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Keyword: Pinus ponderosa

Fire regimes approaching historic norms reduce wildfire-facilitated conversion from forest to non-forest

Publications Posted on: April 23, 2018
Extensive high-severity wildfires have driven major losses of ponderosa pine and mixed-conifer forests in the southwestern United States, in some settings catalyzing enduring conversions to nonforested vegetation types. Management interventions to reduce the probability of stand-replacing wildfire have included mechanical fuel treatments, prescribed fire, and wildfire managed for resource benefit.

Uneven-aged silviculture in cedar-hemlock-grand fir ecosystems of the northern Rocky Mountains

Publications Posted on: March 30, 2018
Uneven-aged silviculture is used infrequently in the Northern Rocky Mountains. Because of wildlife, watershed, or scenic issues it is often preferred for managing many stands. While it has been applied in the ponderosa pine (Pinus ponderosa) forests it has had limited application in the grand fir (Abies grandis)-westem redcedar (Thuja plicate)-westem hemlock (Tsuga heterophylla) forests.

Growth and survival before and after a mountain pine beetle outbreak in a ponderosa pine genetic trial

Datasets Posted on: March 15, 2018
This data package contains data used for the publication "An insect outbreak shifts the direction of selection from fast to slow growth rates in the long-lived conifer Pinus ponderosa" (de la Mata et al. 2017). The study includes measurements from 204 half-sibling families planted in a common garden experiment planted in 1974 and last measured in 2013.

Northern New Mexico post-fire refugia data

Datasets Posted on: March 15, 2018
This publication contains spatial data, tabular data and scripts used to analyze the spatial patterns of refugia and associated plant communities following each of several fires in northern New Mexico. Four of the geotiff files were derived during the project (*Kernel.tif) using dNBR (delta Normalized Burn Ratio) or dNDVI (delta Normalized Difference Vegetation Index).

Fires following bark beetles: Factors controlling severity and disturbance interactions in ponderosa pine

Publications Posted on: January 09, 2018
Previous studies have suggested that bark beetles and fires can be interacting disturbances, whereby bark beetle-caused tree mortality can alter the risk and severity of subsequent wildland fires. However, there remains considerable uncertainty around the type and magnitude of the interaction between fires following bark beetle attacks, especially in drier forest types such as those dominated by ponderosa pine (Pinus ponderosa Lawson & C.

Radial and stand-level thinning treatments: 15-year growth response of legacy ponderosa and Jeffrey pine trees

Publications Posted on: December 14, 2017
Restoration efforts to improve vigor of large, old trees and decrease risk to high-intensity wildland fire and drought-mediated insect mortality often include reductions in stand density. We examined 15-year growth response of old ponderosa pine (Pinus ponderosa) and Jeffrey pine (Pinus jeffreyi) trees in northeastern California, U.S.A. to two levels of thinning treatments compared to an untreated (control) area.

Thinning reduces mountain pine beetle-caused tree mortality

Science Spotlights Posted on: October 12, 2017
The mountain pine beetle is an important bark beetle associated with ponderosa pine in the Black Hills. Episodic outbreaks can result in extensive tree mortality compromising ecosystem services. Strategies are needed to mitigate mortality levels where appropriate. This study sampled stands ranging from 35 acres to 365 acres and were widely distributed across the 6,000 square miles of the Black Hills.  

Spatial patterns of ponderosa pine regeneration in high-severity burn patches

Publications Posted on: September 28, 2017
Contemporary wildfires in southwestern US ponderosa pine forests can leave uncharacteristically large patches of tree mortality, raising concerns about the lack of seed-producing trees, which can prevent or significantly delay ponderosa pine regeneration.

Fine woody fuel particle diameters for improved planar intersect fuel loading estimates in Southern Rocky Mountain ponderosa pine forests

Publications Posted on: September 26, 2017
Fuel loading estimates from planar intersect sampling protocols for fine dead down woody surface fuels require an approximation of the mean squared diameter (d2) of 1-h (0-0.63 cm), 10-h (0.63-2.54 cm), and 100-h (2.54-7.62 cm) timelag size classes.

Density-dependent vulnerability of forest ecosystems to drought

Publications Posted on: September 08, 2017
Climate models predict increasing drought intensity and frequency for many regions, which may have negative consequences for tree recruitment, growth and mortality, as well as forest ecosystem services. Furthermore, practical strategies for minimizing vulnerability to drought are limited.