Impact of crop type on the greenhouse gas (GHG) emissions of a rewetted cultivated peatland
<p>Raising the water table is an effective way to abate greenhouse gas emissions from cultivated peat soils. We experimented a gradual water table rise at a highly degraded agricultural peat soil site with plots of willow, forage and mixed vegetation (set-aside) in southern Finland. We measure...
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Copernicus Publications
2024-11-01
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| Series: | SOIL |
| Online Access: | https://soil.copernicus.org/articles/10/827/2024/soil-10-827-2024.pdf |
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| author | K. Lång H. Honkanen J. Heikkinen S. Saarnio T. Larmola H. Kekkonen |
| author_facet | K. Lång H. Honkanen J. Heikkinen S. Saarnio T. Larmola H. Kekkonen |
| author_sort | K. Lång |
| collection | DOAJ |
| description | <p>Raising the water table is an effective way to abate greenhouse gas emissions from cultivated peat soils. We experimented a gradual water table rise at a highly degraded agricultural peat soil site with plots of willow, forage and mixed vegetation (set-aside) in southern Finland. We measured the emissions of carbon dioxide (CO<span class="inline-formula"><sub>2</sub></span>), methane (CH<span class="inline-formula"><sub>4</sub></span>) and nitrous oxide (N<span class="inline-formula"><sub>2</sub></span>O) for 4 years. The mean annual groundwater table depth was about 54, 40, 40 and 30 cm in 2019–2022, respectively. The results indicated that a 10 cm rise in the water table depth was able to slow down annual CO<span class="inline-formula"><sub>2</sub></span> emissions from soil respiration by 0.87 Mg CO<span class="inline-formula"><sub>2</sub></span>-C ha<span class="inline-formula"><sup>−1</sup></span>. CH<span class="inline-formula"><sub>4</sub></span> fluxes changed from uptake to emissions with a rise in the water table depth, and the maximum mean annual emission rate was 11 kg CH<span class="inline-formula"><sub>4</sub></span>-C ha<span class="inline-formula"><sup>−1</sup></span>. Nitrous oxide emissions ranged from 2 to 33 kg N<span class="inline-formula"><sub>2</sub></span>O-N ha<span class="inline-formula"><sup>−1</sup></span> yr<span class="inline-formula"><sup>−1</sup></span>; they were high in bare soil at the beginning of the experiment but decreased towards the end of the experiment. Short rotation cropping of willow reached net sequestration of carbon before harvest, but all treatments and years showed a net loss of carbon based on the net ecosystem carbon balance. Overall, the short rotation coppice of willow had the most favourable carbon and greenhouse gas balance over the years (10 Mg CO<span class="inline-formula"><sub>2</sub></span> eq. on average over 4 years). The total greenhouse gas balance of the forage and set-aside treatments did not go under 27 Mg CO<span class="inline-formula"><sub>2</sub></span> eq. ha<span class="inline-formula"><sup>−1</sup></span> yr<span class="inline-formula"><sup>−1</sup></span>, highlighting the challenge in curbing peat decomposition in highly degraded cultivated peatlands.</p> |
| format | Article |
| id | doaj-art-bf233c004f8a4677bbc139a036e2d8e7 |
| institution | Kabale University |
| issn | 2199-3971 2199-398X |
| language | English |
| publishDate | 2024-11-01 |
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| spelling | doaj-art-bf233c004f8a4677bbc139a036e2d8e72024-11-27T09:31:10ZengCopernicus PublicationsSOIL2199-39712199-398X2024-11-011082784110.5194/soil-10-827-2024Impact of crop type on the greenhouse gas (GHG) emissions of a rewetted cultivated peatlandK. Lång0H. Honkanen1J. Heikkinen2S. Saarnio3T. Larmola4H. Kekkonen5Natural Resources Institute Finland, Latokartanonkaari 9, 00790 Helsinki, FinlandNatural Resources Institute Finland, Latokartanonkaari 9, 00790 Helsinki, FinlandNatural Resources Institute Finland, Latokartanonkaari 9, 00790 Helsinki, FinlandNatural Resources Institute Finland, Latokartanonkaari 9, 00790 Helsinki, FinlandNatural Resources Institute Finland, Latokartanonkaari 9, 00790 Helsinki, FinlandNatural Resources Institute Finland, Latokartanonkaari 9, 00790 Helsinki, Finland<p>Raising the water table is an effective way to abate greenhouse gas emissions from cultivated peat soils. We experimented a gradual water table rise at a highly degraded agricultural peat soil site with plots of willow, forage and mixed vegetation (set-aside) in southern Finland. We measured the emissions of carbon dioxide (CO<span class="inline-formula"><sub>2</sub></span>), methane (CH<span class="inline-formula"><sub>4</sub></span>) and nitrous oxide (N<span class="inline-formula"><sub>2</sub></span>O) for 4 years. The mean annual groundwater table depth was about 54, 40, 40 and 30 cm in 2019–2022, respectively. The results indicated that a 10 cm rise in the water table depth was able to slow down annual CO<span class="inline-formula"><sub>2</sub></span> emissions from soil respiration by 0.87 Mg CO<span class="inline-formula"><sub>2</sub></span>-C ha<span class="inline-formula"><sup>−1</sup></span>. CH<span class="inline-formula"><sub>4</sub></span> fluxes changed from uptake to emissions with a rise in the water table depth, and the maximum mean annual emission rate was 11 kg CH<span class="inline-formula"><sub>4</sub></span>-C ha<span class="inline-formula"><sup>−1</sup></span>. Nitrous oxide emissions ranged from 2 to 33 kg N<span class="inline-formula"><sub>2</sub></span>O-N ha<span class="inline-formula"><sup>−1</sup></span> yr<span class="inline-formula"><sup>−1</sup></span>; they were high in bare soil at the beginning of the experiment but decreased towards the end of the experiment. Short rotation cropping of willow reached net sequestration of carbon before harvest, but all treatments and years showed a net loss of carbon based on the net ecosystem carbon balance. Overall, the short rotation coppice of willow had the most favourable carbon and greenhouse gas balance over the years (10 Mg CO<span class="inline-formula"><sub>2</sub></span> eq. on average over 4 years). The total greenhouse gas balance of the forage and set-aside treatments did not go under 27 Mg CO<span class="inline-formula"><sub>2</sub></span> eq. ha<span class="inline-formula"><sup>−1</sup></span> yr<span class="inline-formula"><sup>−1</sup></span>, highlighting the challenge in curbing peat decomposition in highly degraded cultivated peatlands.</p>https://soil.copernicus.org/articles/10/827/2024/soil-10-827-2024.pdf |
| spellingShingle | K. Lång H. Honkanen J. Heikkinen S. Saarnio T. Larmola H. Kekkonen Impact of crop type on the greenhouse gas (GHG) emissions of a rewetted cultivated peatland SOIL |
| title | Impact of crop type on the greenhouse gas (GHG) emissions of a rewetted cultivated peatland |
| title_full | Impact of crop type on the greenhouse gas (GHG) emissions of a rewetted cultivated peatland |
| title_fullStr | Impact of crop type on the greenhouse gas (GHG) emissions of a rewetted cultivated peatland |
| title_full_unstemmed | Impact of crop type on the greenhouse gas (GHG) emissions of a rewetted cultivated peatland |
| title_short | Impact of crop type on the greenhouse gas (GHG) emissions of a rewetted cultivated peatland |
| title_sort | impact of crop type on the greenhouse gas ghg emissions of a rewetted cultivated peatland |
| url | https://soil.copernicus.org/articles/10/827/2024/soil-10-827-2024.pdf |
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