scholarly journals Histoire tardiglaciaire et postglaciaire de la végétation au mont Shefford, Québec

2011 ◽  
Vol 32 (1) ◽  
pp. 81-93 ◽  
Author(s):  
Pierre Richard
Keyword(s):  
Populus Tremuloides ◽  
Picea Mariana ◽  
Acer Rubrum ◽  
Myrica Gale ◽  
Donnant Lieu

L’analyse pollinique d’une cuvette tourbeuse au mont Shefford, Québec, révèle une première phase lacustre de 11400 à 4 200 ans environ avant l’actuel. Le site fut par la suite occupé par une tourbière à Ericacées et Myrique baumier (Myrica gale), puis par une aulnaie à Alnus rugosa et enfin, par une forêt dominée par l'érable rouge (Acer rubrum). La végétation régionale, après la déglaciation, fut d’abord représentée par un désert de type périglaciaire 11400 ans avant l’actuel (AA), puis par une toundra herbacée d'abord, arbustive ensuite, de 11 400 à 11 100 ans AA. L’afforestation s’est effectuée par des peuplements ouverts d’épinette (Picea mariana) et de peuplier faux-tremble (Populus tremuloides), donnant lieu à une pessière ouverte jusque vers 10 100 ans AA. Le domaine de la sapinière à bouleau blanc peut être proposé pour la végétation couvrant la période de 10 100 à 7500 ans AA, après quoi le domaine de l’érablière à tilleul s’est constitué et a dominé jusqu’à nos jours. Le diagramme du mont Shefford est proposé comme diagramme standard en raison du caractère particulièrement complet des séquences polliniques, les plus anciennes étant contemporaines de l’épisode de Saint-Narcisse (moraine frontale). Des aspects méthodologiques portant sur l’interprétation en termes de végétation sont discutés, et les principales zones d’assemblage pollinique du Québec méridional central sont présentées.

scholarly journals Effect of Propagation Tray Design on Early Stage Root Development of Acer rubrum, Quercus rubra, and Populus tremuloides 1

2017 ◽  
Vol 35 (1) ◽  
pp. 35-40 ◽  
Author(s):  
Darby McGrath ◽  
Jason Henry ◽  
Ryan Munroe ◽  
Erin Agro
Keyword(s):  
Populus Tremuloides ◽  
Root Development ◽  
Root Architecture ◽  
Quercus Rubra ◽  
Early Stage ◽  
Acer Rubrum ◽  
Dry Weight ◽  
Red Oak ◽  
Quaking Aspen ◽  
Red Maple

Abstract This experiment investigated the effect of different plug-tray cell designs on root development of red maple (Acer rubrum), red oak (Quercus rubra), and quaking aspen (Populus tremuloides) seedlings. In April of 2015, seeds of each species were sown into three plug trays with different substrate volumes and grown for 17 weeks. Two trays had permeable walls for air-pruning, one with vertical ribs and one without. The third tray had impermeable plastic cell walls. Harvested seedlings were analyzed for root dry weight, length, volume, surface area and number of deflected roots. Root length per volume was highest in the impermeable-walled tray for red maple and quaking aspen. The total numbers of deflected root systems were higher for all species in the impermeable-walled tray. Seedlings grown in the air-pruning trays had smaller proportions of deflected root masses. Greater substrate volume did not influence root deflection development. The air-pruning tray without vertical ribs had the lowest total number of root masses with misdirected roots and lower proportions of root masses with misdirected roots for all species. These results indicate that improved root architecture in root-air pruning tray designs is achievable in tree propagation; however, vertical plastic structures in air-pruning trays can still cause root deflections. Index words: Deflected roots, air-pruning, seedling, propagation, plugs, root architecture. Species used in the study: red maple (Acer rubrum L.); red oak (Quercus rubra L.); quaking aspen (Populus tremuloides Michx.).

scholarly journals Will changes in root-zone temperature in boreal spring affect recovery of photosynthesis in Picea mariana and Populus tremuloides in a future climate?

