Index Catalog // ScholarsArchive@OSU

Analysis of potential impacts of climate change on forests of the United States Pacific Northwest

Creator:: Latta, Gregory, Temesgen, Hailemariam, Adams, Darius M., and Barrett, Tara
Abstract:: As global climate changes over the next century, forest productivity is expected to change as well. Using PRISM climate and productivity data measured on a grid of 3356 plots, we developed a simultaneous autoregressive (SAR) model to estimate the impacts of climate change on potential productivity of Pacific Northwest (PNW)...
Resource Type:: Article
Full Text:: FORECO-11838; No of Pages 10 Analysis of potential impacts of climate change on forests of the United

Regeneration imputation models for complex stands of southeastern British Columbia

Creator:: Hassani, Badre T., LeMay, Valerie, Marshall, Peter L., Temesgen, Hailemariam, and Zumrawi, Abdel-Azim
Abstract:: Two imputation techniques for predicting natural regeneration in complex stands prevalent in southeastern British Columbia (BC) were compared using data from the Interior Cedar-Hemlock moist warm subzone variant 2 (ICHmw2) in the vicinity of Nelson, BC. Imputation approaches offer advantages over other modeling approaches in that they provide estimates of...
Resource Type:: Article
Full Text:: MARCH/APRIL 2004, VOL. 80, NO. 2, THE FORESTRY CHRONICLE 271

Evaluation of mixed-effects models for predicting Douglas-fir mortality

Creator:: Groom, Jeremiah D., Hann, David W., and Temesgen, Hailemariam
Abstract:: We examined the performance of several generalized linear fixed- and mixed-effects individual-tree mortality models for Douglas-fir stands in the Pacific Northwest. The mixed-effects models accounted for sampling and study design overdispersion. Inclusion of a random intercept term reduced model bias by 88% relative to the fixed-effects model; however, model discrimination...
Resource Type:: Article
Full Text:: . Taken 154 together, our goal is to examine how well models met our objectives and whether we produce a

Estimating Current Forest Attributes from Paneled Inventory Data Using Plot-Level Imputation: A Study from the Pacific Northwest

Creator:: Eskelson, Bianca N.I., Temesgen, Hailemariam, and Barrett, Tara M.
Abstract:: Information on current forest condition is essential to assess and characterize resources and to support resource management and policy decisions. The 1998 Farm Bill mandates the US Forest Service to conduct annual inventories to provide annual updates of each state's forest. In annual inventories, the sample size of I year...
Resource Type:: Article
Full Text:: , and P3 lack data for the national forests Rogue River, Coleville, and Winema, respectively, because no

Imputing Mean Annual Change to Estimate Current Forest Attributes

Creator:: Eskelson, Bianca N.I., Barrett, Tara M., and Temesgen, Hailemariam
Abstract:: When a temporal trend in forest conditions is present, standard estimates from paneled forest inventories can be biased. Thus methods that use more recent remote sensing data to improve estimates are desired. Paneled inventory data from national forests in Oregon and Washington, U.S.A., were used to explore three nearest neighbor...
Resource Type:: Article
Full Text:: to panel 4 (P4; 154 PSUs) and the remaining 75% of the PSUs (464 PSUs) to panel 1 (P1), panel 2 (P2

Accuracy and suitability of selected sampling methods within conifer dominated riparian zones

Creator:: Marquardt, Theresa, Temesgen, Hailemariam, and Anderson, Paul D.
Abstract:: Sixteen sampling alternatives were examined for their performance to quantify selected attributes of overstory conifers in riparian areas of western Oregon. Each alternative was examined at eight headwater forest locations based on a 0.52 ha square stem maps. The alternatives were evaluated for selected stand attributes (trees per hectare, basal...
Resource Type:: Article
Full Text:: ). This is no different in the Pacific Northwest (Acker et al., 2003). Horizontal and vertical structure

Sources of Variation in the Self-Thinning Boundary Line for Three Species with Varying Levels of Shade Tolerance

Creator:: Weiskittel, Aaron, Gould, Peter, and Temesgen, Hailemariam
Abstract:: The species self-thinning boundary line has been widely analyzed with a variety of statistical techniques. Most previous studies in the forestry literature have reported that the relationship does not differ across a range of stand and site factors, but these studies have primarily used statistical techniques that make model fitting...
Resource Type:: Article
Full Text:: stand origin (natural or plantation) showed no distinct trends (Hann et al. 2003). In addition, Hann et

Geostatistical modeling of riparian forest microclimate and its implications for sampling

Creator:: Eskelson, Bianca N.I., Anderson, Paul D., Hagar, Joan C., and Temesgen, Hailemariam
Abstract:: Les modèles de prédiction du microclimat pour différentes conditions de station dans les zones riveraines boisées des cours d’eau de tête de bassin sont peu développés et les procédures d’échantillonnage pour caractériser les gradients sous-jacents du microclimat riverain sont rares. Nous avons utilisé des données de microclimat riverain collectées le...
Resource Type:: Article
Full Text:: arbitrary, fixed point. OK worked well when no obvious trend of Tair existed (e.g., KM17), so that the use

Estimating Cavity Tree Abundance Using Nearest Neighbor Imputation Methods for Western Oregon and Washington Forests

Creator:: Temesgen, Hailemariam, Barrett, Tara M., and Latta, Greg
Abstract:: Cavity trees contribute to diverse forest structure and wildlife habitat. For a given stand, the size and density of cavity trees indicate its diversity, complexity, and suitability for wildlife habitat. Size and density of cavity trees vary with stand age, density, and structure. Using Forest Inventory and Analysis (FIA) data...
Resource Type:: Article
Full Text:: likelihood methods, no single dominant data structure (e.g. normality) is assumed or required; and these

Forest Measurement and Biometrics in Forest Management: Status and Future Needs of the Pacific Northwest USA

Creator:: Temesgen, Hailemariam, Goerndt, Michael E., Johnson, Greg P., Adams, Darius M., and Monserud, Robert A.
Abstract:: Forest measurement and biometrics (FMB) programs have been at the heart of forestry education in North America since its beginnings at the Biltmore Forest School more than 100 years ago. Over the intervening period, the field of forestry has changed in critical ways. There are many forest management and policy...
Resource Type:: Article
Full Text:: interpolation. These are methods by which landscape and topo- graphical data can be estimated in areas where no

ScholarsArchive@OSU

Analysis of potential impacts of climate change on forests of the United States Pacific Northwest

Regeneration imputation models for complex stands of southeastern British Columbia

Evaluation of mixed-effects models for predicting Douglas-fir mortality

Estimating Current Forest Attributes from Paneled Inventory Data Using Plot-Level Imputation: A Study from the Pacific Northwest

Imputing Mean Annual Change to Estimate Current Forest Attributes

Accuracy and suitability of selected sampling methods within conifer dominated riparian zones

Sources of Variation in the Self-Thinning Boundary Line for Three Species with Varying Levels of Shade Tolerance

Geostatistical modeling of riparian forest microclimate and its implications for sampling

Estimating Cavity Tree Abundance Using Nearest Neighbor Imputation Methods for Western Oregon and Washington Forests

Forest Measurement and Biometrics in Forest Management: Status and Future Needs of the Pacific Northwest USA

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