Record ID No. |
516 |
Author(s) |
Luoma, D.L., Stockdale, C.A., Molina, R., Eberhart, J.L. , 2006 |
Affiliation |
Oregon State University, Department of Forest Science, Peavy Hall 154, Corvallis, OR 97331 |
Title |
The spatial influence of Pseudotsuga menziesii retention trees on ectomycorrhiza diversity |
Source. Vol.(no):Page |
Canadian journal of forest research. 36(10): 2561-2573p. |
Categories |
Ectomycorrhiza |
Subjects |
General |
Host |
Trees |
Organism |
EcM., |
Country |
U.S.A., North America |
Abstracts |
Living retention trees are being used in managed forests to promote a variety of values, including the maintenance of biological diversity. Federal forest plans for the northwestern USA include guidelines that require the retention of a minimum of 15% basal area in harvest units, with the goal of facilitating the development of late-seral stand structure, which is an important habitat element for old-growth forest-dependent species. However, effective levels and patterns of green-tree retention are unknown. We present results of a treatment consisting of 15% basal area, evenly dispersed retention (15%D). We quantified changes in the ectomycorrhiza (EM) community after the 15%D treatment, both near and away from retention trees. Pretreatment samples were obtained between 1 and 24 months before tree harvest. Post-treatment samples were collected within 14-25 months of harvest. In areas 8-25 m from retention trees, there was a 50% decline in the number of EM types per soil core from before to after treatment. Soil cores taken > 5 m from retention trees exhibited a shift in EM community structure. EM-type richness was positively correlated with fine-root-tip density. We demonstrate the potential for retention trees to act as refugia for recolonization of newly established seedlings by ectomycorrhizal fungi. |