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Susceptibility of forests in the northeastern USA to nitrogen and sulfur deposition: critical load exceedance and forest health

The objectives of this study were to assess susceptibility to acidification and nitrogen (N) saturation caused by atmospheric deposition to northeastern US forests, evaluate the benefits and shortcomings of making critical load assessments using regional data, and assess the relationship between expected risk (exceedance) and forest health. We calculated the critical...

https://www.fs.usda.gov/treesearch/search?keywords=%22USA%29%22&%3Bf%5B0%5D=author_facet%3A%22LeDoux%2C%20Chris%22&f%5B0%5D=author_facet%3A%22Wolf%2C%20Kathleen%22&f%5B1%5D=author_facet%3A%22Clemons%2C%20Craig%22&f%5B2%5D=author_facet%3A%22Byrne%2C%20John%22&f%5B3%5D=author_facet%3A%22Kennedy%2C%20Robert%22&f%5B4%5D=author_facet%3A%22Robin-Abbott%2C%20Molly%22&f%5B5%5D=author_facet%3A%22Johnson%2C%20Ph.D.%2C%20Adelaide%20%28Di%29%22&f%5B6%5D=author_facet%3A%22Smith%2C%20Max%22

Author(s):

N. Duarte; L.H. Pardo; M.J. Robin-Abbott

Year:

2013

Keywords:

acidification, base cation depletion, forest health, N saturation, simple mass balance model

Source:

Water, Air and Soil Pollution. 224: 1355.

Post-wildfire recovery of riparian vegetation during a period of water scarcity in the southwestern USA

Wildland fires occur with increasing frequency in southwestern riparian forests, yet little is known about the effects of fire on populations of native and exotic vegetation. From 2003 to 2006, we monitored recovering woody vegetation in wildfire sites in the bosque (riparian forest) along the Middle Rio Grande of central New Mexico, USA. To examine recovery potential...

Author(s):

D. Max Smith; Deborah M. Finch; Christian Gunning; Roy Jemison; Jeffrey F. Kelly

Year:

2009

Keywords:

cottonwood, Middle Rio Grande, Populus deltoides ssp. wislizenii, resprout survival, riparian, saltcedar, Tamarix ramosissima, wildland fire

Source:

Fire Ecology Special Issue. 5(1): 38-55.

Assessing the carbon consequences of western juniper (Juniperus occidentalis) encroachment across Oregon, USA

Our ability to assess the continental impacts of woody encroachment remains compromised by the paucity of studies quantifying regional encroachment rates. This knowledge gap is especially apparent when it comes to quantifying the impact of woody encroachment on large-scale carbon dynamics. In this study, we use a combination of aerial photography from 1985-1986 and...

Author(s):

John L. Campbell; Robert E. Kennedy; Warren B. Cohen; Richard F. Miller

Year:

2012

Keywords:

biomass, crown cover, Landsat, reflectance, remote sensing

Source:

Rangeland Ecology and Management. 65(3): 223-231

Climate warming, reduced snow, and freezing injury could explain the demise of yellow-cedar in southeast Alaska, USA

Yellow-cedar (Chamaecyparis nootkatensis) is a valuable tree species that has been experiencing concentrated mortality known as yellow-cedar decline on 200,000 ha of largely pristine forests in Southeast Alaska. Mature trees that regenerated and grew during the Little Ice Age have been dying on low elevation sites with wet soils and open canopies for...

Author(s):

P. Hennon; D. D'Amore; D. Wittwer; A. Johnson; P. Schaberg; G. Hawley; C. Beier; S. Sink; G. Juday

Year:

2006

Keywords:

freezing, forest decline, Chamaecyparis, global warming, snow, exposure

Source:

World Resource Review. 18(2): 427-450.

Response of ponderosa pine stands to pre-commercial thinning on Nez Perce and Spokane Tribal forests in the Inland Northwest, USA

Stands of dense, natural ponderosa pine (Pinus ponderosa var. ponderosa) regeneration were operationally, precommercially thinned at seven sites - four on Nez Perce Tribal lands in northern Idaho and three on Spokane Tribal lands in eastern Washington. Five spacing treatments were studied - control (no thinning), 5x5 ft, 7x7 ft, 10x10 ft, and 14x14 ft. Sample trees...

Author(s):

Dennis E. Ferguson; John C. Byrne; William R. Wykoff; Brian Kummet; Ted Hensold

Year:

2011

Keywords:

Pinus ponderosa, height growth, diameter growth, height/diameter ratios, thinning from below, crown ratios, competing vegetation

Source:

Res. Pap. RMRS-RP-88. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 33 p.

Spatiotemporal dynamics of recent mountain pine beetle and western spruce budworm outbreaks across the Pacific Northwest Region, USA

Across the western US, the two most prevalent native forest insect pests are mountain pine beetle (MPB; Dendroctonus ponderosae; a bark beetle) and western spruce budworm (WSB; Choristoneura freemani; a defoliator). MPB outbreaks have received more forest management attention than WSB outbreaks, but studies to date have not compared their cumulative mortality impacts...

Author(s):

Garrett W. Meigs; Robert E. Kennedy; Andrew N. Gray; Matthew J. Gregory

Year:

2015

Keywords:

bark beetle, change detection, defoliator, forest health, insect disturbance

Source:

Forest Ecology and Management

Does burn severity affect plant community diversity and composition in mixed conifer forests of the United States Intermountain West one decade post fire?

Background: Wildfire is an important ecological process in mixed conifer forests of the Intermountain West region of the USA. However, researchers and managers are concerned because climate warming has led to increased fire activity in recent decades. More area burned will result in larger land areas in early successional stages and will potentially limit tree...

Author(s):

Eva K. Strand; Kevin L. Satterberg; Andrew T. Hudak; John Byrne; Azad Henareh Khalyani; Alistair M. S. Smith

Year:

2019

Keywords:

beta diversity, dispersion, disturbance hypothesis, functional traits, intermediate, invasive species, species diversity, understory

Source:

Fire Ecology. 15: 25.

Impact toughness of cellulose-fiber reinforced polypropylene : influence of microstructure in laminates and injection molded composites

Unlike their glass reinforced counterparts, microstructure and dynamic fracture behavior of natural fiber-reinforced thermoplastics have hardly been investigated. Here, we characterize the microstructure of cellulose fiber-reinforced polypropylene and determined its effect on impact toughness. Fiber lengths were reduced by one-half when compounded in a high-intensity...

Author(s):

Craig Clemons; Daniel Caulfield; A. Jeffrey Giacomin

Year:

2003

Keywords:

Cellulose-fiber reinforced polypropylene, impact toughness, injection molded composites, microstructure, laminates, polypropylene

Source:

Seventh International Conference on Woodfiber-Plastic Composites (and other natural fibers), May 19-20, 2003 ... Madison, Wisconsin, USA. Madison, WI : Forest Products Society, 2003: Pages 119-125

Effect of processing method on accelerated weathering of wood-flour/HDPE composites

Wood-plastic lumber is promoted as a low maintenance high-durability product. When exposed to accelerated weathering, however, wood-plastic composites may experience a color change and/or loss in mechanical properties. Different methods of manufacturing wood-plastic composites lead to different surface characteristics, which can influence weathering, In this study, 50...

Author(s):

Nicole M. Stark; Laurent M. Matuana; Craig M. Clemons

Year:

2003

Keywords:

Woodflour-HDPE composites, weathering, high-density polyethylene composites, extrusion, FTIR, injection molding, mechanical properties, polyethylene

Source:

Seventh International Conference on Woodfiber-Plastic Composites (and other natural fibers), May 19-20, 2003 ... Madison, Wisconsin, USA. Madison, WI : Forest Products Society, 2003: Pages 79-87

Biological resistance of polyethylene composites made with chemically modified fiber or flour

The role of moisture in the biological decay of wood-plastic composites was investigated. Southern pine wood fiber and ponderosa pine wood flour were chemically modified using either acetic anhydride (AA), butylene oxide (BO), or propylene oxide (PO). A 50:50 mixture of high density polyethylene and either chemically modified fiber or flour, or untreated fiber or flour...

Author(s):

Rebecca E. Ibach; Craig M. Clemons

Year:

2002

Keywords:

Composites, polyethylene, chemical modification, acetic anhydride, butylene oxide, propylene oxide, equilibrium moisture content, decay, mechanical properties, biodegradation, wood plastic composites, wood-decaying fungi, moisture content, wood flour, wood fibers, ponderosa pine, southern pine, Gloeophyllum trabeum

Source:

Proceedings of the 6th Pacific Rim Bio-Based Composites Symposium & Workshop on the Chemical Modification of Cellulosics, Portland, Oregon, USA, 2002: pages 574-584.

Effect of acetylated wood flour or coupling agent on moisture, UV, and biological resistance of extruded woodfiber-plastic composites

Although moisture sorption in woodfiber-thermoplastic composites (WPCs) is slower than in unmodified solid wood, it still affects strength and ultimately results in decay of the material in moist outdoor exposure conditions. Chemical modification of the hydroxyl groups of wood with acetic anhydride esterifies the hydroxyl making the wood more hydrophobic and...

Author(s):

Rebecca E. Ibach; Craig M. Clemons

Year:

2006

Keywords:

Composite materials, mechanical properties, extrusion process, plastics, extrusion, ultraviolet radiation, biodegradation, moisture, acetylation, wood flour, thermoplastic composites, wood-plastic composites, deterioration, polyethylene, hydroxyl group, weathering, acetic anhydride, moisture content, resistance to decay, coupling agents, acetylated wood, wood-plastic materials, chemical modification of wood

Source:

Wood protection 2006 : March 21-23, 2006 ... New Orleans, Louisiana, USA. Madison, WI : Forest Products Society, 2006: Pages 139-147

Using climate-FVS to project landscape-level forest carbon stores for 100 years from field and LiDAR measures of initial conditions

Forest resources supply a wide range of environmental services like mitigation of increasing levels of atmospheric carbon dioxide (CO2). As climate is changing, forest managers have added pressure to obtain forest resources by following stand management alternatives that are biologically sustainable and economically profitable. The goal of this study is to project the...

Author(s):

Fabian B. Galvez; Andrew T. Hudak; John C. Byrne; Nicholas L. Crookston; Robert F. Keefe

Year:

2014

Keywords:

carbon sequestration, climate change, forest vegetation simulator, general circulation model, growth and yield, LiDAR

Source:

Carbon Balance and Management. 9:1.

Young adult conservation jobs and worker health

Decades of research studies demonstrate links between healthy environment, healthy lifestyles, and healthy people. This study evaluated the correlations between young adult conservation workers? perceived stress, personal effectiveness, and nature experience using quantitative and qualitative social science methods. The study cohort numbered nearly 300 individuals...

Author(s):

Kathleen L. Wolf; Elizabeth Housley

Year:

2017

Keywords:

Human health, restoration, social science, stress reduction, urban forestry.

Source:

Journal of Environmental Planning and Management. 60(10): 1853-1870.

Combined ultraviolet and water exposure as a preconditioning method in laboratory fungal durability testing

During outdoor exposure, woodfiber-plastic composites (WPC) are subject to biological, moisture, and ultraviolet (UV) degradation. The purpose of laboratory evaluations is to simulate outdoor conditions and accelerate the testing for quicker results. Traditionally, biological, moisture, and W laboratory tests are done separately, and only combined in outdoor field...

