Main content area

Effect of urea fertilization on ectomycorrhizae of 20-year-old Tsuga heterophylla

Kernaghan, G., Berch, S., Carter, R.
Canadian journal of forest research 1995 v.25 no.6 pp. 891-901
Tsuga heterophylla, urea, population dynamics, forest litter, pH, soil pH, application rate, ectomycorrhizae, British Columbia
Granular urea (46% N) was applied at rates of 224 and 448 kg N/ha to 4 X 4 m plots within at 20-year-old stand composed almost exclusively of western hemlock (Tsuga heterophylla (Raf.) Sarg.), located in the Mount Seymour Demonstration Forest, North Vancouver, British Columbia. Changes in the abundance of 10 mycorrhizal types (Cenococcum geophilum Fr., Lactarius scrobiculatus (Fr.) Fr., Mycelium radicis atrovirens Melin, Thelephora terrestris Fr., three Russula morphotypes, two unidentified basidiomycetes, and a mantleless morphotype resembling E-strain) were assessed using random soil cores taken at 0, 1, 3, 6, and 11 months after fertilization. On both treated and control plots, total number of fine roots and number of basidiomycetous mycorrhizae remained constant, while C. geophilum mycorrhizae decreased slightly and those lacking mantles increased. The observed changes were independent of fertilizer levels and the shifts in pH brought about by urea hydrolysis.