Effect of water-level drawdown on global climatic warming: Northern peatlands

Jukka Laine, Jouko Silvola, Kimmo Tolonen, Jukka Alm, Hannu Nykänen, Harri Vasander, Tapani Sallantaus, Ilkka Savolainen, Jukka Sinisalo, Pertti Martikainen

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Abstract

Since the last deglaciation, 300-500 Pg carbon have accumulated in northern peatlands (346 mill. ha). While sequestering carbon dioxide ( CO2), these peatlands release considerable amounts of methane ( CH4) to the atmosphere. The greenhouse-gas balance of peatlands may change in the future if summers become warmer and drier, as has been predicted for high latitudes. Subsequent emissions of CH4 would decrease, whereas emissions of CO2 and nitrous oxide ( N2O) would increase. Water-level drawdown has been predicted to enhance the greenhouse impact from northern peatlands. The components of carbon cycling were measured both in undrained and drained peatlands of different trophic levels. The results were drawn together into a single radiative forcing factor, to assess the combined atmospheric effects of water-level drawdown. We present a hypothesis, based on the measured changes in carbon stores in soil and tree stand, and fluxes of CO2, CH4 and N2O after water-level drawdown caused by drainage for forestry. The hypothesis suggests that possible drying arising from climate change would, in fact, decrease the impact of northern peatlands on the total radiative forcing for about one hundred years by c. 0.1 W m-2. This is caused by the decrease in CH4 emissions, fairly small changes in the peat carbon storage, and increase in the tree-stand biomass storage.
Original languageEnglish
Pages (from-to)179-184
JournalAmbio
Volume25
Issue number3
Publication statusPublished - 1996
MoE publication typeA1 Journal article-refereed

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Laine, J., Silvola, J., Tolonen, K., Alm, J., Nykänen, H., Vasander, H., Sallantaus, T., Savolainen, I., Sinisalo, J., & Martikainen, P. (1996). Effect of water-level drawdown on global climatic warming: Northern peatlands. Ambio, 25(3), 179-184. https://www.jstor.org/stable/4314450