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Keyword: Pseudotsuga menziesii

A regional assessment of the ecological effects of chipping and mastication fuels reduction and forest restoration treatments.

Publications Posted on: December 04, 2019
Over the past several years, fire managers have increased their use of mastication treatments, the on-site disposal of shrubs and small-diameter trees through chipping and shredding. Mastication is a relatively untested management practice that alters the chemical and physical conditions of the forest floor and may influence vegetation regrowth and fuel development for years or decades.

Variability in mixed conifer spatial structure changes understory light environments

Publications Posted on: December 03, 2019
In fire-adapted conifer forests of the Western U.S., changing land use has led to increased forest densities and fuel conditions partly responsible for increasing the extent of high-severity wildfires in the region.

GENGYM: A variable density stand table projection system calibrated for mixed conifer and ponderosa pine stands in the Southwest

Publications Posted on: February 26, 2019
A computerized growth and yield model based on a variable density stand table projection system using 1-inch-wide diameter classes has been developed for projecting expected stand conditions in southwestern mixed conifer and ponderosa pine stands, including the effects of dwarf mistletoe. Stand management options include both even-aged and uneven-aged cutting methods.

Fuel dynamics after a bark beetle outbreak impacts experimental fuel treatments

Publications Posted on: January 30, 2019
Background: Fuel reduction treatments have been widely implemented across the western US in recent decades for both fire protection and restoration. Although research has demonstrated that combined thinning and burning effectively reduces crown fire potential in the few years immediately following treatment, little research has identified effectiveness of thinning and burning treatments beyond a decade.

Minimizing soil compaction in Pacific Northwest forests

Documents and Media Posted on: October 24, 2018
High organic-matter content and other inherent properties make Pacific Northwest forest soils generally low in bulk density, high in porosity, and low in strength. As a consequence, these soils are susceptible to compaction by tractive machines, and stand growth may be decreased from 5 to 15 percent.Document Type: Other Documents

Collaborative restoration effects on forest structure in ponderosa pine-dominated forests of Colorado

Publications Posted on: May 10, 2018
In response to large, severe wildfires in historically fire-adapted forests in the western US, policy initiatives, such as the USDA Forest Service’s Collaborative Forest Landscape Restoration Program (CFLRP), seek to increase the pace and scale of ecological restoration. One required component of this program is collaborative adaptive management, in which monitoring data are used to iteratively evaluate and improve future management actions.

Restoring dry and moist forests of the inland northwestern United States [Chapter 23]

Publications Posted on: April 23, 2018
The complex topography of the Inland Northwestern United States (58.4 million ha) interacts with soils and a highly variable climate to provide a mosaic of dry and moist mixed conifer forest settings.

The making of a scar: How fire scars develop in trees

Science Spotlights Posted on: September 12, 2016
When trees are injured they develop physical and chemical boundaries around the injury wound to resist infection. Trees also grow new wood to close over the injured place. Injuries caused by fires result in fire scars and we use the patterns of scarring among many trees to understand when and how often fires burn.  This research helps to understand the biological process of fire scar formation and use it to improve fire history analysis.

Bioclimatic modeling predicts potential distribution of Armillaria solidipes and Pseudotsuga menziesii (Douglas-fir) under contemporary and changing climates in the interior western U.S.A

Publications Posted on: June 23, 2016
Pseudotsuga menziesii (Douglas-fir) is a dominant component of forest stands in much of western North America. It is an important tree to the timber industry, yielding more timber than any other species in North America. It is also extremely important for wildlife as habitat and food. Many small birds and mammals feed on its seeds . Armillaria solidipes [pending vote to conserve A. ostoyae (Redhead et al.

Relationships among chilling hours, photoperiod, calendar date, cold hardiness, seed source, and storage of Douglas-fir seedlings

Publications Posted on: May 27, 2016
Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) seedlings from three nurseries in the Pacific Northwest United States were lifted on five dates from mid-October through mid-December 2006. Each nursery provided seedlings from a low- and a high-elevation seed lot. Photoperiod and accumulated chilling hours (calculated using two methods) were evaluated throughout the lifting period.

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