Treesearch

This publication is part of a General Technical Report about the Forest Resources of the United States, 2017. It provides forest resource statistics from the U.S. affiliated jurisdictions of the insular Caribbean and Pacific, contributing to the 2020 Resources Planning Act (RPA) Assessment. Resource data about forest area and size trends, land tenure systems, tree species composition and richness, forest volume and carbon dynamics, timber and nontimber forest products, and forest health are discussed for Puerto Rico, the U.S. Virgin Islands, American Samoa, Commonwealth of the Northern...

Red spruce (Picea rubens) ecosystems in the high elevations of the central Appalachians of the eastern United States are the focus of ongoing restoration efforts due to the valuable ecosystem services these forests provide. Recent research has shown that spodic materials still present in the soil represent the pedomemory of the historic extent of red spruce forests in the region. A dataset containing 221 points with varying spodic intensities and 29 environmental variables collected from the Monongahela National Forest in West Virginia, USA, was used to evaluate the utility of a species...

En un momento histórico, en que iniciativas a nivel global se han puesto en marcha para describir los tipos de vegetación existentes alrededor del mundo se celebró el xxi Congreso Latinoamericano de Botánica en la ciudad de Quito, Ecuador del 21 al 28 de octubre de 2018. Este congreso se realiza cada cuatro años en diferentes países de América Latina, el mismo se destaca como el evento más importante de la botánica en dicha región. Más de 600 botánicos del continente americano y otras regiones del mundo se dieron cita para el ofrecimiento de conferencias magistrales, simposios, presentacion...

This manual provides basic information for identifying and evaluating important health problems of eastern white pine in New England. The health problems include: White pine weevil, White pine blister rust, Caliciopsis canker, White pine bast scale, White pine needle damage, Red rot or Red-ring rot. In addition to providing descriptions of symptoms, signs, and risk factors, recommendations for white pine silviculture are described for managing stands for low densities and crop trees.

As a result of the rise of the digital market, social media has emerged as one of the most popular marketing tools. Consumers today increasingly rely on social media when shopping, and thus it can influence consumer behavior and purchasing decisions. Similarly, a growing number of wood products companies are using a variety of social media approaches for their marketing efforts as they seek to remain competitive in the digital marketplace. Although previous studies have examined social media use by wood products companies, none have examined social media use by wood products consumers....

The soilborne oomycete Phytophthora cinnamomi—which causes root rot, trunk cankers, and stem lesions on an estimated 5,000 plant species worldwide—is a lethal pathogen of American chestnut (Castanea dentata) as well as many other woody plant species. P. cinnamomi is particularly damaging to chestnut and chinquapin trees (Castanea spp.) in the southern portion of its native range in the United States due to relatively mild climatic conditions that are conductive to disease development. Introduction of resistant genotypes is the most practical solution for disease management in forests...

This review provides an overview and integration of the use of resilience concepts to guide natural resources management actions. We emphasize ecosystems and landscapes and provide examples of the use of these concepts from empirical research in applied ecology. We begin with a discussion of definitions and concepts of ecological resilience and related terms that are applicable to management. We suggest that a resilience-based framework for management facilitates regional planning by providing the ability to locate management actions where they will have the greatest benefits and determine...

In the last three decades, over 4.1 million hectares have burned in Arizona and New Mexico and the largest fires in documented history have occurred in the past two decades. Changes in burn severity over time, however, have not been well documented in forest and woodland ecosystems in the southwestern US. Using remotely sensed burn severity data from 1621 fires (> 404 ha), we assessed trends from 1984 to 2015 in Arizona and New Mexico in (1) number of fires and total area burned in all vegetation types; (2) area burned, area of high-severity, and percent of high-severity fire in all forest...

This study improved on previous efforts to map longleaf pine (Pinus palustris) over large areas in the southeastern United States of America by developing new methods that integrate forest inventory data, aerial photography and Landsat 8 imagery to model forest characteristics. Spatial, statistical and machine learning algorithms were used to relate United States Forest Service Forest Inventory and Analysis (FIA) field plot data to relatively normalized Landsat 8 imagery based texture. Modeling algorithms employed include softmax neural networks and multiple hurdle models that combine...

Background: Current forests of the eastern USA have the potential to succeed in composition to more shade-tolerant species. However, long-term processes of transition from fire-tolerant tree species to fire-sensitive species and effects of current land use on forests may interfere with successional progression. Methods: I examined if forests in three regions have increased in shade tolerance and if life history strategy groups that represent response to disturbance (i.e., fire-tolerance, early-successional species based on low shade tolerance, mid-successional species, late-successional...