Carbon dioxide fluxes and soil carbon storage in relation to long‐term grazing and no grazing in Icelandic semi‐natural grasslands
Abstract Question What is the effect of long‐term grazing and no grazing (NG) on carbon dioxide flux and soil carbon storage in Icelandic semi‐natural grasslands. Location Three farms, with known history of land use, in W Iceland. Methods On each farm, we located an intensively and an extensively gr...
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crwiley:10.1111/avsc.12757 2024-09-09T19:46:49+00:00 Carbon dioxide fluxes and soil carbon storage in relation to long‐term grazing and no grazing in Icelandic semi‐natural grasslands Thorhallsdottir, Anna Gudrun Gudmundsson, Jon Norges Forskningsråd 2023 http://dx.doi.org/10.1111/avsc.12757 https://onlinelibrary.wiley.com/doi/pdf/10.1111/avsc.12757 en eng Wiley http://creativecommons.org/licenses/by/4.0/ Applied Vegetation Science volume 26, issue 4 ISSN 1402-2001 1654-109X journal-article 2023 crwiley https://doi.org/10.1111/avsc.12757 2024-07-11T04:36:18Z Abstract Question What is the effect of long‐term grazing and no grazing (NG) on carbon dioxide flux and soil carbon storage in Icelandic semi‐natural grasslands. Location Three farms, with known history of land use, in W Iceland. Methods On each farm, we located an intensively and an extensively grazed site, which both had been constantly grazed for centuries, and a parallel site with no grazing for over 50 years. We measured net ecosystem exchange (NEE), ecosystem respiration and normalized difference vegetation index on a regular basis over the growing season. Samples were taken from 60 cm deep soil profiles for analysis of soil organic carbon (SOC). Results The grazed sites showed significantly more negative NEE than the NG sites, indicating more carbon dioxide uptake on the grazed sites compared to the NG sites. The normalized difference vegetation index was also significantly higher on the grazed sites. On all farms, the total SOC content was higher in the grazed sites than in the parallel NG sites. Conclusions The study indicates that cessation of grazing decreases productivity and carbon dioxide uptake in a semi‐natural grassland in Iceland, as well as SOC content in the soil. Historically, all the NG sites in the study had the same grazing history as the continuously grazed sites until grazing exclusion. The measured lower SOC on the NG sites seems to indicate that, without grazing, SOC is lost with time and/or grazing is needed to maintain SOC in these grasslands. Article in Journal/Newspaper Iceland Wiley Online Library Applied Vegetation Science 26 4 |
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Abstract Question What is the effect of long‐term grazing and no grazing (NG) on carbon dioxide flux and soil carbon storage in Icelandic semi‐natural grasslands. Location Three farms, with known history of land use, in W Iceland. Methods On each farm, we located an intensively and an extensively grazed site, which both had been constantly grazed for centuries, and a parallel site with no grazing for over 50 years. We measured net ecosystem exchange (NEE), ecosystem respiration and normalized difference vegetation index on a regular basis over the growing season. Samples were taken from 60 cm deep soil profiles for analysis of soil organic carbon (SOC). Results The grazed sites showed significantly more negative NEE than the NG sites, indicating more carbon dioxide uptake on the grazed sites compared to the NG sites. The normalized difference vegetation index was also significantly higher on the grazed sites. On all farms, the total SOC content was higher in the grazed sites than in the parallel NG sites. Conclusions The study indicates that cessation of grazing decreases productivity and carbon dioxide uptake in a semi‐natural grassland in Iceland, as well as SOC content in the soil. Historically, all the NG sites in the study had the same grazing history as the continuously grazed sites until grazing exclusion. The measured lower SOC on the NG sites seems to indicate that, without grazing, SOC is lost with time and/or grazing is needed to maintain SOC in these grasslands. |
author2 |
Norges Forskningsråd |
format |
Article in Journal/Newspaper |
author |
Thorhallsdottir, Anna Gudrun Gudmundsson, Jon |
spellingShingle |
Thorhallsdottir, Anna Gudrun Gudmundsson, Jon Carbon dioxide fluxes and soil carbon storage in relation to long‐term grazing and no grazing in Icelandic semi‐natural grasslands |
author_facet |
Thorhallsdottir, Anna Gudrun Gudmundsson, Jon |
author_sort |
Thorhallsdottir, Anna Gudrun |
title |
Carbon dioxide fluxes and soil carbon storage in relation to long‐term grazing and no grazing in Icelandic semi‐natural grasslands |
title_short |
Carbon dioxide fluxes and soil carbon storage in relation to long‐term grazing and no grazing in Icelandic semi‐natural grasslands |
title_full |
Carbon dioxide fluxes and soil carbon storage in relation to long‐term grazing and no grazing in Icelandic semi‐natural grasslands |
title_fullStr |
Carbon dioxide fluxes and soil carbon storage in relation to long‐term grazing and no grazing in Icelandic semi‐natural grasslands |
title_full_unstemmed |
Carbon dioxide fluxes and soil carbon storage in relation to long‐term grazing and no grazing in Icelandic semi‐natural grasslands |
title_sort |
carbon dioxide fluxes and soil carbon storage in relation to long‐term grazing and no grazing in icelandic semi‐natural grasslands |
publisher |
Wiley |
publishDate |
2023 |
url |
http://dx.doi.org/10.1111/avsc.12757 https://onlinelibrary.wiley.com/doi/pdf/10.1111/avsc.12757 |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Applied Vegetation Science volume 26, issue 4 ISSN 1402-2001 1654-109X |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1111/avsc.12757 |
container_title |
Applied Vegetation Science |
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26 |
container_issue |
4 |
_version_ |
1809916316717416448 |