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Keyword: Douglas-fir

Estimating survival and salvage potential of fire-scarred Douglas-fir

Publications Posted on: July 31, 2019
Please note: The information in Research Note INT-287 is obsolete. The latest information developed by Station scientists on this topic is contained in: Reinhardt, Elizabeth D.; Ryan, Kevin C. 1988. How to estimate tree mortality resulting from underburning. Fire Management Notes. 49(4): 30-36.

Identifying old trees to inform ecological restoration in montane forests of the central Rocky Mountains, USA

Publications Posted on: April 05, 2019
Old trees (defined here as ≥150 years old) can be rare in many forests because of past timber harvest, uncharacteristically severe wildfires, and - increasingly - climate change. Old trees provide unique structural, ecological, scientific, and aesthetic values missing in forests containing only younger trees.

Wildfires and climate change push low-elevation forests across a critical climate threshold for tree regeneration

Publications Posted on: March 21, 2019
Climate change is increasing fire activity in the western United States, which has the potential to accelerate climate-induced shifts in vegetation communities. Wildfire can catalyze vegetation change by killing adult trees that could otherwise persist in climate conditions no longer suitable for seedling establishment and survival.

Fire intensity-Fuel reduction relationships associated with understory burning in Larch/Douglas-fir stands

Documents and Media Posted on: December 19, 2018
Fire has been called everything from bad to good, from friendly hero to villainous foe. Sometimes, it is too naively called natural. The simple fact is that fire is. As long as our climate in the Northern Rocky Mountains remains essentially unchanged, we will have photosynthesis working to produce biomass at rates greater than decomposition can convert that biomass.Document Type: Other Documents

Effects of prescribed fire on soil nitrogen levels in a cutover Douglas-fir/western larch forest

Documents and Media Posted on: November 30, 2018
The effects of a prescribed broadcast fire on soil nitrogen (N) levels and related soil properties were determined following the clearcutting of a 250-year-old Douglasfir/western larch stand in northwestern Montana. Soil N losses from burning amounted to slightly over 90 Ib/acre (100 kg/ha), all from the surface organic layers. This was 6 percent of the total N originally present in the surface 12 inches (30 cm) of soil.Document Type: Other Documents

Case study: Growth of Douglas-fir on cultivated and non-cultivated skid trails in coastal Washington and western Oregon

Documents and Media Posted on: October 26, 2018
Our objective was to quantify soil impacts and compare trends of tree survival and growth among the following treatments: logged-only (control, no soil disturbance); non-cultivated skidtrails; and cultivated skidtrails. Skid trail soil disturbance was classed into two categories: 1) A-horizon puddled and mixed with forest floor organic debris, and 2) some A-horizon removed and the rest mixed with B-horizon.Document Type: Other Documents

Soil organic matter effects on Douglas-fir growth in northern Idaho soils

Documents and Media Posted on: October 17, 2018
Regeneration of Douglas-fir (Pseudotsuga menziesii var. glauca [Beissn.] Franco) usually depends on site manipulation and planting to achieve fully stocked stands.Document Type: Other Documents

Soil source, seed source, and organic-matter content effects on Douglas-fir seedling growth

Documents and Media Posted on: October 03, 2018
Douglas-fir [Pseudotsuga menziesii var. glauca (Beissn.) Franco] seedling success on harvested areas in northern Idaho is often limited on harsh sites because of moisture and nutrient stress. This study was conducted to determine the importance of soil source, seed source, and organic matter on seedling growth and nutrition.Document Type: Other Documents

The integration of planted and natural forests in a regional landscape

Documents and Media Posted on: October 03, 2018
The 10,700 km2 region of northwestern Oregon, USA, is dominated by mountainous forested landscapes fringed by agricultural lands and rapidly expanding urban areas. The Douglas-fir/western-hemlock trees, admixed with other species, in the mild, moist regional climate with rich soils are among the most highly productive of temperate forests. Timber harvest has been the dominant land use for much of this century.Document Type: Other Documents

Historic range of variability for upland vegetation in the Bighorn National Forest, Wyoming

Publications Posted on: August 01, 2018
An approach for synthesizing the results of ecological research pertinent to land management is the analysis of the historic range of variability (HRV) for key ecosystem variables that are affected by management activities. This report provides an HRV analysis for the upland vegetation of the Bighorn National Forest in northcentral Wyoming.

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