Ectomycorrhizal fungal diversity, tree diversity and root nutrient relations in a mixed Central European forest.
Identifieur interne : 002285 ( Main/Curation ); précédent : 002284; suivant : 002286Ectomycorrhizal fungal diversity, tree diversity and root nutrient relations in a mixed Central European forest.
Auteurs : Christa Lang [Allemagne] ; Andrea PolleSource :
- Tree physiology [ 1758-4469 ] ; 2011.
Descripteurs français
- KwdFr :
- Allemagne (MeSH), Arbres (microbiologie), Arbres (métabolisme), Biodiversité (MeSH), Microbiologie du sol (MeSH), Mycorhizes (classification), Mycorhizes (croissance et développement), Mycorhizes (métabolisme), Racines de plante (croissance et développement), Racines de plante (microbiologie), Racines de plante (métabolisme), Écologie (MeSH).
- MESH :
- croissance et développement : Mycorhizes, Racines de plante.
- microbiologie : Arbres, Racines de plante.
- métabolisme : Arbres, Mycorhizes, Racines de plante.
- Allemagne, Biodiversité, Microbiologie du sol, Mycorhizes, Écologie.
- Wicri :
- geographic : Allemagne.
English descriptors
- KwdEn :
- Biodiversity (MeSH), Ecology (MeSH), Germany (MeSH), Mycorrhizae (classification), Mycorrhizae (growth & development), Mycorrhizae (metabolism), Plant Roots (growth & development), Plant Roots (metabolism), Plant Roots (microbiology), Soil Microbiology (MeSH), Trees (metabolism), Trees (microbiology).
- MESH :
- geographic : Germany.
- classification : Mycorrhizae.
- growth & development : Mycorrhizae, Plant Roots.
- metabolism : Mycorrhizae, Plant Roots, Trees.
- microbiology : Plant Roots, Trees.
- Biodiversity, Ecology, Soil Microbiology.
Abstract
Knowledge is limited about whether root nutrient concentrations are affected by mixtures of tree species and interspecific root competition. The goal of this field study was to investigate root nutrient element concentrations in relation to root and ectomycorrhizal (EM) diversity in six different mixtures of beech (Fagus sylvatica), ash (Fraxinus excelsior) and lime (Tilia sp.) in an old-growth, undisturbed forest ecosystem. Root biomass and nutrient concentrations per tree taxon as well as the abundance and identity of all EM fungi were determined in soil cores of a volume of 1 L (r=40 mm, depth=200 mm). Stand-level nutrient concentrations in overall root biomass and H' (Shannon-Wiener diversity) were obtained by pooling the data per stand. At stand level, Shannon H' for roots and aboveground tree species abundance were correlated. H' for roots and EM fungi were not correlated because of the contribution of ash roots that form only arbuscular mycorrhizal but no EM associations. Nutrient element concentrations in roots showed taxon-related differences and increased in the following order: beech ≤ lime < ash with the exception of calcium (Ca), which was lower in ash. Stand-level concentrations of Ca, magnesium, potassium and sulfur in roots increased with increasing tree diversity because of two effects: increasing contribution of ash roots to the mixture and increasing Ca accumulation in beech roots with increasing root diversity. On a small scale, increasing root diversity, but not EM diversity, was correlated with decreasing P concentrations in beech roots pointing to interspecific tree competition. Nitrogen (N) concentrations of beech roots were unaltered in relation to root and EM diversity. Opposing behavior was observed for lime and ash: the N concentrations in lime roots increased, whereas those in ash roots decreased with increasing EM diversity in a given soil volume. This suggests that EM diversity facilitates N acquisition of lime roots at the expense of non-EM ash.
