Interactions between carbon and nitrogen dynamics in estimating net primary productivity for potential vegetation in North America
We use the terrestrial ecosystem model (TEM), a process-based model, to investigate how interactions between carbon (C) and nitrogen (N) dynamics affect predictions of net primary productivity (NPP) for potential vegetation in North America. Data on pool sizes and fluxes of C and N from intensively...
Main Authors: | , , , , , , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
University of New Hampshire Scholars' Repository
1992
|
Subjects: | |
Online Access: | https://scholars.unh.edu/ersc/108 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1107&context=ersc |
id |
ftuninhampshire:oai:scholars.unh.edu:ersc-1107 |
---|---|
record_format |
openpolar |
spelling |
ftuninhampshire:oai:scholars.unh.edu:ersc-1107 2023-05-15T18:40:41+02:00 Interactions between carbon and nitrogen dynamics in estimating net primary productivity for potential vegetation in North America McGuire, A. David Melillo, Jerry M. Joyce, L. A. Kicklighter, David W. Schloss, Annette L. Moore, Berrien, III Vorosmarty, Charles J. 1992-06-01T07:00:00Z application/pdf https://scholars.unh.edu/ersc/108 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1107&context=ersc unknown University of New Hampshire Scholars' Repository https://scholars.unh.edu/ersc/108 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1107&context=ersc Copyright 1992 by the American Geophysical Union. Earth Systems Research Center text 1992 ftuninhampshire 2023-01-30T21:39:19Z We use the terrestrial ecosystem model (TEM), a process-based model, to investigate how interactions between carbon (C) and nitrogen (N) dynamics affect predictions of net primary productivity (NPP) for potential vegetation in North America. Data on pool sizes and fluxes of C and N from intensively studied field sites are used to calibrate the model for each of 17 non-wetland vegetation types. We use information on climate, soils, and vegetation to make estimates for each of 11,299 non-wetland, 0.5° latitude × 0.5° longitude, grid cells in North America. The potential annual NPP and net N mineralization (NETNMIN) of North America are estimated to be 7.032 × 1015 g C yr−1 and 104.6 × 1012 g N yr−1, respectively. Both NPP and NETNMIN increase along gradients of increasing temperature and moisture in northern and temperate regions of the continent, respectively. Nitrogen limitation of productivity is weak in tropical forests, increasingly stronger in temperate and boreal forests, and very strong in tundra ecosystems. The degree to which productivity is limited by the availability of N also varies within ecosystems. Thus spatial resolution in estimating exchanges of C between the atmosphere and the terrestrial biosphere is improved by modeling the linkage between C and N dynamics. We also perform a factorial experiment with TEM on temperate mixed forest in North America to evaluate the importance of considering interactions between C and N dynamics in the response of NPP to an elevated temperature of 2°C. With the C cycle uncoupled from the N cycle, NPP decreases primarily because of higher plant respiration. However, with the C and N cycles coupled, NPP increases because productivity that is due to increased N availability more than offsets the higher costs of plant respiration. Thus, to investigate how global change will affect biosphere-atmosphere interactions, process-based models need to consider linkages between the C and N cycles. Text Tundra University of New Hampshire: Scholars Repository |
institution |
Open Polar |
collection |
University of New Hampshire: Scholars Repository |
op_collection_id |
ftuninhampshire |
language |
unknown |
description |
We use the terrestrial ecosystem model (TEM), a process-based model, to investigate how interactions between carbon (C) and nitrogen (N) dynamics affect predictions of net primary productivity (NPP) for potential vegetation in North America. Data on pool sizes and fluxes of C and N from intensively studied field sites are used to calibrate the model for each of 17 non-wetland vegetation types. We use information on climate, soils, and vegetation to make estimates for each of 11,299 non-wetland, 0.5° latitude × 0.5° longitude, grid cells in North America. The potential annual NPP and net N mineralization (NETNMIN) of North America are estimated to be 7.032 × 1015 g C yr−1 and 104.6 × 1012 g N yr−1, respectively. Both NPP and NETNMIN increase along gradients of increasing temperature and moisture in northern and temperate regions of the continent, respectively. Nitrogen limitation of productivity is weak in tropical forests, increasingly stronger in temperate and boreal forests, and very strong in tundra ecosystems. The degree to which productivity is limited by the availability of N also varies within ecosystems. Thus spatial resolution in estimating exchanges of C between the atmosphere and the terrestrial biosphere is improved by modeling the linkage between C and N dynamics. We also perform a factorial experiment with TEM on temperate mixed forest in North America to evaluate the importance of considering interactions between C and N dynamics in the response of NPP to an elevated temperature of 2°C. With the C cycle uncoupled from the N cycle, NPP decreases primarily because of higher plant respiration. However, with the C and N cycles coupled, NPP increases because productivity that is due to increased N availability more than offsets the higher costs of plant respiration. Thus, to investigate how global change will affect biosphere-atmosphere interactions, process-based models need to consider linkages between the C and N cycles. |
format |
Text |
author |
McGuire, A. David Melillo, Jerry M. Joyce, L. A. Kicklighter, David W. Schloss, Annette L. Moore, Berrien, III Vorosmarty, Charles J. |
spellingShingle |
McGuire, A. David Melillo, Jerry M. Joyce, L. A. Kicklighter, David W. Schloss, Annette L. Moore, Berrien, III Vorosmarty, Charles J. Interactions between carbon and nitrogen dynamics in estimating net primary productivity for potential vegetation in North America |
author_facet |
McGuire, A. David Melillo, Jerry M. Joyce, L. A. Kicklighter, David W. Schloss, Annette L. Moore, Berrien, III Vorosmarty, Charles J. |
author_sort |
McGuire, A. David |
title |
Interactions between carbon and nitrogen dynamics in estimating net primary productivity for potential vegetation in North America |
title_short |
Interactions between carbon and nitrogen dynamics in estimating net primary productivity for potential vegetation in North America |
title_full |
Interactions between carbon and nitrogen dynamics in estimating net primary productivity for potential vegetation in North America |
title_fullStr |
Interactions between carbon and nitrogen dynamics in estimating net primary productivity for potential vegetation in North America |
title_full_unstemmed |
Interactions between carbon and nitrogen dynamics in estimating net primary productivity for potential vegetation in North America |
title_sort |
interactions between carbon and nitrogen dynamics in estimating net primary productivity for potential vegetation in north america |
publisher |
University of New Hampshire Scholars' Repository |
publishDate |
1992 |
url |
https://scholars.unh.edu/ersc/108 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1107&context=ersc |
genre |
Tundra |
genre_facet |
Tundra |
op_source |
Earth Systems Research Center |
op_relation |
https://scholars.unh.edu/ersc/108 https://scholars.unh.edu/cgi/viewcontent.cgi?article=1107&context=ersc |
op_rights |
Copyright 1992 by the American Geophysical Union. |
_version_ |
1766230086058508288 |