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- W970132313 abstract "Ectomycorrhizal fungi (EMF) mediate nutrient exchange between trees and soil in coniferous forests. Nitrogen (N) currently limits net primary productivity (NPP) in many terrestrial ecosystems but N deposition may alleviate this limitation, inducing limitation of phosphorous (P) instead. Studies have shown reductions in production of EMF mycelia (EMM) when trees are alleviated limitation of N, unless limitation of P is induced. Leaching of N is a common symptom in forests exposed to chronic N deposition. Elevated leaching and reduced production of EMM coincide in many studies, but it has not been shown to what extent EMM contributes to mitigate leaching. We incubated fungal ingrowth mesh bags in a spruce forest in a region where N deposition is high, and limitation of NPP hypothesized to transit from N to P. The forest was fertilized with N, P and N and P combined to induce N or P limitation, or alleviate trees from growth limitations of both elements. After 4 months incubation, we added 15N to the mesh bag in order to trace N uptake in mycelia and leaching of N. We found a strong correlation between EMM growth and N retention, resulting in elevated leaching of N where the production of EMM was low. Production of EMM was significantly repressed at N+P fertilized plots but not where N and P were added separately. Recovery of 15N in mycelia did not explain leaching of N. The 15N content per fungal biomass unit, on the other hand, was significantly lower at plots hypothesized to be severely N limited (fertilized with P). We argue that the specific amount of 15N in the mycelia reflects rates of N transfer to trees and we suggest controlled experiments to reveal the mechanisms determining the rate of transfer of fungal N for tree C. Our result indicates that EMM play a pivotal role in retaining N in spruce forest soils, and that the ability to mitigate leaching is strongly dependent on the nutrient status of the soil. In conclusion, leaching of N appears to be determined by the amount of EMM produced, in turn determined by the nutrient status of the soil, as perceived by the tree. (Less)" @default.
- W970132313 created "2016-06-24" @default.
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- W970132313 date "2015-01-01" @default.
- W970132313 modified "2023-09-27" @default.
- W970132313 title "The role of ectomycorrhizal fungi in nitrogen retention in spruce forests fertilized with N, P or N+P" @default.
- W970132313 hasPublicationYear "2015" @default.
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