Snow and vegetation seasonality influence seasonal trends of leaf nitrogen and biomass in Arctic tundra
Abstract Climate change, including both increasing temperatures and changing snow regimes, is progressing rapidly in the Arctic, leading to changes in plant phenology and in the seasonal patterns of plant properties, such as tissue nitrogen (N) content and community aboveground biomass. However, sig...
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ftunivoulu:oai:oulu.fi:nbnfi-fe2023081596701 2023-09-05T13:16:30+02:00 Snow and vegetation seasonality influence seasonal trends of leaf nitrogen and biomass in Arctic tundra Kelsey, K. C. (Katharine C.) Pedersen, S. H. (Stine Højlund) Leffler, A. J. (A. Joshua) Sexton, J. O. (Joseph O.) Welker, J. M. (Jeffrey M.) 2023 application/pdf http://urn.fi/urn:nbn:fi-fe2023081596701 eng eng John Wiley & Sons info:eu-repo/semantics/openAccess © 2023 The Authors. Ecosphere published by Wiley Periodicals LLC on behalf of The Ecological Society of America. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. https://creativecommons.org/licenses/by/4.0/ Arctic NDVI biomass carbon functional group leaf nitrogen nitrogen phenology plant functional group snow phenology vegetation phenology info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2023 ftunivoulu 2023-08-16T22:59:23Z Abstract Climate change, including both increasing temperatures and changing snow regimes, is progressing rapidly in the Arctic, leading to changes in plant phenology and in the seasonal patterns of plant properties, such as tissue nitrogen (N) content and community aboveground biomass. However, significant knowledge gaps remain over how these seasonal patterns vary among Arctic plant functional groups (i.e., shrubs, grasses, and forbs) and across large geographical areas. We used three years of in situ field vegetation sampling from an 80,000-km² area in Arctic Alaska, remotely sensed vegetation data (daily normalized difference vegetation index [NDVI]), and modeled output of snow-free date to determine and model the seasonal trends and primary controls on leaf percent nitrogen and biomass (in grams per square meter) among Arctic vegetation functional groups. We determined relative vegetation phenology stage at a 500-m spatial scale resolution, defined as the number of days between the date of the seasonal maximum NDVI and the vegetation field sampling date, and relative snow phenology stage (90-m spatial scale) was determined as the number of days between the date of snow-free ground and the sampling date. Models including relative phenology stage were particularly important for explaining seasonal variability of %N in shrubs, graminoids, and forbs. Similarly, vegetation and snow phenology stages were also important for modeling seasonal biomass of shrubs and graminoids; however, for all functional groups, the models explained only a small amount of seasonal variability in biomass. Relative phenology stage was a stronger predictor of %N and biomass than geographic position, indicating that localized controls on phenology, acting at spatial scales of 500 m and smaller, are critical to understanding %N and biomass. Article in Journal/Newspaper Arctic Climate change Tundra Alaska Jultika - University of Oulu repository Arctic |
institution |
Open Polar |
collection |
Jultika - University of Oulu repository |
op_collection_id |
ftunivoulu |
language |
English |
topic |
Arctic NDVI biomass carbon functional group leaf nitrogen nitrogen phenology plant functional group snow phenology vegetation phenology |
spellingShingle |
Arctic NDVI biomass carbon functional group leaf nitrogen nitrogen phenology plant functional group snow phenology vegetation phenology Kelsey, K. C. (Katharine C.) Pedersen, S. H. (Stine Højlund) Leffler, A. J. (A. Joshua) Sexton, J. O. (Joseph O.) Welker, J. M. (Jeffrey M.) Snow and vegetation seasonality influence seasonal trends of leaf nitrogen and biomass in Arctic tundra |
topic_facet |
Arctic NDVI biomass carbon functional group leaf nitrogen nitrogen phenology plant functional group snow phenology vegetation phenology |
description |
Abstract Climate change, including both increasing temperatures and changing snow regimes, is progressing rapidly in the Arctic, leading to changes in plant phenology and in the seasonal patterns of plant properties, such as tissue nitrogen (N) content and community aboveground biomass. However, significant knowledge gaps remain over how these seasonal patterns vary among Arctic plant functional groups (i.e., shrubs, grasses, and forbs) and across large geographical areas. We used three years of in situ field vegetation sampling from an 80,000-km² area in Arctic Alaska, remotely sensed vegetation data (daily normalized difference vegetation index [NDVI]), and modeled output of snow-free date to determine and model the seasonal trends and primary controls on leaf percent nitrogen and biomass (in grams per square meter) among Arctic vegetation functional groups. We determined relative vegetation phenology stage at a 500-m spatial scale resolution, defined as the number of days between the date of the seasonal maximum NDVI and the vegetation field sampling date, and relative snow phenology stage (90-m spatial scale) was determined as the number of days between the date of snow-free ground and the sampling date. Models including relative phenology stage were particularly important for explaining seasonal variability of %N in shrubs, graminoids, and forbs. Similarly, vegetation and snow phenology stages were also important for modeling seasonal biomass of shrubs and graminoids; however, for all functional groups, the models explained only a small amount of seasonal variability in biomass. Relative phenology stage was a stronger predictor of %N and biomass than geographic position, indicating that localized controls on phenology, acting at spatial scales of 500 m and smaller, are critical to understanding %N and biomass. |
format |
Article in Journal/Newspaper |
author |
Kelsey, K. C. (Katharine C.) Pedersen, S. H. (Stine Højlund) Leffler, A. J. (A. Joshua) Sexton, J. O. (Joseph O.) Welker, J. M. (Jeffrey M.) |
author_facet |
Kelsey, K. C. (Katharine C.) Pedersen, S. H. (Stine Højlund) Leffler, A. J. (A. Joshua) Sexton, J. O. (Joseph O.) Welker, J. M. (Jeffrey M.) |
author_sort |
Kelsey, K. C. (Katharine C.) |
title |
Snow and vegetation seasonality influence seasonal trends of leaf nitrogen and biomass in Arctic tundra |
title_short |
Snow and vegetation seasonality influence seasonal trends of leaf nitrogen and biomass in Arctic tundra |
title_full |
Snow and vegetation seasonality influence seasonal trends of leaf nitrogen and biomass in Arctic tundra |
title_fullStr |
Snow and vegetation seasonality influence seasonal trends of leaf nitrogen and biomass in Arctic tundra |
title_full_unstemmed |
Snow and vegetation seasonality influence seasonal trends of leaf nitrogen and biomass in Arctic tundra |
title_sort |
snow and vegetation seasonality influence seasonal trends of leaf nitrogen and biomass in arctic tundra |
publisher |
John Wiley & Sons |
publishDate |
2023 |
url |
http://urn.fi/urn:nbn:fi-fe2023081596701 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change Tundra Alaska |
genre_facet |
Arctic Climate change Tundra Alaska |
op_rights |
info:eu-repo/semantics/openAccess © 2023 The Authors. Ecosphere published by Wiley Periodicals LLC on behalf of The Ecological Society of America. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. https://creativecommons.org/licenses/by/4.0/ |
_version_ |
1776198058164355072 |