Abstract

Rewetted extracted peatlands are sensitive ecosystems and they can act as greenhouse gas (GHG) sinks or sources due to changes in hydrology, vegetation, and weather conditions. However, studies on GHG emissions from extracted peatlands after rewetting are limited. Methane (CH4) and nitrous oxide (N2O) emission fluxes were determined using the opaque closed chamber method along water level gradients from littoral zones to the open water body of constructed shallow lakes with different vegetation zones in a nutrient-rich rewetted extracted peatland in Sweden. Vegetation communities and their position relative to water level, together with short-term water level fluctuations, such as inundation events and seasonal droughts, and temperature had a significant impact on CH4 emissions fluxes. During "normal" and "dry" conditions and high soil temperatures, CH4 emissions were highest from Carex spp.-Typha latifolia L. communities. During inundation events with water levels > 30 cm, sites with flooded Graminoids-Scirpus spp.-Carex spp. emitted most CH4. Methane emissions from the water body of the constructed shallow lakes were low during all water level conditions and over the temperature ranges observed. Nitrous oxide emissions contributed little to the emission fluxes from the soil-plant-water systems to the atmosphere, and they were only detectable from the sites with Graminoids. In terms of management, the construction of shallow lakes showed great potential for lowering GHG emission fluxes from nutrient rich peatlands after peat extraction, even though the vegetated shore emitted some N2O and CH4.

Keywords

greenhouse gas mitigation; nutrient-rich peatland; post-extraction landform; vegetation communities; wetland restoration

Published in

Soil systems
2020, Volume: 4, number: 1, article number: 17
Publisher: MDPI

SLU Authors

• Jordan, Sabine

  • Department of Soil and Environment, Swedish University of Agricultural Sciences
    

• Strömgren, Monika

  • Department of Soil and Environment, Swedish University of Agricultural Sciences
    

• Fiedler, Jan

  • Department of Soil and Environment, Swedish University of Agricultural Sciences
    

• Lode, Elve

  • Department of Soil and Environment, Swedish University of Agricultural Sciences
    
  • Tallinn University

• Nilsson, Torbjörn

  • Department of Soil and Environment, Swedish University of Agricultural Sciences
    

• Lundin, Lars

  • Department of Soil and Environment, Swedish University of Agricultural Sciences
    

Sustainable Development Goals

Ensure availability and sustainable management of water and sanitation for all
Take urgent action to combat climate change and its impacts


UKÄ Subject classification

Environmental Sciences


Publication identifier

DOI: https://doi.org/10.3390/soilsystems4010017

Permanent link to this page (URI)

https://res.slu.se/id/publ/105710