Plant growth and ectomycorrhiza formation by transplants on deglaciated land near Exit Glacier, Alaska |
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Authors: | D J Helm E B Allen J M Trappe |
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Institution: | (1) University of Alaska Fairbanks, Agricultural and Forestry Experiment Station, 533 E. Fireweed Ave., Palmer, AK 99645, USA e-mail: pndjh@aurora.alaska.edu, Tel.: +1-907-746-9472, Fax: +1-907-746-2677, US;(2) Department of Botany and Plant Sciences, University of California, Riverside, Riverside, CA 92521-0124, USA, US;(3) Department of Botany and Plant Pathology, Oregon State University, 3200 SW Jefferson Way, Corvallis, OR 97331-4401, USA, US |
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Abstract: | Ectomycorrhiza (EM) formation on plant roots in successional communities may vary with plant species, plant age, and age
of vegetation after disturbance. To evaluate differences in mycorrhizal fungus communities on roots of same-aged seedlings
across a deglaciated chronosequence, indoor-grown bioassay plants of four dominant species Epilobium latifolium L. (dwarf fireweed), Populus balsamifera ssp. trichocarpa (Torr.&Gray) Hult. (black cottonwood), Alnus sinuata (Regel) Rydb. (Sitka alder), and Picea sitchensis (Bong.) Carr. (Sitka spruce) were transplanted into five successional stages (Barren, Isolated Plant, Patchy, Alder, and
Cottonwood) following deglaciation near Exit Glacier, Alaska. The species were selected for their successional status and
mycorrhiza formation potential EM or arbuscular mycorrhiza (AM) or both]. Seedlings were transplanted in June 1992, and half
were harvested at the ends of the two subsequent growing seasons. The EM communities on P. balsamifera differed across the chronosequence while those of the other species did not. Morphotype B dominated the EM on P. balsamifera after the Barren stage, and the greatest EM colonization was in the Isolated Plant and Patchy stages. No AM were found. The
EM observed on even-aged seedlings in this study were a subset of the EM found on naturally occurring plants (seedlings to
mature trees) in a prior study, and some were common to multiple plant species. Most plant growth responses were not significant
across stages or were inconsistent among plant species.
Accepted: 25 December 1998 |
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Keywords: | Ectomycorrhizae Glacier Succession Chronosequence Alnus Populus Picea |
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