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Articles 271 - 276 of 276
Full-Text Articles in Entire DC Network
Causes Of Uprooting And Breakage Of Specimen Giant Sequoia Trees, Douglas D. Piirto, W. Wayne Wilcox, John R. Parmeter, Jr., David L. Wood
Causes Of Uprooting And Breakage Of Specimen Giant Sequoia Trees, Douglas D. Piirto, W. Wayne Wilcox, John R. Parmeter, Jr., David L. Wood
Natural Resources Management and Environmental Sciences
A study of the causes of uprooting and stem failure in old-growth giant sequoia (Sequoia gigantea [Lindl.] Decne) indicated many factors, depending upon the type of failure (by root, stem, or earth). Advanced decay and fire scars were the most frequently associated with failure. In 21 of 33 study trees, one-third or more of the roots were judged too decayed to provide support. Twenty-seven study trees possessed basal fire scars, and 26 fell toward the scarred side. Nine Basidiomycetes, including Fomes annosus, Poria albipellucida, Poria incrassata, and Armillaria mellea, were associated with decayed wood. Carpenter ants were found …
Comparative Properties Of Old- And Young-Growth Giant Sequoia Of Potential Significance To Wood Utilization, Douglas D. Piirto, W. Wayne Wilcox
Comparative Properties Of Old- And Young-Growth Giant Sequoia Of Potential Significance To Wood Utilization, Douglas D. Piirto, W. Wayne Wilcox
Natural Resources Management and Environmental Sciences
A comparative study and a literature review were made on various wood properties (e.g. anatomical characteristics, mechanical properties, specific gravity, content and properties of extractives and decay resistance) of old- and young-growth giant sequoia. Various causes for variability in decay resistance were examined.
Critical Evaluation Of The Pulsed-Current Resistance Meter For Detection Of Decay In Wood, Douglas D. Piirto, W. Wayne Wilcox
Critical Evaluation Of The Pulsed-Current Resistance Meter For Detection Of Decay In Wood, Douglas D. Piirto, W. Wayne Wilcox
Natural Resources Management and Environmental Sciences
An evaluation of a pulsed-current resistance meter ("Shigometer®", Model No. 7950) for facilitating detection of decay was performed on wood blocks of giant sequoia heartwood and of white fir sapwood. As decay progressed over a 12-week incubation period, a trend of lower meter readings was obtained, confirming reported field measurements of other workers. Variability in meter readings in situations where the range in resistance readings between sound and decayed wood is narrow (e.g., giant sequoia heartwood) and apparent inability of the meter to make readings necessary to diagnose decay at MCs common to wood in service without ground or water …
Poria Incrassata In Giant Sequoia, Douglas D. Piirto, John R. Parmeter, W. Wayne Wilcox
Poria Incrassata In Giant Sequoia, Douglas D. Piirto, John R. Parmeter, W. Wayne Wilcox
Natural Resources Management and Environmental Sciences
No abstract provided.
Fomes Annosus In Giant Sequoia, Douglas D. Piirto, John R. Parmeter Jr., F. W. Cobb Jr.
Fomes Annosus In Giant Sequoia, Douglas D. Piirto, John R. Parmeter Jr., F. W. Cobb Jr.
Natural Resources Management and Environmental Sciences
No abstract provided.
The Effects Of Dwarf Mistletoe On The Wood Properties Of Lodgepole Pine, Douglas D. Piirto, Donald L. Crews, Harry E. Troxell
The Effects Of Dwarf Mistletoe On The Wood Properties Of Lodgepole Pine, Douglas D. Piirto, Donald L. Crews, Harry E. Troxell
Natural Resources Management and Environmental Sciences
The effects of dwarf mistletoe (Arceuthobium americanum Nutt. ex. Engelm.) on the wood properties of lodgepole pine (Pinus contorta Dougl.) were studied. The results indicate: a decline in modulus of elasticity, modulus of rupture, and work to proportional limit in both infected and noninfected wood from the infected trees; a higher specific gravity of the infected wood; a higher percentage of alcohol-benzene extractives in the infected wood; an increase in longitudinal shrinkage in both infected and noninfected wood from the same tree; a lower percentage of latewood in wood from infected trees; no significant difference in growth ring …