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Gewählte Publikation:

Ostonen, I; Truu, M; Helmisaari, HS; Lukac, M; Borken, W; Vanguelova, E; Godbold, DL; Lohmus, K; Zang, U; Tedersoo, L; Preem, JK; Rosenvald, K; Aosaar, J; Armolaitis, K; Frey, J; Kabral, N; Kukumagi, M; Leppalammi-Kujansuu, J; Lindroos, AJ; Merila, P; Napa, U; Nojd, P; Parts, K; Uri, V; Varik, M; Truu, J.
(2017): Adaptive root foraging strategies along a boreal-temperate forest gradient
NEW PHYTOL. 2017; 215(3): 977-991. FullText FullText_BOKU

Abstract:
The tree root-mycorhizosphere plays a key role in resource uptake, but also in the adaptation of forests to changing environments. The 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 degrees N and 69 degrees N) in Europe. Variables describing tree resource uptake structures and processes (absorptive fine root biomass and morphology, nitrogen (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 a shift in soil microbial community structure. The soil carbon (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.
Autor/innen der BOKU Wien:
Godbold Douglas L.
BOKU Gendermonitor:


Find related publications in this database (Keywords)
boreal and temperate forests
climate gradient
ectomycorrhizal (EcM) mycelium
fine and ectomycorrhizal root biomass
root foraging
root morphology
soil and rhizosphere bacteria
soil C : N ratio


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