Adaptive root foraging strategies along a boreal-temperate 1 forest gradient

Titelangaben

Ostonen, Ivika ; Truu, Marika ; Helmisaari, Heljä-Sisko ; Lukac, Martin ; Borken, Werner ; Vanguelova, Elena ; Godbold, Douglas L. ; Lõhmus, Krista ; Zang, Ulrich ; Tedersoo, Leho ; Preem, Jens-Konrad ; Rosenvald, Katrin ; Aosaar, Jürgen ; Armolaitis, Kęstutis ; Frey, Jane ; Kabral, Naima ; Kukumägi, Mai ; Leppälammi-Kujansuu, Jaana ; Lindroos, Antti-Jussi ; Merilä, Päivi ; Napa, Ülle ; Nöjd, Pekka ; Parts, Kaarin ; Uri, Veiko ; Varik, Mats ; Truu, Jaak:
Adaptive root foraging strategies along a boreal-temperate 1 forest gradient.
In: New Phytologist. Bd. 215 (2017) Heft 3 . - S. 977-991.
ISSN 1469-8137
DOI: https://doi.org/10.1111/nph.14643

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Abstract

• Tree root-mycorhizosphere plays a key role in resource uptake, but also in adaptation of forests to changing environments.• Adaptive foraging mechanisms of ectomycorrhizal (EcM) and fine roots of Picea abies, Pinus sylvestris and Betula pendula were evaluated along a gradient from temperate to subarctic boreal forest (38 sites between latitudes 48°N and 69°N) in Europe. Variables41 describing tree resource uptake structures and processes (absorptive fine root biomass andmorphology, N concentration in absorptive roots, extramatrical mycelium (EMM) biomass, community structure of root-associated EcM fungi, soil and rhizosphere bacteria) were used to analyse relationships between root system functional traits and climate, soil and stand characteristics.• Absorptive fine root biomass per stand basal area increased significantly from temperate to boreal forests, coinciding with longer and thinner root tips with higher tissue density, smaller EMM biomass per root length and with a shift in soil microbial communitystructure. Soil C:N ratio was found to explain most of the variability in absorptive fine root and EMM biomass, root tissue density, N concentration, and rhizosphere bacterial community structure.• We suggest a concept of absorptive fine root foraging strategies involving both qualitative and quantitative changes in the root-mycorrhiza-bacteria continuum along climate and soil C:N gradients.