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Keyword: productivity

Harvesting forest biomass in the US southern Rocky Mountains: cost and production rates of five ground-based forest operations

Publications Posted on: September 14, 2019
The forests of the southern Rocky Mountains of North America have experienced substantial change since European colonization. High-grade logging, forest grazing practices, and fire suppression have altered once park-like ponderosa pine-dominated ecosystems into dense forests in need of restoration treatments, but such treatments are challenged by the low-value wood products removed during treatment.

The fluctuating resource hypothesis explains invasibility, but not exotic advantage following disturbance

Publications Posted on: September 26, 2018
Invasibility is a key indicator of community susceptibility to changes in structure and function. The fluctuating resource hypothesis (FRH) postulates that invasibility is an emergent community property, a manifestation of multiple processes that cannot be reliably predicted by individual community attributes like diversity or productivity.

Supporting data for "Morphologic plasticity and increasing competition explain deviation from the Metabolic Scaling Theory in semi-arid conifer forests, southwestern USA"

Datasets Posted on: March 15, 2018
This data publication includes tree measurements taken 2008-2010 in three mixed conifer forests: the Pinaleño Mountains and Santa Catalina Mountains in southeastern Arizona, and the Jemez Mountains (Valles Caldera National Preserve) in northern New Mexico. Tree data measured at all locations include: species, condition, diameter at breast height and maximum vertical height.

Energy and minerals

Pages Posted on: February 06, 2017
These publications and tools provide information regarding energy and mineral development.

Carbon and nitrogen cycling in southwestern ponderosa fine forests

Publications Posted on: May 14, 2013
Ponderosa pine forests of the southwestern United States were historically characterized by relatively open, parklike stands with a bunchgrass-dominated understory. This forest structure was maintained by frequent, low-intensity surface fires. Heavy livestock grazing, fire suppression, and favorable weather conditions following Euro-American settlement in the late 19th century resulted in a dramatic increase in pine regeneration.

Skyline logging productivity under alternative harvesting prescriptions and levels of utilization in larch-fir stands

Publications Posted on: January 04, 2012
Larch-fir stands in northwest Montana were experimentally logged to determine the influence of increasingly intensive levels of utilization upon rates of yarding production, under three different silvicultural prescriptions. Variables influencing rate of production were also identified.

House Wrens adjust laying dates and clutch size in relation to annual flooding

Publications Posted on: July 19, 2010
I examined timing of reproduction and productivity in box-nesting House Wrens (Troglodytes aedon) inhabiting three riverbank woodlands subjected to different levels of flooding. In years when the North Platte River flooded its banks submerging ground foraging substrates, dates of nest initiation and egg laying in two wren populations were delayed and nonsynchronized.

Some factors affecting productivity in Abert's Towhee

Publications Posted on: July 15, 2010
Abert's Towhee (Pipilo aberti) is restricted to desert riparian zones of Arizona and bordering states (Phillips et al., The Birds of Arizona, Univ. Arizona Press, Tucson, Arizona, 1964). Its breeding behavior, communication, and physiological responses have been detailed by Marshall (Condor 62:49-64, 1960; pp. 620-622 in Proc. XIII Int. Omithol. Congr., Ithaca, New York, 1962; Condor 66:345-356, 1964), and Dawson (Univ. Calif. Publ. 2001.

Applying ecological insights to increase productivity in tropical plantations

Publications Posted on: March 25, 2010
In the 19th and 20th Centuries, forest productivity was examined largely as a retrospective exercise: growth of forests was tracked over time, and these historical trends were projected empirically into the future (Puettmann et al., 2008).

Reserved and roadless forests

Publications Posted on: November 20, 2009
Some 74 million acres of forest land, or 10 percent of all U.S. forest land, are permanently reserved from wood product utilization through statute or administrative designation. A large part of these lands is in wilderness areas, national parks, and national monuments.