Treesearch

Linking fire behavior and heating to plant responses is needed to generalize fire effects. Temperature recording devices, such as thermocouples and pyrometers, have been deployed in several studies. Use of these relatively unsophisticated devices is likely to continue as spatiotemporally explicit methods for quantifying temperature variability become more accessible. We compared pyrometer and thermocouple device temperatures placed at ground level and 30 cm aboveground to determine pyrometer suitability as a rapid deployment device for capturing variability within and among four burns...

Following decades of fire exclusion, open-canopied, pyrophytic oak (Quercus spp.) and pine (Pinus spp.) landscapes across the central and Eastern United States are shifting to closed-canopied forests with a dense midstory occupied by shade-tolerant, often fire-sensitive species (i.e., mesophytes) (Alexander and others 2021). Encroaching species may create an understory with increased moisture due to lower solar irradiance beneath the canopy (Alexander and others 2021), and increased small leaf litter, which may compact fuel beds and decrease water evaporation (Cornwell and others 2015,...

A system of growth and yield equations is presented for shortleaf pine (Pinus echinata) plantations using data from across the western half of the Southeastern United States. Data used in model fitting were obtained from Arkansas, Mississippi, Oklahoma, and Tennessee (n = 168 plot measurements). Planting densities ranged from 194 to 1,742 seedlings per acre, and measurement ages ranged from 1 to 30 years. The majority of the measurement ages were ≤16 years of age (n = 152). A mix of cutover and old-field sites were modeled. Predictions of dominant height, trees per acre, basal area per...

Implicit in the concepts of growing stock and stand density is that they are functionally related to the number and size of the trees in a stand. If they are additive, they should be a function of the size and number of trees within a stand. To test this idea, data from a slash pine (Pinus elliotii) spacing and thinning study were fit to the nonlinear regression model iv/ih =β0 D0β1 + ϵ where iv=periodic annual increment of stem volume, ih=periodic annual increment of stem height, D0= initial stem diameter at breast height, and β0 and β1are parameters to be estimated. Previous research...

Dynamic prices and markets create value for contractors who can readily evaluate the gross and net income differences for alternative merchandizing systems. The majority of the southern U.S.A. relies on tree-length merchandizing, with occasional identification and merchandizing of logs for a specific market or specific tree dimensions or qualities. Cut-to-length (CTL) merchandizing has generated more value when compared to tree-length (TL) marketing, but these comparisons have been limited to specific stands and markets (specifications and prices). The study objective was to demonstrate a...

The main purpose of this study is to quantify and compare the embodied carbon (EC) from the materials used or designed to build the Adohi Hall, a residence building located on the University of Arkansas campus in Fayetteville, AR. It has been constructed as a mass timber structure. It is compared to the same building design with a steel frame for this study. Based on the defined goal and scope of the project, all materials used in the building structure are compared for their global warming potential (GWP) impact by applying a life cycle assessment (LCA) using a cradle-to-construction site...

LANDFIRE (LF) has been producing periodic spatially explicit vegetation change maps (i.e., LF disturbance products) across the entire United States since 1999 at a 30 m spatial resolution. These disturbance products include data products produced by various fire programs, field-mapped vegetation and fuel treatment activity (i.e., events) submissions from various agencies, and disturbances detected by the U.S. Geological Survey Earth Resources Observation and Science (EROS)-based Remote Sensing of Landscape Change (RSLC) process. The RSLC process applies a bi-temporal change detection...

Evaluation of physical and mechanical heterogeneity in commercial paperboards is needed to promote their use in structural applications, especially within the field of packaging. Understanding the range of their behaviors is needed to compete with other materials in the current marketplace and expand in others. This work describes the physical and stiffness heterogeneities of twelve commercial materials using tensile tests in the cross-machine direction and several inverse analyses. The effects of grammage, thickness, and apparent density on tensile stiffness were evaluated in both the...

Atanycolus yangi sp. nov. (Hymenoptera, Braconidae), a new species parasitizing the flatheaded wood borer, Lamprodila nobilissima bellula (Lewis) (Coleoptera: Buprestidae), is described. Lamprodila nobilissima bellula is a serious wood boring pest of Rosacea trees in North China. We collected adult specimens of A. yangi sp. nov. searching for hosts on infested tree trunks and confirmed the host-parasitoid association by dissecting parasitized hosts from infested trees in the field and rearing the parasitoid from L. nobilissima bellula-infested host tree logs in the laboratory. Adult images...

Both elevated temperature and reduced precipitation have been related to growth declines in Douglas-fir (Pseudotsuga menziesii) in the northwest U.S. However, the impact of high vapor pressure deficit (VPD) on Douglas-fir growth and physiological stress is not fully understood. We investigated how inter- and intra-annual rainfall and VPD correlated to the radial growth and carbon isotope signature (δ13C) of latewood for ~ 50-year-old Douglas-fir trees in the western Cascade Mountains in Oregon. Latewood δ13C reflects variation in stomatal restriction of photosynthetic gas exchange and,...