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:12/2/2016)... ... ... years, Doctors on Liens has published a directory of the top doctors working ... When the company started in 1997, the directory was a single page focusing on chiropractors ... directory features a vast array of medical specialists stretching from Sacramento to San ...
(Date:12/2/2016)... ... December 02, 2016 , ... Center for Autism and ... of those affected by autism spectrum disorder (ASD) and other developmental disabilities. The group, ... will give parents and other caregivers the opportunity to share stories and advice, seek ...
(Date:12/2/2016)... ... December 02, 2016 , ... Mediaplanet’s newest campaign, ... standing as living proof that attitude and determination can combine into the most ... spike around the holidays. This campaign will offer patients a new-found hope, by ...
(Date:12/2/2016)... ... December 02, 2016 , ... ... version of its SaaS LIMS, CloudLIMS Lite. CloudLIMS Lite helps biobanks, clinical, research ... labeling, storing, shipping and disposal. The new version is a faster and a ...
(Date:12/2/2016)... Wexford, PA (PRWEB) , ... December 02, 2016 , ... ... manages stress and overall health, day and night. No other wearable health technology on ... management. We wanted to give poeple more meaningful insights about their health than ...
Breaking Medicine News(10 mins):
(Date:12/2/2016)... , Dec. 2, 2016  LifeVac, the revolutionary ... included in the Emergency Response Training and Support Services ... excited to have LifeVac become part of the ERTSS ... Founder and CEO of LifeVac. "Having an established network ... and effectively will help leverage our efforts to spread ...
(Date:12/2/2016)... -- PipelineRx, a leading medication management technology company focused ... its SaaS-based telepharmacy platform, PowerGridRx™ , at ... Clinical Meeting and Exhibition, December 5-7 in ... hospital clients nationally, the Company is a leader ... improve pharmacy operations, enhance patient safety, and reduce ...
(Date:12/2/2016)... 2, 2016  Maxor National Pharmacy Services, LLC ("Maxor"), today ... Inc. ("PSI").  The combination of Texas -based ... -based PSI bring together both company,s clinical expertise and high-touch ... an industry-leading specialty pharmacy. About Maxor ... , , ...
Breaking Medicine Technology: