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Keyword: USA

Overstory structure and surface cover dynamics in the decade following the Hayman Fire, Colorado

Publications Posted on: March 22, 2018
The 2002 Hayman Fire burned with mixed-severity across a 400-ha dry conifer study site in Colorado, USA, where overstory tree and surface cover attributes had been recently measured on 20 0.1-ha permanent plots. We remeasured these plots repeatedly during the first post-fire decade to examine how the attributes changed through time and whether changes were influenced by fire severity.

Tree demography records and last recorded fire dates from the Pinaleño Demography Project, Arizona USA

Documents and Media Posted on: November 06, 2017
Enter summary (recommended) or leave this area entirely blank (delete this content) Text in the summary field displays in listings and provides more information to people browsing the site. Text in the summary field does not appear in the body of the page. Document Type: Other Documents

Competition amplifies drought stress in forests across broad climatic and compositional gradients

Publications Posted on: July 18, 2017
Forests around the world are experiencing increasingly severe droughts and elevated competitive intensity due to increased tree density. However, the influence of interactions between drought and competition on forest growth remains poorly understood.

Influences of prior wildfires on vegetation response to subsequent fire in a reburned Southwestern landscape

Publications Posted on: July 15, 2016
Large and severe wildfires have raised concerns about the future of forested landscapes in the southwestern United States, especially under repeated burning. In 2011, under extreme weather and drought conditions, the Las Conchas fire burned over several previous burns as well as forests not recently exposed to fire.

Sources and implications of bias and uncertainty in a century of U.S. wildfire activity data

Projects Posted on: March 16, 2016
There is a wealth of U.S. wildfire activity data available for analyses, but users must be aware of inherent reporting biases, inconsistencies, and uncertainty in the data in. Information is generally acquired from archival summary reports of the federal or interagency fire organizations. This project provides an overview of sources of data for U.S. wildfire activity analyses that highlights major reporting biases, inconsistencies, and uncertainty. 

Mixed-conifer forests of central Oregon: Effects of logging and fire exclusion vary with environment

Publications Posted on: October 07, 2015
Twentieth-century land management has altered the structure and composition of mixed-conifer forests and decreased their resilience to fire, drought, and insects in many parts of the Interior West. These forests occur across a wide range of environmental settings and historical disturbance regimes, so their response to land management is likely to vary across landscapes and among ecoregions.

The national forest inventory in China: History, results, international context

Publications Posted on: August 19, 2015
Main results and important changes in China’s NFI are documented, both to support continued trend analysis and to provide data users with historical perspective. New technologies and data needs ensure that the Chinese NFI, like the national inventories in other countries, will continue to evolve. Within the context of historical change and current conditions, likely directions for this evolution are suggested.

Effects of biological control agents and exotic plant invasion on deer mouse populations

Publications Posted on: April 21, 2015
Exotic insects are commonly introduced as biological control agents to reduce densities of invasive exotic plants. Although current biocontrol programs for weeds take precautions to minimize ecological risks, little attention is paid to the potential nontarget effects of introduced food subsidies on native consumers. Previous research demonstrated that two gall flies (Urophora affinis and U.

Invasive plant erodes local song diversity in a migratory passerine

Publications Posted on: October 01, 2014
Exotic plant invasions threaten ecosystems globally, but we still know little about the specific consequences for animals. Invasive plants can alter the quality of breeding habitat for songbirds, thereby impacting important demographic traits such as dispersal, philopatry, and age structure. These demographic effects may in turn alter song-learning conditions to affect song structure and diversity.

Granivory of invasive, naturalized, and native plants in communities differentially susceptible to invasion

Publications Posted on: October 01, 2014
Seed predation is an important biotic filter that can influence abundance and spatial distributions of native species through differential effects on recruitment. This filter may also influence the relative abundance of nonnative plants within habitats and the communities' susceptibility to invasion via differences in granivore identity, abundance, and food preference.