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Forest Biology

2007

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Articles 31 - 37 of 37

Full-Text Articles in Life Sciences

Restoring Mixed Conifer Ecosystems To Pre-Fire Suppression Conditions In Crater Lake National Park, Rachel Clark Jan 2007

Restoring Mixed Conifer Ecosystems To Pre-Fire Suppression Conditions In Crater Lake National Park, Rachel Clark

Joint Fire Science Program Briefs (2007-2012)

Mixed-conifer forests dominated by ponderosa pine trees prevail across the Western United States. Once sustained by frequent, low-intensity fires, these ecosystems have changed dramatically as a result of a hundred years of fire suppression resulting in an accumulation of fuels and shade tolerant species. Researchers are finding that reintroducing fire to these systems may be more complicated than once thought. The forests at Crater Lake National Park are a kind of microcosm for the wide-ranging mixed conifer forests across the West. Early efforts to restore fire at Crater Lake showed that older ponderosa pines were at risk of mortality via …


Tested By Fire: What Happens When Wildfires Meet Fuel Treatments?, Valerie Rapp Jan 2007

Tested By Fire: What Happens When Wildfires Meet Fuel Treatments?, Valerie Rapp

Joint Fire Science Program Briefs (2007-2012)

Strong scientific evidence has long been needed on the effectiveness of fuel treatments when subsequent wildfires encounter treated areas. This project studied what happened when wildfires met fuel treatments, using results from five large wildfires in mixed-conifer forests in the Western United States. The relation between fuel treatment effectiveness and wildfire severity differed by treatment type. Recent treatments (less than 10 years old) that reduced surface fuels were generally effective, whether or not thinning had been done first. Combination treatments, with thinning followed by slash disposal, showed the most impressive results, and in fact the effectiveness of combination treatments increased …


A Toolkit For Assessing Fire Hazards, Elise Lequire Jan 2007

A Toolkit For Assessing Fire Hazards, Elise Lequire

Joint Fire Science Program Briefs (2007-2012)

Whether the goal is to improve wildlife habitat, gauge the effects of prescribed burns or wildfire, or assess the unaccustomed conditions and hidden dangers of fallen trees in the aftermath of hurricanes, a suite of tools developed by the Fire and Environmental Research Applications (FERA) Team at the Pacific Northwest Research Station, Pacific Wildland Fire Sciences Laboratory, allows resource managers to estimate fuel loads, fire hazards, and smoke emissions characteristics in a wide range of forest and grassland ecosystems. The Natural Fuels Photo Series, developed by FERA’s Roger Ottmar, is a field guide for resource managers who need a quick …


Effects Of Light Regime And Season Of Clipping On The Growthof Cherrybark Oak, White Oak, Persimmon, And Sweetgum Sprouts, Robert L. Ficklin, Michael G. Shelton Jan 2007

Effects Of Light Regime And Season Of Clipping On The Growthof Cherrybark Oak, White Oak, Persimmon, And Sweetgum Sprouts, Robert L. Ficklin, Michael G. Shelton

Journal of the Arkansas Academy of Science

A mixture of cherrybark oak (Quercus pagoda Raf.), white oak (Q. alba L.), persimmon (Diospyros virginiana L.), and sweetgum (Liquidambar styraciflua L.) seedlings was grown in shadehouses to simulate light conditions beneath a canopy. After the first growing season, two release treatments were implemented (released and not released), and treatments were conducted during two seasons (winter and spring). All seedlings were clipped at 2.5 em from the groundline in height when treatments were imposed. Survival of persimmon and sweetgum was 100% following clipping. There appeared to be a weak seasonal effect on oak survival, especially for white oak; survival was …


Changes In Forest Understory Composition From 1970 To 2003 At The Gordon Natural Area, An Urban Preserve In Chester County, Pennsylvania, Gregory D. Turner, Robin J. Van Meter, Gerard D. Hertel Jan 2007

Changes In Forest Understory Composition From 1970 To 2003 At The Gordon Natural Area, An Urban Preserve In Chester County, Pennsylvania, Gregory D. Turner, Robin J. Van Meter, Gerard D. Hertel

Biology Faculty Publications

No abstract provided.


Past, Present, And Future Old Growth In Frequent-Fire Conifer Forests Of The Western United States, Scott R. Abella, W. Wallace Covington, Peter Z. Fule, Leigh B. Lentile, Andrew J. Sanchez Meador, Penelope Morgan Jan 2007

Past, Present, And Future Old Growth In Frequent-Fire Conifer Forests Of The Western United States, Scott R. Abella, W. Wallace Covington, Peter Z. Fule, Leigh B. Lentile, Andrew J. Sanchez Meador, Penelope Morgan

Public Policy and Leadership Faculty Publications

Old growth in the frequent-fire conifer forests of the western United States, such as those containing ponderosa pine (Pinus ponderosa), Jeffrey pine (P. jeffreyi), giant sequoia (Sequioa giganteum) and other species, has undergone major changes since Euro-American settlement. Understanding past changes and anticipating future changes under different potential management scenarios are fundamental to developing ecologically based fuel reduction or ecological restoration treatments. Some of the many changes that have occurred in these forests include shifts from historically frequent surface fire to no fire or to stand-replacing fire regimes, increases in tree density, increased abundance of fire-intolerant trees, decreases in understory …


Tree Identification And Age Project, Mark Jensen Jan 2007

Tree Identification And Age Project, Mark Jensen

Graduate Research Papers

The purpose of the Tree Identification and Age Project is to use authentic learning activities to extend the current curriculum to include learning that takes place at high levels of cognition. The methods employed integrate higher-order thinking into learning through a hands-on, problem-based approach to authentic scientific investigation. Using a problem-based approach, the learners apply knowledge and skills to solve real problems. The process involves focusing on the problem, identifying relative information, categorizing, critically analyzing, synthesizing that information and effectively communicating the results.