Upscaling field-measured seasonal ground vegetation patterns with Sentinel-2 images in boreal ecosystems
Aboveground biomass (AGB) and leaf area index (LAI) are key variables of ecosystem processes and functioning. Knowledge is lacking on how well the seasonal patterns of ground vegetation AGB and LAI can be detected by satellite images in boreal ecosystems. We conducted field measurements between May...
Published in: | International Journal of Remote Sensing |
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/563984 2024-01-07T09:45:28+01:00 Upscaling field-measured seasonal ground vegetation patterns with Sentinel-2 images in boreal ecosystems Pang, Yuwen Räsänen, Aleksi Juselius, Teemu Aurela, Mika Juutinen, Sari Väliranta, Minna Virtanen, Tarmo Ecosystems and Environment Research Programme Environmental Change Research Unit (ECRU) Helsinki Institute of Sustainability Science (HELSUS) Tarmo Virtanen / Principal Investigator 2023-08-15T03:35:04Z 23 application/pdf http://hdl.handle.net/10138/563984 eng eng Taylor & Francis 10.1080/01431161.2023.2234093 Pang , Y , Räsänen , A , Juselius , T , Aurela , M , Juutinen , S , Väliranta , M & Virtanen , T 2023 , ' Upscaling field-measured seasonal ground vegetation patterns with Sentinel-2 images in boreal ecosystems ' , International Journal of Remote Sensing , vol. 44 , no. 14 , pp. 4239-4261 . https://doi.org/10.1080/01431161.2023.2234093 ORCID: /0000-0003-0129-7240/work/140759858 ORCID: /0000-0001-8660-2464/work/140759913 ORCID: /0000-0002-0478-1225/work/140766632 1233613c-f1e7-4d26-b38e-8da57782b6c1 http://hdl.handle.net/10138/563984 001030321800001 cc_by openAccess info:eu-repo/semantics/openAccess 11831 Plant biology 222 Other engineering and technologies Article publishedVersion 2023 ftunivhelsihelda 2023-12-14T00:13:17Z Aboveground biomass (AGB) and leaf area index (LAI) are key variables of ecosystem processes and functioning. Knowledge is lacking on how well the seasonal patterns of ground vegetation AGB and LAI can be detected by satellite images in boreal ecosystems. We conducted field measurements between May and September during one growing season to investigate the seasonal development of ground vegetation AGB and LAI of seven plant functional types (PFTs) across seven vegetation types (VTs) within three peatland and forest study areas in northern Finland. We upscaled field-measured AGB and LAI with Sentinel-2 (S2) imagery by applying random forest (RF) regressions. Field-measured AGB peaked around the first week of August and, in most cases, one to two weeks later than LAI. Regarding PFTs, deciduous vascular plants had clear unimodal seasonal patterns, while the AGB and LAI of evergreen vegetation and mosses remained steady over the season. Remote sensing regression models explained 24.2–50.2% of the AGB (RMSE: 78.8–198.7 g m−2) and 48.5–56.1% of the LAI (RMSE: 0.207–0.497 m2 m−2) across sites. Peatland-dominant sites and VTs had a higher prediction accuracy. S2-predicted peak dates of AGB and LAI were one to three weeks earlier than the field-based ones. Our findings suggest that boreal ground vegetation seasonality varies among PFTs and VTs and that S2 time series data can be applied to monitor its spatiotemporal patterns, especially in treeless regions. Peer reviewed Article in Journal/Newspaper Northern Finland HELDA – University of Helsinki Open Repository International Journal of Remote Sensing 44 14 4239 4261 |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
11831 Plant biology 222 Other engineering and technologies |
spellingShingle |
11831 Plant biology 222 Other engineering and technologies Pang, Yuwen Räsänen, Aleksi Juselius, Teemu Aurela, Mika Juutinen, Sari Väliranta, Minna Virtanen, Tarmo Upscaling field-measured seasonal ground vegetation patterns with Sentinel-2 images in boreal ecosystems |
