Navigation Links
Impact of floods on soils
Date:4/8/2009

MADISON, WI, APRIL 7, 2009 -- A recent study conducted in the Midwestern United States examined the effects of harsh wet conditions on both cultivated and uncultivated soils, vastly advancing the knowledge of water's effects on aggregation. Soil aggregation is an important soil attribute that is related to the physical-chemical state of the soil, and is one of the essential processes that determine soil quality. During the wet season in the U.S. Midwest, upland soils are often under water for days or weeks, causing oxygen depletion, or reducing conditions, which may in turn affect the chemistry of the soil-water system and, consequently, soil aggregation. Loss of soil aggregation impacts agriculture by decreasing soil quality and crop production.

Recently, soil scientists investigated how changes in the reduction-oxidation (redox) status of the soil can impact soil aggregation during short-term ponding conditions. The group included Alfredo De-Campos, a former graduate student from Purdue University, and Amrakh Mamedov and Chi-hua Huang, from USDA Agricultural Research Service, National Soil Erosion Research Laboratory at West Lafayette, IN. Results from this study were published in the March/April, 2009 issue of Soil Science Society of America Journal.

To carry out the research, six different upland soils, three cultivated and three uncultivated, with different organic carbon and similar mineralogy were incubated up to 14 days in an anaerobic biogeochemical reactor. After each treatment, the soil solution was analyzed for metals and dissolved organic carbon. A simple laboratory procedure that measures the degree of aggregate breakdown during wetting was used to determine aggregate stability of the incubated soil samples.

The research revealed that the aggregate stability of upland soils was decreased under reducing conditions from short-term water ponding. The decrease in aggregate stability reached approximately 20% during a 14-day ponding period, which is quite significant in terms of soil disaggregation. Changes in redox sensitive elements, alkaline metals, and dissolved organic carbon under reducing conditions contributed to the decrease in aggregate stability.

Overall, the aggregate stability of cultivated soils was more affected by the reducing conditions than that of uncultivated soils. This indicates that the management system plays an important role in the stability of aggregates.

The use of natural soils without addition of chemicals simulated a realistic field situation when aerobic upland soils remained saturated for several days and the oxygen level depleted to a minimum, causing reducing conditions. The authors believe that once the reducing reactions take place in the field and disaggregation has occurred, the process will not reverse itself because the natural drainage will carry away the released chemicals and the chemistry of the soil-water system will not return to the original state. The disintegrated aggregates may clog the soil pores and further degrade the soil structure.

However, reducing conditions only occur for short periods of time during the wet season in upland soils, whereas aggregation processes operate for several months causing re-aggregation of soil particles. The long-term irreversibility in soil disaggregation caused by the short-term reducing conditions remains an open question.


'/>"/>

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

Related biology news :

1. UBC study first to show evolutions impact on ecosystems
2. Study assesses impact of fish stocking on aquatic insects
3. Professor to measure environmental impact of war
4. GEN reports on Madoff scandals impact on the life sciences
5. Rising sea levels set to have major impacts around the world
6. How increased UV exposure impacts plants
7. Lower increases in global temps could lead to greater impacts than previously thought, study finds
8. Experiment of nature examines how mothers diet may impact on childs health
9. Darwins seminal impact on biology, anthropology, philosophy and psychology
10. Climate changes impact on invasive plants in Western US may create restoration opportunities
11. PSEGs Ralph Izzo to explore at NJIT the impacts of climate change, more
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/14/2016)... BioCatch ™, the global ... the appointment of Eyal Goldwerger as CEO. ... Goldwerger,s leadership appointment comes at a time of significant ... of its platform at several of the world,s largest ... unique cognitive and physiological factors, is a winner of ...
(Date:3/29/2016)... , March 29, 2016 ... "Company") LegacyXChange "LEGX" and SelectaDNA/CSI Protect are pleased to ... ink used in a variety of writing instruments, ensuring ... of originally created collectibles from athletes on LegacyXChange will ... analysis of the DNA. Bill Bollander ...
(Date:3/21/2016)... -- Unique technology combines v ...   Xura, Inc. (NASDAQ: ... communications services, today announced it is working alongside SpeechPro ... particularly those in the Financial Services Sector, the ability ... a mobile app, alongside, and in combination with, traditional ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... 2016 ReportsnReports.com adds 2016 ... its pharmaceuticals section with historic and forecast data ... more. Complete report on the Cell ... 15 companies and supported with 261 tables and ... . The Global Cell Culture Media ...
(Date:6/22/2016)... Research and Markets has announced the addition of the ... The global biomarkers market has ... The market is expected to grow at a five-year compound annual ... $50.6 billion in 2015 to $96.6 billion in 2020. ... to 2020) are discussed. As well, new products approved in 2013 ...
(Date:6/22/2016)... 2016   StockNewsNow.com , The Official MicroCap News ... Nader Pourhassan , President & CEO of CytoDyn ... clinical development and potential commercialization of humanized monoclonal antibodies ... to the company,s website (see here: www.CytoDyn.com ). ... th , 2016, at the LD Micro Invitational in ...
(Date:6/22/2016)... --  ViaCyte, Inc. , a privately-held regenerative medicine company ... for the treatment of diabetes in clinical-stage development, today ... 2016, the Global Stem Cell Event, is taking place ... Francisco.    ... Focus Session: Tools for Basic and Applied Stem Cell ...
Breaking Biology Technology: