Utilizing woody materials for fungal-based management of soil nitrogen pools

Anna Clocchiatti* (Corresponding author), S. Emilia Hannula, Maria P.J. Hundscheid, Paulien J.A. klein Gunnewiek, Wietse de Boer

*Corresponding author for this work

Research output: Contribution to journal/periodicalArticleScientificpeer-review

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Abstract

Application of nitrogen fertilizers to reach high crop production is common practice. However, this has a high environmental cost, irrespectively of the synthetic or organic origin of the fertilizer. In particular, intensively managed arable soils often fail to retain excess nitrogen, which leads to contamination of ground- and surface water. Next to abiotic factors like soil texture, limited nitrogen retention is ascribed to low activity of saprotrophic fungi. It has been shown that amendment of arable soils with cellulose-rich materials can effectively stimulate resident saprotrophic fungi. The current study investigated the relationship between fungal dynamics (biomass, composition) and nitrogen immobilization-remobilization dynamics upon soil amendment with woody materials. Mineral nitrogen pools, ergosterol and ITS2 amplicon sequences were analyzed during a 6-month pot experiment. Carbon-rich amendments included sawdusts of deciduous (beech, willow) and coniferous (Douglas fir, larch) tree species, beech wood chips, wheat straw and combinations of these materials. Excess nitrogen derived from the addition of either mineral or organic fertilizer. Deciduous wood sawdust resulted in rapid stimulation of fungal biomass, mainly consisting of saprotrophic Sordariomycetes. This was accompanied by a reduction in the mineral N pool up to 17 kg N t−1 wood, followed by a gradual remobilization. The intensity of nitrogen immobilization depended on the type of woody materials and of fertilizer. Nitrogen immobilization by single amendments of coniferous sawdust was the lowest, but these materials resulted in a prolonged nitrogen retention when combined with beech sawdust. Our conclusion is that fungus-stimulating woody soil amendments have great potential to reduce nitrogen losses in arable soils.

Original languageEnglish
Article number104663
JournalApplied Soil Ecology
Volume181
DOIs
Publication statusPublished - 2023

Keywords

  • Excess nitrogen
  • Nitrogen immobilization
  • Saprotrophic fungi
  • Sawdust amendments
  • Sordariomycetes
  • Sustainable agriculture

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