Changes in turnover rather than production regulate biomass of ectomycorrhizal fungal mycelium across a Pinus sylvestris chronosequence

• DOI: 10.1111/nph.14379
• Publication Date: 2016-12-20T15:22:45Z
• Authors: Andreas Hagenbo; Karina E. Clemmensen; Roger D. Finlay; Julia Kyaschenko; Björn D. Lindahl; Petra Fransson; Alf Ekblad
• Keywords: Chronosequence; Nutrient cycle; Ectomycorrhiza; Cycling

In boreal forest soils, ectomycorrhizal fungi are fundamentally important for carbon (C) dynamics and nutrient cycling. Although their extraradical mycelium (ERM) is pivotal processes such as soil organic matter build-up nitrogen cycling, very little known about its regulation. this study, we quantified ERM production turnover, examined how these two together regulated standing biomass in seven sites forming a chronosequence of 12- to 100-yr-old managed Pinus sylvestris forests. This was done by determining biomass, using ergosterol proxy, sequentially harvested in-growth mesh bags applying mathematical models. declined with increasing age from 1.2 0.5 kg ha-1 d-1 , the increased 50 112 . explained drastic decline mycelial turnover times one time per year age, corresponding mean residence 25 d up 1 yr. Our results demonstrate that main factor regulating across differently aged stands. Explicit inclusion parameters ecosystem C models may significantly improve capacity predict responses mycorrhiza-mediated management environmental changes.