Spatial variation and seasonal dynamics of leaf-area index in the arctic tundra-implications for linking ground observations and satellite images
Vegetation in the arctic tundra typically consists of a small-scale mosaic of plant communities, with species differing in growth forms, seasonality, and biogeochemical properties. Characterization of this variation is essential for understanding and modeling the functioning of the arctic tundra in...
Published in: | Environmental Research Letters |
---|---|
Main Authors: | , , , , , , , , , |
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
IOP Publishing
2017
|
Subjects: | |
Online Access: | http://hdl.handle.net/10138/220942 |
id |
ftunivhelsihelda:oai:helda.helsinki.fi:10138/220942 |
---|---|
record_format |
openpolar |
spelling |
ftunivhelsihelda:oai:helda.helsinki.fi:10138/220942 2024-01-07T09:40:46+01:00 Spatial variation and seasonal dynamics of leaf-area index in the arctic tundra-implications for linking ground observations and satellite images Juutinen, Sari Virtanen, Tarmo Kondratyev, Vladimir Laurila, Tuomas Linkosalmi, Maiju Mikola, Juha Nyman, Johanna Rasanen, Aleksi Tuovinen, Juha-Pekka Aurela, Mika Environmental Sciences Tarmo Virtanen / Principal Investigator Terrestrial Interactions Research Group Urban Environmental Policy Environmental Change Research Unit (ECRU) 2017-09-07T07:19:03Z 10 application/pdf http://hdl.handle.net/10138/220942 eng eng IOP Publishing 10.1088/1748-9326/aa7f85 We thank Emmi Vaha and Lauri Rosenius for field and laboratory assistance, and James Thompson for English revision. This research was supported by the Academy of Finland (projects 269095 and 291736 for MA and TV). We thank G Chumachenko and O Dmitrieva for kindly making arrangements for our stay at the Tiksi Observatory and Yakutian Service for Hydrometeorology and Environmental Monitoring for providing accommodation and access to the observatory. Juutinen , S , Virtanen , T , Kondratyev , V , Laurila , T , Linkosalmi , M , Mikola , J , Nyman , J , Rasanen , A , Tuovinen , J-P & Aurela , M 2017 , ' Spatial variation and seasonal dynamics of leaf-area index in the arctic tundra-implications for linking ground observations and satellite images ' , Environmental Research Letters , vol. 12 , no. 9 , 095002 . https://doi.org/10.1088/1748-9326/aa7f85 ORCID: /0000-0002-4336-2648/work/39203113 ORCID: /0000-0002-3629-1837/work/39203550 ORCID: /0000-0001-8660-2464/work/105284713 85030764299 7a3ce948-54e9-4df2-b3ad-a2172e9c805f http://hdl.handle.net/10138/220942 000408504700001 cc_by openAccess info:eu-repo/semantics/openAccess arctic multispectral LAI VHSR vegetation PLANT FUNCTIONAL TYPES SIBERIAN TUNDRA CO2 EXCHANGE ECOSYSTEMS RESOLUTION ALASKA COVER PHOTOSYNTHESIS COMMUNITIES 1181 Ecology evolutionary biology Article publishedVersion 2017 ftunivhelsihelda 2023-12-14T00:13:00Z Vegetation in the arctic tundra typically consists of a small-scale mosaic of plant communities, with species differing in growth forms, seasonality, and biogeochemical properties. Characterization of this variation is essential for understanding and modeling the functioning of the arctic tundra in global carbon cycling, as well as for evaluating the resolution requirements for remote sensing. Our objective was to quantify the seasonal development of the leaf-area index (LAI) and its variation among plant communities in the arctic tundra near Tiksi, coastal Siberia, consisting of graminoid, dwarf shrub, moss, and lichen vegetation. We measured the LAI in the field and used two very-high-spatial resolution multispectral satellite images (QuickBird and WorldView-2), acquired at different phenological stages, to predict landscape-scale patterns. We used the empirical relationships between the plant community-specific LAI and degree-day accumulation (0 degrees C threshold) and quantified the relationship between the LAI and satellite NDVI (normalized difference vegetation index). Due to the temporal difference between the field data and satellite images, the LAI was approximated for the imagery dates, using the empirical model. LAI explained variation in the NDVI values well (R-adj.(2) 0.42-0.92). Of the plant functional types, the graminoid LAI showed the largest seasonal amplitudes and was the main cause of the varying spatial patterns of the NDVI and the related LAI between the two images. Our results illustrate how the short growing season, rapid development of the LAI, yearly climatic variation, and timing of the satellite data should be accounted for in matching imagery and field verification data in the Arctic region. Peer reviewed Article in Journal/Newspaper Arctic Arctic Tiksi Tundra Alaska Siberia HELDA – University of Helsinki Open Repository Arctic Tiksi ENVELOPE(128.867,128.867,71.633,71.633) Environmental Research Letters 12 9 095002 |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
arctic multispectral LAI VHSR vegetation PLANT FUNCTIONAL TYPES SIBERIAN TUNDRA CO2 EXCHANGE ECOSYSTEMS RESOLUTION ALASKA COVER PHOTOSYNTHESIS COMMUNITIES 1181 Ecology evolutionary biology |
spellingShingle |
arctic multispectral LAI VHSR vegetation PLANT FUNCTIONAL TYPES SIBERIAN TUNDRA CO2 EXCHANGE ECOSYSTEMS RESOLUTION ALASKA COVER PHOTOSYNTHESIS COMMUNITIES 1181 Ecology evolutionary biology Juutinen, Sari Virtanen, Tarmo Kondratyev, Vladimir Laurila, Tuomas Linkosalmi, Maiju Mikola, Juha Nyman, Johanna Rasanen, Aleksi Tuovinen, Juha-Pekka Aurela, Mika Spatial variation and seasonal dynamics of leaf-area index in the arctic tundra-implications for linking ground observations and satellite images |
