Seasonal variability of leaf area index and foliar nitrogen in contrasting dry–mesic tundras
Assimilation and exchange of carbon for arctic ecosystems depend strongly on leaf area index (LAI) and total foliar nitrogen (TFN). For dry–mesic tundras, the seasonality of these characteristics is unexplored. We addressed this knowledge gap by measuring variations of LAI and TFN at five contrastin...
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Canadian Science Publishing
2009
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crcansciencepubl:10.1139/b09-016 2023-12-17T10:26:11+01:00 Seasonal variability of leaf area index and foliar nitrogen in contrasting dry–mesic tundras Campioli, Matteo Michelsen, Anders Samson, Roeland Lemeur, Raoul 2009 http://dx.doi.org/10.1139/b09-016 http://www.nrcresearchpress.com/doi/full-xml/10.1139/B09-016 http://www.nrcresearchpress.com/doi/pdf/10.1139/B09-016 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Botany volume 87, issue 5, page 431-442 ISSN 1916-2790 1916-2804 Plant Science Ecology Ecology, Evolution, Behavior and Systematics journal-article 2009 crcansciencepubl https://doi.org/10.1139/b09-016 2023-11-19T13:39:03Z Assimilation and exchange of carbon for arctic ecosystems depend strongly on leaf area index (LAI) and total foliar nitrogen (TFN). For dry–mesic tundras, the seasonality of these characteristics is unexplored. We addressed this knowledge gap by measuring variations of LAI and TFN at five contrasting subarctic heaths during the growing season 2007, from about 2 weeks after bud burst until about 2 weeks before senescence. The communities generally showed an early season LAI and TFN increase, owing to leaf development of deciduous shrubs, and limited variations later on, owing to concurrent leaf growth and mortality of evergreen shrubs. For most of the communities, the TFN:LAI ratio was constant along the entire sampling period, indicating that leaf growth and mortality, triggers for both LAI and TFN, are more important than leaf N retranslocation, which only affects TFN. A constant TFN:LAI ratio facilitates the determination of TFN from LAI, which is easier to measure or simulate. However, a sheltered community showed an increment in the LAI of the deciduous canopy in mid–late season, paralleled by a decreased TFN:LAI ratio. Article in Journal/Newspaper Arctic Subarctic Canadian Science Publishing (via Crossref) Arctic Botany 87 5 431 442 |
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Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
Plant Science Ecology Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Plant Science Ecology Ecology, Evolution, Behavior and Systematics Campioli, Matteo Michelsen, Anders Samson, Roeland Lemeur, Raoul Seasonal variability of leaf area index and foliar nitrogen in contrasting dry–mesic tundras |
topic_facet |
Plant Science Ecology Ecology, Evolution, Behavior and Systematics |
description |
Assimilation and exchange of carbon for arctic ecosystems depend strongly on leaf area index (LAI) and total foliar nitrogen (TFN). For dry–mesic tundras, the seasonality of these characteristics is unexplored. We addressed this knowledge gap by measuring variations of LAI and TFN at five contrasting subarctic heaths during the growing season 2007, from about 2 weeks after bud burst until about 2 weeks before senescence. The communities generally showed an early season LAI and TFN increase, owing to leaf development of deciduous shrubs, and limited variations later on, owing to concurrent leaf growth and mortality of evergreen shrubs. For most of the communities, the TFN:LAI ratio was constant along the entire sampling period, indicating that leaf growth and mortality, triggers for both LAI and TFN, are more important than leaf N retranslocation, which only affects TFN. A constant TFN:LAI ratio facilitates the determination of TFN from LAI, which is easier to measure or simulate. However, a sheltered community showed an increment in the LAI of the deciduous canopy in mid–late season, paralleled by a decreased TFN:LAI ratio. |
format |
Article in Journal/Newspaper |
author |
Campioli, Matteo Michelsen, Anders Samson, Roeland Lemeur, Raoul |
author_facet |
Campioli, Matteo Michelsen, Anders Samson, Roeland Lemeur, Raoul |
author_sort |
Campioli, Matteo |
title |
Seasonal variability of leaf area index and foliar nitrogen in contrasting dry–mesic tundras |
title_short |
Seasonal variability of leaf area index and foliar nitrogen in contrasting dry–mesic tundras |
title_full |
Seasonal variability of leaf area index and foliar nitrogen in contrasting dry–mesic tundras |
title_fullStr |
Seasonal variability of leaf area index and foliar nitrogen in contrasting dry–mesic tundras |
title_full_unstemmed |
Seasonal variability of leaf area index and foliar nitrogen in contrasting dry–mesic tundras |
title_sort |
seasonal variability of leaf area index and foliar nitrogen in contrasting dry–mesic tundras |
publisher |
Canadian Science Publishing |
publishDate |
2009 |
url |
http://dx.doi.org/10.1139/b09-016 http://www.nrcresearchpress.com/doi/full-xml/10.1139/B09-016 http://www.nrcresearchpress.com/doi/pdf/10.1139/B09-016 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Subarctic |
genre_facet |
Arctic Subarctic |
op_source |
Botany volume 87, issue 5, page 431-442 ISSN 1916-2790 1916-2804 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/b09-016 |
container_title |
Botany |
container_volume |
87 |
container_issue |
5 |
container_start_page |
431 |
op_container_end_page |
442 |
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1785577896636579840 |