scholarly journals Extraction caracterisation et biotransformation de la lignine alcaline de l epinette noire Picea mariana (Mill ) B S P

1994 ◽  
Author(s):  
Marie-Christine Régis
Keyword(s):  
Picea Mariana ◽  
Epinette Noire

Effets du drainage sur la croissance et le statut nutritif d’un peuplement d’épinette noire de structure inéquienne : résultats de 10 ans

2005 ◽  
Vol 81 (4) ◽  
pp. 516-524 ◽  
Author(s):  
Marcel Prévost ◽  
Daniel Dumais ◽  
André P Plamondon
Keyword(s):  
Picea Mariana ◽  
Stand Structure ◽  
Black Spruce ◽  
Tree Height ◽  
Nutrient Content ◽  
Medium Size ◽  
Diameter Growth ◽  
Growth Increase ◽  
Epinette Noire ◽  
Forest Drainage

We present the 10-year results of a forest drainage experiment conducted in a pre-mature uneven-aged black spruce (Picea mariana [Mill.] BSP) stand, in Bas-Saint-Laurent, Québec, Canada. The set up included 20, 30, 40, 50 and 60 m ditch spacings, and the data were pooled in three diameter classes, ≤ 4 cm (small stems), 6–10 cm (medium-size stems) and ≥ 12 cm (large stems), in order to take into account stand structure in the analysis. The diameter growth of large stems (dominant cover, height ~ 8–12 m) was not improved by drainage. Medium-size stems (intermediate story, ~ 4–8 m) showed a better growth at a 5–10 m distance from the ditches, while small stems (understory ~ 1–4 m) reacted well to drainage, proportionally to ditch closeness. Generally, growth and gain attributable to drainage increased with the live crown ratio, from one third of the total tree height. We did not detect any effect of drainage or distance from the nearest ditch on the nutrient content of the current year foliage of the large stems. For small stems, even the individuals located at 25–30 m from the ditches showed a growth increase compared to the control, although the understory did not benefit from full light conditions. Results suggest that drainage aiming at correcting watering-up following harvesting could permit a rapid growth increase of advance growth. Key words: diameter growth, foliar analysis, forest drainage, black spruce, Picea mariana, forested peatland

The vegetation and chemical properties of patterned fens in the Swan Hills, north central Alberta

1975 ◽  
Vol 53 (23) ◽  
pp. 2776-2795 ◽  
Author(s):  
D. H. Vitt ◽  
P. Achuff ◽  
R. E. Andrus
Keyword(s):  
Picea Mariana ◽  
Vascular Plants ◽  
Chemical Properties ◽  
Vegetation Patterns ◽  
North Central ◽  
Water Flows ◽  
Sphagnum Magellanicum ◽  
Ledum Groenlandicum ◽  
Menyanthes Trifoliata ◽  
And Chemical Properties

Three patterned fens in north central Alberta were analyzed to elucidate vegetation patterns in vascular plants and bryophytes. Two flark associations dominated by Menyanthes trifoliata and Carex limosa, both of which had Sphagnum jensenii and Drepanocladus exannulatus phases, were recognized. The strings consist of two associations; one is dominated by Betula glandulosa, Tomenthypnum falcifolium, and Aulacomnium palustre; the second is dominated by Picea mariana, Sphagnum magellanicum, and Ledum groenlandicum. An intensive analysis of one fen reveals that these mires are ‘poor fens’ with a mean pH of 5.2 and Ca2+concentration of 2.3 ppm. The fens occur on low drainage divides and Ca2+ is depleted as water flows through the fens. An ecological series of bryophytes is described in the transitions between flarks and strings.

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