Short term changes in moisture content drive strong changes in Normalized Difference Vegetation Index and gross primary productivity in four Arctic moss communities
Climate change is currently altering temperature and precipitation totals and timing in Arctic regions. Moss communities constitute much of the understory in Arctic vegetation, and as poikilohydric plants moss are highly sensitive to timing and duration of moisture levels. Here we investigate the ro...
Published in: | Remote Sensing of Environment |
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Main Authors: | , , , |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Elsevier
2018
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Online Access: | http://hdl.handle.net/1893/27439 https://doi.org/10.1016/j.rse.2018.04.041 http://dspace.stir.ac.uk/bitstream/1893/27439/1/JL%20May%20et%20al%20Short-term.as%20accepted.pdf |
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ftunivstirling:oai:dspace.stir.ac.uk:1893/27439 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
University of Stirling: Stirling Digital Research Repository |
op_collection_id |
ftunivstirling |
language |
English |
topic |
Remote sensing NDVI Normalized difference vegetation index Climate change Arctic Moss community |
spellingShingle |
Remote sensing NDVI Normalized difference vegetation index Climate change Arctic Moss community May, Jeremy L Parker, Thomas Unger, Steven Oberbauer, Steven F Short term changes in moisture content drive strong changes in Normalized Difference Vegetation Index and gross primary productivity in four Arctic moss communities |
topic_facet |
Remote sensing NDVI Normalized difference vegetation index Climate change Arctic Moss community |
description |
Climate change is currently altering temperature and precipitation totals and timing in Arctic regions. Moss communities constitute much of the understory in Arctic vegetation, and as poikilohydric plants moss are highly sensitive to timing and duration of moisture levels. Here we investigate the role of moisture content on NDVI, red and near-infrared reflectance, and gross primary productivity (GPP) of two sphagnum and two pleurocarpus moss community types during two separate drying experiments. For both experiments, blocks of moss were collected near Imnavait Creek, Alaska, saturated to full water capacity, and then allowed to air dry before being re-saturated. Drying of blocks was conducted in a translucent outdoor tent during the first experiment and under indoor climate-controlled conditions during the second. Community NDVI (experiment 1 and 2), and GPP (experiment 2) were measured at regular intervals during the dry-down and after rewetting. In both experiments, moss NDVI sharply declined between 80% and 70% moisture content for sphagnum moss communities (NDVI change = −0.17 to −0.2), but less so for pleurocarpus moss communities (NDVI change = −0.06 to −0.12). Changes in NDVI were largely the result of increases in reflectance in red wavelengths. Peak GPP for all community types in the second experiment (1.31 to 2.08 μmol m−2 s−1) occurred at 80% moisture content and declined significantly as moisture content decreased. Rates of GPP continued to decline below 80% moisture content until near zero as moss reached a steady weight (air dry) over a period of 84 h, while NDVI values declined slowly between 70% hydration and fully air dry. Re-saturation caused NDVI to increase in both sphagnum (NDVI change = +0.18 to +0.23) and pleurocarpus (NDVI change = +0.10 to +0.17) communities. Only sphagnum communities showed GPP resuming (0.824 μmol m−2 s−1) after 24 h. The strong changes in NDVI and mismatch of moss NDVI values and GPP with moisture content fluctuations indicate that using NDVI as a proxy for ... |
author2 |
National Science Foundation Florida International University Biological and Environmental Sciences orcid:0000-0002-3648-5316 |
format |
Article in Journal/Newspaper |
author |
May, Jeremy L Parker, Thomas Unger, Steven Oberbauer, Steven F |
author_facet |
May, Jeremy L Parker, Thomas Unger, Steven Oberbauer, Steven F |
author_sort |
May, Jeremy L |
title |
Short term changes in moisture content drive strong changes in Normalized Difference Vegetation Index and gross primary productivity in four Arctic moss communities |
title_short |
Short term changes in moisture content drive strong changes in Normalized Difference Vegetation Index and gross primary productivity in four Arctic moss communities |
title_full |
Short term changes in moisture content drive strong changes in Normalized Difference Vegetation Index and gross primary productivity in four Arctic moss communities |
title_fullStr |
Short term changes in moisture content drive strong changes in Normalized Difference Vegetation Index and gross primary productivity in four Arctic moss communities |
title_full_unstemmed |
Short term changes in moisture content drive strong changes in Normalized Difference Vegetation Index and gross primary productivity in four Arctic moss communities |
title_sort |
short term changes in moisture content drive strong changes in normalized difference vegetation index and gross primary productivity in four arctic moss communities |
publisher |
Elsevier |
publishDate |
2018 |
url |
http://hdl.handle.net/1893/27439 https://doi.org/10.1016/j.rse.2018.04.041 http://dspace.stir.ac.uk/bitstream/1893/27439/1/JL%20May%20et%20al%20Short-term.as%20accepted.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic Climate change Alaska |
genre_facet |
Arctic Arctic Climate change Alaska |
op_relation |