topic_facet |
arctic multispectral LAI VHSR vegetation PLANT FUNCTIONAL TYPES SIBERIAN TUNDRA CO2 EXCHANGE ECOSYSTEMS RESOLUTION ALASKA COVER PHOTOSYNTHESIS COMMUNITIES 1181 Ecology evolutionary biology |
description |
Vegetation in the arctic tundra typically consists of a small-scale mosaic of plant communities, with species differing in growth forms, seasonality, and biogeochemical properties. Characterization of this variation is essential for understanding and modeling the functioning of the arctic tundra in global carbon cycling, as well as for evaluating the resolution requirements for remote sensing. Our objective was to quantify the seasonal development of the leaf-area index (LAI) and its variation among plant communities in the arctic tundra near Tiksi, coastal Siberia, consisting of graminoid, dwarf shrub, moss, and lichen vegetation. We measured the LAI in the field and used two very-high-spatial resolution multispectral satellite images (QuickBird and WorldView-2), acquired at different phenological stages, to predict landscape-scale patterns. We used the empirical relationships between the plant community-specific LAI and degree-day accumulation (0 degrees C threshold) and quantified the relationship between the LAI and satellite NDVI (normalized difference vegetation index). Due to the temporal difference between the field data and satellite images, the LAI was approximated for the imagery dates, using the empirical model. LAI explained variation in the NDVI values well (R-adj.(2) 0.42-0.92). Of the plant functional types, the graminoid LAI showed the largest seasonal amplitudes and was the main cause of the varying spatial patterns of the NDVI and the related LAI between the two images. Our results illustrate how the short growing season, rapid development of the LAI, yearly climatic variation, and timing of the satellite data should be accounted for in matching imagery and field verification data in the Arctic region. Peer reviewed |
author2 |
Environmental Sciences Tarmo Virtanen / Principal Investigator Terrestrial Interactions Research Group Urban Environmental Policy Environmental Change Research Unit (ECRU) |
format |
Article in Journal/Newspaper |
author |
Juutinen, Sari Virtanen, Tarmo Kondratyev, Vladimir Laurila, Tuomas Linkosalmi, Maiju Mikola, Juha Nyman, Johanna Rasanen, Aleksi Tuovinen, Juha-Pekka Aurela, Mika |
author_facet |
Juutinen, Sari Virtanen, Tarmo Kondratyev, Vladimir Laurila, Tuomas Linkosalmi, Maiju Mikola, Juha Nyman, Johanna Rasanen, Aleksi Tuovinen, Juha-Pekka Aurela, Mika |
author_sort |
Juutinen, Sari |
title |
Spatial variation and seasonal dynamics of leaf-area index in the arctic tundra-implications for linking ground observations and satellite images |
title_short |
Spatial variation and seasonal dynamics of leaf-area index in the arctic tundra-implications for linking ground observations and satellite images |
title_full |
Spatial variation and seasonal dynamics of leaf-area index in the arctic tundra-implications for linking ground observations and satellite images |
title_fullStr |
Spatial variation and seasonal dynamics of leaf-area index in the arctic tundra-implications for linking ground observations and satellite images |
title_full_unstemmed |
Spatial variation and seasonal dynamics of leaf-area index in the arctic tundra-implications for linking ground observations and satellite images |
title_sort |
spatial variation and seasonal dynamics of leaf-area index in the arctic tundra-implications for linking ground observations and satellite images |
publisher |
IOP Publishing |
publishDate |
2017 |
url |
http://hdl.handle.net/10138/220942 |
long_lat |
ENVELOPE(128.867,128.867,71.633,71.633) |
geographic |
Arctic Tiksi |
geographic_facet |
Arctic Tiksi |
genre |
Arctic Arctic Tiksi Tundra Alaska Siberia |
genre_facet |
Arctic Arctic Tiksi Tundra Alaska Siberia |
op_relation |
10.1088/1748-9326/aa7f85 We thank Emmi Vaha and Lauri Rosenius for field and laboratory assistance, and James Thompson for English revision. This research was supported by the Academy of Finland (projects 269095 and 291736 for MA and TV). We thank G Chumachenko and O Dmitrieva for kindly making arrangements for our stay at the Tiksi Observatory and Yakutian Service for Hydrometeorology and Environmental Monitoring for providing accommodation and access to the observatory. Juutinen , S , Virtanen , T , Kondratyev , V , Laurila , T , Linkosalmi , M , Mikola , J , Nyman , J , Rasanen , A , Tuovinen , J-P & Aurela , M 2017 , ' Spatial variation and seasonal dynamics of leaf-area index in the arctic tundra-implications for linking ground observations and satellite images ' , Environmental Research Letters , vol. 12 , no. 9 , 095002 . https://doi.org/10.1088/1748-9326/aa7f85 ORCID: /0000-0002-4336-2648/work/39203113 ORCID: /0000-0002-3629-1837/work/39203550 ORCID: /0000-0001-8660-2464/work/105284713 85030764299 7a3ce948-54e9-4df2-b3ad-a2172e9c805f http://hdl.handle.net/10138/220942 000408504700001 |
op_rights |
cc_by openAccess info:eu-repo/semantics/openAccess |
container_title |
Environmental Research Letters |
container_volume |
12 |
container_issue |
9 |
container_start_page |
095002 |
_version_ |
1787421567584567296 |