In:
New Phytologist, Wiley, Vol. 199, No. 2 ( 2013-07), p. 520-528
Kurzfassung:
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 15 N ‐labelled beech ( F agus 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 15 N 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 15 N 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 15 N accumulation. During later phases, the enrichment of 15 N in T omentella badia was higher than in microbes and other EMF species. Roots and soil accumulated 15 N 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.
Materialart:
Online-Ressource
ISSN:
0028-646X
,
1469-8137
DOI:
10.1111/nph.2013.199.issue-2
Sprache:
Englisch
Verlag:
Wiley
Publikationsdatum:
2013
ZDB Id:
208885-X
ZDB Id:
1472194-6
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