Burn severity influences postfire CO2 exchange in Arctic tundra
Author Posting. © Ecological Society of America, 2011. This article is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecological Applications 21 (2011): 477–489, doi:10.1890/10-0255.1. Burned landscapes pre...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/4703 2023-05-15T15:15:47+02:00 Burn severity influences postfire CO2 exchange in Arctic tundra Rocha, Adrian V. Shaver, Gaius R. 2011-03 application/pdf https://hdl.handle.net/1912/4703 en_US eng Ecological Society of America https://doi.org/10.1890/10-0255.1 Ecological Applications 21 (2011): 477–489 https://hdl.handle.net/1912/4703 doi:10.1890/10-0255.1 Ecological Applications 21 (2011): 477–489 doi:10.1890/10-0255.1 Anaktuvuk River fire Alaska USA Burn severity EVI2 (MODIS two-band enhanced vegetation index) NBR (normalized burn ratio) NEE (net ecosystem exchange of CO2) Tundra Upscaling Article 2011 ftwhoas https://doi.org/10.1890/10-0255.1 2022-05-28T22:58:25Z Author Posting. © Ecological Society of America, 2011. This article is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecological Applications 21 (2011): 477–489, doi:10.1890/10-0255.1. Burned landscapes present several challenges to quantifying landscape carbon balance. Fire scars are composed of a mosaic of patches that differ in burn severity, which may influence postfire carbon budgets through damage to vegetation and carbon stocks. We deployed three eddy covariance towers along a burn severity gradient (i.e., severely burned, moderately burned, and unburned tundra) to monitor postfire net ecosystem exchange of CO2 (NEE) within the large 2007 Anaktuvuk River fire scar in Alaska, USA, during the summer of 2008. Remote sensing data from the MODerate resolution Imaging Spectroradiometer (MODIS) was used to assess the spatial representativeness of the tower sites and parameterize a NEE model that was used to scale tower measurements to the landscape. The tower sites had similar vegetation and reflectance properties prior to the Anaktuvuk River fire and represented the range of surface conditions observed within the fire scar during the 2008 summer. Burn severity influenced a variety of surface properties, including residual organic matter, plant mortality, and vegetation recovery, which in turn determined postfire NEE. Carbon sequestration decreased with increased burn severity and was largely controlled by decreases in canopy photosynthesis. The MODIS two-band enhanced vegetation index (EVI2) monitored the seasonal course of surface greenness and explained 86% of the variability in NEE across the burn severity gradient. We demonstrate that understanding the relationship between burn severity, surface reflectance, and NEE is critical for estimating the overall postfire carbon balance of the Anaktuvuk River fire scar. This work was supported by NSF grants #0632139 (OPP-AON), #0808789 (OPP-ARCSS SGER), #0829285 ... Article in Journal/Newspaper Arctic Tundra Alaska Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Arctic Ecological Applications 21 2 477 489 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Anaktuvuk River fire Alaska USA Burn severity EVI2 (MODIS two-band enhanced vegetation index) NBR (normalized burn ratio) NEE (net ecosystem exchange of CO2) Tundra Upscaling |
spellingShingle |
Anaktuvuk River fire Alaska USA Burn severity EVI2 (MODIS two-band enhanced vegetation index) NBR (normalized burn ratio) NEE (net ecosystem exchange of CO2) Tundra Upscaling Rocha, Adrian V. Shaver, Gaius R. Burn severity influences postfire CO2 exchange in Arctic tundra |
topic_facet |
Anaktuvuk River fire Alaska USA Burn severity EVI2 (MODIS two-band enhanced vegetation index) NBR (normalized burn ratio) NEE (net ecosystem exchange of CO2) Tundra Upscaling |
description |
Author Posting. © Ecological Society of America, 2011. This article is posted here by permission of Ecological Society of America for personal use, not for redistribution. The definitive version was published in Ecological Applications 21 (2011): 477–489, doi:10.1890/10-0255.1. Burned landscapes present several challenges to quantifying landscape carbon balance. Fire scars are composed of a mosaic of patches that differ in burn severity, which may influence postfire carbon budgets through damage to vegetation and carbon stocks. We deployed three eddy covariance towers along a burn severity gradient (i.e., severely burned, moderately burned, and unburned tundra) to monitor postfire net ecosystem exchange of CO2 (NEE) within the large 2007 Anaktuvuk River fire scar in Alaska, USA, during the summer of 2008. Remote sensing data from the MODerate resolution Imaging Spectroradiometer (MODIS) was used to assess the spatial representativeness of the tower sites and parameterize a NEE model that was used to scale tower measurements to the landscape. The tower sites had similar vegetation and reflectance properties prior to the Anaktuvuk River fire and represented the range of surface conditions observed within the fire scar during the 2008 summer. Burn severity influenced a variety of surface properties, including residual organic matter, plant mortality, and vegetation recovery, which in turn determined postfire NEE. Carbon sequestration decreased with increased burn severity and was largely controlled by decreases in canopy photosynthesis. The MODIS two-band enhanced vegetation index (EVI2) monitored the seasonal course of surface greenness and explained 86% of the variability in NEE across the burn severity gradient. We demonstrate that understanding the relationship between burn severity, surface reflectance, and NEE is critical for estimating the overall postfire carbon balance of the Anaktuvuk River fire scar. This work was supported by NSF grants #0632139 (OPP-AON), #0808789 (OPP-ARCSS SGER), #0829285 ... |
format |
Article in Journal/Newspaper |
author |
Rocha, Adrian V. Shaver, Gaius R. |
author_facet |
Rocha, Adrian V. Shaver, Gaius R. |
author_sort |
Rocha, Adrian V. |
title |
Burn severity influences postfire CO2 exchange in Arctic tundra |
title_short |
Burn severity influences postfire CO2 exchange in Arctic tundra |
title_full |
Burn severity influences postfire CO2 exchange in Arctic tundra |
title_fullStr |
Burn severity influences postfire CO2 exchange in Arctic tundra |
title_full_unstemmed |
Burn severity influences postfire CO2 exchange in Arctic tundra |
title_sort |
burn severity influences postfire co2 exchange in arctic tundra |
publisher |
Ecological Society of America |
publishDate |
2011 |
url |
https://hdl.handle.net/1912/4703 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Tundra Alaska |
genre_facet |
Arctic Tundra Alaska |
op_source |
Ecological Applications 21 (2011): 477–489 doi:10.1890/10-0255.1 |
op_relation |
https://doi.org/10.1890/10-0255.1 Ecological Applications 21 (2011): 477–489 https://hdl.handle.net/1912/4703 doi:10.1890/10-0255.1 |
op_doi |
https://doi.org/10.1890/10-0255.1 |
container_title |
Ecological Applications |
container_volume |
21 |
container_issue |
2 |
container_start_page |
477 |
op_container_end_page |
489 |
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1766346129791778816 |