Environmental and vegetation drivers of seasonal CO2 fluxes in a sub-arctic forest–mire ecotone
Unravelling the role of structural and environmental drivers of gross primary productivity (GPP) and ecosystem respiration (Reco) in highly heterogeneous tundra is a major challenge for the upscaling of chamberbased CO2 fluxes in Arctic landscapes. In a mountain birch woodland-mire ecotone, we inves...
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ftnerc:oai:nora.nerc.ac.uk:522492 2023-05-15T14:26:40+02:00 Environmental and vegetation drivers of seasonal CO2 fluxes in a sub-arctic forest–mire ecotone Poyatos, Rafael Heinemeyer, Andreas Ineson, Phil Evans, Jonathan G. Ward, Helen C. Huntley, Brian Baxter, Robert 2014-04 text http://nora.nerc.ac.uk/id/eprint/522492/ https://nora.nerc.ac.uk/id/eprint/522492/1/N522492PP.pdf https://link.springer.com/article/10.1007/s10021-013-9728-2 en eng Springer https://nora.nerc.ac.uk/id/eprint/522492/1/N522492PP.pdf Poyatos, Rafael; Heinemeyer, Andreas; Ineson, Phil; Evans, Jonathan G. orcid:0000-0003-4194-1416 Ward, Helen C.; Huntley, Brian; Baxter, Robert. 2014 Environmental and vegetation drivers of seasonal CO2 fluxes in a sub-arctic forest–mire ecotone. Ecosystems, 17 (3). 377-393. https://doi.org/10.1007/s10021-013-9728-2 <https://doi.org/10.1007/s10021-013-9728-2> Publication - Article PeerReviewed 2014 ftnerc https://doi.org/10.1007/s10021-013-9728-2 2023-02-04T19:47:53Z Unravelling the role of structural and environmental drivers of gross primary productivity (GPP) and ecosystem respiration (Reco) in highly heterogeneous tundra is a major challenge for the upscaling of chamberbased CO2 fluxes in Arctic landscapes. In a mountain birch woodland-mire ecotone, we investigated the role of LAI (and NDVI), environmental factors (microclimate, soil moisture), and microsite type across tundra shrub plots (wet hummocks, dry hummocks, dry hollows) and lichen hummocks, in controlling net ecosystem CO2 exchange (NEE). During a growing season, we measured NEE fluxes continuously, with closed dynamic chambers,andperformedmultiple fits (onefor each 3-day period) of a simple light and temperature response model to hourlyNEE data. Tundra shrub plots were largely CO2 sinks, as opposed to lichen plots, although fluxes were highly variable within microsite type. For tundra shrub plots, microsite type did not influence photosynthetic parameters but it affected basal (that is, temperature-normalized) ecosystem respiration (R0). PAR-normalized photosynthesis (P600) increased with air temperature and declined with increasing vapor pressure deficit. R0 declined with soil moisture and showed an apparent increase with temperature, which may underlie a tight link between GPP and Reco. NDVI was a good proxy for LAI, maximum P600 and maximum R0 of shrub plots. Cumulative CO2 fluxes were strongly correlated with LAI (NDVI) but we observed a comparatively low GPP/LAI in dry hummocks. Our results broadly agree with the reported functional convergence across tundra vegetation, but here we show that the role of decreased productivity in transition zones and the influence of temperature and water balance on seasonal CO2 fluxes in sub-Arctic forest–mire ecotones cannot be overlooked. Article in Journal/Newspaper Arctic Arctic Tundra Natural Environment Research Council: NERC Open Research Archive Arctic Ecosystems 17 3 377 393 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Unravelling the role of structural and environmental drivers of gross primary productivity (GPP) and ecosystem respiration (Reco) in highly heterogeneous tundra is a major challenge for the upscaling of chamberbased CO2 fluxes in Arctic landscapes. In a mountain birch woodland-mire ecotone, we