Mass Balances of a Drained and a Rewetted Peatland: on Former Losses and Recent Gains

Drained peatlands are important sources of greenhouse gases and are rewetted to curb these emissions. We study one drained and one rewetted fen in terms of losses—and, after rewetting—gains of organic matter (OM), carbon (C), and peat thickness. We determined bulk density (BD) and ash/OM (and C/OM) ratios for 0.5 cm thick contiguous slices from peat monoliths to calculate losses. Whereas one site has lost 28.5 kg OM m−2 corresponding to annual emissions of ~10 t CO2 ha−1 a−1 over 50 years of effective drainage, the other site has lost 102 kg OM m−2, corresponding to an annual loss of ~30 t CO2 ha−1 a−1 for 30 years of intensive drainage and 6 t CO2 ha−1 a−1 during ~225 years of weak drainage before that. Height losses ranged from 43 to 162 cm. In the 20 years after rewetting, 2.12 kg C m−2 was accumulated, equaling an average annual uptake of ~0.4 kg CO2 m−2 a−1. The results indicate that rewetting can lead to carbon accumulation in fens. This sink function is only small compared with the high emissions that are avoided through rewetting.

[1]  J. Couwenberg,et al.  Roots, Tissues, Cells and Fragments—How to Characterize Peat from Drained and Rewetted Fens , 2020, Soil Systems.

[2]  T. Urich,et al.  From Understanding to Sustainable Use of Peatlands: The WETSCAPES Approach , 2020, Soil Systems.

[3]  D. Young,et al.  Misinterpreting carbon accumulation rates in records from near-surface peat , 2019, Scientific Reports.

[4]  R. van Diggelen.  Mires and Peatlands of Europe: Status, Distribution and Conservation , 2018, Restoration Ecology.

[5]  L. Menichetti,et al.  The underappreciated potential of peatlands in global climate change mitigation strategies , 2018, Nature Communications.

[6]  Julie Talbot,et al.  Insights and issues with estimating northern peatland carbon stocks and fluxes since the Last Glacial Maximum , 2017 .

[7]  Jürgen Augustin,et al.  High emissions of greenhouse gases from grasslands on peat and other organic soils , 2016, Global change biology.

[8]  R. Woerdehoff.  Kohlenstoffspeicherung als Teilziel der strategischen Waldbauplanung , 2016 .

[9]  Pete Smith,et al.  The role of peatlands in climate regulation , 2016 .

[10]  A. Grootjans,et al.  Restoration of temperate fens: matching strategies with site potential , 2016 .

[11]  J. Zeitz,et al.  Organic soils in Germany, their distribution and carbon stocks , 2015 .

[12]  G. Jurasinski,et al.  The effect of biomass harvesting on greenhouse gas emissions from a rewetted temperate fen , 2015 .

[13]  A. Grootjans,et al.  Ecological restoration of rich fens in Europe and North America: from trial and error to an evidence‐based approach , 2015, Biological reviews of the Cambridge Philosophical Society.

[14]  J. Walter,et al.  Soil organic matter to soil organic carbon ratios of peatland soil substrates , 2014 .

[15]  Paweł Rydelek.  ORIGIN AND COMPOSITION OF MINERAL CONSTITUENTS OF FEN PEATS FROM EASTERN POLAND , 2013 .

[16]  H. Joosten,et al.  Expanding NPP analysis to eutrophic and forested sites: Significance of NPPs in a Holocene wood peat section (NE Germany) , 2012 .

[17]  Anne-Gesine Sonneck,et al.  Development of ombrotrophic raised bogs in North-east Germany 17 years after the adoption of a protective program , 2012, Wetlands Ecology and Management.

[18]  J. Couwenberg,et al.  Assessing greenhouse gas emissions from peatlands using vegetation as a proxy , 2011, Hydrobiologia.

[19]  K. Butt,et al.  Dispersal of Calluna vulgaris (L.) Hull. seeds on severely burnt upland moorland , 2010 .

[20]  H. Joosten,et al.  DAMOCLES: a DAshing MOnolith Cutter for fine sectioning of peats and sediments into LargE Slices , 2007 .

[21]  H. Joosten,et al.  Non-pollen palynomorphs from modern Alder carrs and their potential for interpreting microfossil data from peat , 2006 .

[22]  Michael J. Vepraskas,et al.  Estimating primary and secondary subsidence in an organic soil 15, 20, and 30 years after drainage , 2006, Wetlands.

[23]  R. Telford,et al.  The intercept is a poor estimate of a calibrated radiocarbon age , 2004 .

[24]  H. Joosten,et al.  What’s in a name?: Some thoughts on pollen classification, identification, and nomenclature in Quaternary palynology , 2002 .

[25]  G. Coope,et al.  Palaeoecology and stratigraphy of the lateglacial type section at Usselo (the Netherlands) , 1989 .

[26]  Student.  Age , 1989, BMJ : British Medical Journal.

[27]  J. Millette,et al.  Subsidence and Erosion of a Histosol1 , 1982 .

[28]  K. Faegri,et al.  Textbook of Pollen Analysis , 1965 .

[29]  W. W. Weir.  Subsidence of peat lands of the Sacramento-San Joaquin delta, California. , 1950 .

[30]  Steven J. Deverel,et al.  Historic, Recent, and Future Subsidence, Sacramento-San Joaquin Delta, California, USA , 2010 .

[31]  J. Zeitz,et al.  Carbon storage in the peatlands of Mecklenburg-Western Pomerania, north-east Germany. , 2010 .

[32]  H. H. Birks.  PLANT MACROFOSSIL INTRODUCTION , 2007 .

[33]  E. Schulze,et al.  Impacts of forest management on the carbon budget of European beech (Fagus sylvatica) forests , 2006 .