Interspecific temporal and spatial differences in the acquisition of litter-derived nitrogen by ectomycorrhizal fungal assemblages
Article first published online: 18 APR 2013
© 2013 The Authors. New Phytologist © 2013 New Phytologist Trust
Volume 199, Issue 2, pages 520–528, July 2013
How to Cite
Pena, R., Tejedor, J., Zeller, B., Dannenmann, M. and Polle, A. (2013), Interspecific temporal and spatial differences in the acquisition of litter-derived nitrogen by ectomycorrhizal fungal assemblages. New Phytologist, 199: 520–528. doi: 10.1111/nph.12272
- Issue published online: 19 JUN 2013
- Article first published online: 18 APR 2013
- Manuscript Accepted: 7 MAR 2013
- Manuscript Received: 4 FEB 2013
- German Science Foundation. Grant Numbers: Po362/17-1, Po362/17-2, 459 Da1217/2-1
- 15N-labelled leaf litter;
- deciduous forest;
- nitrogen uptake;
- stable isotopes
- The spatiotemporal dynamics of, and interspecific differences in, the acquisition of litter-derived nitrogen (N) by natural assemblages of ectomycorrhizal root tips are poorly understood.
- Small cylindrical mesh bags containing 15N-labelled beech (Fagus sylvatica) leaf litter that permit hyphal but not root ingrowth were inserted vertically into the top soil layer of an old-growth beech forest. The lateral transfer of 15N into the circumjacent soil, roots, microbes and ectomycorrhizas was measured during an 18-month exposure period.
- Ectomycorrhial fungi (EMF) showed large interspecific variation in the temporal pattern and extent of 15N accumulation. Initially, when N was mainly available from the leachate, microbes were more efficient at N immobilization than the majority of EMF, but distinct fungal species also showed significant 15N accumulation. During later phases, the enrichment of 15N in Tomentella badia was higher than in microbes and other EMF species. Roots and soil accumulated 15N with a large delay compared with microbes and EMF.
- Because approximately half of the studied fungal species had direct access to N from leaf litter and the remainder to N from leached compounds, we suggest that EMF diversity facilitates the N utilization of the host by capturing N originating from early-released solutes and late degradation products from a recalcitrant source.