Phenolic supplements: testing an approach to limit Sphagnum decomposition in a Sphagnum farming system

Talal Asif^1*Line Rochefort¹Chris Freeman²Christian Dunn²Hojeong Kang³Mélina Guêné-Nanchen¹

• ¹Laval University, Quebec, Canada
• ²Bangor Wetlands Group, Bangor University, Bangor, United Kingdom
• ³Yonsei University, Seoul, Seoul, Republic of Korea

Phenolic compounds have been proposed to influence decomposition by inhibiting extracellular enzyme activities, as described in the enzymic latch mechanism (ELM). This study examined the effects of phenolic treatments on Sphagnum decomposition, productivity, and biomass accumulation within a Sphagnum farming system. A split-plot experiment with three phenolic treatments was implemented in two cultivation basins established with mosses dominated by the Acutifolia or Sphagnum subgenus. Phenolic treatments included wood pellets (wood), old roots from peat harrowing (root), and no addition (control). Phenolic additions did not result in a measurable reduction in decomposition rates, nor was Sphagnum productivity or biomass affected by the experimental treatments. Both subgenera were approximately similar small sinks of carbon dioxide (CO2) such as -2 ± 1 g CO2 m -2 d -1 (Acutifolia) and -0.2 ± 0.8 g CO2 m -2 d -1 (Sphagnum). Phenolic additions at both subgenera resulted in higher CO2 values as net ecosystem exchange compared to control, which could be linked to emissions resulting from wood and root decomposition. At both subgenera, phenolic additions neither increased peat phenolic concentration nor inhibited enzyme activities compared to control. The current study did not validate the potential of phenolics in limiting decomposition as theorized in ELM. The short duration of the experiment may have restricted the effect of phenolic products applied at the surface from reaching the ~10 cm depth where peat was sampled. This could explain the absence of the inhibitory effect of phenolic products on enzyme activities. Therefore, it is recommended to do various sample analyses from different depths to better understand phenolics-enzyme interactions in a Sphagnum farming system.