Navigation Links
Wildfire and an example of its important link to the ecosystem
Date:5/31/2012

Thursday, May 31, 2012 - Traveling the western U.S. state of Nevada in the 1860s, a young American writer named Mark Twain heard a "world of talk" about the beauty of Lake Tahoe and so set out one August day to see the lake perched high in the Sierra Nevada Mountains. Determined to make the 11-mile journey on foot, Twain and his companions became briefly discouraged after toiling up one mountain and then another to no avail. But they trudged on until "at last the Lake burst upon us," Twain wrote in his 1872 book, Roughing It.

One hundred and fifty years later, visitors to this border region between California and Nevada still marvel at Lake Tahoe, but sadly the "jewel of the Sierra" is not the same gem it was in Twain's time. Boating on the lake during his trip, Twain said he could see rocks at least 80 feet below the surfacea degree of clarity that scientists attribute to "ultra-oligotrophic" conditions, meaning exceptionally nutrient-poor and pure. Since the 1960s, however, Lake Tahoe's renowned water quality has been in slow decline, and exactly why "is the $64,000 question," says soil scientist Dale Johnson of the University of Nevada in Reno.

Damaging blazes sweep the Tahoe region regularly, and by the time Johnson teamed up with his University of Nevada colleague, Wally Milleran expert on Tahoe's water qualityscientists already knew how catastrophic fires could affect downstream streams and lakes. Wildfire can leave slopes bare of vegetation and unprotected from erosion. Burning also releases nitrogen, phosphorus, sulfate, and other biochemicals locked in plants, wood, and soils, allowing the nutrients to run off downslope or seep into groundwater. But when Miller and Johnson began their studies, they discovered something that few, if anyone, had suspected: Not only could a major disturbance like fire affect Lake Tahoe, but so too could a lack of disturbancethe absence of fire. "The results were very surprising and therefore very hard to publish," Johnson says. "No one believed it."

But the findings also lead to a dilemma. On one hand, wildfire is beneficial in that it burns away decades of accumulated organic material, which Johnson and Miller have shown can potentially be a slow but significant source of nutrients to Lake Tahoe. On the other hand, severe wildfire can also deplete forests of nitrogen and send pulses of nutrients downstreamnot to mention the damage it does to timber and private property.

"So what do you do?" Miller asks. The answer lately embraced by forest managers is to mimic the natural, Sierran fire regime that existed before aggressive fire suppression began. Managers will purposely light small, controlled fires to burn away accumulated woody debris. Or they'll remove wood with harvesting equipment or chip it on site.

But managers don't want to remove too many nutrients from the system, since they're needed to support future generations of trees. So Miller and Johnson have been studying the practices' impacts on nutrients and on water quality, just as they earlier investigated catastrophic wildfire and fire suppression.


'/>"/>

Contact: Teri Barr
tbarr@sciencesocieties.org
608-268-3976
American Society of Agronomy
Source:Eurekalert  

Related biology news :

1. Wildfires cause ozone pollution to violate health standards, new study shows
2. When it comes to forest soil, wildfires pack 1-2 punch
3. Wildfires result in loss of forests reserved by Northwest Forest Plan
4. Where theres wildfire smoke, theres toxicity
5. Plants could override climate change effects on wildfires
6. NASA study says climate adds fuel to Asian wildfire emissions
7. In the warming West, climate most significant factor in fanning wildfires flames
8. Wildfires set to increase 50 percent by 2050
9. Georgia State researcher to use $1 million grant to improve computer models for fighting wildfires
10. Developing blanket protection from wildfires
11. Undergrad engineers research everything from water quality to wildfires this summer
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Wildfire and an example of its important link to the ecosystem
(Date:4/5/2017)... April 5, 2017 Today HYPR Corp. ... the server component of the HYPR platform is officially ... the end-to-end security architecture that empowers biometric authentication across ... has already secured over 15 million users across the ... of connected home product suites and physical access represent ...
(Date:4/3/2017)... 3, 2017  Data captured by IsoCode, ... detected a statistically significant association between the ... treatment and objective response of cancer patients ... predict whether cancer patients will respond to ... well as to improve both pre-infusion potency testing ...
(Date:3/30/2017)... , March 30, 2017 Trends, opportunities ... (physiological and behavioral), by technology (fingerprint, AFIS, iris recognition, ... recognition, and others), by end use industry (government and ... immigration, financial and banking, and others), and by region ... , Asia Pacific , and ...
Breaking Biology News(10 mins):
(Date:7/20/2017)... ... , ... Dr. Asher Kimchi, Founder and Chairman of the International Academy ... the 22nd World Congress on Heart Disease held in Vancouver, BC, Canada. In addition ... Fellowship Awards. , Dr. Asher Kimchi, together with Co-Chairmen Dr. John A. Elefteriades and ...
(Date:7/20/2017)... ... 2017 , ... VIC Technology Venture Development™ (VIC™), is pleased to ... This addition continues to strengthen and diversify VIC’s board. , "We are excited to ... a highly accomplished business executive with a broad range of experience directly relevant to ...
(Date:7/20/2017)... 20, 2017   KCNQ2 Cure Alliance  and ... company, today announced that they have completed the ... mutation implicated in KCNQ2 epileptic encephalopathy. They also ... second case involving an additional KCNQ2 genetic mutation. ... and Pairnomix entered into a collaboration to further ...
(Date:7/20/2017)... , ... July 20, 2017 , ... ... to make clinical trial sites and study participants truly unified. TrialKit, a native ... (FDA 21 CFR Part 11) research studies entirely on mobile devices. With TrialKit, ...
Breaking Biology Technology: