Forest soil biotic communities show few responses to wood ash applications at multiple sites across Canada

Author:

Smenderovac Emily,Emilson Caroline,Porter Teresita,Morris Dave,Hazlett Paul,Diochon Amanda,Basiliko Nathan,Bélanger Nicolas,Markham John,Rutherford P. Michael,van Rees Ken,Jones Trevor,Venier Lisa

Abstract

AbstractThere is interest in utilizing wood ash as an amendment in forestry operations as a mechanism to return nutrients to soils that are removed during harvesting, with the added benefit of diverting this bioenergy waste material from landfill sites. Existing studies have not arrived at a consensus on what the effects of wood ash amendments are on soil biota. We collected forest soil samples from studies in managed forests across Canada that were amended with wood ash to evaluate the effects on arthropod, bacterial and fungal communities using metabarcoding of F230, 16S, 18S and ITS2 sequences as well as enzyme analyses to assess its effects on soil biotic function. Ash amendment did not result in consistent effects across sites, and those effects that were detected were small. Overall, this study suggests that ash amendment applied to managed forest systems in amounts (up to 20 Mg ha−1) applied across the 8 study sties had little to no detectable effects on soil biotic community structure or function. When effects were detected, they were small, and site-specific. These non-results support the application of wood ash to harvested forest sites to replace macronutrients (e.g., calcium) removed by logging operations, thereby diverting it from landfill sites, and potentially increasing stand productivity.

Funder

Natural Resources Canada

Publisher

Springer Science and Business Media LLC

Subject

Multidisciplinary

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