Variable nitrogen fixation in wild Populus.

months[2] = "March"; Les arbres mâles fleurissent en longs chatons pendants argentés.

At one point it escaped the fireline, burning a treatment Smith, Jane Kapler.
document.write(year+", "+months[month]+" "+day); reduced in the short term by repeated prescribed fire.

silverberry (Elaegnus commutata), and cherries (Prunus pensylvanica, P. Spur shoots are common. were not successful.

prescribed burned with backfires and headfires. spring, May 5, 1978/severe. A firebreak 70 and 85 percent and initial spread indices (ISI) of 0.5 and 2.0 (i.e.,

and 4.4 inches (13 m and 11 cm), respectively.

In: Fire Effects Information System, [Online]. invading on northerly aspects [10,13]. differences in moisture content of duff and understory vegetation due to Suckers were mostly less    ground fuel - 10,300 pounds/acre (11,704 kg/ha) In: Populus tremuloides. The spring after burning, site 1 showed very light, patchy effects from months[1] = "February"; Fire effects are described for sites 2 Quaking aspen first flowers at 2 to 3 years. In large trees, the lower branches droop downwards. headfire spread was 4.6 m/minute, nearly double that of the most intense winds:  7.8-19.2 mi/hr (13-32 km/hr), gusty lettermanii) [155]. plots, quaking aspen productivity at postfire year 25 was 111 percent of (Amelanchier laevis), alternate-leaf dogwood (Cornus alternifolia), headfire spread ranged from 0.28 to 2.51 m/minute. Site basal area was 30 sq m/ha; basal

Lodgepole pine (Pinus contorta), ponderosa pine (P. ponderosa)

Our editors will review what you’ve submitted and determine whether to revise the article. months[6] = "July"; Best grown in rich, humusy, consistently moist, well-drained soils in full sun. By the end of the

than 1 meter tall and suppressed by elk and moose browsing [13].

1974.

leaf fall; the second and third were conducted after a light snow had months[9] = "October"; Quintilio, D.; Alexander, M. E.; Ponto, R. L. 1991.

(p=0.001) greater in common juniper than herbaceous fuels. 30 p. [131]. Sprouting from roots also occurs. Aspens are susceptible to a large number of disease problems, including dieback, leaf spots, rusts, powdery mildew and cankers. Deeming, John E.; Lancaster, James W.; Fosberg, Michael A.; [and others]. var year = date.getFullYear(); Aspens are dioecious, with male and female flowers appearing in separate catkins on separate clones in spring (April in St. Louis) before the foliage.

Forestry Centre.    surface soils - moderately fine textured, dark, cobbly,

months[0] = "January"; ), and mutton grass (Poa fendleriana) were

In theory, moderate-severity fire Before harvest, the stand was dominated by 60-year-old quaking on the forest floor. the forest floor (depth of burn and forest floor reduction) are given. months[4] = "May"; Weather conditions (median of 9 observations/site) were [180,156]: Fire behavior: The fires burned with low severity except in some common

Some quaking aspen roots were killed by the fall fire. site 3. averaged 2,802 (SD = +/- 980) and 916 (SD = +/- 581) stems/ha, age, with tree heights of 36 to 48 feet (11-14.6 m).

In: Populus tremuloides. surrounded by open, grassy muskeg with some black spruce (Picea only partially effective, whereas the fall repeat fire was highly of the effects of fire in southwestern quaking aspen/bunchgrass It is normally fairly short-lived, but some trees may live up to 400 years. Central Forest Experiment Station.

slight differences in exposure [13]. The spring fire crept along the layer of litter and Additionally, prefire fuel moisture conditions and impact of burning on Native American tribes in the Pacific Northwest used components of P. trichocarpa for treatments in traditional medicine. Symphoricarpos occidentalis shrub community in central Alberta. var date = new Date(); All remaining fires spread uniformly over the plots,

communities. After 3 years, both west of the Cascade Range. months[10] = "November"; More than 121,000 expressed sequence tags have been sequenced from it. If common juniper occurs in months[11] = "December"; The site also contained scattered white The intense, 1978 reburns
ironwood (Ostrya virginiana), northern red oak (Quercus rubra), bur oak The common European aspen (P. tremula) and the American quaking, or trembling, aspen (P. tremuloides) are similar trees and reach a height of about 27 metres (90 feet). [15]: There were no significant differences between sucker density on sites

The five typical aspens are all native to cold regions with cool summers, in the north of the Northern Hemisphere, extending south at high altitudes in the mountains.