Treesearch

There has been an increase in loblolly pine production driven by forest management practices like intensive silviculture and improved genetics. Some reported yield gains have been modeled using metaregression mixed effects models accounting for the potential contribution of the four factors related to forest growth: age, site quality (environment), establishment culture and management, and stand intrinsic characteristics (genetics and initial planting density). The aim of this research was to describe a methodology that allows for the derivation of response equations from yield models for...

This study synthesizes published height growth measurements for a range of bottomland hardwood species commonly used in afforestation efforts in the Lower Mississippi Alluvial Valley (LMAV), including a variety of oak and non-oak species, from establishment up to 20–30 years of age. Over this time period, cottonwood outperforms all species, while red oaks (cherrybark, Nuttall, water, and willow), sweetgum, and sycamore show intermediate growth trends. Green ash and swamp chestnut oak show lower growth over the same period. In terms of site quality effects, heavier textured clay soils tend...

This work was intended originally to be simply a bibliography in which all sources were presented and listed under appropriate subject headings; where disagreements or other circumstances necessitated, works were to be cross-referenced to each other. Recent reviewers have urged a more active authorship in which I evaluated the literature and identified important issues concerning the species. This I have done with some trepidation, but also with enthusiasm. Where my own researches have yielded new ideas or summaries, I present them as well.The work comprises two Parts, (1) an introductory...

This research analyzed two datasets to determine the effects of increased installations of biomass power plants on forest resources with a specific focus on the South, the region in the United States that experienced the largest growth in biomass power capacity using wood solids between 2001 and 2015. Using data from the U.S. Energy Information Administration and the U.S. Department of Agriculture Forest Service, effects on timber harvest and residue production and utilization relative to the increased need for wood fiber from new biomass power plants were assessed. The study found a...

This resource update provides an overview of the forest resources of Oklahoma based on an inventory conducted by the U.S. Forest Service, Forest Inventory and Analysis (FIA) program at the Southern Research Station (SRS), and Oklahoma Forestry Services (OFS). Data collection and estimates are based on the FIA annualized sample design, and are updated yearly, creating a moving average. The 2016 resource update highlights how the moving average has been updated since the 2015 report (Dooley, 2017). The data used in this publication were accessed from the FIA Database between May 1 and June...

Atmospheric deposition of nitrogen (N) influences forest demographics and carbon (C) uptake through multiple mechanisms that vary among tree species. Prior studies have estimated the effects of atmospheric N deposition on temperate forests by leveraging forest inventory measurements across regional gradients in deposition. However, in the United States (U.S.), these previous studies were limited in the number of species and the spatial scale of analysis, and did not include sulfur (S) deposition as a potential covariate. Here, we present a comprehensive analysis of how tree growth and...

Hundreds of plant and fungi species (chapter 2) are harvested each year for nontimber forest products (NTFPs) because they play important roles in the cultural (chapter 4), social (chapter 5), and economic (chapter 6) lives of individuals and communities across the United States. Most of these species are harvested from natural populations, where they play important ecological roles, including providing food, cover, and habitat for diverse wildlife, including pollinators, and contribute to nutrient cycling, hydrological cycles, and erosion control. The continued use of NTFPs is contingent...

Traditional silvicultural systems such as clearcutting and single-tree selection cutting are critiqued for their tendency to simplify forest complexity. By more closely emulating natural disturbance regimes and increasing the availability and heterogeneity in understory light levels, we pose that systems causing intermediate disturbances such as the single-tree and small group selection cutting system can promote tree regeneration, retain stand structural attributes, and maintain high understory plant diversity in temperate mixedwood stands. To assess this, we implemented a harvest...

(1) Background: Climate change may subject forests to climate conditions to which they are not adapted. Elevated temperatures can potentially reduce net photosynthesis by increasing respiration rates and increasingly long droughts dramatically increase morbidity. While CO2 enrichment enhances productivity, it is not clear to what extent CO2 enrichment can offset the negative effects of elevated temperatures and longer droughts; (2) Methods: We used a mechanistic landscape model to conduct controlled simulation experiments manipulating CO2 concentration, temperature, drought length and soil...