Article

An incubation study of GHG flux responses to a changing water table linked to biochemical parameters across a peatland restoration chronosequence

Citation

Hermans R, Zahn N, Andersen R, Teh YA, Cowie N & Subke J (2019) An incubation study of GHG flux responses to a changing water table linked to biochemical parameters across a peatland restoration chronosequence. Mires and Peat, 23 (2018/19), Art. No.: 08. http://mires-and-peat.net/pages/volumes/map23/map2308.php; https://doi.org/10.19189/MaP.2018.DW.354

Abstract
Large areas of northern peatlands have been drained and afforested with conifers in the 20th century. This has led to changes in the hydrology of the peatlands, the quality and quantity of organic matter inputs and soil microbial communities, which are all likely to impact on greenhouse gas (GHG) fluxes. Considerable areas of these forest plantations are undergoing restoration, and our aim was to assess whether contrasting compositions of peat, in conjunction with hydrological changes in a controlled lab experiment, impact on GHG fluxes. We incubated vegetation free cores (at 8 °C) from a near-natural bog, restoration sites felled in 1998, 2006, 2012 and a current forest plantation at (a) low water tables, (b) high tables or (c) water tables that were changed from low to high. Results show that peat quality and nutrient availability in the pore water have been altered by the forest plantations, which resulted in dissimilar carbon dioxide (CO2) fluxes between the sites under the same temperature and water table conditions. Higher CO2 fluxes were found in the peat cores from the forest plantations than from sites that have undergone restoration and from the near-natural bog. However, there were few differences in methane (CH4) fluxes from the different sites, indicating that on its own (i.e., in the absence of biotic interactions under field conditions) the effects of forestry on CH4 flux are limited.

Keywords
CO2; CH4; carbon; peat quality; pore water chemistry

Journal
Mires and Peat: Volume 23, Issue 2018/19

StatusPublished
FundersRoyal Society for the Protection of Birds
Publication date31/03/2019
Publication date online31/03/2019
Date accepted by journal24/03/2019
URLhttp://hdl.handle.net/1893/29520
Publisher URLhttp://mires-and-peat.net/pages/volumes/map23/map2308.php
ISSN1819-754X
eISSNMires and Peat