Free Newsletters - Space News - Defense Alert - Environment Report - Energy Monitor
. Earth Science News .




WOOD PILE
Ozone Affects Forest Watersheds
by Staff Writers
Raleigh, NC (SPX) Oct 19, 2012


illustration only

U.S. Forest Service and Oak Ridge National Laboratory (ORNL) scientists have found that rising levels of ozone, a greenhouse gas, may amplify the impacts of higher temperatures and reduce streamflow from forests to rivers, streams, and other water bodies. Such effects could potentially reduce water supplies available to support forest ecosystems and people in the southeastern United States.

Impacts of ozone, a global scale pollutant, on forests are not well understood at a large scale. This modeling study indicates that current and projected increases in ozone in the 21st century will likely enhance the negative effects of warming on watersheds, aggravating drought and altering stream flow.

Using data on atmospheric water supply and demand and statistical models, researchers with the Forest Service and ORNL were able to show what effects ozone can have on stream flow in dry seasons.

Published in the November issue of the journal Global Change Biology, the study suggests that ozone has amplified the effects of warmer temperatures in reducing streamflow in forested watersheds in the southeastern United States.

"From previous studies, we know a lot about ozone's influences on crops and leaves of young trees. However, no studies have investigated the impacts of ozone on water flow in large forested watersheds," says Ge Sun, research hydrologist with the Forest Service Eastern Forest Environmental Threat Assessment Center "Our studies show that ozone has a possible connection in the reduction of streamflow in late summer when flow is generally lowest, particularly in areas with high ozone levels such as the Appalachian Mountains in the Southeast."

Researchers developed models based on 18 to 26 years of data and observed streamflow in response to climate and atmospheric chemistry during the growing season. The research team evaluated individual and interactive effects of ozone on late season streamflow for six southeastern forested watersheds ranging in size from 38 acres to more than 3,700 square miles.

Estimates of ozone's influence on streamflow ranged from 7 percent in the area of lowest ozone in West Virginia to 23 percent in the areas of highest exposure in Tennessee.

The findings from this study along with a wide range of previous field studies challenge assumptions derived from small controlled studies that ozone exposure reduces water loss from trees and forests. The present study of mature forests under moderate ozone exposure shows however those ecosystems may react in a different way than can be predicted by short-range, intensive studies.

"We're predicting that forests under high ozone conditions will use more water instead of less, as was previously assumed," says Samuel "Sandy" McLaughlin, scientist emeritus from the ORNL Environmental Sciences Division.

"The concern is that ozone-induced increases in plant water loss could aggravate drought impacts on forests, and reduce the water available for people and stream life dependent on water flow during the dry seasons."

Forest Service and ORNL scientists also collaborated with researchers from the University of Virginia, Lamont Doherty Observatory, and the University of Gothenburg, Sweden.

Access the article online here.

.


Related Links
US Forest Service
Forestry News - Global and Local News, Science and Application






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News





WOOD PILE
US sets dumping probe on Chinese plywood
Washington (AFP) Oct 18, 2012
The United States launched Thursday a probe of Chinese imports of hardwood and decorative plywood suspected of being sold at below-cost in the US market. The Commerce Department said the anti-dumping and countervailing duty investigations would look at imports of the products, composed of two or more layers of wood veneer in combination with a core. The plywood is used for indoor applica ... read more


WOOD PILE
Tiny travelers from deep space could assist in healing Fukushima's nuclear scar

Climate change helps drive N. America disasters: re-insurer

French broadcaster apologises to Japan over Fukushima gag

Planning can cut costs of disasters: World Bank

WOOD PILE
Taiwan temple to launch 'divine advice' app

Kennedy Supporting Effort to Develop Satellite Servicing Capabilities

Mapping The Universe In 3-D

Physicists crack another piece of the glass puzzle

WOOD PILE
Dinosaur-era acoustics: Global warming may give oceans the 'sound' of the Cretaceous

LSU research team shows negative impact of nutrients on coastal ecosystems

Why Are Coastal Salt Marshes Falling Apart?

Mathematics and the Ocean: Movement, Mixing and Climate Modeling

WOOD PILE
Green groups presses Antarctica meet to expand marine haven

Ice sheet retreat controlled by the landscape

1 by land and 1 by sea

NASA's Operation IceBridge Resumes Flights Over Antarctica

WOOD PILE
Some 500 scientists have created a Top 10 list of plant-damaging fungi

U of M scientist contributes to mapping of barley genome

Green leaf volatiles increase plant fitness via biocontrol

Viral alliances overcoming plant defenses

WOOD PILE
Mexico hurricane weakens into tropical depression

World's largest subwoofer: Earthquakes 'pump' ground to produce infrasound

Could a Hurricane Ever Strike Southern California?

Study advances understanding of volcanic eruptions

WOOD PILE
Life expectancy shoots up to 60 in SAfrica: study

Africa faces spike in older people living with HIV

Liberia,ICoast to hold joint manoeuvres on border by end of year

Liberian president in Ivory Coast to discuss border security

WOOD PILE
Japanese lake record improves radiocarbon dating

Novel chewing gum formulation helps prevent motion sickness

Discovery of two opposite ways humans voluntarily forget unwanted memories

The evolutionary origins of our pretty smile




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement