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Showing 1 to 20 of 51 for “"site index"”.

  1. An examination of methods for localizing site index equations

    Walters, David K.Virginia Polytechnic Institute and State University1987

    Equations for modeling the height-age pattern of forest trees or stands are typically developed for a given species in a specified region. In order to adequately model height-age patterns, the resulting equations are often quite complex. This study addresses the question of how to increase the …

    vt Repository record

  2. Loblolly pine site index curves constructed from age-height data

    Oderwald, Richard G.Virginia Polytechnic Institute and State University1972

    Site index curves for natural stands and plantation stands of loblolly pine in the Southeast were constructed from temporary age height data by an anamorphic technique and two polymorphic techniques. These different systems of site index curves were evaluated using sectioned tree data. Evaluation …

    vt Repository record

  3. Estimating Site Productivity from Non-Site Trees: A Site Index Based Approach

    Vopicka, Charles Edward

    Site index (SI) is an indirect measure of potential site quality that is widely used in the Inland Northwest. However, a serious problem exists in applying site curves in the Inland Northwest due to a shortage of suitable 'site' trees. Site trees are explicitly defined for any given set of site …

    montana-tech Repository record

  4. Estimating Site Productivity from Non-Site Trees: A Site Index Based Approach

    Vopicka, Charles Edward

    Site index (SI) is an indirect measure of potential site quality that is widely used in the Inland Northwest. However, a serious problem exists in applying site curves in the Inland Northwest due to a shortage of suitable 'site' trees. Site trees are explicitly defined for any given set of site …

    montana Repository record

  5. A NEW SITE INDEX MODEL FOR INTENSIVELY MANAGED LOBLOLLY PINE (Pinus taeda) PLANTATIONS IN THE WEST GULF COASTAL PLAIN

    Reed Trim, Kynda2018

    … prescriptions to maintain or improve the site quality of plantations and natural forests. Choosing the most appropriate silvicultural prescriptions can further increase the site quality of plantations or natural forests. The quality of a forest site can be estimated by several means, …

    sfasu Repository record

  6. Development and testing of climate-sensitive site index models for long rotation Eucalyptus grandis in Limpopo province of South Africa

    Venter, KunoStellenbosch : Stellenbosch University2026

    … Accurate prediction of height growth and site productivity in Eucalyptus grandis plantations has become increasingly important as the forestry sector faces rising climatic variability and long-term shifts in temperature and rainfall regimes. Although numerous growth and yield studies exist …

    stellenbosch Repository record

  7. Ecological site quality, site index, and height growth of white spruce stands in the sub-boreal spruce zone of British Columbia

    Wang, Gaofeng G.University of British Columbia1993

    … to quantify the relationship between ecological site quality and white spruce [Picea glauca (Moench) Voss] height growth, vegetation, soil, foliar nutrient, and stem analysis data were obtained from 102 white spruce-dominated stands across a wide range of sites throughout the Sub-Boreal Spruce …

    ubc Repository record

  8. Modeling growth dynamics of juvenile loblolly pine plantations

    Avila, Olga B.Virginia Tech1993

    … as functions of independent variables such as site index, relative spacing and age for trees younger than ten years old. It was found that height prediction for trees one and two years old was a function of the products of the variables site index and age (or square root of age) and relative …

    vt Repository record

  9. Economics of Managing Loblolly Pine Plantations for Increased Wildlife Biodiversity

    Griffith, Melissa2023

    … and intensities, prescribed burn intervals, and site indices. Economic analyses used to evaluate management regimes over a range of nonindustrial private landowner (NIPF) alternative rates of return (ARRs) and site indexes were net present worth, land expectation value, and equal annual annuity. …

    sfasu Repository record

  10. Growth and nutrient relations in black cottonwood in South-Coastal British Columbia

    McLennan, Donald S.University of British Columbia1993

    Initially, the study examined within and among site temporal and spatial variation of foliar nutrients, and spatial variation of soil nutrients to assess the sampling methods employed, and to provide background for the interpretation of nutrient-site index interactions. The study then examined …

    ubc Repository record

  11. Assessing age-height relationship using ICESat-2 and Landsat time series products of southern pines in southeastern region

    Sharma Banjade, SoniaVirginia Tech2023

    … the impact of management on productivity and site index. This research involved the analysis of over 137,998 ICESat-2 ATL08 segments in actively managed pine stands in the U.S. Southeast. We compared a subset of ICESat-2 heights with heights derived from airborne laser scanning acquisitions …

    vt Repository record

  12. THE INFLUENCE OF ENVIRONMENTAL VARIABLES ON THE HEIGHT GROWTH OF LOBLOLLY PINE (Pinus taeda) IN THE WESTERN GULF

    Edo-Iyasere, Osakpamwan2020

    … soil and climate factors on the height growth (site index) of loblolly pine (<em>Pinus Taeda L.</em>) using data collected from permanent plots established in intensively-managed plantations across East Texas and Western Louisiana. The Chapman-Richards model was selected as the base model to …

    sfasu Repository record

  13. Basal Area Growth and Crown Dynamics in a Loblolly Pine Spacing Trial

    Radtke, Philip J.Virginia Tech1996

    … inversely related to both planting density and site index. Crown closure was advanced on sites of relatively high quality, exhibiting an approximately linear increase with time from planting until the age of basal area culmination. The slope of this trend increased with planting density. The …

    vt Repository record

  14. Improving Site Quality Estimates in the Upland Hardwood Forests of the Southern Appalachians with Environmental and Spatial Modeling

    Cotton, Claudia AnnVirginia Tech2010

    … are needed based on the characteristics of the site to quantify the site quality where no accurate maps of site quality exist. Three studies were conducted to achieve this objective. The first study tested if independent measures of forest productivity, based on vegetation and environment, in a …

    vt Repository record

  15. Large-area forest assessment and monitoring using disparate lidar datasets

    Gopalakrishnan, RanjithVirginia Tech2017

    … stand-age maps to predict plantation pine site index over large areas (site index is a measure of forest productivity). The model performance was assessed using a Monte Carlo technique (RMSE = 3.8 meters, relative RMSE = 19%). A sample site index map for large areas of Virginia and South …

    vt Repository record

  16. Development of national extent terrain attributes (TANZ), soil water balance surfaces (SWatBal), and environmental surfaces, and their application for spatial modelling of Pinus radiata productivity across New Zealand

    Palmer, David JohnUniversity of Waikato2008

    … may become increasingly desirable because these sites require lower capital outlay. In this research, a series of spatial surfaces potentially useful in the modelling and mapping of forest productivity across the national extent of New Zealand have been developed. Modelled surfaces include 15 …

    waikato-masters Repository record

  17. Incorporating Climate Sensitivity for Eastern United States Tree Species into the Forest Vegetation Simulator

    Jiang, HuiquanVirginia Tech2015

    … Development of climate- sensitive models for site index, individual-tree mortality and diameter increment were addressed separately, which were all developed using Random Forests on the basis of USDA Forest Service Forest Inventory and Analysis program linked to contemporary climate data and …

    vt Repository record

  18. Determination of fertility rating (FR) in the 3-PG model for loblolly pine (Pinus taeda L.) plantations in the southeastern United States

    Subedi, SantoshVirginia Tech2015

    … was constructed using the relationship between site index and aboveground productivity. Geocentric models used physical and chemical properties of the A-horizon. Soil geocentric models were constructed using two modeling approaches. In the first approach, ordinary least squares methods of …

    vt Repository record

  19. Uncertainty in Ecological Simulation Modeling: Applications to Conservation of Endangered Species and Forest Growth

    Parysow, Pablo FabianUniversity of Illinois at Urbana-Champaign2015

    … of the effect of acidic deposition on the site index of a red pine stand is employed to illustrate this methodology. It is argued that these are valuable methods for conducting process model-based experiments.

    uiuc Repository record

  20. Soil Morphological, Physical, and Chemical Parameters Affecting Longleaf Pine (Pinus palustris) Site Quality and Ecosystem Restoration Potential in East Texas

    Svehla, Ryan, Farrish, Kenneth W2017

    … the re-establishment of this species on suitable sites. However, many attempts have been unsuccessful in re-establishment, likely in part due to the lack of emphasis on selection of suitable soils. Historically, longleaf pine was found on soils with a wide range of soil properties, including …

    sfasu Repository record

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