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Rewetting offers rapid climate benefits for tropical and agricultural peatlands but not for forestry‐drained peatlands
Global Biogeochemical Cycles ( IF 4.608 ) Pub Date : 2020-06-24 , DOI: 10.1029/2019gb006503
Paavo Ojanen; Kari Minkkinen

Peat soils drained for agriculture and forestry are important sources of carbon dioxide and nitrous oxide. Rewetting effectively reduces these emissions. However, rewetting also increases methane emissions from the soil and, on forestry‐drained peatlands, decreases the carbon storage of trees. To analyze the effect of peatland rewetting on the climate, we built radiative forcing scenarios for tropical peat soils, temperate and boreal agricultural peat soils, and temperate and boreal forestry‐drained peat soils. The effect of tree and wood product carbon storage in boreal forestry‐drained peatlands was also estimated as a case study for Finland. Rewetting of tropical peat soils resulted in immediate cooling. In temperate and boreal agricultural peat soils, the warming effect of methane emissions offset a major part of the cooling for the first decades after rewetting. In temperate and boreal forestry‐drained peat soils, the effect of rewetting was mostly warming for the first decades. In addition, the decrease in tree and wood product carbon storage further delayed the onset of the cooling effect for decades. Global rewetting resulted in increasing climate cooling, reaching −70 mW (m2 Earth)−1 in 100 years. Tropical peat soils (9.6 million ha) accounted for ca. two thirds and temperate and boreal agricultural peat soils (13.0 million ha) for one third of the cooling. Forestry‐drained peat soils (10.6 million ha) had a negligible effect. We conclude that peatland rewetting is beneficial and important for mitigating climate change, but abandoning tree stands may instead be the best option concerning forestry‐drained peatlands.
更新日期:2020-06-29

 

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