Ectomycorrhizal colonization and richness of previously colonized, containerized Picea engelmannii does not vary across clearcuts when planted in mechanically site-prepared mounds
Abstract:The Sicamous Creek silviculture systems trial, which is located at a subalpine forest, comprises five replicated treatments. One-third of the timber volume was removed from 30-ha treatment units using cutblocks of 0.1, 1.0, or 10 ha or single-tree selection. Openings were mechanically site prepared by mounding and planted with nursery-grown containerized Picea engelmannii Parry ex Engelm. seedlings. Seedlings were planted in mineral soil exposed by mounding in all four of the harvested treatments as well as in undisturbed soil in the uncut control treatment. Neither the overall ectomycorrhiza colonization nor the number of ectomycorrhizal morphotypes per seedling varied across the cutblocks or among cutblocks of different sizes. This is in contrast to earlier studies at this site that showed inoculum levels to be significantly higher at 2 m from the forest edge, within the rooting zone of forest trees. We hypothesize that the difference here is due either to (i) competition between native ectomycorrhizal fungi and the ectomycorrhizal fungi present on the spruce at planting or (ii) more homogeneous levels of inoculum in the mineral soil exposed by mounding. Fewer native fungi colonized these seedlings than the nonmycorrhizal seedlings from earlier studies, which had been planted between the mounds.
Document Type: Research Article
Publication date: August 1, 2002
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