Development of Ectomycorrhizae in a Douglas-Fir Nursery: I. Seasonal Characteristics
Ectomycorrhizae on Douglas-fir seedlings in fumigated soil were classified as smooth (S-myc) or tomentose (T-myc) according to the texture and color of their mantles. S-myc, which formed more rapidly than T-myc, were present on all seedlings at the 1 + 0 stage. T-myc were present on 22 percent of 12-week-old and 46 to 69 percent of 1 + 0 seedlings. The increase in T-myc during the second growing season was studied. The number of T-myc per g dry weight of roots rose during May and June, coincident with the seasonal rise in soil temperature, to a mean level that also characterized seedlings collected in July, August, and at the 2 + 0 stage (112-128 per g). The number of T-myc per seedling, however, increased in proportion to root weight throughout the growing season. Variation in mycorrhizal abundance within and between sample groups of seedlings was great at all stages of seedling development. Potential opportunities for manipulating mycorrhizal fungi in previously fumigated soil exist during the first several weeks of seedling growth, before indigenous fungal symbionts extensively colonize the root systems. Forest Sci. 20:51-56.
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Document Type: Journal Article
Affiliations: Associate Professor, Department of Plant Pathology, Cornell University, Ithaca, New York 14850
Publication date: 1974-03-01
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Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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