The mycorrhizal associations of western hemlock Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/ns064922n

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  • Two objectives of this research were to identify fungi which are mycorrhizal with western hemlock and to examine the ecology of hemlock mycorrhizal fungi indigenous to outplanting sites. Another objective was to evaluate the effectiveness of mycorrhizal inoculation in improving the performance of outplanted hemlock seedlings. A list of over 100 mycorrhizal fungi associated with hemlock in the field was compiled. Many of these were tested in pure culture synthesis showing that 18 of them were indeed capable of mycorrhiza formation with hemlock. Due to the frequency with which mycorrhizal hemlock seedlings are found on rotten wood, an additional 18 wood inhabiting fungi were tested with hemlock in pure culture synthesis. Five of these proved to be capable of mycorrhiza formation. Field observations indicate that four more are mycorrhizal with hemlock growing in rotten wood. Nonmycorrhizal western hemlock seedlings planted on two clearcuts in western Oregon were readily colonized by indigenous mycorrhizal fungi. Examination of excavated seedlings every two weeks showed a gradual increase in the proportion of short roots colonized by mycorrhizal fungi through the season. The first mycorrhizae appeared two months after planting. Another experiment showed that nonmycorrhizal containerized hemlock seedlings survived and grew well on both rotten wood and mineral soil. Mycorrhizal colonization took place at the same rate and in the same total numbers in rotten wood and mineral soil. Finally, two outplanting studies were done to compare the performance of mycorrhizal and uninoculated hemlock seedlings. The first of these compared the survival and top growth of two year old containerized western hemlock seedlings outplanted on three plots in each of two areas. Mycorrhizal inoculation significantly improved seedling top growth for two years after planting in both of the areas. Survival was not improved in either area by mycorrhizal inoculation. The second study compared survival, root growth and top growth for outplanted mycorrhizal and uninoculated seedlings on both mineral soil and rotten wood. No growth or survival differences between mycorrhizal and uninoculated seedlings were seen on either substrate the first season after planting. Two additional experiments testing rotten wood as mycorrhizal inoculum were done to support the above observations. They demonstrated that rotten wood can indeed serve as a habitat for mycorrhizal fungi.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-08-27T16:55:38Z (GMT) No. of bitstreams: 1 KroppBradleyR1981.pdf: 756264 bytes, checksum: 22e3aecd3bccb47747d073a74afd74a0 (MD5)
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-08-22T17:17:14Z (GMT) No. of bitstreams: 1 KroppBradleyR1981.pdf: 756264 bytes, checksum: 22e3aecd3bccb47747d073a74afd74a0 (MD5)
  • description.provenance : Made available in DSpace on 2013-08-27T16:55:38Z (GMT). No. of bitstreams: 1 KroppBradleyR1981.pdf: 756264 bytes, checksum: 22e3aecd3bccb47747d073a74afd74a0 (MD5) Previous issue date: 1981-03-19

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