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Research article2011Peer reviewed

Nitrogen availability affects saprotrophic basidiomycetes decomposing pine needles in a long term laboratory study

Boberg, Johanna; Näsholm, Torgny; Finlay, Roger; Stenlid, Jan; Lindahl, Björn

Abstract

Fungi, especially basidiomycetous litter decomposers, are pivotal to the turnover of soil organic matter in forest soils. Many litter decomposing fungi have a well-developed capacity to translocate resources in their mycelia, a feature that may significantly affect carbon (C) and nitrogen (N) dynamics in decomposing litter. In an eight-month long laboratory study we investigated how the external availability of N affected the decomposition of Scots pine needles, fungal biomass production, N retention and N-mineralization by two litter decomposing fungi - Marasmius androsaceus and Mycena epipterygia. Glycine additions had a general, positive effect on fungal biomass production and increased accumulated needle mass loss after 8 months, suggesting that low N availability may limit fungal growth and activity in decomposing pine litter. Changes in the needle N pool reflected the dynamics of the fungal mycelium. During late decomposition stages, redistribution of mycelium and N out from the decomposed needles was observed for M. epipterygia, suggesting autophagous self degradation. (C) 2011 Elsevier Ltd and The British Mycological Society. All rights reserved.

Keywords

C-use efficiency; Fungal biomass; Fungal translocation; Litter decomposition; N-mineralization; Nutrient cycling; Pinus sylvestris

Published in

Fungal Ecology
2011, Volume: 4, number: 6, pages: 408-416
Publisher: ELSEVIER SCI LTD