Results 231 to 240 of about 30,791 (266)

Spruce Beetle Effects on a White Spruce Stand in Alaska

Journal of Forestry, 1974
Abstract A severe infestation of spruce beetle (Dendroctonus rufipennis Kby.) in a white spruce (Picea glauca [Moench] Voss)-paper birch (Betula papyrifera var.) stand caused 64.6 percent mortality of spruce 5 inches d.b.h. and larger where the infestation was completed. Survival of spruce was greater in smaller diameters.
Bruce H. Baker, Jerry A. Kemperman
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COMPARATIVE CHARACTERISTICS OF THE KISLICHNY SPRUCE AND THE DOLGOMOSHNY SPRUCE

Materials of the All-Russian scientific and practical conference dedicated to the 100th anniversary of the birth of Professor Vladimir Ageevich Bugaev "Forestry, forest management, forest management in the 21st century: problems and solutions"
Comparative data on the structure of the kislichny spruce and the Dolgomoshny spruce are present-ed. The objects of the study are located in the Prionezhsky forestry of the Republic of Karelia. The vegetation of the lower tiers was taken into account on circular accounting sites of 10 m2 each. It is shown that the average height and average diameter of
Anatoliy Gryaz'kin, Olga Gavrilova, E. Guryleva   +2 more
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Palaeohistory of the Spruce in Switzerland

Nature, 1970
Pollen and carbon dating suggest that the Post-Glacial spread of the spruce (Picea) in Switzerland has been influenced by human activity. This is different from the situation in the eastern Alps.
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A new hybrid between blue spruce and white spruce

Canadian Journal of Botany, 1969
Controlled pollinations were made within and between blue spruce (Picea pungens Engelm.) and white spruce (Picea glauca (Moench) Voss) in 1967 and 1968. Interspecific hybrids were obtained and verified by comparative measurements of several traits. The cross was successful when either species was used as the female parent.
James W. Hanover, Ronald C. Wilkinson
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Bud and crown architecture of white spruce and black spruce

Trees, 2006
Needle primordia in buds and branch lengths were assessed in the crown of a plantation-grown white spruce tree. There was a gradation in needle primordia in buds in branches within the crown. The largest number of primordia was in the terminal bud of the leading main stem shoot, with the number in first-order whorl lateral shoot terminal buds ...
Stephen J. Colombo, Colin W. G. Templeton   +1 more
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The Sensitivity of Young White Spruce to Spruce Budworm Defoliation

Northern Journal of Applied Forestry, 1991
Abstract Relationships between defoliation and volume growth were determined for 68 young white spruce trees in a 20-year-old plantation defoliated over a 2-year period by the spruce budworm. In the first year of defoliation, intensities ranging from 7 to 89% of the current foliage did not influence volume growth significantly.
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Sprucing up

Transfusion, 2020
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Studies on the holocellulose of Sitka spruce : methylation of spruce holocellulose

2012
Sitka Spruce holocellulose has been prepared by the chlorite procedure as modified by Wise and associates. This material has been subjected to successive methylations. The methoxyl content and yield of the solid residue were determined after each methylation and the methoxyl contents have been compared with corresponding values obtained when extractive-
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Polyembryony in Red Spruce

Science, 1931
H I, Baldwin, W E, Percival
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Ancient Blue Spruce Hiding Among Engelmann Spruce

Results of research in forest health and forest futures in Utah Key Results 1. Ancient trees: Old-growth blue and Engelmann spruce (>300 years, Fig. 1) were scattered throughout closed-canopy stands. 2. Drought stress predominates: Higher precipitation and lower maximum temperatures improve growth — even in a forest at 10,000 ft. 3.
Lutz, James A., Birch, Joseph D.
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