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Keyword: ecophysiology

Ecophysiological parameters for Pacific Northwest trees.

Publications Posted on: June 22, 2020
We developed a species- and location-specific database of published ecophysiological variables typically used as input parameters for biogeochemical models of coniferous and deciduous forested ecosystems in the Western United States. Parameters are based on the requirements of Biome-BGC, a widely used biogeochemical model that was originally parameterized for the forests of the Pacific Northwest.

Pyro-ecophysiology: Shifting the paradigm of live wildland fuel research

Publications Posted on: October 05, 2018
The most destructive wildland fires occur in mixtures of living and dead vegetation, yet very little attention has been given to the fundamental differences between factors that control their flammability. Historically, moisture content has been used to evaluate the relative flammability of live and dead fuels without considering major, unreported differences in the factors that control their variations across seasons and years.

The making of a scar: How fire scars develop in trees

Science Spotlights Posted on: September 12, 2016
When trees are injured they develop physical and chemical boundaries around the injury wound to resist infection. Trees also grow new wood to close over the injured place. Injuries caused by fires result in fire scars and we use the patterns of scarring among many trees to understand when and how often fires burn.  This research helps to understand the biological process of fire scar formation and use it to improve fire history analysis.

Big sagebrush (Artemisia tridentata) in a shifting climate context: Assessment of seedling responses to climate

Publications Posted on: October 07, 2015
The loss of big sagebrush (Artemisia tridentata) throughout the Great Basin Desert has motivated efforts to restore it because of fire and other disturbance effects on sagebrush-dependent wildlife and ecosystem function. Initial establishment is the first challenge to restoration, and appropriateness of seeds, climate, and weather variability are factors that may explain success or difficulties in big sagebrush restoration efforts.

Variation in foliar respiration and wood CO2 efflux rates among species and canopy layers in a wet tropical forest

Publications Posted on: July 08, 2015
As tropical forests respond to environmental change, autotrophic respiration may consume a greater proportion of carbon fixed in photosynthesis at the expense of growth, potentially turning the forests into a carbon source. Predicting such a response requires that we measure and place autotrophic respiration in a complete carbon budget, but extrapolating measurements of autotrophic respiration from chambers to ecosystem remains a challenge.

Resin duct size and density as ecophysiological traits in fire scars of Pseudotsuga menziesii and Larix occidentalis

Publications Posted on: October 03, 2014
Resin ducts (RDs) are features present in most conifer species as defence structures against pests and pathogens; however, little is known about RD expression in trees following fire injury.

Changes in tracheid and ray traits in fire scars of North American conifers and their ecophysiological implications

Publications Posted on: September 17, 2014
Fire scars have been widely used as proxies for the reconstruction of fire history; however, little is known about the impact of fire injury on wood anatomy. This study investigates changes in tracheid and ray traits in fire scars of Douglas fir (Pseudotsuga menziesii), western larch (Larix occidentalis) and ponderosa pine (Pinus ponderosa), and discusses their ecophysiological implications for tree recovery from fire.

Colorado Plateau chenopod field trip

Publications Posted on: September 18, 2013
The field trip was held on June 14, 2000, in warm, dry weather. It consisted of eleven stops and additional views from the busses. Many saltbush (Atriplex) species were observed and their genetical and ecological characteristics described. In addition other chenopod shrubs and annual chenopods were observed and characterized. The field trip is described so that is can be experienced by interested parties on subsequent trips.

Habitat improvement for wildlife in North-Central Sonora, Mexico

Publications Posted on: September 18, 2013
Native vegetation of semiarid grasslands and desert ecosystems that comprise the Arbosufrutescent Desert scrub vegetation in north-central Sonora has been degraded by overgrazing, drought, farming, woodcutting, and a host of other activities over the past century.

Ecological implications of using goats for control of juniper in Texas

Publications Posted on: September 18, 2013
The Edwards Plateau region of central Texas supports a rich diversity of plants and animals. The diversity and abundance of trees and shrubs is especially noteworthy, but two species of juniper (Juniperus ashei, Juniperus pinchotii) now dominate much of the landscape. Goats are currently being recommended to control juniper infestations.