short-term nitrogen addition on photosynthesis and respiration in the Arctic |
title_full |
Contrasting effects of long term versus short-term nitrogen addition on photosynthesis and respiration in the Arctic |
title_fullStr |
Contrasting effects of long term versus short-term nitrogen addition on photosynthesis and respiration in the Arctic |
title_full_unstemmed |
Contrasting effects of long term versus short-term nitrogen addition on photosynthesis and respiration in the Arctic |
title_sort |
contrasting effects of long term versus short-term nitrogen addition on photosynthesis and respiration in the arctic |
publishDate |
2013 |
url |
https://hdl.handle.net/1912/6311 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Betula nana Eriophorum Alaska |
genre_facet |
Arctic Betula nana Eriophorum Alaska |
op_relation |
https://doi.org/10.1007/s11258-013-0250-6 https://hdl.handle.net/1912/6311 |
op_doi |
https://doi.org/10.1007/s11258-013-0250-6 |
container_title |
Plant Ecology |
container_volume |
214 |
container_issue |
10 |
container_start_page |
1273 |
op_container_end_page |
1286 |
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1766319795155763200 |