topic_facet |
11831 Plant biology 222 Other engineering and technologies |
description |
Aboveground biomass (AGB) and leaf area index (LAI) are key variables of ecosystem processes and functioning. Knowledge is lacking on how well the seasonal patterns of ground vegetation AGB and LAI can be detected by satellite images in boreal ecosystems. We conducted field measurements between May and September during one growing season to investigate the seasonal development of ground vegetation AGB and LAI of seven plant functional types (PFTs) across seven vegetation types (VTs) within three peatland and forest study areas in northern Finland. We upscaled field-measured AGB and LAI with Sentinel-2 (S2) imagery by applying random forest (RF) regressions. Field-measured AGB peaked around the first week of August and, in most cases, one to two weeks later than LAI. Regarding PFTs, deciduous vascular plants had clear unimodal seasonal patterns, while the AGB and LAI of evergreen vegetation and mosses remained steady over the season. Remote sensing regression models explained 24.2–50.2% of the AGB (RMSE: 78.8–198.7 g m−2) and 48.5–56.1% of the LAI (RMSE: 0.207–0.497 m2 m−2) across sites. Peatland-dominant sites and VTs had a higher prediction accuracy. S2-predicted peak dates of AGB and LAI were one to three weeks earlier than the field-based ones. Our findings suggest that boreal ground vegetation seasonality varies among PFTs and VTs and that S2 time series data can be applied to monitor its spatiotemporal patterns, especially in treeless regions. Peer reviewed |
author2 |
Ecosystems and Environment Research Programme Environmental Change Research Unit (ECRU) Helsinki Institute of Sustainability Science (HELSUS) Tarmo Virtanen / Principal Investigator |
format |
Article in Journal/Newspaper |
author |
Pang, Yuwen Räsänen, Aleksi Juselius, Teemu Aurela, Mika Juutinen, Sari Väliranta, Minna Virtanen, Tarmo |
author_facet |
Pang, Yuwen Räsänen, Aleksi Juselius, Teemu Aurela, Mika Juutinen, Sari Väliranta, Minna Virtanen, Tarmo |
author_sort |
Pang, Yuwen |
title |
Upscaling field-measured seasonal ground vegetation patterns with Sentinel-2 images in boreal ecosystems |
title_short |
Upscaling field-measured seasonal ground vegetation patterns with Sentinel-2 images in boreal ecosystems |
title_full |
Upscaling field-measured seasonal ground vegetation patterns with Sentinel-2 images in boreal ecosystems |
title_fullStr |
Upscaling field-measured seasonal ground vegetation patterns with Sentinel-2 images in boreal ecosystems |
title_full_unstemmed |
Upscaling field-measured seasonal ground vegetation patterns with Sentinel-2 images in boreal ecosystems |
title_sort |
upscaling field-measured seasonal ground vegetation patterns with sentinel-2 images in boreal ecosystems |
publisher |
Taylor & Francis |
publishDate |
2023 |
url |
http://hdl.handle.net/10138/563984 |
genre |
Northern Finland |
genre_facet |
Northern Finland |
op_relation |
10.1080/01431161.2023.2234093 Pang , Y , Räsänen , A , Juselius , T , Aurela , M , Juutinen , S , Väliranta , M & Virtanen , T 2023 , ' Upscaling field-measured seasonal ground vegetation patterns with Sentinel-2 images in boreal ecosystems ' , International Journal of Remote Sensing , vol. 44 , no. 14 , pp. 4239-4261 . https://doi.org/10.1080/01431161.2023.2234093 ORCID: /0000-0003-0129-7240/work/140759858 ORCID: /0000-0001-8660-2464/work/140759913 ORCID: /0000-0002-0478-1225/work/140766632 1233613c-f1e7-4d26-b38e-8da57782b6c1 http://hdl.handle.net/10138/563984 001030321800001 |
op_rights |
cc_by openAccess info:eu-repo/semantics/openAccess |
container_title |
International Journal of Remote Sensing |
container_volume |
44 |
container_issue |
14 |
container_start_page |
4239 |
op_container_end_page |
4261 |
_version_ |
1787427007005458432 |