Adaptive root foraging strategies along a boreal–temperate forest gradient

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Ostonen , I , Truu , M , Helmisaari , H-S M , Lukac , M , Borken , W , Vanguelova , E , Godbold , D L , Lohmus , K , Zang , U , Tedersoo , L , Jens-Konrad , P , Rosenwald , K , Aosaar , J , Armolaitis , K , Frey , J , Kabral , N , Kukumägi , M , Leppälammi-Kujansuu , J , Lindroos , A-J , Merilä , P , Napa , U , Nöjd , P , Parts , K , Uri , V , Varik , M & Truu , J 2017 , ' Adaptive root foraging strategies along a boreal–temperate forest gradient ' , New Phytologist , vol. 215 , pp. 977-991 .

Title: Adaptive root foraging strategies along a boreal–temperate forest gradient
Author: Ostonen, Ivika; Truu, Marika; Helmisaari, Heljä-Sisko Marketta; Lukac, Martin; Borken, Werner; Vanguelova, Elena; Godbold, Douglas L.; Lohmus, Krista; Zang, Ulrich; Tedersoo, Leho; Jens-Konrad, Preem; Rosenwald, Katrin; Aosaar, Jurgen; Armolaitis, Kestutis; Frey, Jane; Kabral, Naima; Kukumägi, Mai; Leppälammi-Kujansuu, Jaana; Lindroos, Antti-Jussi; Merilä, Päivi; Napa, Ulle; Nöjd, Pekka; Parts, Kaarin; Uri, Veiko; Varik, Mats; Truu, Jaak
Contributor organization: Department of Forest Sciences
Forest Soil Science and Biogeochemistry
Doctoral Programme in Sustainable Use of Renewable Natural Resources
Forest Ecology and Management
Date: 2017
Language: eng
Number of pages: 15
Belongs to series: New Phytologist
ISSN: 1469-8137
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°N and 69°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.
Subject: 4112 Forestry
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
Peer reviewed: Yes
Usage restriction: openAccess
Self-archived version: acceptedVersion
Funder: Unknown funder
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