Results 211 to 220 of about 2,041,388 (260)

White Spruce Meets Black Spruce: Dispersal, Postfire Establishment, and Growth in a Warming Climate

Ecological Monographs, 2008
Local distributions of black spruce (Picea mariana) and white spruce (Picea glauca) are largely determined by edaphic and topographic factors in the interior of Alaska, with black spruce dominant on moist permafrost sites and white spruce dominant on drier upland sites.
Jeremy W. Lichstein, Jonathan Dushoff, Anping Chen   +2 more
exaly   +3 more sources

Natural hybridization between black spruce and red spruce

Molecular Ecology, 1997
Using species‐specific random amplified polymorphic DNA (RAPD) markers and morphological characters, natural hybridization between the closely related black spruce Picea mariana (Mill.) B.S.P. and red spruce P. rubens Sarg. was evaluated in natural populations from north‐eastern North America.
M. Perron, J. Bousquet
openaire   +1 more source

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
openaire   +1 more source

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
openaire   +2 more sources

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
openaire   +1 more source

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 ...
openaire   +1 more source

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
openaire   +1 more source

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.
openaire   +1 more source

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.
openaire   +1 more source