Rewetting alongside biochar and sulphate addition mitigates greenhouse gas emissions and retain carbon in degraded upland peatlands

作者：Peduruhewa H. Jeewani, Robert W. Brown, Chris Evans, Jack Cook, Benjamin P. Roberts, M. D. Fraser, David R. Chadwick, Davey L. Jones · 发表于：Soil Biology and Biochemistry · 年份：2025 · DOI：10.1016/j.soilbio.2025.109814 · 被引用次数：8 · 研究领域：Peatlands and Wetlands Ecology、Coastal wetland ecosystem dynamics、Botany and Plant Ecology Studies

Peat soils store significant amounts of carbon (C) globally, and increased C sequestration into peatlands could play a role in offsetting anthropogenic greenhouse gas (GHG) emissions. As such, there is a need to find and assess optimal greenhouse gas removal (GGR) interventions to minimise GHG losses, protect current C stocks, and promote further C sequestration. This mesocosm study assessed the additional C storage potential of different C -rich substrates ( Juncus straw or Juncus -derived biochar) and/or FeSO 4 amendments, with a low water table (LW; −15 cm) and high-water table (HW; 0 cm) in intact soil columns (20 cm diam. x 25 cm deep) extracted from degraded upland peat. GHG fluxes, soluble nutrients, changes in microbial community structure and enzyme activity were measured over a one-year period to evaluate the net C storage and their overall GGR potential. HW reduced CO 2 emissions by 28 % compared to LW, while CH 4 emissions increased, ultimately contributing 61 % of the overall CO 2 equivalent (CO 2 eq) GHG emissions in HW cores with no amendments. Organic amendments had a significant effect on CO 2 and CH 4 emissions with the highest cumulative emissions being from the Straw-HW (26.2 t CO 2 eq ha −1 yr −1 ) and the lowest cumulative emissions being from the Biochar + FeSO 4 +HW (7.9 t CO 2 eq ha −1 yr −1 ). Biochar + FeSO 4 +HW led to the strongest net gain in soil C, suppressing decomposition of the native peat-C as well as CH 4 emissions. The application of FeSO...