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
comparative analysis of phenolic content and profile, antioxidant capacity, and anti-inflammatory bioactivity in wild alaskan and commercial vaccinium berries.wild alaskan vaccinium berries, v. vitis-idaea (lowbush cranberry) and v. uliginosum (bog blueberry), were investigated in parallel with their commercial berry counterparts, v. macrocarpon (cranberry) and v. angustifolium (lowbush blueberry). lowbush cranberry accumulated about twice the total phenolics (624.4 mg/100 g fw) and proanthocyanidins (278.8 mg/100 g) content as commercial cranberries, but a-type proanthocyanidins were more prevalent in the latter. bog blueberry anthocyanin and total p ...201424219831
plant phenological responses to a long-term experimental extension of growing season and soil warming in the tussock tundra of alaska.climate warming is strongly altering the timing of season initiation and season length in the arctic. phenological activities are among the most sensitive plant responses to climate change and have important effects at all levels within the ecosystem. we tested the effects of two experimental treatments, extended growing season via snow removal and extended growing season combined with soil warming, on plant phenology in tussock tundra in alaska from 1995 through 2003. we specifically monitored ...201526183112
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