Treesearch

This fully bilingual revised and expanded edition of the 2011 publication, Identification of Central American Woods, will serve as a field manual for the identification of the common commercial timbers of Central America, Mexico, and the Caribbean. It is intended as a tool for customs inspectors and other officials to control and regulate the flow of timber and wood products into and out of their countries and can be used as an academic reference to train wood anatomists.

The U.S. Department of Agriculture’s Forest Service manages more than 779,000 km2 (193 million acres) of national forests and grasslands (collectively, National Forest System [NFS] lands) that play a significant role in providing clean, fresh water for local ecosystems and economies. This water is sometimes transferred hundreds of kilometers away to also serve big cities through inter-basin transfers (IBTs). The contribution of NFS lands to surface drinking water supplies for public water systems has not been assessed at the national scale while accounting for IBTs. The Forest Service...

The emerald ash borer (EAB), Agrilus planipennis Fairmaire (Coleoptera: Buprestidae), a wood-boring beetle native to Asia, is the most damaging invasive forest insect pest to have invaded North America (Herms and McCullough 2014). It was likely introduced in the mid-1990s (Siegert et al. 2014), but was not discovered until 2002 near Detroit, Michigan (Haack et al. 2002; Poland and McCullough 2006). In EAB’s native range in far eastern Russia, northern China, Japan, and Korea, it is generally only a pest of non-native ash or indigenous ash species (Fraxinus spp.) that are stressed by other...

Nonresponse in national forest inventories primarily occurs in forested areas due to accessibility issues or where hazardous conditions exist. As with all surveys, nonresponse has the potential to impart empirical bias into sample-based estimates and care should be taken to minimize any effects. A less-studied aspect is the effects of nonresponse when estimating change between two points in time. In this study, potential bias in change estimates was evaluated using imputed values for nonresponse inventory plots to compare differences between response and nonresponse means. Analysis of...

This report provides detailed estimates and highlights key findings from Forest Inventory and Analysis (FIA) data collected across the Tanana unit in interior Alaska, 2014–2018. The Tanana unit encompasses much of the Tanana River basin and is one of six inventory units distributed throughout the expansive boreal forest that comprises much of Alaska. Estimates of forest area, volume, aboveground biomass, and ecosystem carbon are provided across land ownerships, forest types, and forest demographics throughout the unit. The Tanana unit covers approximately 33.4 million ac, of which 20.8...

Nickel (Ni)-lignin nanocomposites were synthesized from nickel nitrate and kraft lignin then catalytically graphitized to few-layer graphene-encapsulated nickel nanoparticles (Ni@G). Ni@G nanoparticles were used for catalytic decomposition of methane (CDM) to produce COx-free hydrogen and graphene nanoplatelets. Ni@G showed high catalytic activity for methane decomposition at temperatures of 800 to 900 °C and exhibited long-term stability of 600 min time-on-stream (TOS) without apparent deactivation. The catalytic stability may be attributed to the nickel dispersion in the Ni@G sample....

In this work, few-layer graphene materials were produced from Fe-lignin nanocomposites through a molecular cracking and welding (MCW) method. MCW process is a low-cost, scalable technique to fabricate few-layer graphene materials. It involves preparing metal (M)-lignin nanocomposites from kraft lignin and a transition metal catalyst, pretreating the M-lignin composites, and forming of the graphene-encapsulated metal structures by catalytic graphitization the M-lignin composites. Then, these graphene-encapsulated metal structures are opened by the molecule cracking reagents. The graphene...

Oaks (Quercus spp.) are foundational species in forests and woodlands in the eastern USA. An oak regeneration bottleneck has occurred throughout its range in recent decades, and refining silvicultural treatments to localized conditions has become a focus in addressing this problem. This study was developed to determine species regeneration dynamics among oak and oak competitors on productive sites in response to silvicultural treatments in oak-dominated southern Appalachian mountain forests. The treatments were: an oak shelterwood treatment (25–30% basal area [BA]) reduction through...

The United States of America has a remarkable forest resource—more than 765 million acres of planted and natural forest land and an additional 58 million acres of woodlands. These lands provide clean water, clean air, wildlife and fish habitat, recreational opportunities, and for nearly four centuries have been the foundation for economic development. This atlas introduces the reader to a trove of information also available online at the forest atlas website, https://forest-atlas.fs.usda.gov.Evolving from the first inventory of U.S. forests in the 1870s, the Forest Inventory and Analysis...

Este documento fue elaborado por el Instituto de Ciencias Climáticas Aplicadas del Norte en colaboración con el Centro Climático de Bosques del Norte del Departamento de Agricultura de los Estados Unidos de Norteamérica. La Guía rápida se desarrolló como punto de acceso para la planificación a la adaptación al cambio climático para profesionales de recursos naturales. Es paralela a una guía de adaptación desarrollada específicamente para fideicomisos de tierras en colaboración con “Land Trust Alliance”, Guía rápida de planificación a la adaptación para fideicomisos de tierras, pero se...