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SP022

Association of ectomycorrhizal mats with Pacific yew and other understory trees at the Andrews Experimental Forest and the southern and western Cascades, Oregon, 1992-1994

  • Creator(s): Robert P. Griffiths
  • PI(s): Robert P. Griffiths
  • Originator(s): Robert P. Griffiths
  • Other researcher(s):
  • Dates of data collection: Jan 7 1992 - Jan 7 1994
  • Data collection status: Study collection is completed and no new collection is planned
  • Data access: Online
  • Access constraint: If data used in publication, the PI will be listed as a coauthor. Whenever these data are presented in whatever form, the PI will be acknowledged.
  • Last update: Feb 8 2002 (Version 2)
<Citation>     <Acknowledgement>     <Disclaimer>    
Griffiths, R. 2002. Association of ectomycorrhizal mats with Pacific yew and other understory trees at the Andrews Experimental Forest and the southern and western Cascades, Oregon, 1992-1994. Long-Term Ecological Research. Forest Science Data Bank, Corvallis, OR. [Database]. Available: http://andlter.forestry.oregonstate.edu/data/abstract.aspx?dbcode=SP022. Accessed 2024-05-07.
Data were provided by the HJ Andrews Experimental Forest research program, funded by the National Science Foundation's Long-Term Ecological Research Program (DEB 2025755), US Forest Service Pacific Northwest Research Station, and Oregon State University.
While substantial efforts are made to ensure the accuracy of data and documentation, complete accuracy of data sets cannot be guaranteed. All data are made available "as is". The Andrews LTER shall not be liable for damages resulting from any use or misinterpretation of data sets.
ABSTRACT:
This study was designed to determine if ectomycorrhizal mats are more likely to be present in soils at the base of common understory trees than in soils distant from trees and to determine if there is a relationship between the occurrence of mats and tree size. The understory trees studied included the Pacific yew (Taxus brevifolia Nutt.) western hemlock (Tsuga heterophylla (Raf.) Sarg) and vine maple (Acer circinatum Pursh). Twelve sites were studied representing a range of climatic conditions and management histories. More than 2,900 plots were surveyed over an 18-month period. It was found that the incidence of ectomycorrhizal mats was higher at the base of all three species of trees when compared with control plots. A statistically significant positive correlation was also observed between the incidence of mats and tree size. When comparing saplings with larger trees, the saplings consistently had a lower incidence of mats. These observations are not consistent with the hypothesis that ectomycorrhizal mats are required for T. brevifolia establishment or survival.

Study Description Download Study Location Information: (CSV)
Ecological Metadata Language: (EML)
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1Association of ectomycorrhizal mats with Pacific yew and other understory trees METADATADATA