Results 241 to 250 of about 13,891 (287)

Acquired thermotolerance of jack pine, white spruce and black spruce seedlings

Tree Physiology, 1991
The acquired thermotolerance of first-year seedlings of jack pine (Pinus banksiana Lamb.) hardened at 36, 38, 40 or 42 degrees C for 90, 180 or 360 minutes and of black spruce (Picea mariana (Mill.) B.S.P.) hardened at 34, 36, 38 or 40 degrees C for 30, 90, 180 or 360 minutes was determined by comparison of needle damage to that of non-hardened ...
R S, Koppenaal, S J, Colombo, E, Blumwald   +2 more
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Spruce Budworm Defoliation in Relation to Introgression in Red and Black Spruce

Forest Science, 1969
Abstract During a genecological study of the red-black spruce complex in central New Brunswick, it appeared that severity of spruce budworm defoliation was related to the genotype of the individual trees. The closer an individual tree approximated red spruce, the greater the severity of budworm defoliation.
S. A. M. Manley, D. P. Fowler
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A diallel cross in black spruce

Genome, 1987
A complete 7 × 7 diallel of black spruce (Picea mariana (Mill.) B.S.P.), without selfs, planted in three locations, was measured for height growth at several ages. Analysis using Griffing's method 3, model II, demonstrated that general combining ability (GCA) was the dominant genetic component of variation, although specific combining ability (SCA ...
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The glucomannans of sitka and black spruces

2011
A study was made of two glucomannans, one isolated by alkaline borate extraction of Sitka spruce wood and the second from black spruce. These were methylated by the Hakomori procedure employing sodium hydride in dimethyl sulfoxide. Considerable experimentation was done to determine the best conditions for methylation and to demonstrate the utility and ...
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Operational Rooting of Black Spruce Cuttings

Journal of Forestry, 1980
Abstract Approximately one-half million rooted cuttings of black spruce (Picea mariana [Mill.] B.S.P.) were produced from 85 thousand juvenile seedlings in a nine-month period in 1979. Field survival of cuttings out-planted in midsummer on a boreal forest cutover was greater than 90 percent by late fall of the same year.
K. A. Armson, M. Fung, W. R. Bunting
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Diameter distributional trends within mixed black-spruce/balsam-fir and pure black-spruce stand types

Forest Ecology and Management, 1988
Abstract This study describes and compares (i) the diameter distribution of black spruce (Picea mariana (Mill.) B.S.P.) and balsam fir (Abies balsamea (L.) Mill.) within mixed black-spruce/balsam-fir stands, and (ii) the diamter distribution of black spruce within pure stands, at various stages of stand development.
P.F. Newton, V.G. Smith
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Black carbon in Quebec boreal black spruce forests

2013
Wildfires affect boreal forest carbon stocks through consumption of the vegetation and forest floor, and production of black carbon (BC). This by-product of organic matter’s incomplete combustion is an important component of the global soil carbon pool.
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Tangential pitting in black spruce tracheids

Wood Science and Technology, 1977
Tangential pit features were studied in a 55-year old black spruce (Picea mariana (Mill) B.S.P.) tree by means of light and electron microscopy.
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Transgenic Black Spruce (Picea mariana)

2000
Black spruce (Picea mariana) is one of about 40 species of the genus Picea A. Dietr. (family Pinaceae) scattered throughout the cooler parts of the north temperate zone and higher elevations in the south (Farrar 1995). Alone or with white spruce and tamarack [Larix laricina (Du Roi) K. Koch], black spruce forms the northern boundary of tree-form growth.
L. Tian, A. Séguin, R. G. Rutledge, P. J. Charest   +3 more
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Light Cutting in Black Spruce is Practicable

Journal of Forestry, 1945
Abstract A study of growth and mortality in recently cutover stands of swamp black spruce in Minnesota has led to the conclusions that windthrow is not so serious a hazard as is commonly supposed and that partial cutting offers attractive possibilities for maintaining good rates of growth.
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