Record ID No. |
6211 |
Author(s) |
Hobbie E. A.*, Chen J. and Hasselquist N. J. , 2019 |
Affiliation |
*Earth Systems Research Center, University of New Hampshire, Durham, NH, 03833, USA. |
Title |
Fertilization alters nitrogen isotopes and concentrations in ectomycorrhizal fungi and soil in pine forests. |
Source. Vol.(no):Page |
Fungal Ecology. 39: 267-275. |
Categories |
Ectomycorrhiza |
Subjects |
Ecology |
Host |
Pine trees |
Organism |
Lactarius rufus, Russula aeruginea |
Country |
USA |
Abstracts |
To assess how nitrogen (N) availability affected ectomycorrhizal functioning and to test a theoretical model of ectomycorrhizal 15N partitioning, we measured C/N and δ15N in soils and nine fungal taxa in two Swedish N addition experiments. Sporocarp C/N and soil C/N decreased with fertilization, implying that N uptake per unit fungal growth increased. The S horizon was more responsive than the F and H horizons to changes in N addition, with N turnover for these horizons of 24, 57, and 57 y, respectively. Fungal and soil δ15N patterns identified fungal N sources, with N acquisition primarily from the S, F, or H horizon for two, five, and two taxa, respectively. With increasing N availability, sporocarp 15N enrichment increased in five taxa, in agreement with our model of fungal-plant N partitioning. However, it decreased in Lactarius rufus and Russula aeruginea, perhaps indicating shifts towards greater inorganic N uptake in these two taxa. This may relate to the generally lower sensitivity of these taxa to N deposition compared to the Cortinarius and Suillus taxa that fit our model of 15N partitioning. |