Navigation Links
Melting snow provides clues for acidification
Date:2/15/2008

MADISON, WI, February 11, 2008 -- In forests of the northeastern United States, sulfate and nitrate are the dominant dissolved forms of sulfur and nitrogen in precipitation. In winter, these acidic agents accumulate in the snowpack and are released to groundwater and streams over a short period of time during spring snowmelt. This pulsed release of sulfate and nitrate in snowmelt can cause episodic acidification in poorly buffered soils, ultimately threatening the health of acid-sensitive biota.

There have been recent studies showing that biological cycling of sulfur and nitrogen persists in cold weather, despite below freezing air temperatures. Much of this activity occurs in soils, where an insulating snow layer keeps soil temperatures warm enough for a range of biological processes. Despite the growing awareness of winters role in sulfur and nitrogen cycling, many questions remain unanswered. In particular, there is much uncertainty about how sulfate and nitrate are retained or transformed in forest soils during cold weather.

In the November-December 2007 issue of the Soil Science Society of America Journal (SSSAJ), scientists from the U.S. Forest Service, SUNY-ESF, University of Calgary, and Cary Institute of Ecosystem Studies tracked the movement of sulfate and nitrate deposited in snow. A solution containing isotopically enriched sulfate and nitrate was sprayed on the surface of the snowpack during mid winter. The isotopic values of the labeled sulfate and nitrate were well above background levels and served as a tracer to follow the movement and transformation of these compounds in the ecosystem.

The researchers found that almost all of the labeled sulfate and nitrate deposited on the surface of the snow was recovered in snowmelt water, indicating that there were no significant transformations of sulfate and nitrate in the snowpack. In contrast, about half of the sulfate and nitrate was retained or transformed in the forest floor, suggesting that organic soils are a sink for these compounds during winter. For sulfate, the amount retained or transformed in the forest floor was nearly equal to the amount released, resulting in no significant net gains or losses. A significant amount of ammonium was produced in the forest floor indicating that N mineralization can be important, even when soil temperatures are near freezing. By contrast, net nitrification rates were very low during winter. Tracer results indicated that microbes did not immobilize snowpack nitrate and that other processes such as plant uptake, denitrification, and abiotic nitrate retention were probably more important factors affecting nitrate during snowmelt. More information on controls on nitrogen and sulfur cycling during winter is critical to our understanding of long-term trends and will help us predict how forest ecosystems will respond to future disturbances and global change processes.


'/>"/>

Contact: Sara Uttech
suttech@soils.org
608-268-4948
Soil Science Society of America
Source:Eurekalert

Related medicine news :

1. Investigational New Drug Application for Fat Melting Injections Cleared by the FDA
2. Non-Invasive Fat-Melting Procedures - Hype or Reality?
3. Study provides hope that some transplant patients could live free of antirejection drugs
4. Study provides hope that some transplant patients could live free of anti-rejection drugs
5. USAID Provides Additional Wildfire Assistance to Greece
6. LifeMasters Provides Tips for Maintaining a Healthy Blood Cholesterol Level
7. New knock-out gene model provides molecular clues to breast cancer
8. PreMD Provides Update on 510(k) Application for PREVU(x) POC
9. SIV infection of natural hosts provides new insights into HIV disease complexity
10. Microarray provides 3 genomic guides to breast cancer treatment decisions
11. Access Innovations Provides Support Services for Agis Network
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/26/2016)... ... June 26, 2016 , ... On June 10-11, 2016, A Forever Recovery, a ... and World’s Longest Breakfast Table in Battle Creek, MI, where the rehabilitation facility is ... to some of the world’s leading providers of cereal and other breakfast foods. Its ...
(Date:6/25/2016)... ... June 25, 2016 , ... ... issues and applications at AcademyHealth’s Annual Research Meeting June 26-28, 2016, at the ... several important health care topics including advance care planning, healthcare costs and patient ...
(Date:6/25/2016)... ... ... As a lifelong Southern Californian, Dr. Omkar Marathe earned his Bachelors in ... School of Medicine at UCLA. He trained in Internal Medicine at Scripps Green Hospital ... at the UCLA-Olive View-Cedars Sinai program where he had the opportunity to train in ...
(Date:6/24/2016)... ... June 24, 2016 , ... Those who have experienced traumatic events may ... to unhealthy avenues, such as drug or alcohol abuse, as a coping mechanism. To ... for healthy coping following a traumatic event. , Trauma sufferers tend to feel a ...
(Date:6/24/2016)... ... June 24, 2016 , ... ... micro-osteoperforation for accelerated orthodontic treatment. Dr. Cheng has extensive experience with all areas ... , AcceleDent, and accelerated osteogenic orthodontics. , Micro-osteoperforation is a revolutionary adjunct ...
Breaking Medicine News(10 mins):
(Date:6/23/2016)... ITASCA, Ill. , June 23, 2016  In a startling ... states are failing their residents by lacking a comprehensive, proven plan ... , a definitive ranking of how states are tackling the ... rating to only four states – Kentucky , ... and Vermont . Of the 28 failing states, ...
(Date:6/23/2016)... DUBLIN , June 23, 2016 ... "Key Pharma News Issue 52" report to their offering. ... need in influenza treatment creates a favourable commercial environment for ... and growing patient base that will serve to drive considerable ... flu vaccine would serve to cap sales considerably, but development ...
(Date:6/23/2016)... today announced the establishment of Astellas Farma Colombia (AFC), a new affiliate with operations headquartered in Bogota. ... ... ... ... Astellas is a ...
Breaking Medicine Technology: