After increasing during much of the 20th century, forest cover in the eastern United States in recent decades has resumed its previous decline, according to an exhaustive new analysis published in the April 2010 issue of BioScience. The work is described in an article by Mark A. Drummond and Thomas R. Loveland of the US Geological Survey (USGS).
During the 19th century and earlier, forests were cleared for agriculture on a large scale, but from around 1920 onward, the eastern United States experienced a net increase in forest cover as fields were abandoned and trees regrew. Experts have been uncertain whether this trend has continued. Drummond and Loveland examined changes in the eastern part of the country from 1973 to 2000 as part of the USGS's Land Cover Trends project, using remotely sensed imagery as well as statistical data, field notes, and ground photographs. Over this time they found a 4.1 percent decline in total forest area, a "substantial and sustained net loss" equivalent to more than 3.7 million hectares. The researchers describe considerable regional variation, with net loss being particularly marked in the southeastern plains.
The net loss occurred even though reforestation of abandoned fields and pastures continues, in some regions more than others. Most net forest loss occurs as result of mechanical disturbance of forests for timber production, which keeps some land free of forest, and as a result of urban expansion, which is generally a permanent change. Mountaintop removal for mining in the Appalachian highlands has also had a "substantial impact" on eastern land cover, contributing more than 420,000 hectares of net forest decline. The authors comment that their findings suggest forest transitions may not plateau and stabilize after reaching a point of maximum recovery, which "has important implications for sustainability, future carbon sequestration, and biodiversity."
After noon EST on 7 April and for the remainder of the month, the full text of the article will be available for free download through the copy of this Press Release available at www.aibs.org/bioscience-press-releases/.
BioScience, published 11 times per year, is the journal of the American Institute of Biological Sciences (AIBS). BioScience publishes commentary and peer-reviewed articles covering a wide range of biological fields, with a focus on "Organisms from Molecules to the Environment." The journal has been published since 1964. AIBS is an umbrella organization for professional scientific societies and organizations that are involved with biology. It represents some 200 member societies and organizations with a combined membership of about 250,000.
The complete list of peer-reviewed articles in the April 2010 issue of BioScience is as follows:
The Functional Genomics of Inbreeding Depression: A New Approach to an Old Problem by Ken N. Paige
Induced Pluripotent Stem Cells: The Dragon Awakens by Weidong Han, Yali Zhao, and Xiaobing Fu
Land-use Pressure and a Transition to Forest-cover Loss in the Eastern United States by Mark A. Drummond and Thomas R. Loveland
Livestock Protection Dogs in the 21st Century: Is an Ancient Tool Relevant to Modern Conservation Challenges? by Thomas M. Gehring, Kurt C. VerCauteren, and Jean-Marc Landry
Forest History in East Africa's Eastern Arc Mountains: Biological Science and the Uses of History by Christopher A. Conte
Timothy Beardsley | EurekAlert!
Study relating to materials testing Detecting damages in non-magnetic steel through magnetism
23.07.2018 | Technische Universität Kaiserslautern
Innovative genetic tests for children with developmental disorders and epilepsy
11.07.2018 | Christian-Albrechts-Universität zu Kiel
Scientists at the University of California, Los Angeles present new research on a curious cosmic phenomenon known as "whistlers" -- very low frequency packets...
Scientists develop first tool to use machine learning methods to compute flow around interactively designable 3D objects. Tool will be presented at this year’s prestigious SIGGRAPH conference.
When engineers or designers want to test the aerodynamic properties of the newly designed shape of a car, airplane, or other object, they would normally model...
Researchers from TU Graz and their industry partners have unveiled a world first: the prototype of a robot-controlled, high-speed combined charging system (CCS) for electric vehicles that enables series charging of cars in various parking positions.
Global demand for electric vehicles is forecast to rise sharply: by 2025, the number of new vehicle registrations is expected to reach 25 million per year....
Proteins must be folded correctly to fulfill their molecular functions in cells. Molecular assistants called chaperones help proteins exploit their inbuilt folding potential and reach the correct three-dimensional structure. Researchers at the Max Planck Institute of Biochemistry (MPIB) have demonstrated that actin, the most abundant protein in higher developed cells, does not have the inbuilt potential to fold and instead requires special assistance to fold into its active state. The chaperone TRiC uses a previously undescribed mechanism to perform actin folding. The study was recently published in the journal Cell.
Actin is the most abundant protein in highly developed cells and has diverse functions in processes like cell stabilization, cell division and muscle...
Scientists have discovered that the electrical resistance of a copper-oxide compound depends on the magnetic field in a very unusual way -- a finding that could help direct the search for materials that can perfectly conduct electricity at room temperatur
What happens when really powerful magnets--capable of producing magnetic fields nearly two million times stronger than Earth's--are applied to materials that...
08.08.2018 | Event News
27.07.2018 | Event News
25.07.2018 | Event News
16.08.2018 | Life Sciences
16.08.2018 | Earth Sciences
16.08.2018 | Life Sciences