investigated the role of LAI (and NDVI), environmental factors (microclimate, soil moisture), and microsite type across tundra shrub plots (wet hummocks, dry hummocks, dry hollows) and lichen hummocks, in controlling net ecosystem CO2 exchange (NEE). During a growing season, we measured NEE fluxes continuously, with closed dynamic chambers,andperformedmultiple fits (onefor each 3-day period) of a simple light and temperature response model to hourlyNEE data. Tundra shrub plots were largely CO2 sinks, as opposed to lichen plots, although fluxes were highly variable within microsite type. For tundra shrub plots, microsite type did not influence photosynthetic parameters but it affected basal (that is, temperature-normalized) ecosystem respiration (R0). PAR-normalized photosynthesis (P600) increased with air temperature and declined with increasing vapor pressure deficit. R0 declined with soil moisture and showed an apparent increase with temperature, which may underlie a tight link between GPP and Reco. NDVI was a good proxy for LAI, maximum P600 and maximum R0 of shrub plots. Cumulative CO2 fluxes were strongly correlated with LAI (NDVI) but we observed a comparatively low GPP/LAI in dry hummocks. Our results broadly agree with the reported functional convergence across tundra vegetation, but here we show that the role of decreased productivity in transition zones and the influence of temperature and water balance on seasonal CO2 fluxes in sub-Arctic forest–mire ecotones cannot be overlooked. |
format |
Article in Journal/Newspaper |
author |
Poyatos, Rafael Heinemeyer, Andreas Ineson, Phil Evans, Jonathan G. Ward, Helen C. Huntley, Brian Baxter, Robert |
spellingShingle |
Poyatos, Rafael Heinemeyer, Andreas Ineson, Phil Evans, Jonathan G. Ward, Helen C. Huntley, Brian Baxter, Robert Environmental and vegetation drivers of seasonal CO2 fluxes in a sub-arctic forest–mire ecotone |
author_facet |
Poyatos, Rafael Heinemeyer, Andreas Ineson, Phil Evans, Jonathan G. Ward, Helen C. Huntley, Brian Baxter, Robert |
author_sort |
Poyatos, Rafael |
title |
Environmental and vegetation drivers of seasonal CO2 fluxes in a sub-arctic forest–mire ecotone |
title_short |
Environmental and vegetation drivers of seasonal CO2 fluxes in a sub-arctic forest–mire ecotone |
title_full |
Environmental and vegetation drivers of seasonal CO2 fluxes in a sub-arctic forest–mire ecotone |
title_fullStr |
Environmental and vegetation drivers of seasonal CO2 fluxes in a sub-arctic forest–mire ecotone |
title_full_unstemmed |
Environmental and vegetation drivers of seasonal CO2 fluxes in a sub-arctic forest–mire ecotone |
title_sort |
environmental and vegetation drivers of seasonal co2 fluxes in a sub-arctic forest–mire ecotone |
publisher |
Springer |
publishDate |
2014 |
url |
http://nora.nerc.ac.uk/id/eprint/522492/ https://nora.nerc.ac.uk/id/eprint/522492/1/N522492PP.pdf https://link.springer.com/article/10.1007/s10021-013-9728-2 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic Tundra |
genre_facet |
Arctic Arctic Tundra |
op_relation |
https://nora.nerc.ac.uk/id/eprint/522492/1/N522492PP.pdf Poyatos, Rafael; Heinemeyer, Andreas; Ineson, Phil; Evans, Jonathan G. orcid:0000-0003-4194-1416 Ward, Helen C.; Huntley, Brian; Baxter, Robert. 2014 Environmental and vegetation drivers of seasonal CO2 fluxes in a sub-arctic forest–mire ecotone. Ecosystems, 17 (3). 377-393. https://doi.org/10.1007/s10021-013-9728-2 <https://doi.org/10.1007/s10021-013-9728-2> |
op_doi |
https://doi.org/10.1007/s10021-013-9728-2 |
container_title |
Ecosystems |
container_volume |
17 |
container_issue |
3 |
container_start_page |
377 |
op_container_end_page |
393 |
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1766299944268857344 |