Growing season leaf carbon:nitrogen dynamics in Arctic tundra vegetation from ground and Sentinel-2 observations reveal reallocation timing and upscaling potential
Plant nitrogen (N) use is an essential component of the N cycle in Arctic terrestrial ecosystems, and important processes include plant N uptake and reallocation during the growing season. While the availability of N to deciduous tundra plants in part relies on their internal reallocation of N from...
Published in: | Remote Sensing of Environment |
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Language: | English |
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2021
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Online Access: | https://curis.ku.dk/portal/da/publications/growing-season-leaf-carbonnitrogen-dynamics-in-arctic-tundra-vegetation-from-ground-and-sentinel2-observations-reveal-reallocation-timing-and-upscaling-potential(47a751b0-c434-4f8e-820c-1997942f084a).html https://doi.org/10.1016/j.rse.2021.112512 https://curis.ku.dk/ws/files/273755643/Growing_season_leaf_carbonnitrogen_dynamics_in_Arctic_tundra_vegetation_from_ground_and_Sentinel_2_observations_reveal_reallocation_timing_and_upscaling_potential.pdf |
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ftcopenhagenunip:oai:pure.atira.dk:publications/47a751b0-c434-4f8e-820c-1997942f084a 2024-05-19T07:33:05+00:00 Growing season leaf carbon:nitrogen dynamics in Arctic tundra vegetation from ground and Sentinel-2 observations reveal reallocation timing and upscaling potential Westergaard-Nielsen, A. Christiansen, C. T. Elberling, B. 2021 application/pdf https://curis.ku.dk/portal/da/publications/growing-season-leaf-carbonnitrogen-dynamics-in-arctic-tundra-vegetation-from-ground-and-sentinel2-observations-reveal-reallocation-timing-and-upscaling-potential(47a751b0-c434-4f8e-820c-1997942f084a).html https://doi.org/10.1016/j.rse.2021.112512 https://curis.ku.dk/ws/files/273755643/Growing_season_leaf_carbonnitrogen_dynamics_in_Arctic_tundra_vegetation_from_ground_and_Sentinel_2_observations_reveal_reallocation_timing_and_upscaling_potential.pdf eng eng info:eu-repo/semantics/openAccess Westergaard-Nielsen , A , Christiansen , C T & Elberling , B 2021 , ' Growing season leaf carbon:nitrogen dynamics in Arctic tundra vegetation from ground and Sentinel-2 observations reveal reallocation timing and upscaling potential ' , Remote Sensing of Environment , vol. 262 , 112512 . https://doi.org/10.1016/j.rse.2021.112512 article 2021 ftcopenhagenunip https://doi.org/10.1016/j.rse.2021.112512 2024-05-02T00:33:13Z Plant nitrogen (N) use is an essential component of the N cycle in Arctic terrestrial ecosystems, and important processes include plant N uptake and reallocation during the growing season. While the availability of N to deciduous tundra plants in part relies on their internal reallocation of N from leaves to stems and roots during autumn senescence, the species-specific importance of reallocation timing and its community-wide implications on landscape- and regional-scales remains not well known. Here, we quantified leaf N contents and C:N ratios of four widespread shrub species in West Greenland from June through October and compared plot observations to landscape scale based on a new Sentinel-2-derived index. Our Sentinel-2 index captures overall N reallocation trends well across time and space at the plot level (R 2 = 0.81, p < 0.001). Using this novel approach is therefore relevant for upscaling of current and future changes in plant C:N dynamics. Using satellite data, we estimate the leaf N mass reallocated during senescence equaled about 0.8 g N m −2 from leaves to stems and roots. We conclude that (1) in-situ data from the entire growing season is critical to quantify timing and contrasting strategies of N allocation at species level, (2) key species such as Salix glauca are capable of halving their leaf N content during senescence, (3) Sentinel-2 (S-2) satellite data is a strong candidate for quantifying these plant functional dynamics in space and time. Our study has implications for research on competition among Arctic plants, litter decomposition and consequently carbon accumulation in tundra soils from a climate change perspective. Further, it captures plant functional dynamics during critical parts of the growing season, including autumn senescence which is generally more complex than capturing spring greenup. Lastly, our new index has important implications for remotely mapping temporal and spatial variation in substrate quality for both wild and domesticated herbivores, as it is a first step ... Article in Journal/Newspaper Arctic Arctic Climate change Greenland Tundra University of Copenhagen: Research Remote Sensing of Environment 262 112512 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