DOI: 10.1093/treephys/tpr042
PubMed: 21636693
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pubmed:21636693Le document en format XML
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<author><name sortKey="Lang, Christa" sort="Lang, Christa" uniqKey="Lang C" first="Christa" last="Lang">Christa Lang</name>
<affiliation wicri:level="1"><nlm:affiliation>Forstbotanik und Baumphysiologie, Büsgen-Institut, Büsgenweg 2, 37077 Göttingen, Germany.</nlm:affiliation>
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<term>Mycorrhizae (classification)</term>
<term>Mycorrhizae (growth & development)</term>
<term>Mycorrhizae (metabolism)</term>
<term>Plant Roots (growth & development)</term>
<term>Plant Roots (metabolism)</term>
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<term>Microbiologie du sol (MeSH)</term>
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<term>Mycorhizes (métabolisme)</term>
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<term>Racines de plante</term>
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<term>Trees</term>
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<term>Mycorhizes</term>
<term>Racines de plante</term>
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<keywords scheme="MESH" xml:lang="fr"><term>Allemagne</term>
<term>Biodiversité</term>
<term>Microbiologie du sol</term>
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<front><div type="abstract" xml:lang="en">Knowledge is limited about whether root nutrient concentrations are affected by mixtures of tree species and interspecific root competition. The goal of this field study was to investigate root nutrient element concentrations in relation to root and ectomycorrhizal (EM) diversity in six different mixtures of beech (Fagus sylvatica), ash (Fraxinus excelsior) and lime (Tilia sp.) in an old-growth, undisturbed forest ecosystem. Root biomass and nutrient concentrations per tree taxon as well as the abundance and identity of all EM fungi were determined in soil cores of a volume of 1 L (r=40 mm, depth=200 mm). Stand-level nutrient concentrations in overall root biomass and H' (Shannon-Wiener diversity) were obtained by pooling the data per stand. At stand level, Shannon H' for roots and aboveground tree species abundance were correlated. H' for roots and EM fungi were not correlated because of the contribution of ash roots that form only arbuscular mycorrhizal but no EM associations. Nutrient element concentrations in roots showed taxon-related differences and increased in the following order: beech ≤ lime < ash with the exception of calcium (Ca), which was lower in ash. Stand-level concentrations of Ca, magnesium, potassium and sulfur in roots increased with increasing tree diversity because of two effects: increasing contribution of ash roots to the mixture and increasing Ca accumulation in beech roots with increasing root diversity. On a small scale, increasing root diversity, but not EM diversity, was correlated with decreasing P concentrations in beech roots pointing to interspecific tree competition. Nitrogen (N) concentrations of beech roots were unaltered in relation to root and EM diversity. Opposing behavior was observed for lime and ash: the N concentrations in lime roots increased, whereas those in ash roots decreased with increasing EM diversity in a given soil volume. This suggests that EM diversity facilitates N acquisition of lime roots at the expense of non-EM ash.</div>
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<Abstract><AbstractText>Knowledge is limited about whether root nutrient concentrations are affected by mixtures of tree species and interspecific root competition. The goal of this field study was to investigate root nutrient element concentrations in relation to root and ectomycorrhizal (EM) diversity in six different mixtures of beech (Fagus sylvatica), ash (Fraxinus excelsior) and lime (Tilia sp.) in an old-growth, undisturbed forest ecosystem. Root biomass and nutrient concentrations per tree taxon as well as the abundance and identity of all EM fungi were determined in soil cores of a volume of 1 L (r=40 mm, depth=200 mm). Stand-level nutrient concentrations in overall root biomass and H' (Shannon-Wiener diversity) were obtained by pooling the data per stand. At stand level, Shannon H' for roots and aboveground tree species abundance were correlated. H' for roots and EM fungi were not correlated because of the contribution of ash roots that form only arbuscular mycorrhizal but no EM associations. Nutrient element concentrations in roots showed taxon-related differences and increased in the following order: beech ≤ lime < ash with the exception of calcium (Ca), which was lower in ash. Stand-level concentrations of Ca, magnesium, potassium and sulfur in roots increased with increasing tree diversity because of two effects: increasing contribution of ash roots to the mixture and increasing Ca accumulation in beech roots with increasing root diversity. On a small scale, increasing root diversity, but not EM diversity, was correlated with decreasing P concentrations in beech roots pointing to interspecific tree competition. Nitrogen (N) concentrations of beech roots were unaltered in relation to root and EM diversity. Opposing behavior was observed for lime and ash: the N concentrations in lime roots increased, whereas those in ash roots decreased with increasing EM diversity in a given soil volume. This suggests that EM diversity facilitates N acquisition of lime roots at the expense of non-EM ash.</AbstractText>
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