Treesearch

In the eastern United States, feeding by introduced predators Laricobius nigrinus Fender and Laricobius osakensis Shiyake and Montgomery are likely insufficient to sustainably regulate the invasive hemlock woolly adelgid (HWA), Adelges tsugae Annand, due to adelgid population rebound postpredation. This suggests that additional predators may be needed in eastern North America to achieve effective biological control. In the Pacific Northwest, there is evidence that multiple specialist predators, including La. nigrinus, Leucotaraxis piniperda (Malloch), and Le. argenticollis (Zetterstedt)...

This resource bulletin describes the principal findings of the 2019 forest inventory of Oklahoma (conducted January 13, 2010 to July 6, 2021)—the first report on a complete, annualized inventory of central and western Oklahoma, and changes since the previous report, Oklahoma’s Forests, 2014. The survey finds nearly 12 million acres in Oklahoma are forest land, mostly in private ownership. These forest lands contain more than 5 billion trees, 10 billion cubic feet of wood, and 250 million short tons of biomass. Net change in volume was positive, with an increase of 93.9 million cubic feet.

Traditional empirical fire danger rating systems are largely based on generalized historical weather-fire relationships. By contrast, fire behavior models incorporate interactions among weather, fuels and topography to simulate fire spread across landscapes, offering opportunities for wildfire danger evaluation.This study is to develop a novel Wildfire Danger Assessment and Forecast (WDAF) framework that estimates daily fire spread potential using spatially explicit fire simulations.The framework integrates weather, fuel and topographic data into a fire behavior model to simulate daily...

This report provides detailed estimates and highlights key findings from Forest Inventory and Analysis data collected across the State of Mississippi from 2017 to 2023; a remeasurement of plots sampled between 2006 and 2017. Estimates of forest area, volume, biomass, and timber product output are provided across land ownerships, forest types, and forest demographics throughout the State. Mississippi covers approximately 31 million acres, 19.2 million acres (62 percent) of which is considered forest land. This report evaluates trends in land-use change as well as current forest land...

The invasive hemlock woolly adelgid (Adelges tsugae Annand) continues to threaten the survival of eastern hemlock (Tsuga canadensis (L.) Carr.) and Carolina hemlock (Tsuga caroliniana Engelm.) in eastern North America. Effective restoration efforts will require an integrated understanding of how these species respond to management interventions under current environmental pressures. This study examined the early growth, survival, and pest resilience of eastern and Carolina hemlock seedlings planted under varying competition control, insecticide treatment, and light availability regimes....

Laurel wilt is a vascular disease caused by a non‐native pathogen ( Harringtonia lauricola ) and an associated beetle vector (redbay ambrosia beetle; RAB; Xyleborus glabratus ) affecting several members of the Lauraceae family in North America, including the ecologically and culturally important sassafras ( Sassafras albidum ). Since discovery of the vector in 2002 and the disease in 2004 near Savannah, GA, laurel wilt has spread widely throughout the eastern United States, causing widespread mortality to redbay, sassafras, and other lauraceous species. The objective of this study was to...

Biochar, a carbon-rich material that can be produced from forest byproducts and waste, is emerging as a valuable material for removing heavy metal ions from aqueous solutions. Biochar can be produced by many processes and equipment. Among these, mobile air curtain burners, developed to achieve lower levels of particulate matter and smoke than open pile burning, can be deployed in the field where biomass feedstocks are located. To elucidate lead metal ion (Pb2+) removal mechanisms, this study characterized seven biochars generated by a novel mobile curtain burner, representing the first...

Evapotranspiration (ET), the core of ecohydrology, represents a major component of an ecosystem’s water and energy budget, reflecting multiple biophysical processes in the Earth system. This flux represents the sum of evaporation from soil and plant surface, water bodies, and plant transpiration. Accurately quantifying ET at multiple scales is increasingly recognized to be critical for water resource management and sustainable agriculture under a changing climate.

According to the Köppen climate classification, a temperate climate (C) has a mean air temperature between −3 °C and 18 °C in the coldest month, warm summers, cold winters, and intermediate levels of precipitation. The temperate climate zone represents about 18% of the Earth’s total land area. It is also home to most of the human population with its land use dominated by agricultural crops (43%) and forests (33%) (www.esa‑landcover‑cci.org). Forests are an established part of the history and culture of the temperate zone.

Agroforestry is broadly defined as a land use system that deliberately combines trees and/or shrubs (hereafter ‘trees’ for brevity) with crops and/or livestock to produce multiple benefits. Agroforestry has been practiced by Indigenous and other traditional cultures over millennia and remains prevalent today, especially in tropical regions. More recently, agroforestry has been promoted globally as a climate smart strategy for sustainable food production that maintains or enhances ecosystem services, including hydrological service. Agroforestry can be inte-grated with ecological restoration...