2011 ◽  
Vol 31 (11) ◽  
pp. 1204-1216 ◽  
Author(s):  
E. Frechette ◽  
I. Ensminger ◽  
Y. Bergeron ◽  
A. Gessler ◽  
F. Berninger
Keyword(s):  
Populus Tremuloides ◽  
Picea Mariana ◽  
Root Zone ◽  
Future Climate ◽  
Root Zone Temperature ◽  
Boreal Spring ◽  
Zone Temperature

Coarse root biomass allometric equations for Abies balsamea, Picea mariana, Pinus banksiana, and Populus tremuloides in the boreal forest of Ontario, Canada

2011 ◽  
Vol 35 (10) ◽  
pp. 4189-4196 ◽  
Author(s):  
Brian W. Brassard ◽  
Han Y.H. Chen ◽  
Yves Bergeron ◽  
David Paré
Keyword(s):  
Boreal Forest ◽  
Populus Tremuloides ◽  
Picea Mariana ◽  
Root Biomass ◽  
Pinus Banksiana ◽  
Abies Balsamea ◽  
Allometric Equations ◽  
Coarse Root

EFFECT OF HOST AND NONHOST TREES ON THE GROWTH AND DEVELOPMENT OF THE FOREST TENT CATERPILLAR, MALACOSOMA DISSTRIA (LEPIDOPTERA: LASIOCAMPIDAE)

1997 ◽  
Vol 129 (6) ◽  
pp. 991-999 ◽  
Author(s):  
R.W. Nicol ◽  
J.T. Arnason ◽  
B. Helson ◽  
M.M. Abou-Zaid
Keyword(s):  
Populus Tremuloides ◽  
Acer Saccharum ◽  
Larval Growth ◽  
Acer Rubrum ◽  
Malacosoma Disstria ◽  
Forest Tent Caterpillar ◽  
Host Trees ◽  
Growth Inhibitory ◽  
The Many ◽  
Tent Caterpillar

AbstractLarval growth and pupal parameters of the forest tent caterpillar (Malacosoma disstria Hübner) reared on the foliage of two host trees (Populus tremuloides Michx. and Acer saccharum Marsh.) and one nonhost tree (Acer rubrum L.) were quantified. This was achieved by undertaking a larval development bioassay under controlled laboratory conditions, but using fresh leaves collected in two field seasons. Larvae fed foliage of P. tremuloides grew exponentially and began to pupate after 3 weeks. Larvae fed with A. saccharum gained significantly less weight and had a reduced number of larvae pupate, and the pupae weighed significantly less than their counterparts fed on P. tremuloides. All larvae that were fed the foliage of A. rubrum died within 2 weeks. A nutritional utilization bioassay with fourth-instar larvae revealed that the foliage of A. saccharum has a growth-inhibitory component, whereas that of A. rubrum is antifeedant. Reasons are discussed for the discrepancy between the many reports of A. saccharum being a food host for M. disstria in the field and the laboratory results.

Understorey vegetation in boreal Picea mariana and Populus tremuloides stands in British Columbia

2003 ◽  
Vol 14 (2) ◽  
pp. 173-184 ◽  
Author(s):  
Hong Qian ◽  
Karel Klinka ◽  
Rune H. Økland ◽  
Pavel Krestov ◽  
Gordon J. Kayahara
Keyword(s):  
British Columbia ◽  
Populus Tremuloides ◽  
Picea Mariana ◽  
Understorey Vegetation

La végétation de deux tourbières de la municipalité régionale de comté du Haut-Saint-Laurent (Québec)

1987 ◽  
Vol 65 (10) ◽  
pp. 1969-1988 ◽  
Author(s):  
Martin Jean ◽  
André Bouchard
Keyword(s):  
Populus Tremuloides ◽  
Acer Rubrum ◽  
Detrended Correspondence Analysis ◽  
Terrestrial Ecosystems ◽  
Organic Content ◽  
Peat Deposit ◽  
Moisture Regime ◽  
Distribution Analysis ◽  
Chamaedaphne Calyculata ◽  
Community Types

Within a multidisciplinary study of terrestrial ecosystems of the Haut-Saint-Laurent Regional County Municipality, the vegetation of "Large Teafield" and "Small Teafield" peatlands is described from 127 stands. Detrended correspondence analysis and correlations between data indicate that the greatest vegetational variation is expressed by variables related to trophic regime (e.g., pH of peat) and moisture regime (e.g., organic content). In addition to gradient analysis, hierarchical clustering combined with reference to contingency tables is used to characterize the typology along gradients. Mapping of the community types partially relates the distribution analysis to a circular spatial pattern of the vegetation. Highly oligotrophic sites are colonized by low shrubs. Chamaedaphne calyculata is found at the centre of the peatlands, where the peat deposit is thick and fire does not play an important role. Low shrubs dominated by Betula populifolia surround the Chamaedaphne calyculata vegetation and are more affected by burning towards the perimeter. Heavily burned sites are dominated by Epilobium angustifolium. The perimeters of the peatlands are colonized by Betula populifolia or Populus tremuloides open forests, while the most stable forests are dominated by Acer rubrum. Some marshes and swamps are present where the peat deposit is thin. Sixteen community types are described for the study area.

