Modeling the effects of organic nitrogen uptake by plants on the carbon cycling of boreal forest and tundra ecosystems
Boreal forest and tundra are the major ecosystems in the northern high latitudes in which a large amount of carbon is stored. These ecosystems are nitrogen-limited due to slow mineralization rate of the soil organic nitrogen. Recently, abundant field studies have found that organic nitrogen is anoth...
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ftdoajarticles:oai:doaj.org/article:87baddeccd3e4cc38f31098acce96b98 2023-05-15T18:39:38+02:00 Modeling the effects of organic nitrogen uptake by plants on the carbon cycling of boreal forest and tundra ecosystems Q. Zhu Q. Zhuang 2013-12-01T00:00:00Z https://doi.org/10.5194/bg-10-7943-2013 https://doaj.org/article/87baddeccd3e4cc38f31098acce96b98 EN eng Copernicus Publications http://www.biogeosciences.net/10/7943/2013/bg-10-7943-2013.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-10-7943-2013 https://doaj.org/article/87baddeccd3e4cc38f31098acce96b98 Biogeosciences, Vol 10, Iss 12, Pp 7943-7955 (2013) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2013 ftdoajarticles https://doi.org/10.5194/bg-10-7943-2013 2022-12-30T22:09:36Z Boreal forest and tundra are the major ecosystems in the northern high latitudes in which a large amount of carbon is stored. These ecosystems are nitrogen-limited due to slow mineralization rate of the soil organic nitrogen. Recently, abundant field studies have found that organic nitrogen is another important nitrogen supply for boreal forest and tundra ecosystems. In this study, we incorporated a mechanism that allowed boreal plants to uptake small molecular amino acids into a process-based biogeochemical model, the Terrestrial Ecosystem Model (TEM), to evaluate the impact of organic nitrogen uptake on ecosystem carbon cycling. The new version of the model was evaluated for both boreal forest and tundra sites. We found that the modeled organic nitrogen uptake accounted for 36–87% of total nitrogen uptake by plants in tundra ecosystems and 26–50% for boreal forests, suggesting that tundra ecosystem might have more relied on the organic form of nitrogen than boreal forests. The simulated monthly gross ecosystem production (GPP) and net ecosystem production (NEP) tended to be larger with the new version of the model since the plant uptake of organic nitrogen alleviated the soil nitrogen limitation especially during the growing season. The sensitivity study indicated that the most important factors controlling the plant uptake of organic nitrogen was the soil amino acid diffusion coefficient ( D e ) in our model, suggesting that the organic nitrogen uptake by plants is likely to be regulated by the edaphic characteristics of diffusion. The model uncertainty due to uncertain parameters associated with organic nitrogen uptake of the tundra ecosystem was larger than the boreal forest ecosystems. This study suggests that considering the organic nitrogen uptake by plants is important to carbon modeling of boreal forest and tundra ecosystems. Article in Journal/Newspaper Tundra Directory of Open Access Journals: DOAJ Articles Biogeosciences 10 12 7943 7955 |
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Directory of Open Access Journals: DOAJ Articles |
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English |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 Q. Zhu Q. Zhuang Modeling the effects of organic nitrogen uptake by plants on the carbon cycling of boreal forest and tundra ecosystems |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Boreal forest and tundra are the major ecosystems in the northern high latitudes in which a large amount of carbon is stored. These ecosystems are nitrogen-limited due to slow mineralization rate of the soil organic nitrogen. Recently, abundant field studies have found that organic nitrogen is another important nitrogen supply for boreal forest and tundra ecosystems. In this study, we incorporated a mechanism that allowed boreal plants to uptake small molecular amino acids into a process-based biogeochemical model, the Terrestrial Ecosystem Model (TEM), to evaluate the impact of organic nitrogen uptake on ecosystem carbon cycling. The new version of the model was evaluated for both boreal forest and tundra sites. We found that the modeled organic nitrogen uptake accounted for 36–87% of total nitrogen uptake by plants in tundra ecosystems and 26–50% for boreal forests, suggesting that tundra ecosystem might have more relied on the organic form of nitrogen than boreal forests. The simulated monthly gross ecosystem production (GPP) and net ecosystem production (NEP) tended to be larger with the new version of the model since the plant uptake of organic nitrogen alleviated the soil nitrogen limitation especially during the growing season. The sensitivity study indicated that the most important factors controlling the plant uptake of organic nitrogen was the soil amino acid diffusion coefficient ( D e ) in our model, suggesting that the organic nitrogen uptake by plants is likely to be regulated by the edaphic characteristics of diffusion. The model uncertainty due to uncertain parameters associated with organic nitrogen uptake of the tundra ecosystem was larger than the boreal forest ecosystems. This study suggests that considering the organic nitrogen uptake by plants is important to carbon modeling of boreal forest and tundra ecosystems. |
format |
Article in Journal/Newspaper |
author |
Q. Zhu Q. Zhuang |
author_facet |
Q. Zhu Q. Zhuang |
author_sort |
Q. Zhu |
title |
Modeling the effects of organic nitrogen uptake by plants on the carbon cycling of boreal forest and tundra ecosystems |
title_short |
Modeling the effects of organic nitrogen uptake by plants on the carbon cycling of boreal forest and tundra ecosystems |
title_full |
Modeling the effects of organic nitrogen uptake by plants on the carbon cycling of boreal forest and tundra ecosystems |
title_fullStr |
Modeling the effects of organic nitrogen uptake by plants on the carbon cycling of boreal forest and tundra ecosystems |
title_full_unstemmed |
Modeling the effects of organic nitrogen uptake by plants on the carbon cycling of boreal forest and tundra ecosystems |
title_sort |
modeling the effects of organic nitrogen uptake by plants on the carbon cycling of boreal forest and tundra ecosystems |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/bg-10-7943-2013 https://doaj.org/article/87baddeccd3e4cc38f31098acce96b98 |
genre |
Tundra |
genre_facet |
Tundra |
op_source |
Biogeosciences, Vol 10, Iss 12, Pp 7943-7955 (2013) |
op_relation |
http://www.biogeosciences.net/10/7943/2013/bg-10-7943-2013.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-10-7943-2013 https://doaj.org/article/87baddeccd3e4cc38f31098acce96b98 |
op_doi |
https://doi.org/10.5194/bg-10-7943-2013 |
container_title |
Biogeosciences |
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10 |
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12 |
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7943 |
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7955 |
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1766228579484434432 |