You are here

Keyword: temperature

Why hardwoods do not grow naturally in the west

Publications Posted on: August 06, 2015
Unfortunately the beautiful hardwood trees which are native to the Eastern States do not grow naturally in the West. We have here only aspen, cottonwood, small birch, hawthorns, cherry, and alder. On the Pacific coast are oak and maple, but limited largely to lower moist sites such as streams bed and canyons.

Post-fire forest dynamics and climate variability affect spatial and temporal properties of spruce beetle outbreaks on a Sky Island mountain range

Publications Posted on: April 21, 2015
The spruce beetle (Dendroctonus rufipennis) is known for extensive outbreaks resulting in high spruce mortality, but several recent outbreaks in the western United States have been among the largest and most severe in the documentary record. In the Pinaleño Mountains of southeast Arizona, U.S.A., an outbreak in the mid-1990s resulted in 85% mortality of Engelmann spruce >7 cm diameter.

Maximum temperatures, needle mat, and vegetation measurements in pinyon-juniper microsites following prescribed burn in the Shoshone mountains of Nevada

Datasets Posted on: March 27, 2015
Temperature sensitive devices were placed in particular microsites throughout plots located in the Shoshone Mountain Range of central Nevada on the Humboldt-Toiyabe National Forest in Nye and Lander Counties. The area was then burned and the devices were collected and transcribed into a dataset that also contains depth of needle mat and tree/shrub measurements.

Best practices for continuous monitoring of temperature and flow in wadeable streams

Publications Posted on: October 03, 2014
The United States Environmental Protection Agency (U.S. EPA) is working with its regional offices, states, tribes, river basin commissions and other entities to establish Regional Monitoring Networks (RMNs) for freshwater wadeable streams.

Phenology and density-dependent dispersal predict patterns of mountain pine beetle (Dendroctonus ponderosae) impact

Publications Posted on: October 02, 2014
For species with irruptive population behavior, dispersal is an important component of outbreak dynamics. We developed and parameterized a mechanistic model describing mountain pine beetle (Dendroctonus ponderosae Hopkins) population demographics and dispersal across a landscape.

Climate-driven tree mortality: insights from the pinon pine die-off in the United States

Publications Posted on: October 23, 2013
The global climate is changing, and a range of negative effects on plants has already been observed and will likely continue into the future. One of the most apparent consequences of climate change is widespread tree mortality (Fig. 1). Extensive tree die-offs resulting from recent climate change have been documented across a range of forest types on all forested continents (Allen et al., 2010).

Improving our knowledge of drought-induced forest mortality through experiments, observations, and modeling

Publications Posted on: September 27, 2013
Regional and continental-scale forest and woodland mortality appears to be accelerating over recent decades (Allen et al., 2010; Peng et al., 2011). These contemporary increases in mortality are just the beginning, as temperature is rising rapidly and global models predict a large decline in the strength of the terrestrial carbon sink over the next century (Arora et al., 2013).

Environmental factors influencing Pyrenophora semeniperda-caused seed mortality in Bromus tectorum

Publications Posted on: June 26, 2013
Temperature and water potential strongly influence seed dormancy status and germination of Bromus tectorum. As seeds of this plant can be killed by the ascomycete fungus Pyrenophora semeniperda, this study was conducted to learn how water potential and temperature influence mortality levels in this pathosystem. Separate experiments were conducted to determine: (1) if P.

Effects of temperature on development, survival and reproduction of insects: Experimental design, data analysis and modeling

Publications Posted on: October 05, 2012
The developmental response of insects to temperature is important in understanding the ecology of insect life histories. Temperature-dependent phenology models permit examination of the impacts of temperature on the geographical distributions, population dynamics and management of insects.

Environmental effects on germination of Carex utriculata and Carex nebrascensis relative to riparian restoration

Publications Posted on: June 06, 2012
Seasonal riparian seedbed temperatures were measured and germination of Carex utriculata and C. nebrascensis seeds was tested in relation to chilling, perigynia removal, incubation temperature, and light to help guide propagation and direct seeding of these species for riparian restoration.