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- Title
Ectomycorrhizal fungi are more sensitive to high soil nitrogen levels in forests exposed to nitrogen deposition.
- Authors
Jörgensen, Karolina; Clemmensen, Karina E.; Wallander, Håkan; Lindahl, Björn D.
- Abstract
Summary: Ectomycorrhizal fungi are essential for nitrogen (N) cycling in many temperate forests and responsive to anthropogenic N addition, which generally decreases host carbon (C) allocation to the fungi. In the boreal region, however, ectomycorrhizal fungal biomass has been found to correlate positively with soil N availability. Still, responses to anthropogenic N input, for instance through atmospheric deposition, are commonly negative.To elucidate whether variation in N supply affects ectomycorrhizal fungi differently depending on geographical context, we investigated ectomycorrhizal fungal communities along fertility gradients located in two nemo‐boreal forest regions with similar ranges in soil N : C ratios and inorganic N availability but contrasting rates of N deposition.Ectomycorrhizal biomass and community composition remained relatively stable across the N gradient with low atmospheric N deposition, but biomass decreased and the community changed more drastically with increasing N availability in the gradient subjected to higher rates of N deposition. Moreover, potential activities of enzymes involved in ectomycorrhizal mobilisation of organic N decreased as N availability increased.In forests with low external input, we propose that stabilising feedbacks in tree‐fungal interactions maintain ectomycorrhizal fungal biomass and communities even in N‐rich soils. By contrast, anthropogenic N input seems to impair ectomycorrhizal functions.
- Subjects
ECTOMYCORRHIZAL fungi; NITROGEN in soils; ATMOSPHERIC deposition; TEMPERATE forests; FUNGAL communities
- Publication
New Phytologist, 2024, Vol 242, Issue 4, p1725
- ISSN
0028-646X
- Publication type
Article
- DOI
10.1111/nph.19509