Data from: Landscape variability of vegetation change across the forest to tundra transition of central Canada
Paper Abstract: Widespread increases in the productivity of tundra ecosystems and static trends – or even declines – in boreal ecosystems have been detected since the early 1980s using coarse-scale remote sensing. However, intermediate-scale Landsat studies have shown that these changes are heteroge...
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ftzenodo:oai:zenodo.org:12788412 2024-09-15T18:39:36+00:00 Data from: Landscape variability of vegetation change across the forest to tundra transition of central Canada Bonney, Mitchell 2024-07-20 https://doi.org/10.5281/zenodo.12788412 unknown Zenodo https://doi.org/10.5281/zenodo.12788411 https://doi.org/10.5281/zenodo.12788412 oai:zenodo.org:12788412 info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode Remote Sensing of Environment, 217, 18 - 29, (2024-07-20) info:eu-repo/semantics/other 2024 ftzenodo https://doi.org/10.5281/zenodo.1278841210.5281/zenodo.12788411 2024-07-26T21:34:10Z Paper Abstract: Widespread increases in the productivity of tundra ecosystems and static trends – or even declines – in boreal ecosystems have been detected since the early 1980s using coarse-scale remote sensing. However, intermediate-scale Landsat studies have shown that these changes are heterogeneous and may be related to landscape and regional variability in climate, land cover, topography and moisture availability. In this study, a Landsat Normalized Difference Vegetation Index (NDVI) time-series (1984–2016) was examined for an area spanning the transition from sub-Arctic boreal forest to Low Arctic tundra in central Canada. This was supplemented by analyses of relationships with a suite of environmental variables and in situ measurements of bulk vegetation volume. Results show that NDVI trends were generally positive (i.e. increasing) across the study area but were smallest in the forest zone and largest in the northern tundra zone. More than one-quarter (27%) of un-masked pixels exhibited a significant (p < 0.05) trend and virtually all (99.3%) of those pixels exhibited an increasing, or “greening”, trend. Greening pixels were most common in the northern tundra zone and the southern ecotone zone. Random Forest modeling of the relationship between NDVI and environmental variables indicated that the magnitude and direction of trends varied across the forest to tundra transition. Areas that experienced larger increases in NDVI include: (i) areas where summer temperatures increased; (ii) areas exhibiting predominantly shrub and forest cover; and (iii) locations closer to major drainage systems, further from major lakes, and at lower elevations. Ground validation in the central portion of the study area reveals a strong relationship (R 2 = 0.79) between vegetation volume and NDVI for non-tree functional groups and that alder ( Alnus crispa ) shrublands and open spruce ( Picea mariana and P. glauca ) woodland with shrubby understories were most likely to exhibit greening. These findings indicate that the ... Other/Unknown Material Tundra Zenodo |
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Paper Abstract: Widespread increases in the productivity of tundra ecosystems and static trends – or even declines – in boreal ecosystems have been detected since the early 1980s using coarse-scale remote sensing. However, intermediate-scale Landsat studies have shown that these changes are heterogeneous and may be related to landscape and regional variability in climate, land cover, topography and moisture availability. In this study, a Landsat Normalized Difference Vegetation Index (NDVI) time-series (1984–2016) was examined for an area spanning the transition from sub-Arctic boreal forest to Low Arctic tundra in central Canada. This was supplemented by analyses of relationships with a suite of environmental variables and in situ measurements of bulk vegetation volume. Results show that NDVI trends were generally positive (i.e. increasing) across the study area but were smallest in the forest zone and largest in the northern tundra zone. More than one-quarter (27%) of un-masked pixels exhibited a significant (p < 0.05) trend and virtually all (99.3%) of those pixels exhibited an increasing, or “greening”, trend. Greening pixels were most common in the northern tundra zone and the southern ecotone zone. Random Forest modeling of the relationship between NDVI and environmental variables indicated that the magnitude and direction of trends varied across the forest to tundra transition. Areas that experienced larger increases in NDVI include: (i) areas where summer temperatures increased; (ii) areas exhibiting predominantly shrub and forest cover; and (iii) locations closer to major drainage systems, further from major lakes, and at lower elevations. Ground validation in the central portion of the study area reveals a strong relationship (R 2 = 0.79) between vegetation volume and NDVI for non-tree functional groups and that alder ( Alnus crispa ) shrublands and open spruce ( Picea mariana and P. glauca ) woodland with shrubby understories were most likely to exhibit greening. These findings indicate that the ... |
format |
Other/Unknown Material |
author |
Bonney, Mitchell |
spellingShingle |
Bonney, Mitchell Data from: Landscape variability of vegetation change across the forest to tundra transition of central Canada |
author_facet |
Bonney, Mitchell |
author_sort |
Bonney, Mitchell |
title |
Data from: Landscape variability of vegetation change across the forest to tundra transition of central Canada |
title_short |
Data from: Landscape variability of vegetation change across the forest to tundra transition of central Canada |
title_full |
Data from: Landscape variability of vegetation change across the forest to tundra transition of central Canada |
title_fullStr |
Data from: Landscape variability of vegetation change across the forest to tundra transition of central Canada |
title_full_unstemmed |
Data from: Landscape variability of vegetation change across the forest to tundra transition of central Canada |
title_sort |
data from: landscape variability of vegetation change across the forest to tundra transition of central canada |
publisher |
Zenodo |
publishDate |
2024 |
url |
https://doi.org/10.5281/zenodo.12788412 |
genre |
Tundra |
genre_facet |
Tundra |
op_source |
Remote Sensing of Environment, 217, 18 - 29, (2024-07-20) |
op_relation |
https://doi.org/10.5281/zenodo.12788411 https://doi.org/10.5281/zenodo.12788412 oai:zenodo.org:12788412 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.5281/zenodo.1278841210.5281/zenodo.12788411 |
_version_ |
1810483967886884864 |