Author(s):

Rebecca E. Ibach; Craig M. Clemons; Nicole M. Stark

Year:

2003

Keywords:

Woodfiber-plastic composites, fungal decay, ultraviolet exposure, water exposure, durability

Source:

Seventh International Conference on Woodfiber-Plastic Composites (and other natural fibers), May 19-20, 2003 ... Madison, Wisconsin, USA. Madison, WI : Forest Products Society, 2003: Pages 61-67

Cicada emergence in southwestern riparian forest: Influences of wildfire and vegetation composition

Annually emerging cicadas are a numerically and ecologically dominant species in Southwestern riparian forests. Humans have altered disturbance regimes that structure these forests such that floods are less common and wildfires occur more frequently than was historically the case. Impacts of these changes on primary consumers such as riparian cicadas are unknown....

Author(s):

D. Max Smith; Jeffrey Kelly; Deborah M. Finch

Year:

2006

Keywords:

Akaike's Information Criterion, annual cicada emergence, Middle Rio Grande, riparian vegetation, Tibicen dealbatus, vegetation structure, wildfire

Source:

Ecological Applications. 16(4): 1608-1618.

Using Landsat-derived disturbance history (1972-2010) to predict current forest structure

Lidar is currently the most accurate method for remote estimation of forest structure, but it has limited spatial and temporal coverage. Conversely, Landsat data are more widely available, but exhibit a weaker relationship with structure under medium to high leaf area conditions. One potentially valuable means of enhancing the relationship between Landsat reflectance...

Author(s):

Dirk Pflugmacher; Warren B. Cohen; Robert E. Kennedy

Year:

2012

Keywords:

Landsat, time series, forest disturbance, biomass, carbon, lidar, MSS, tasseled cap, LandTrendr, TimeSync

Source:

Remote Sensing of Environment. 122: 146-165

Landsat time series and lidar as predictors of live and dead basal area across five bark beetle-affected forests

Bark beetle-caused tree mortality affects important forest ecosystem processes. Remote sensing methodologies that quantify live and dead basal area (BA) in bark beetle-affected forests can provide valuable information to forest managers and researchers. We compared the utility of light detection and ranging (lidar) and the Landsat-based detection of trends in...

Author(s):

Benjamin C. Bright; Andrew T. Hudak; Robert E. Kennedy; Arjan J. H. Meddens

Year:

2014

Keywords:

forestry, image sequence analysis, remote sensing, vegetation mapping

Source:

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing. 7(8): 3440-3452.

Shrub succession on eight mixed-severity wildfires in western Montana, northeastern Oregon, and northern Idaho

The response of 28 shrub species to wildfire burn severity was assessed for 8 wildfires on 6 national forests in the northern Rocky Mountains, USA. Stratified random sampling was used to choose 224 stands based on burn severity, habitat type series, slope steepness, stand height, and stand density, which resulted in 896 plots measured at approximately 2-year intervals...

Author(s):

Dennis E. Ferguson; John C. Byrne

Year:

2016

Keywords:

forest succession, wildfire burn severity, Acer glabrum, Rocky Mountain maple, Alnus viridis ssp. sinuata (= A. sinuata), Sitka alder, Amelanchier alnifolia, Saskatoon serviceberry, Arctostaphylos uva-ursi, kinnikinnick, Berberis spp., Oregon grape, Ceanothus sanguineus, redstem ceanothus, Ceanothus velutinus, snowbrush ceanothus, Chimaphila umbellata, pipsissewa, Ericameria nauseosa (= Chrysothamnus nauseosus), rubber rabbitbrush, Holodiscus discolor, oceanspray, Linnaea borealis, twinflower, Lonicera utahensis, Utah honeysuckle, Menziesia ferruginea, rusty menziesia, Paxistima myrsinites (= Pachistima myrsinites), Oregon boxleaf, Physocarpus malvaceus, mallow ninebark, Ribes cereum, wax currant, Ribes lacustre, prickly currant, Ribes viscosissimum, sticky currant, Rosa spp., rose, Rubus parviflorus, thimbleberry, Salix spp., willow, Sambucus racemosa, red elderberry, Shepherdia canadensis, russet buffaloberry, Sorbus scopulina, Greene’s mountain ash, Spiraea betulifolia, white spirea, Symphoricarpos albus, common snowberry, Vaccinium membranaceum (= V. globulare), thinleaf huckleberry, Vaccinium scoparium, grouse whortleberry

Source:

Res. Pap. RMRS-RP-106. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 81 p.

