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- Title
Fungal functioning in a pine forest: evidence from a <sup>15</sup> N-labeled global change experiment.
- Authors
Hobbie, Erik A.; Diepen, Linda T. A.; Lilleskov, Erik A.; Ouimette, Andrew P.; Finzi, Adrien C.; Hofmockel, Kirsten S.
- Abstract
We used natural and tracer nitrogen ( N) isotopes in a Pinus taeda free air CO2 enrichment ( FACE) experiment to investigate functioning of ectomycorrhizal and saprotrophic fungi in N cycling., Fungal sporocarps were sampled in 2004 (natural abundance and 15 N tracer) and 2010 (tracer) and δ15 N patterns were compared against litter and soil pools., Ectomycorrhizal fungi with hydrophobic ectomycorrhizas (e.g. Cortinarius and Tricholoma) acquired N from the Oea horizon or deeper. Taxa with hydrophilic ectomycorrhizas acquired N from the Oi horizon ( Russula and Lactarius) or deeper ( Laccaria, Inocybe, and Amanita). 15 N enrichment patterns for Cortinarius and Amanita in 2010 did not correspond to any measured bulk pool, suggesting that a persistent pool of active organic N supplied these two taxa. Saprotrophic fungi could be separated into those colonizing pine cones ( Baeospora), wood, litter ( Oi), and soil ( Ramariopsis), with δ15 N of taxa reflecting substrate differences. 15 N enrichment between sources and sporocarps varied across taxa and contributed to δ15 N patterns., Natural abundance and 15 N tracers proved useful for tracking N from different depths into fungal taxa, generally corresponded to literature estimates of fungal activity within soil profiles, and provided new insights into interpreting natural abundance δ15 N patterns.
- Subjects
NITROGEN isotopes; CARBON dioxide; FOREST litter decomposition; ECTOMYCORRHIZAL fungi; LOBLOLLY pine
- Publication
New Phytologist, 2014, Vol 201, Issue 4, p1431
- ISSN
0028-646X
- Publication type
Article
- DOI
10.1111/nph.12578