| Autor: |
Khokon, Anis Mahmud, Janz, Dennis, Polle, Andrea |
| Předmět: |
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| Zdroj: |
New Phytologist; Jul2023, Vol. 239 Issue 2, p739-751, 13p |
| Abstrakt: |
Summary: Roots of forest trees are colonized by a diverse spectrum of ectomycorrhizal (EM) fungal species differing in their nitrogen (N) acquisition abilities. Here, we hypothesized that root N gain is the result of EM fungal diversity or related to taxon‐specific traits for N uptake.To test our hypotheses, we traced 15N enrichment in fine roots, coarse roots and taxon‐specific ectomycorrhizas in temperate beech forests in two regions and three seasons, feeding 1 mM NH4NO3 labelled with either 15NH4+ or 15NO3−.We morphotyped > 45 000 vital root tips and identified 51 of 53 detected EM species by sequencing. EM root tips exhibited strong, fungal taxon‐specific variation in 15N enrichment with higher NH4+ than NO3− enrichment. The translocation of N into the upper parts of the root system increased with increasing EM fungal diversity. Across the growth season, influential EM species predicting root N gain were not identified, probably due to high temporal dynamics of the species composition of EM assemblages.Our results support that root N acquisition is related to EM fungal community‐level traits and highlight the importance of EM diversity for tree N nutrition. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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