Cryogenic disturbance and its impact on carbon fluxes in a subarctic heathland
Differential frost heave, along with the associated cryogenic disturbance that accompanies it, is an almost universal feature of arctic landscapes that potentially influences the fate of the soil carbon (C) stored in arctic soils. In this study, we quantify how gross ecosystem photosynthesis (GEP),...
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Umeå universitet, Institutionen för ekologi, miljö och geovetenskap
2015
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Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-112505 https://doi.org/10.1088/1748-9326/10/11/114006 |
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ftumeauniv:oai:DiVA.org:umu-112505 2024-02-11T10:00:57+01:00 Cryogenic disturbance and its impact on carbon fluxes in a subarctic heathland Becher, Marina Olofsson, Johan Klaminder, Jonatan 2015 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-112505 https://doi.org/10.1088/1748-9326/10/11/114006 eng eng Umeå universitet, Institutionen för ekologi, miljö och geovetenskap IOP Publishing Environmental Research Letters, 2015, 10:11, http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-112505 doi:10.1088/1748-9326/10/11/114006 ISI:000367249900010 Scopus 2-s2.0-84949294394 info:eu-repo/semantics/openAccess carbon fluxes non-sorted circle cryoturbation NDVI Earth and Related Environmental Sciences Geovetenskap och miljövetenskap Article in journal info:eu-repo/semantics/article text 2015 ftumeauniv https://doi.org/10.1088/1748-9326/10/11/114006 2024-01-17T23:36:36Z Differential frost heave, along with the associated cryogenic disturbance that accompanies it, is an almost universal feature of arctic landscapes that potentially influences the fate of the soil carbon (C) stored in arctic soils. In this study, we quantify how gross ecosystem photosynthesis (GEP), soil respiration (Re) and the resulting net ecosystem exchange (NEE) vary in a patterned ground system (non-sorted circles) at plot-scale and whole-patterned ground scales in response to cryogenic disturbances (differential heave and soil surface disruption). We found that: (i) all studied non-sorted circles (n=15) acted as net CO2 sources (positive NEE); (ii) GEP showed a weaker decrease than Re in response to increased cryogenic disturbance/decreased humus cover, indicating that undisturbed humus-covered sites are currently the main source of atmospheric CO2 in the studied system. Interestingly, Re fluxes normalized to C pools indicated that C is currently respired more rapidly at sites exposed to cryogenic disturbances; hence, higher NEE fluxes at less disturbed sites are likely an effect of a more slowly degrading but larger total pool that was built up in the past. Our results highlight the complex effects of cryogenic processes on the C cycle at various time scales. Article in Journal/Newspaper Arctic Subarctic Umeå University: Publications (DiVA) Arctic Environmental Research Letters 10 11 114006 |
institution |
Open Polar |
collection |
Umeå University: Publications (DiVA) |
op_collection_id |
ftumeauniv |
language |
English |
topic |
carbon fluxes non-sorted circle cryoturbation NDVI Earth and Related Environmental Sciences Geovetenskap och miljövetenskap |
spellingShingle |
carbon fluxes non-sorted circle cryoturbation NDVI Earth and Related Environmental Sciences Geovetenskap och miljövetenskap Becher, Marina Olofsson, Johan Klaminder, Jonatan Cryogenic disturbance and its impact on carbon fluxes in a subarctic heathland |
topic_facet |
carbon fluxes non-sorted circle cryoturbation NDVI Earth and Related Environmental Sciences Geovetenskap och miljövetenskap |
description |
Differential frost heave, along with the associated cryogenic disturbance that accompanies it, is an almost universal feature of arctic landscapes that potentially influences the fate of the soil carbon (C) stored in arctic soils. In this study, we quantify how gross ecosystem photosynthesis (GEP), soil respiration (Re) and the resulting net ecosystem exchange (NEE) vary in a patterned ground system (non-sorted circles) at plot-scale and whole-patterned ground scales in response to cryogenic disturbances (differential heave and soil surface disruption). We found that: (i) all studied non-sorted circles (n=15) acted as net CO2 sources (positive NEE); (ii) GEP showed a weaker decrease than Re in response to increased cryogenic disturbance/decreased humus cover, indicating that undisturbed humus-covered sites are currently the main source of atmospheric CO2 in the studied system. Interestingly, Re fluxes normalized to C pools indicated that C is currently respired more rapidly at sites exposed to cryogenic disturbances; hence, higher NEE fluxes at less disturbed sites are likely an effect of a more slowly degrading but larger total pool that was built up in the past. Our results highlight the complex effects of cryogenic processes on the C cycle at various time scales. |
format |
Article in Journal/Newspaper |
author |
Becher, Marina Olofsson, Johan Klaminder, Jonatan |
author_facet |
Becher, Marina Olofsson, Johan Klaminder, Jonatan |
author_sort |
Becher, Marina |
title |
Cryogenic disturbance and its impact on carbon fluxes in a subarctic heathland |
title_short |
Cryogenic disturbance and its impact on carbon fluxes in a subarctic heathland |
title_full |
Cryogenic disturbance and its impact on carbon fluxes in a subarctic heathland |
title_fullStr |
Cryogenic disturbance and its impact on carbon fluxes in a subarctic heathland |
title_full_unstemmed |
Cryogenic disturbance and its impact on carbon fluxes in a subarctic heathland |
title_sort |
cryogenic disturbance and its impact on carbon fluxes in a subarctic heathland |
publisher |
Umeå universitet, Institutionen för ekologi, miljö och geovetenskap |
publishDate |
2015 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-112505 https://doi.org/10.1088/1748-9326/10/11/114006 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Subarctic |
genre_facet |
Arctic Subarctic |
op_relation |
Environmental Research Letters, 2015, 10:11, http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-112505 doi:10.1088/1748-9326/10/11/114006 ISI:000367249900010 Scopus 2-s2.0-84949294394 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1088/1748-9326/10/11/114006 |
container_title |
Environmental Research Letters |
container_volume |
10 |
container_issue |
11 |
container_start_page |
114006 |
_version_ |
1790596682966106112 |