HOME >> BIOLOGY >> NEWS
Underlying cause of massive pinyon pine die-off revealed

f the Proceedings of the National Academy of Sciences. A complete list of authors and their affiliations is at the end of this release. Los Alamos National Laboratory (LANL), the National Science Foundation, the U.S. Forest Service, the U.S. Geological Survey, NASA and the National Institutes of Health funded the research.

Ecologists want to learn more about long-term changes in ecosystems that occur in response to climatic and other environmental variation.

So in 1987, researchers established a study site in the pinyon-juniper woodland zone at LANL. Roughly every two weeks, Breshears and his colleagues measured soil moisture on the 100-by-150 meter plot (about three times the size of a football field). Temperature and precipitation data were recorded at a nearby site. In 1992, the team began tracking tree mortality.

"I could see the plot from my office window," said Breshears, who used to work at LANL. When the recent drought hit, the scientists were well-positioned to compare how the vegetation fared before and during the drought.

Initially the trees managed, but in 2002 the pinyon pines began to die. By the end of 2003, more than 90 percent of the pinyons on the plot were dead. Breshears said, "I would see the trees go from vibrant green to pale, gasping green to pale brown to dropping all their needles."

Pinyon pines all over the Southwest were doing the same thing.

U.S. Forest Service's aerial surveys of the region's pinyon-juniper woodlands in 2002 and 2003 revealed significant tree die-off covering more than 4,600 square miles (12,000 square km).

The effect was so dramatic it could be detected by satellite.

Rich and his colleagues at LANL and the University of Kansas analyzed satellite images of the region's pinyon-juniper woodlands for the years 1989 through 2003 using a measure of vegetation greenness known as Normalized Difference Vegetation Index (NDVI). The weekly composite images came from
'"/>

Contact: Mari N. Jensen
mnjensen@email.arizona.edu
520-626-9635
University of Arizona
10-Oct-2005


Page: 1 2 3 4

Related biology news :

1. Study begins to reveal clues to the cause and progression of sepsis
2. Pollution causes 40 percent of deaths worldwide, study finds
3. deCODE discovers cause of major subtype of glaucoma
4. Inflammation may cause preterm labor and fetal deaths
5. Pregnant mothers join search for causes of autism
6. Marijuana component opens the door for virus that causes Kaposis sarcoma
7. U-M researchers find family of on switches that cause prostate cancer
8. Cell damage caused by brushing may help keep gums healthy
9. Seawater intrusion is the first cause of contamination of coastal aquifers
10. CRESIB coordinates an international consortium to fight malaria caused by Plasmodium vivax
11. Study examines cause of hearing loss for patients with certain genetic disease

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:6/4/2019)... TORONTO (PRWEB) , ... June 04, 2019 , ... ... automate the search for salient features of seizure risk signals, usually based on ... neurologist-driven EEG interpretation remains the only acceptable diagnostic methodology due to the complexity ...
(Date:6/1/2019)... ... May 31, 2019 , ... ... & Rosati recently invested in BioFactura’s $6M Series B Financing Round. , ... value-added institutional investors who bring significant financial and business resources to bear as ...
(Date:5/31/2019)... ... 30, 2019 , ... Join Julie Peacock, Vice President of ... Wednesday, June 19, 2019 at 1pm EDT where she will demonstrate how role-based ... and contract research organizations (CROs) can improve collaboration, auditing, document tracking and reporting. ...
Breaking Biology News(10 mins):
(Date:5/22/2019)... ... May 22, 2019 , ... Artemis (formerly ... $8 million Series A funding round co-led by Astanor Ventures and ... Development Fund and iSelect Fund . The company has raised $11.75m to ...
(Date:5/15/2019)... ... May 16, 2019 , ... Emulsifiers are the ... and beverage products rely on these ingredients to create stable quality food that ... This paradigm shift triggers food formulators to seek out alternatives for starches, gums ...
(Date:5/8/2019)... , ... May 07, 2019 , ... Standing at 16.2 hands, Atlas is on the ... in a drill team and barrel racing, among other activities. When loping around a ... He went from being a busy horse to only being able to walk. Fortunately ...
(Date:5/4/2019)... , ... May 03, 2019 , ... ... release of the Diopsys® ffERG/Photopic Negative Response vision test, a new ... By 2050, it is estimated that 6.3 million Americans will have glaucoma, with ...
Breaking Biology Technology:
Cached News: