Agricultural Research Service (ARS) rangeland scientists Jon Bates and Tony Svejcar conducted a study at a site dominated by a stand of invasive western junipers to assess different management strategies after the junipers have been cut down. ARS is USDA's principal intramural scientific research agency.
In the past century, junipers have begun to dominate some sagebrush grasslands in the western United States. Rangeland managers sometimes just cut down the invasive trees and leave them where they fall, which can help protect the soil from erosion. But the dead trees are an increased fire risk and may also create conditions that help cheatgrass--an invasive annual that fuels fierce wildfires--crowd out native perennials.
Bates and Svejcar, who work at the Eastern Oregon Agricultural Research Center in Burns, Ore., cut down a group of junipers and then burned them during the winter one and two years after they were felled. A control group of felled trees at the site was left unburned.
Ten years after the trees were burned, total herbaceous and perennial grass cover was 1.5 to 2 times greater in the areas where trees had been burned than in the areas where they were not burned. Perennial grass density was 60 percent greater in the burned sites than in the unburned sites, and cheatgrass cover was twice as dense in the control area than in the two burn areas.
The researchers concluded that burning the cut trees in winter helped protect existing perennials at the site because the soils were wet and frozen. This protection gave the perennials a head start in their growth the following spring, when they needed an edge against invasive annuals.
Results from this work, which support the USDA priority of responding to climate change, were published in Western North American Naturalist.
USDA is an equal opportunity provider, employer and lender. To file a complaint of discrimination, write: USDA, Director, Office of Civil Rights, 1400 Independence Ave., S.W., Washington, D.C. 20250-9410 or call (800) 795-3272 (voice), or (202) 720-6382 (TDD).
Ann Perry | EurekAlert!
New technique reveals details of forest fire recovery
17.05.2018 | DOE/Brookhaven National Laboratory
Mixed forests: ecologically and economically superior
09.05.2018 | Technische Universität München
So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics
Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...
The historic first detection of gravitational waves from colliding black holes far outside our galaxy opened a new window to understanding the universe. A...
A team led by Austrian experimental physicist Rainer Blatt has succeeded in characterizing the quantum entanglement of two spatially separated atoms by observing their light emission. This fundamental demonstration could lead to the development of highly sensitive optical gradiometers for the precise measurement of the gravitational field or the earth's magnetic field.
The age of quantum technology has long been heralded. Decades of research into the quantum world have led to the development of methods that make it possible...
Cardiovascular tissue engineering aims to treat heart disease with prostheses that grow and regenerate. Now, researchers from the University of Zurich, the Technical University Eindhoven and the Charité Berlin have successfully implanted regenerative heart valves, designed with the aid of computer simulations, into sheep for the first time.
Producing living tissue or organs based on human cells is one of the main research fields in regenerative medicine. Tissue engineering, which involves growing...
A team of scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg investigated optically-induced superconductivity in the alkali-doped fulleride K3C60under high external pressures. This study allowed, on one hand, to uniquely assess the nature of the transient state as a superconducting phase. In addition, it unveiled the possibility to induce superconductivity in K3C60 at temperatures far above the -170 degrees Celsius hypothesized previously, and rather all the way to room temperature. The paper by Cantaluppi et al has been published in Nature Physics.
Unlike ordinary metals, superconductors have the unique capability of transporting electrical currents without any loss. Nowadays, their technological...
02.05.2018 | Event News
13.04.2018 | Event News
12.04.2018 | Event News
18.05.2018 | Power and Electrical Engineering
18.05.2018 | Information Technology
18.05.2018 | Information Technology