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Keyword: gas exchange

Physiological attributes of 11 Northwest conifer species

Publications Posted on: May 12, 2016
The quantitative description and simulation of the fundamental processes that characterize forest growth are increasing in importance in forestry research. Predicting future forest growth, however, is compounded by the various combinations of temperature, humidity, precipitation, and atmospheric carbon dioxide concentration that may occur.

Forecasting the influence of climate change on invasive weeds and weed biological control

Science Spotlights Posted on: February 10, 2016
Rocky Mountain Research Station scientists are investigating how climate change, namely elevated levels of CO2, might impact invasive species and classical biological control of weeds. A mechanistic approach to understanding how climate change may impact interactions between invasive plants and their biocontrol agents is essential for realistically addressing management needs under likely future field conditions.

Response of conifer species from three latitudinal populations to light spectra generated by light-emitting diodes and high-pressure sodium lamps

Publications Posted on: December 16, 2015
Light-emitting diode (LED) technology shows promise for supplementing photosynthetically active radiation (PAR) in forest nurseries because of the potential reduction in energy consumption and an ability to supply discrete wavelengths to optimize seedling growth.

Importance of the method of leaf area measurement to the interpretation of gas exchange of complex shoots

Publications Posted on: May 28, 2015
Net CO(2) uptake in full sunlight, total leaf area (TLA), projected leaf area of detached leaves (PLA), and the silhouette area of attached leaves in their natural orientation to the sun at midday on June 1 (SLA) were measured for sun shoots of six conifer species. Among species, TLA/SLA ranged between 5.2 and 10.0 (x bar = 7.3), TLA/PLA ranged between 2.5 and 2.9 (x bar = 2.7) and PLA/SLA ranged between 2.0 and 3.7 (x bar = 2.2).

Forecasting the influence of climate change on invasive weeds and biological control

Projects Posted on: April 28, 2015
Rocky Mountain Research Station scientists are investigating how climate change, namely elevated levels of CO2, might impact invasive species and classical biological control of weeds.

Role of temperature and moisture in the survival and seedling physiology of a Great Basin perennial

Publications Posted on: October 03, 2014
Munro's globemallow (Sphaeralcea munroana) is an important constituent of Great Basin communities and is commonly used in restoration; however, little is known about the influence of environmental conditions on early plant establishment. The objective of this study was to evaluate the response of Munro's globemallow to a suite of temperature and moisture conditions directly following germination.

Ecosystem CO2/H2O fluxes are explained by hydraulically limited gas exchange during tree mortality from spruce bark beetles

Publications Posted on: October 02, 2014
Disturbances are increasing globally due to anthropogenic changes in land use and climate.

Growth and gas exchange of different ponderosa pine stock types on dry sites

Publications Posted on: December 01, 2010
Successful seedling establishment following outplanting relies heavily on a seedling's ability to access soil moisture. In the Inland Northwest USA, the summer season brings drought conditions causing low soil moisture in the upper soil profile - a potentially large barrier to seedling establishment.

Root desiccation and drought stress responses of bareroot Quercus rubra seedlings treated with a hydrophilic polymer root dip

Publications Posted on: March 19, 2009
Root hydrogel, a hydrophilic polymer, has been used to improve transplanting success of bareroot conifer seedlings through effects on water holding capacity.

Physiological responses of planting frozen and thawed Douglas-fir seedlings

Publications Posted on: January 22, 2009
We studied the short-term (7-day) physiological responses of planting thawed and frozen root plugs of Douglas-fir (Pseudotsuga menziesii) seedlings in 2 separate experiments under cool-moist and warm-dry growing conditions, respectively.