Chromated Copper Arsenate Preservative Treatment of North American Hardwoods. Part 1. CCA Fixation Performance

Holzforschung ◽  
2000 ◽  
Vol 54 (6) ◽  
pp. 577-584 ◽  
Author(s):  
T. Stevanovic Janezic ◽  
P.A. Cooper ◽  
Y.T. Ung
Keyword(s):  
Populus Tremuloides ◽  
North American ◽  
Acer Rubrum ◽  
Chromated Copper Arsenate ◽  
Red Pine ◽  
Red Oak ◽  
Red Maple ◽  
White Birch ◽  
Yellow Poplar ◽  
Copper Arsenate

Summary We have examined chromated copper arsenate (CCA) wood preservative fixation at two selected temperatures in seven common North American hardwood species: red maple (Acer rubrum L.), white birch (Betula papyrifera Marsh.), yellow poplar (Liriodendron tulipifera L.), trembling aspen (Populus tremuloides Michx.), red oak (Quercus rubra L.), basswood (Tilia americana L.) and American beech (Fagus grandifolia Ehrh.). The softwood red pine (Pinus resinosa Ait.) was included for comparison. CCA component fixation was monitored by the expressate method at both 21°C and 50°C under non-drying conditions. Hexavalent chromium (CrVI) and total Cr, Cu and As contents of the expressate were determined at different times during fixation. Based on CCA fixation results it was possible to divide the examined hardwoods into a fast fixing group (beech, red oak and red maple), intermediate group (white birch and red pine) and slow fixing group (aspen, yellow poplar and basswood). The variable fixation rates for the different species could not be directly related to different anatomical and chemical attributes of the studied hardwoods, although there was an apparent relationship with density with more dense species fixing faster than low density species. However, the species differences appeared to be mainly influenced by types and amounts of extractives in the woods. In red maple, extraction resulted in a slowing of the fixation rate, while the opposite effect was seen in red oak.

La végétation forestière du delta de Lanoraie, Québec

1991 ◽  
Vol 69 (8) ◽  
pp. 1839-1852 ◽  
Author(s):  
L. Lamontagne ◽  
C. Camiré ◽  
C. Ansseau
Keyword(s):  
Populus Tremuloides ◽  
Acer Saccharum ◽  
Abies Balsamea ◽  
Acer Rubrum ◽  
Fagus Grandifolia ◽  
The Other ◽  
Moisture Regime ◽  
Acidic Ph ◽  
Mature Trees ◽  
Forest Sites

The vegetation and the soil characteristics of the sandy terraces of the Lanoraie Delta, Quebec, were sampled at 84 forest sites using the methods of Whittaker and Canada Soil Information System. The ordination results show that the soil moisture regime (xeric–hydric) and the pH (3.5–5.0) are the main factors responsible for the spatial distribution of the vegetation. When these results (ordination analysis) and those of the cluster analysis are superimposed, the relationship between the five vegetation groups studied and particular ecological conditions can be seen. Thus, two groups of vegetation dominated by conifers are found in the middle of the terraces. One of these is dominated by Tsuga canadensis and the other by Abies balsamea and Picea rubens. These two groups are found on podzolic, gleyed soils with a mounded microrelief, which are strongly acidic (pH < 3.5) and have a hydric–mesic moisture regime. The remaining three vegetation groups are dominated by deciduous species. Among these, two groups arise from human activities such as logging or farming. One of these is dominated by Fagus grandifolia, Acer saccharum, Acer rubrum, and Quercus rubra and is composed of mature trees. The other is dominated by Pinus strobus, Polulus grandidentata, Populus tremuloides, or Betula papyrifera and is composed of young trees. These two types occupy the edge of the terraces where the topography is flat and the soil podzolic with a moderately to slightly acidic pH (4.0–5.0) and a xeric–mesic moisture regime. Finally the third group, dominated by Acer rubrum, is found on medium acidic (pH = 4.0), gleyed soils with a hydric–mesic moisture regime. This study shows that Acer rubrum is the best suited species for sandy, acidic, and nutrient-poor sites of the Lanoraie Delta. Key words: Lanoraie Delta, multivariate analysis, vegetation classification, Acer rubrum.

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