Satellite‐based evidence for shrub and graminoid tundra expansion in northern Quebec from 1986 to 2010
Abstract Global vegetation models predict rapid poleward migration of tundra and boreal forest vegetation in response to climate warming. Local plot and air‐photo studies have documented recent changes in high‐latitude vegetation composition and structure, consistent with warming trends. To bridge t...
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crwiley:10.1111/j.1365-2486.2012.02708.x 2024-06-23T07:57:16+00:00 Satellite‐based evidence for shrub and graminoid tundra expansion in northern Quebec from 1986 to 2010 McManus, kelly M. Morton, Douglas C. Masek, Jeffrey G. Wang, Dongdong Sexton, Joseph O. Nagol, Jyoteshwar R. Ropars, Pascale Boudreau, Stéphane 2012 http://dx.doi.org/10.1111/j.1365-2486.2012.02708.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2486.2012.02708.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2486.2012.02708.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Global Change Biology volume 18, issue 7, page 2313-2323 ISSN 1354-1013 1365-2486 journal-article 2012 crwiley https://doi.org/10.1111/j.1365-2486.2012.02708.x 2024-06-06T04:23:24Z Abstract Global vegetation models predict rapid poleward migration of tundra and boreal forest vegetation in response to climate warming. Local plot and air‐photo studies have documented recent changes in high‐latitude vegetation composition and structure, consistent with warming trends. To bridge these two scales of inference, we analyzed a 24‐year (1986–2010) L andsat time series in a latitudinal transect across the boreal forest‐tundra biome boundary in northern Q uebec province, C anada. This region has experienced rapid warming during both winter and summer months during the last 40 years. Using a per‐pixel (30 m) trend analysis, 30% of the observable (cloud‐free) land area experienced a significant ( P < 0.05) positive trend in the N ormalized D ifference V egetation I ndex ( NDVI ). However, greening trends were not evenly split among cover types. Low shrub and graminoid tundra contributed preferentially to the greening trend, while forested areas were less likely to show significant trends in NDVI . These trends reflect increasing leaf area, rather than an increase in growing season length, because L andsat data were restricted to peak‐summer conditions. The average NDVI trend (0.007 yr −1 ) corresponds to a leaf‐area index ( LAI ) increase of ~0.6 based on the regional relationship between LAI and NDVI from the M oderate R esolution S pectroradiometer. Across the entire transect, the area‐averaged LAI increase was ~0.2 during 1986–2010. A higher area‐averaged LAI change (~0.3) within the shrub‐tundra portion of the transect represents a 20–60% relative increase in LAI during the last two decades. Our L andsat‐based analysis subdivides the overall high‐latitude greening trend into changes in peak‐summer greenness by cover type. Different responses within and among shrub, graminoid, and tree‐dominated cover types in this study indicate important fine‐scale heterogeneity in vegetation growth. Although our findings are consistent with community shifts in low‐biomass vegetation types over multi‐decadal ... Article in Journal/Newspaper Tundra Wiley Online Library Global Change Biology 18 7 2313 2323 |
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Wiley Online Library |
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crwiley |
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English |
description |
Abstract Global vegetation models predict rapid poleward migration of tundra and boreal forest vegetation in response to climate warming. Local plot and air‐photo studies have documented recent changes in high‐latitude vegetation composition and structure, consistent with warming trends. To bridge these two scales of inference, we analyzed a 24‐year (1986–2010) L andsat time series in a latitudinal transect across the boreal forest‐tundra biome boundary in northern Q uebec province, C anada. This region has experienced rapid warming during both winter and summer months during the last 40 years. Using a per‐pixel (30 m) trend analysis, 30% of the observable (cloud‐free) land area experienced a significant ( P < 0.05) positive trend in the N ormalized D ifference V egetation I ndex ( NDVI ). However, greening trends were not evenly split among cover types. Low shrub and graminoid tundra contributed preferentially to the greening trend, while forested areas were less likely to show significant trends in NDVI . These trends reflect increasing leaf area, rather than an increase in growing season length, because L andsat data were restricted to peak‐summer conditions. The average NDVI trend (0.007 yr −1 ) corresponds to a leaf‐area index ( LAI ) increase of ~0.6 based on the regional relationship between LAI and NDVI from the M oderate R esolution S pectroradiometer. Across the entire transect, the area‐averaged LAI increase was ~0.2 during 1986–2010. A higher area‐averaged LAI change (~0.3) within the shrub‐tundra portion of the transect represents a 20–60% relative increase in LAI during the last two decades. Our L andsat‐based analysis subdivides the overall high‐latitude greening trend into changes in peak‐summer greenness by cover type. Different responses within and among shrub, graminoid, and tree‐dominated cover types in this study indicate important fine‐scale heterogeneity in vegetation growth. Although our findings are consistent with community shifts in low‐biomass vegetation types over multi‐decadal ... |
format |
Article in Journal/Newspaper |
author |
McManus, kelly M. Morton, Douglas C. Masek, Jeffrey G. Wang, Dongdong Sexton, Joseph O. Nagol, Jyoteshwar R. Ropars, Pascale Boudreau, Stéphane |
spellingShingle |
McManus, kelly M. Morton, Douglas C. Masek, Jeffrey G. Wang, Dongdong Sexton, Joseph O. Nagol, Jyoteshwar R. Ropars, Pascale Boudreau, Stéphane Satellite‐based evidence for shrub and graminoid tundra expansion in northern Quebec from 1986 to 2010 |
author_facet |
McManus, kelly M. Morton, Douglas C. Masek, Jeffrey G. Wang, Dongdong Sexton, Joseph O. Nagol, Jyoteshwar R. Ropars, Pascale Boudreau, Stéphane |
author_sort |
McManus, kelly M. |
title |
Satellite‐based evidence for shrub and graminoid tundra expansion in northern Quebec from 1986 to 2010 |
title_short |
Satellite‐based evidence for shrub and graminoid tundra expansion in northern Quebec from 1986 to 2010 |
title_full |
Satellite‐based evidence for shrub and graminoid tundra expansion in northern Quebec from 1986 to 2010 |
title_fullStr |
Satellite‐based evidence for shrub and graminoid tundra expansion in northern Quebec from 1986 to 2010 |
title_full_unstemmed |
Satellite‐based evidence for shrub and graminoid tundra expansion in northern Quebec from 1986 to 2010 |
title_sort |
satellite‐based evidence for shrub and graminoid tundra expansion in northern quebec from 1986 to 2010 |
publisher |
Wiley |
publishDate |
2012 |
url |
http://dx.doi.org/10.1111/j.1365-2486.2012.02708.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2486.2012.02708.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2486.2012.02708.x |
genre |
Tundra |
genre_facet |
Tundra |
op_source |
Global Change Biology volume 18, issue 7, page 2313-2323 ISSN 1354-1013 1365-2486 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1365-2486.2012.02708.x |
container_title |
Global Change Biology |
container_volume |
18 |
container_issue |
7 |
container_start_page |
2313 |
op_container_end_page |
2323 |
_version_ |
1802650828711919616 |