mycorrhizal fungi supply nitrogen to host plants in arctic tundra and boreal forests: 15n is the key signal.symbiotic fungi's role in providing nitrogen to host plants is well-studied in tundra at toolik lake, alaska, but little-studied in the adjoining boreal forest ecosystem. along a 570 km north-south transect from the yukon river to the north slope of alaska, the 15n content was strongly reduced in ectomycorrhizal and ericoid mycorrhizal plants including betula, salix, picea mariana (p. mill.) b.s.p., picea glauca moench (voss), and ericaceous plants. compared with the 15n content of soil, the fol ...200919190704
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