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Keyword: thinning

Tree-ring growth and stable-carbon isotope response data to forest restoration treatments in ponderosa pine forests of the Lick Creek Demonstration-Research Forest, Bitterroot National Forest, Montana, USA

Datasets Posted on: December 30, 2020
This data publication includes the data used in "Forest restoration treatments in a ponderosa pine forest enhance physiological activity and growth under climatic stress" by Tepley et al. (2020).

Lick Creek: Lessons learned after 20+ years of fuel treatments in a ponderosa pine forest

Science Spotlights Posted on: September 08, 2020
Lick Creek is the longest running fuel treatment and restoration study of ponderosa pine forests in the northern U.S. Rocky Mountains. Through repeat photography and numerous published studies, we show how fuels and vegetation have changed over the 25 years since treatment and compare the effects of mechanical harvesting with and without prescribed burning.

Is three a crowd? The effect of stand density reduction on drought response

Science Spotlights Posted on: July 13, 2020
Three drought-tolerant tree species – Scots pine, sessile oak, and ponderosa pine – differ somewhat in their response to drought after stand density reductions. In this study, all species grew more each year on average when stand density was low rather than at maximum levels. Lower stand density reduced the drought susceptibility of Scots pine and sessile oak. Ponderosa pine, however, showed greater resistance and resilience to drought under higher, rather than lower, stand densities. Measures that reduce competition between trees are likely to help Scots pine and sessile oak adapt to a potentially drier and warmer climate, but such measures may have muted results compared to the effects of ponderosa pine’s adaptations to historically severely water-stressed conditions.

Science basis for changing forest structure to modify wildfire behavior and severity

Publications Posted on: June 22, 2020
Fire, other disturbances, physical setting, weather, and climate shape the structure and function of forests throughout the Western United States. More than 80 years of fire research have shown that physical setting, fuels, and weather combine to determine wildfire intensity (the rate at which it consumes fuel) and severity (the effect fire has on vegetation, soils, buildings, watersheds, and so forth).

Forest structure and fire hazard in dry forests of the Western United States

Publications Posted on: June 22, 2020
Fire, in conjunction with landforms and climate, shapes the structure and function of forests throughout the Western United States, where millions of acres of forest lands contain accumulations of flammable fuel that are much higher than historical conditions owing to various forms of fire exclusion.

Implications of reduced stand density on tree growth and drought susceptibility: A study of three species under varying climate

Publications Posted on: June 20, 2020
A higher frequency of increasingly severe droughts highlights the need for short-term measures to adapt existing forests to climate change. The maintenance of reduced stand densities has been proposed as a promising silvicultural tool for mitigating drought stress. However, the relationship between stand density and tree drought susceptibility remains poorly understood, especially across ecological gradients.

Forest restoration treatments in a ponderosa pine forest enhance physiological activity and growth under climatic stress [Ecological Applications]

Publications Posted on: June 03, 2020
As the climate warms, drought will increasingly occur under elevated temperatures, placing forest ecosystems at growing risk of extensive dieback and mortality. In some cases, increases in tree density following early 20th-century fire suppression may exacerbate this risk.

Stand density, drought and herbivory constrain ponderosa pine regeneration pulse

Publications Posted on: April 02, 2020
Trees in dry forests often regenerate in episodic pulses when wet periods coincide with ample seed production. Factors leading to success or failure of regeneration pulses are poorly understood. We investigated the impacts of stand thinning on survival and growth of the 2013 cohort of ponderosa pine (Pinus ponderosa Douglas ex P. Lawson & C.

Symposium Proceedings on Piñon-Juniper Habitats: Status and Management for Wildlife - 2016

Publications Posted on: February 10, 2020
Piñon-juniper vegetation types, including juniper woodland and savannah, piñon-juniper, and piñon woodland, cover approximately 40 million ha in the western United States, where they provide ecosystem services, wildlife habitat, and cultural and aesthetic value (Romme et al. 2009). These ecosystems are also the sites of oil and gas activities, grazing, and urban development and are impacted by changing climate and wildfire.

Biomass flow in western forests: Simulating the effects of fuel reduction and presettlement restoration treatments

Publications Posted on: December 23, 2019
Fuel treatment silviculture and the resulting long-term flow of biomass were examined using data from selected western stands. An uneven-aged management regime with reserve trees was modeled, using a canopy closure of 40 percent for the dominant trees as a target and a harvest cutting cycle of 20 years. Fuel reduction treatments in currently overstocked stands resulted in an initial peak of removal for the first and second cutting cycles.