Prediction of forest canopy and surface fuels from lidar and satellite time series data in a bark beetle-affected forest

Wildfire behavior depends on the type, quantity, and condition of fuels, and the effect that bark beetle outbreaks have on fuels is a topic of current research and debate. Remote sensing can provide estimates of fuels across landscapes, although few studies have estimated surface fuels from remote sensing data. Here we predicted and mapped field-measured canopy and...

Author(s):

Benjamin C. Bright; Andrew T. Hudak; Arjan J. H. Meddens; Todd J. Hawbaker; Jennifer S. Briggs; Robert E. Kennedy

Year:

2017

Keywords:

canopy fuel, surface fuel, remote sensing, lidar, Landsat, time series analysis, bark beetle

Source:

Forests: 8(9): 322.

Mapping change of older forest with nearest-neighbor imputation and Landsat time-series

The Northwest Forest Plan (NWFP), which aims to conserve late-successional and old-growth forests (older forests) and associated species, established new policies on federal lands in the Pacific Northwest USA. As part of monitoring for the NWFP, we tested nearest-neighbor imputation for mapping change in older forest, defined by threshold values for forest attributes...

Author(s):

Janet L. Ohmann; Matthew J. Gregory; Heather M. Roberts; Warren B. Cohen; Robert E. Kennedy; Zhiqiang Yang

Year:

2012

Keywords:

gradient nearest neighbor, gradient analysis, old growth, Northwest Forest Plan, landsat change detection, forest monitoring

Source:

Forest Ecology and Management. 272: 13-25

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Susceptibility of forests in the northeastern USA to nitrogen and sulfur deposition: critical load exceedance and forest health

Post-wildfire recovery of riparian vegetation during a period of water scarcity in the southwestern USA

Assessing the carbon consequences of western juniper (Juniperus occidentalis) encroachment across Oregon, USA

Climate warming, reduced snow, and freezing injury could explain the demise of yellow-cedar in southeast Alaska, USA

Response of ponderosa pine stands to pre-commercial thinning on Nez Perce and Spokane Tribal forests in the Inland Northwest, USA

Spatiotemporal dynamics of recent mountain pine beetle and western spruce budworm outbreaks across the Pacific Northwest Region, USA

Does burn severity affect plant community diversity and composition in mixed conifer forests of the United States Intermountain West one decade post fire?

Impact toughness of cellulose-fiber reinforced polypropylene : influence of microstructure in laminates and injection molded composites

Effect of processing method on accelerated weathering of wood-flour/HDPE composites

Biological resistance of polyethylene composites made with chemically modified fiber or flour

Effect of acetylated wood flour or coupling agent on moisture, UV, and biological resistance of extruded woodfiber-plastic composites

Using climate-FVS to project landscape-level forest carbon stores for 100 years from field and LiDAR measures of initial conditions

Young adult conservation jobs and worker health

Combined ultraviolet and water exposure as a preconditioning method in laboratory fungal durability testing

Cicada emergence in southwestern riparian forest: Influences of wildfire and vegetation composition

Using Landsat-derived disturbance history (1972-2010) to predict current forest structure

Landsat time series and lidar as predictors of live and dead basal area across five bark beetle-affected forests

Shrub succession on eight mixed-severity wildfires in western Montana, northeastern Oregon, and northern Idaho

Prediction of forest canopy and surface fuels from lidar and satellite time series data in a bark beetle-affected forest

Mapping change of older forest with nearest-neighbor imputation and Landsat time-series

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