Kraft Pulping and Specific Gravity in the Uppermost Stem of Fertilized Balsam Fir

1975 ◽  
Vol 5 (3) ◽  
pp. 399-402 ◽  
Author(s):  
J. D. Gagnon ◽  
K. Hunt
Keyword(s):  
Specific Gravity ◽  
Boreal Forest ◽  
Kraft Pulping ◽  
Balsam Fir ◽  
Pulp Yield ◽  
Kraft Process ◽  
Forest Region ◽  
The Mean ◽  
Boreal Forest Region

Samples of five pairs of fertilized and non-fertilized 60-year-old natural balsam fir (Abiesbalsamea (L.) Mill.) growing in the Quebec boreal forest region were pulped by the kraft process and the specific gravity was measured. Analyses carried out 7 years after treatment on the last seven terminal internodes revealed the mean pulp yield of trees fertilized exceeded that of non-fertilized by 7%, while the mean specific gravity was about 6% lower.

Fungi of the Canadian boreal forest region: Catulus aquilonius gen. et sp.nov., a hyperparasite on Seuratia millardetii

1978 ◽  
Vol 56 (19) ◽  
pp. 2344-2347 ◽  
Author(s):  
D. Malloch ◽  
C. T. Rogerson
Keyword(s):  
Boreal Forest ◽  
New Genus ◽  
New Genus And Species ◽  
Forest Region ◽  
Canadian Boreal Forest ◽  
Boreal Forest Region

A new genus and species of ascomycetes, Catulus aquilonius, is described, illustrated, and tentatively assigned to the Mycosphaerellaceae. It grows as a parasite on stromata of Seuratia millardetii (Raciborski) Meeker and is characterized by two-celled, setulose ascospores.

C4 grasses from the boreal forest region of northwestern Canada

1988 ◽  
Vol 66 (12) ◽  
pp. 2424-2430 ◽  
Author(s):  
A. G. Schwarz ◽  
R. E. Redmann
Keyword(s):  
Boreal Forest ◽  
High Irradiance ◽  
Published Data ◽  
Kranz Anatomy ◽  
The North ◽  
Forest Region ◽  
Geothermal Activity ◽  
The Mean ◽  
Distichlis Stricta ◽  
Boreal Climate

Six C4 grasses (Distichlis stricta, Muhlenbergia glomerata var. cinnoides, M. mexicana, M. richardsonis, Spartina gracilis, S. pectinata) were found in grassy openings in the boreal forest of northwestern Canada. High carbon isotope ratios and Kranz anatomy confirmed that these northern populations are functionally C4 grasses. Muhlenbergia mexicana was assumed to be a C4 grass on the basis of published data. Recent collections of C4 plants tended to have more negative δ13C values than older collections from northern locations, which may reflect decreases in δ13C of atmospheric CO2 over time. In general, northern C4 species had lower δ13C values than those reported for their southern counterparts. The boreal climate in the north supports C4 species only where the mean minimum temperature for July is at least 7.5 °C. C4 grasses were found in microsites warmed by high irradiance or geothermal activity; many of the sites had saline substrates. Northern C4 populations are rare and unique in the boreal flora and deserve special protection.

scholarly journals Landscape control of uranium and thorium in boreal streams – spatiotemporal variability and the role of wetlands

2012 ◽  
Vol 9 (3) ◽  
pp. 2823-2849 ◽  
Author(s):  
F. Lidman ◽  
C. M. Mörth ◽  
H. Laudon
Keyword(s):  
Boreal Forest ◽  
Gamma Spectrometry ◽  
Spatiotemporal Variability ◽  
Forest Landscape ◽  
Spatiotemporal Variations ◽  
Forest Region ◽  
Boreal Streams ◽  
Landscape Control ◽  
Boreal Forest Region

Abstract. The concentrations of uranium and thorium in ten partly nested streams in the boreal forest region were monitored over a two-year period. Considerable spatiotemporal variations were observed, with little or no correlation between streams. The export of both uranium and thorium varied substantially between the subcatchments, ranging from 1.7 to 30 g km−2 a−1 for uranium and from 3.2 to 24 g km−2 a−1 for thorium. Airborne gamma spectrometry was used to measure the concentrations of uranium and thorium in surface soils throughout the catchment, but could not explain the variability in the export. Instead, the extent of lakes and mires within each subcatchment was found to be a stronger predictor for the transport of uranium and thorium. The results indicate that there is a predictable and systematic accumulation of both uranium and thorium in boreal mires. Approximately 65–80 % of uranium and 55–65 % of thorium entering a mire is estimated to be retained in the peat. Overall, accumulation in mires and other types of wetlands is estimated to decrease the fluxes of uranium and thorium from the boreal forest landscape by 30–40 %. The atmospheric deposition of uranium and thorium was also quantified and its contribution to boreal streams was found to be low compared to weathering.

Satellite Based Engineering-Terrain Mapping of Canada's Boreal Forest Region

2000 ◽  
Author(s):  
V Singhroy ◽  
P Barnett ◽  
S M Yatabe ◽  
R Saint-Jean
Keyword(s):  
Boreal Forest ◽  
Terrain Mapping ◽  
Forest Region ◽  
Boreal Forest Region

The mycorrhizal status of boreal plants: additional species from northeastern Ontario

1982 ◽  
Vol 60 (7) ◽  
pp. 1035-1040 ◽  
Author(s):  
D. Malloch ◽  
B. Malloch
Keyword(s):  
Boreal Forest ◽  
Vascular Plants ◽  
Additional Species ◽  
Ericoid Mycorrhizae ◽  
Mycorrhizal Status ◽  
Forest Region ◽  
Arbutoid Mycorrhizae ◽  
Boreal Plants ◽  
Boreal Forest Region

Thirty-one species of vascular plants commonly occurring in the Boreal Forest Region of northeastern Ontario were examined for the presence of mycorrhizae. Two species were ectomycorrhizal, 3 both ecto- and endo-mycorrhizal, and 15 endomycorrhizal. Two species of Ericaceae had ericoid mycorrhizae and one had both ericoid and arbutoid mycorrhizae. Eight species, unexpectedly including three species of Rosaceae and two of Saxifragaceae, completely lacked mycorrhizae. The significance of the findings concerning the Betulaceae, Fraxinus, the Ericaceae, Rosaceae, and Saxifragaceae are discussed, as is occurrence of Cenococcum-type infections among the species.

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