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The influence of nitrogen fertilization on the carbon economy of Paxillus involutus in ectomycorrhizal association with Betula pendula
Author(s) -
EK H.
Publication year - 1997
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1046/j.1469-8137.1997.00621.x
Subject(s) - paxillus involutus , mycelium , respiration , botany , biology , nitrogen , ammonium , nitrogen cycle , betula pendula , shoot , ectomycorrhiza , mycorrhiza , chemistry , symbiosis , genetics , organic chemistry , bacteria
SUMMARY Mycorrhizal mycelium was allowed to grow into a compartment from which roots were excluded. Ammonium or nitrate was supplied exclusively to the fungus and the respiration rate before and after nitrogen addition was measured. Mycelial respiration in the fungal compartment represented 11–29%, of total fungal and root respiration. The mycelium in the fungal compartment received 20–29% of shoot net assimilation, and 43–64%, of the carbon allocated to the mycelium was respired. The nitrogen‐induced respiration increase ranged, in the fungal compartment, from 54 to 180%.