Populus tremuloides

Trembling aspen, Populus tremuloides, 22eRa Near uranium tailings plant vs. control site Leaves 42 DW vs. 11-15 DW 4... 

ASH, white (Fraxinus americana L.) ASPEN, quaking (Populus tremuloides Michz.)... 

Quaking aspen Populus tremuloides Scales of flower buds Ruffed grouse Bonasa sp. Coniferyl benzoate Jakubas etal., 1989... 

Female flowers of dioecious trees are better defended than males. RuflFed grouse, Bonasa umbellus, prefer male flowers of quaking aspen, Populus tremuloides, in winter, and leaves of male specimens in summer (Svoboda and Gullion 1972). Ruffed grouse also feed more on male trees of balsam poplar (Bryant etal, 1991). 

The particular wood species we chose for this study is aspen (Populus tremuloides), which is plentiful in Canada and in the northern U.S.A. The chemical composition we found to be glucan 53.4%, xylan 14.9%, total carbohydrate 79.0%, lignin 17.1% and extractives 3.8%. We would expect total fermentable sugars of about 56% in this sample of aspen in anhydro form (Timell has reported about 60% in another sample (15)) which upon hydrolysis would yield about 1,250 lb wood sugars per ton of wood (dry basis), from the stoichiometry. Theoretical conversion of this sugar to ethanol would yield 640 lb or 81.1 gallons of anhydrous... 

Hu, W.-J. et al.. Compartmentalized expression of two structurally and functionally distinct 4-coumarate CoA ligase genes in aspen Populus tremuloides). Proc. Natl Acad. Scl USA, 95, 5407, 1998. 

Populus tremuloides Michx. Salicin, populin, tannins.99 Reduce fever, relieve pain, antiinflammatory. 

Eleutherocossus senticosus, Gelidium cartilagineum, Laminaria digitata, L. saccharine, L. longicruris, Lobelia pulmonaria, Panax ginseng, P. quinquefolium, Phragmites australis, Prunus mume, Urtica urens Populus tremuloides... 

Populus tremuloides, Salix alba, Salix discolor... 

FIGURE 9 Release of CO2 by complete photolytic degradation of sterile leachate from leaves of the riverine popular tree (Populus tremuloides), grown under ambient atmospheric C02 and doubled C02 concentrations, after one week of microbial decomposition. 

Triazine herbicides are primarily effective in controlling herbaceous weeds. A notable exception is the use of granular hexazinone for controlling woody invaders such as oaks (Quercus spp.) or aspen (Populus tremuloides) in conifer stands on medium- and fine-textured soils in the South or in boreal forests. Hexazinone also is used in the Maritime Provinces of Canada for controlling woody and herbaceous growth in natural Christmas tree stands (Townsend, 1995a). The impact of herbaceous plant cover is somewhat different from that of woody plant competitors, so control strategies on various forest conifer sites may differ. 

Prasad, R. and J.C. Feng (1990). Spotgun-applied hexazinone Release of red pine (Pinus resinosa) from quaking aspen (Populus tremuloides) competition and residue persistence in soil. Weed Technol., 4 371-375. 

Populus tremuloides (aspen) (Salicaceae) PtTIl (4 Cys), PtTI2 PtTI3 (5 Cys) (proprotein 24 kDa) Trypsin (PtTI2) [393]... 

The Hemicelluloses Present in Aspen Wood (Populus tremuloides). Part III. The Constitution of Pentosan and Hexosan Fractions, J. K. N. Jones, E. Merler, and L. E. Wise, Can. J. Chem., 35 (1957) 634-645. 

Heitz, M., Capekmenard, E., Koeberle, P. G., Gagne, J., Chomet, E., et al., Fractionation of populus-tremuloides at the pilot-plant scale - optimization of steam pretreatment conditions using the stake-li technology. Bioresource Technol 1991, 35 (1), 23-32. 

Table 6.2.2. Yields on nitrobenzene and cupric oxide oxidation products from Norway spruce (Picea abies) and aspen (Populus tremuloides) woods...

Aspen (Populus tremuloides) steam explosion ligmnbc - 25 bars, 4 5s 254 415 669 1 63... 

Populus KTI-like Til (22kDa) (Salicaceae) Populus tremuloides (poplar) Putative SERPR inhibitor... 

Rier, S. T., Tuchman, N. C., Wetzel, R. G. Teeri, J. A. (2002). Elevated-C02-induced changes in the chemistry of quaking aspen (Populus tremuloides Michaux) leaf litter subsequent mass loss and microbial response in a stream ecosystem. Journal of the North American Benthological Society, 21, 16-27. 

Study the beavers responses to juvenile vs. adult growth forms. Species used will depend on availability. Best are aspen (Populus tremuloides or P. grandidentata) or cottonwood (Populus deltoides). 

Fig. 8.1 Feeding preferences by free-ranging beavers Castor canadensis) for 3 species of northeastern deciduous trees and shrubs American beech (Fagus grandifolia), quaking aspen Populus tremuloides), striped maple (Acer pensylvanicum), witch hazel (Hamamelis virginiana), witch hobble (Viburnum lantanoides) and yellow birch (Betula alleghaniensis). The experiment was run over 10 days. Each morning the number of remaining sticks was counted. Only one of 10 beech sticks was taken after 10 days, while, at the other extreme, no sticks of aspen and striped maple remained after 4 and 5 days, respectively...

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