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...
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ftdoajarticles:oai:doaj.org/article:214c06fd14f24be3b81e57adbd3f3911 2023-09-05T13:16:30+02:00 Spatial variation and seasonal dynamics of leaf-area index in the arctic tundra-implications for linking ground observations and satellite images Sari Juutinen Tarmo Virtanen Vladimir Kondratyev Tuomas Laurila Maiju Linkosalmi Juha Mikola Johanna Nyman Aleksi Räsänen Juha-Pekka Tuovinen Mika Aurela 2017-01-01T00:00:00Z https://doi.org/10.1088/1748-9326/aa7f85 https://doaj.org/article/214c06fd14f24be3b81e57adbd3f3911 EN eng IOP Publishing https://doi.org/10.1088/1748-9326/aa7f85 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/aa7f85 1748-9326 https://doaj.org/article/214c06fd14f24be3b81e57adbd3f3911 Environmental Research Letters, Vol 12, Iss 9, p 095002 (2017) arctic multispectral LAI VHSR vegetation Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 article 2017 ftdoajarticles https://doi.org/10.1088/1748-9326/aa7f85 2023-08-13T00:37:34Z 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 °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 ^2 _adj. 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. Article in Journal/Newspaper Arctic Tiksi Tundra Siberia Directory of Open Access Journals: DOAJ Articles Arctic Tiksi ENVELOPE(128.867,128.867,71.633,71.633) Environmental Research Letters 12 9 095002 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
arctic multispectral LAI VHSR vegetation Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
spellingShingle |
arctic multispectral LAI VHSR vegetation Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 Sari Juutinen Tarmo Virtanen Vladimir Kondratyev Tuomas Laurila Maiju Linkosalmi Juha Mikola Johanna Nyman Aleksi Räsänen Juha-Pekka Tuovinen Mika Aurela 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 Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
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 °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 ^2 _adj. 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. |
format |
Article in Journal/Newspaper |
author |
Sari Juutinen Tarmo Virtanen Vladimir Kondratyev Tuomas Laurila Maiju Linkosalmi Juha Mikola Johanna Nyman Aleksi Räsänen Juha-Pekka Tuovinen Mika Aurela |
author_facet |
Sari Juutinen Tarmo Virtanen Vladimir Kondratyev Tuomas Laurila Maiju Linkosalmi Juha Mikola Johanna Nyman Aleksi Räsänen Juha-Pekka Tuovinen Mika Aurela |
author_sort |
Sari Juutinen |
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 |
https://doi.org/10.1088/1748-9326/aa7f85 https://doaj.org/article/214c06fd14f24be3b81e57adbd3f3911 |
long_lat |
ENVELOPE(128.867,128.867,71.633,71.633) |
geographic |
Arctic Tiksi |
geographic_facet |
Arctic Tiksi |
genre |
Arctic Tiksi Tundra Siberia |
genre_facet |
Arctic Tiksi Tundra Siberia |
op_source |
Environmental Research Letters, Vol 12, Iss 9, p 095002 (2017) |
op_relation |
https://doi.org/10.1088/1748-9326/aa7f85 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/aa7f85 1748-9326 https://doaj.org/article/214c06fd14f24be3b81e57adbd3f3911 |
op_doi |
https://doi.org/10.1088/1748-9326/aa7f85 |
container_title |
Environmental Research Letters |
container_volume |
12 |
container_issue |
9 |
container_start_page |
095002 |
_version_ |
1776198055622606848 |