May JL, Parker T, Unger S & Oberbauer SF (2018) Short term changes in moisture content drive strong changes in Normalized Difference Vegetation Index and gross primary productivity in four Arctic moss communities. Remote Sensing of Environment, 212, pp. 114-120. https://doi.org/10.1016/j.rse.2018.04.041 http://hdl.handle.net/1893/27439 doi:10.1016/j.rse.2018.04.041 WOS:000435053200010 2-s2.0-85046404287 913405 http://dspace.stir.ac.uk/bitstream/1893/27439/1/JL%20May%20et%20al%20Short-term.as%20accepted.pdf |
op_rights |
This item has been embargoed for a period. During the embargo please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study. Accepted refereed manuscript of: May JL, Parker T, Unger S & Oberbauer SF (2018) Short term changes in moisture content drive strong changes in Normalized Difference Vegetation Index and gross primary productivity in four Arctic moss communities, Remote Sensing of Environment, 212, pp. 114-120. DOI: https://doi.org/10.1016/j.rse.2018.04.041. © 2018, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ http://creativecommons.org/licenses/by-nc-nd/4.0/ [JL May et al Short-term.as accepted.pdf] Publisher requires embargo of 12 months after formal publication. |
op_doi |
https://doi.org/10.1016/j.rse.2018.04.041 |
container_title |
Remote Sensing of Environment |
container_volume |
212 |
container_start_page |
114 |
op_container_end_page |
120 |
_version_ |
1800743916803194880 |
spelling |
ftunivstirling:oai:dspace.stir.ac.uk:1893/27439 2024-06-02T07:59:51+00:00 Short term changes in moisture content drive strong changes in Normalized Difference Vegetation Index and gross primary productivity in four Arctic moss communities May, Jeremy L Parker, Thomas Unger, Steven Oberbauer, Steven F National Science Foundation Florida International University Biological and Environmental Sciences orcid:0000-0002-3648-5316 2018-06-30 application/pdf http://hdl.handle.net/1893/27439 https://doi.org/10.1016/j.rse.2018.04.041 http://dspace.stir.ac.uk/bitstream/1893/27439/1/JL%20May%20et%20al%20Short-term.as%20accepted.pdf en eng Elsevier May JL, Parker T, Unger S & Oberbauer SF (2018) Short term changes in moisture content drive strong changes in Normalized Difference Vegetation Index and gross primary productivity in four Arctic moss communities. Remote Sensing of Environment, 212, pp. 114-120. https://doi.org/10.1016/j.rse.2018.04.041 http://hdl.handle.net/1893/27439 doi:10.1016/j.rse.2018.04.041 WOS:000435053200010 2-s2.0-85046404287 913405 http://dspace.stir.ac.uk/bitstream/1893/27439/1/JL%20May%20et%20al%20Short-term.as%20accepted.pdf This item has been embargoed for a period. During the embargo please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study. Accepted refereed manuscript of: May JL, Parker T, Unger S & Oberbauer SF (2018) Short term changes in moisture content drive strong changes in Normalized Difference Vegetation Index and gross primary productivity in four Arctic moss communities, Remote Sensing of Environment, 212, pp. 114-120. DOI: https://doi.org/10.1016/j.rse.2018.04.041. © 2018, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ http://creativecommons.org/licenses/by-nc-nd/4.0/ [JL May et al Short-term.as accepted.pdf] Publisher requires embargo of 12 months after formal publication. Remote sensing NDVI Normalized difference vegetation index Climate change Arctic Moss community Journal Article AM - Accepted Manuscript 2018 ftunivstirling https://doi.org/10.1016/j.rse.2018.04.041 2024-05-07T04:30:11Z Climate change is currently altering temperature and precipitation totals and timing in Arctic regions. Moss communities constitute much of the understory in Arctic vegetation, and as poikilohydric plants moss are highly sensitive to timing and duration of moisture levels. Here we investigate the role of moisture content on NDVI, red and near-infrared reflectance, and gross primary productivity (GPP) of two sphagnum and two pleurocarpus moss community types during two separate drying experiments. For both experiments, blocks of moss were collected near Imnavait Creek, Alaska, saturated to full water capacity, and then allowed to air dry before being re-saturated. Drying of blocks was conducted in a translucent outdoor tent during the first experiment and under indoor climate-controlled conditions during the second. Community NDVI (experiment 1 and 2), and GPP (experiment 2) were measured at regular intervals during the dry-down and after rewetting. In both experiments, moss NDVI sharply declined between 80% and 70% moisture content for sphagnum moss communities (NDVI change = −0.17 to −0.2), but less so for pleurocarpus moss communities (NDVI change = −0.06 to −0.12). Changes in NDVI were largely the result of increases in reflectance in red wavelengths. Peak GPP for all community types in the second experiment (1.31 to 2.08 μmol m−2 s−1) occurred at 80% moisture content and declined significantly as moisture content decreased. Rates of GPP continued to decline below 80% moisture content until near zero as moss reached a steady weight (air dry) over a period of 84 h, while NDVI values declined slowly between 70% hydration and fully air dry. Re-saturation caused NDVI to increase in both sphagnum (NDVI change = +0.18 to +0.23) and pleurocarpus (NDVI change = +0.10 to +0.17) communities. Only sphagnum communities showed GPP resuming (0.824 μmol m−2 s−1) after 24 h. The strong changes in NDVI and mismatch of moss NDVI values and GPP with moisture content fluctuations indicate that using NDVI as a proxy for ... Article in Journal/Newspaper Arctic Arctic Climate change Alaska University of Stirling: Stirling Digital Research Repository Arctic Remote Sensing of Environment 212 114 120 |