description |
Plant nitrogen (N) use is an essential component of the N cycle in Arctic terrestrial ecosystems, and important processes include plant N uptake and reallocation during the growing season. While the availability of N to deciduous tundra plants in part relies on their internal reallocation of N from leaves to stems and roots during autumn senescence, the species-specific importance of reallocation timing and its community-wide implications on landscape- and regional-scales remains not well known. Here, we quantified leaf N contents and C:N ratios of four widespread shrub species in West Greenland from June through October and compared plot observations to landscape scale based on a new Sentinel-2-derived index. Our Sentinel-2 index captures overall N reallocation trends well across time and space at the plot level (R 2 = 0.81, p < 0.001). Using this novel approach is therefore relevant for upscaling of current and future changes in plant C:N dynamics. Using satellite data, we estimate the leaf N mass reallocated during senescence equaled about 0.8 g N m −2 from leaves to stems and roots. We conclude that (1) in-situ data from the entire growing season is critical to quantify timing and contrasting strategies of N allocation at species level, (2) key species such as Salix glauca are capable of halving their leaf N content during senescence, (3) Sentinel-2 (S-2) satellite data is a strong candidate for quantifying these plant functional dynamics in space and time. Our study has implications for research on competition among Arctic plants, litter decomposition and consequently carbon accumulation in tundra soils from a climate change perspective. Further, it captures plant functional dynamics during critical parts of the growing season, including autumn senescence which is generally more complex than capturing spring greenup. Lastly, our new index has important implications for remotely mapping temporal and spatial variation in substrate quality for both wild and domesticated herbivores, as it is a first step ... |
format |
Article in Journal/Newspaper |
author |
Westergaard-Nielsen, A. Christiansen, C. T. Elberling, B. |
spellingShingle |
Westergaard-Nielsen, A. Christiansen, C. T. Elberling, B. Growing season leaf carbon:nitrogen dynamics in Arctic tundra vegetation from ground and Sentinel-2 observations reveal reallocation timing and upscaling potential |
author_facet |
Westergaard-Nielsen, A. Christiansen, C. T. Elberling, B. |
author_sort |
Westergaard-Nielsen, A. |
title |
Growing season leaf carbon:nitrogen dynamics in Arctic tundra vegetation from ground and Sentinel-2 observations reveal reallocation timing and upscaling potential |
title_short |
Growing season leaf carbon:nitrogen dynamics in Arctic tundra vegetation from ground and Sentinel-2 observations reveal reallocation timing and upscaling potential |
title_full |
Growing season leaf carbon:nitrogen dynamics in Arctic tundra vegetation from ground and Sentinel-2 observations reveal reallocation timing and upscaling potential |
title_fullStr |
Growing season leaf carbon:nitrogen dynamics in Arctic tundra vegetation from ground and Sentinel-2 observations reveal reallocation timing and upscaling potential |
title_full_unstemmed |
Growing season leaf carbon:nitrogen dynamics in Arctic tundra vegetation from ground and Sentinel-2 observations reveal reallocation timing and upscaling potential |
title_sort |
growing season leaf carbon:nitrogen dynamics in arctic tundra vegetation from ground and sentinel-2 observations reveal reallocation timing and upscaling potential |
publishDate |
2021 |
url |
https://curis.ku.dk/portal/da/publications/growing-season-leaf-carbonnitrogen-dynamics-in-arctic-tundra-vegetation-from-ground-and-sentinel2-observations-reveal-reallocation-timing-and-upscaling-potential(47a751b0-c434-4f8e-820c-1997942f084a).html https://doi.org/10.1016/j.rse.2021.112512 https://curis.ku.dk/ws/files/273755643/Growing_season_leaf_carbonnitrogen_dynamics_in_Arctic_tundra_vegetation_from_ground_and_Sentinel_2_observations_reveal_reallocation_timing_and_upscaling_potential.pdf |
genre |
Arctic Arctic Climate change Greenland Tundra |
genre_facet |
Arctic Arctic Climate change Greenland Tundra |
op_source |
Westergaard-Nielsen , A , Christiansen , C T & Elberling , B 2021 , ' Growing season leaf carbon:nitrogen dynamics in Arctic tundra vegetation from ground and Sentinel-2 observations reveal reallocation timing and upscaling potential ' , Remote Sensing of Environment , vol. 262 , 112512 . https://doi.org/10.1016/j.rse.2021.112512 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.rse.2021.112512 |
container_title |
Remote Sensing of Environment |
container_volume |
262 |
container_start_page |
112512 |
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1799471238457851904 |