Ectomycorrhizal diversity, taxon‐specific traits and root N uptake in temperate beech forests
2023-05-25 | journal article. A publication with affiliation to the University of Göttingen.
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- Authors
- Khokon, Anis Mahmud; Janz, Dennis; Polle, Andrea
- Abstract
- 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.
- Issue Date
- 25-May-2023
- Journal
- The New Phytologist
- ISSN
- 0028-646X; 1469-8137
- eISSN
- 1469-8137
- Language
- English
- Sponsor
- Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659