HOME >> BIOLOGY >> NEWS
Help students think like soil scientists
Date:9/28/2009

toration normally causes the water table to rise to the levels that existed before drainage and subsidence. If a soil has subsided 1 meter, for example, then when restored, the water table will be 1 m above the existing surface, creating ponding and impairing the growth of replanted vegetation. Determining how much soil has subsided can be difficult because there is typically no marker or baseline to indicate the position of the original soil surface prior to drainage. Data are only available to describe current conditions for a particular soil profile. Scientists must make use of mass-volume relationship and inference to assess the amount of subsidence that has occurred. Information about post-drainage and un-drained, offsite horizon thickness, bulk density, and mineral content can be used to develop an estimate of the amount of subsidence.

When approaching this problem, students should be encouraged to consider which mass and volume components of the three-phase (i.e. solid mineral and organic, liquid, and gas) soil system have been altered by subsidence. Both primary (i.e. loss of buoyancy and shrinkage) and secondary (i.e. oxidation) subsidence must be considered. From there we consider what relationships (e.g. bulk density and mineral content) have changed among these soil phases. Students can evaluate soil profile data obtained from drained and un-drained sites including sand content, bulk density, and horizon thickness. They may then begin to solve the problem by developing their own assumptions or may be guided to the assumptions in the original study:

Careful explanation of this example problem to students in undergraduate course work provides a way to incorporate concepts of mass, volume, soil bulk density, mineral and organic fractions, and subsidence in a practical, problem-solving framework. This, in turn, makes for a better understanding of how to compute other mass-volume soil properties such as water contents and porosity that, in

 Contact: Sara Uttech suttech@agronomy.org 608-268-4948 American Society of AgronomySource:Eurekalert 0GOOD

Page: 1 2 3

Related biology news :

1. Siebel Foundation awards top UC San Diego bioengineering graduate students
2. UAB students Nintendo Wii CPR earns American Heart Association support
3. International team of students and scientists on month-long field course in Siberian Arctic
4. Rosenstiel students come out on top
5. Students least informed about environmental science are most optimistic
6. Tufts students host Earth Day with groundbreaking ceremony for solar house
7. K-State using Second Life island to help high school students learn earth science
8. Bioscience institutions come together to launch Microlife Discovery Center for area students
9. Science internships attract students to research careers
10. At WPI, some students are learning its OK to peek
11. High school students paper published in prestigious college math journal
 *Name: *Comment: *Email:
(Date:8/19/2015)... 19, 2015  VOXX International Corporation (Nasdaq: ... into a Definitive Agreement to purchase the assets, ... market leader EyeLock through an acquiring entity.  Upon ... controlling interest in the acquiring entity. The closing ... due diligence.  Expanding on its existing supply chain ...
(Date:8/12/2015)... August 12, 2015 As the ... payment innovation and advanced biometrics technology is accelerating beyond ... consumers rely on using their credit cards, the digital ... future for payment services led by companies in the ... :  Google, Inc. (NASDAQ: GOOG ), Apple Inc. ...
(Date:8/10/2015)... The latest 364 page report from ... the global border security market . Visiongain ... 2015. Now: Border security is hard to achieve ... business critical issue you need to know about - and ... analysis of how this will impact your company and the ...
... The extinction of woolly mammoths and other large mammals more ... of cascade of ecosystem disruption that is being caused today by ... life scientists report July 1 in the cover article of the ... cascading events were originally begun by human disruption of ecosystems, a ...
... to breastfeed for at least the first six months of ... can sabotage their efforts, University of Florida researchers say. ... tissue under the tongue is too tight. A tongue tie ... and painlessly, and this struggle can lead many new mothers ...
... A new Florida State University study is investigating how quickly ... sands is being degraded by the sands, natural microbial communities, ... crude are helping or hindering that process. What oceanography ... them to predict when most of the oil in the ...
(Date:8/31/2015)... -- Research and Markets ( http://www.researchandmarkets.com/research/cbgl72/middle_east_and ) has announced ... Biomedical Sensors Market - Growth, Trends & Forecasts (2014-2020)" ... Middle East & Africa Biomedical ... at a CAGR of 3.26% over the period 2014-2020 ... that are adaptable to the genetic formulation of each ...
(Date:8/31/2015)... and SHANGHAI , Aug. ... biopharmaceutical company developing next-generation antibiotics, today announced positive ... study for its lead drug candidate MRX-I. MRX-I ... drug-resistant bacteria such as MRSA and VRE, while ... tolerated therapeutic option than currently available oxazolidinone agents. ...
(Date:8/31/2015)... ... 31, 2015 , ... The Food Processing Suppliers Association's PROCESS ... equipment manufacturers and leaders in the field of academia. , METTLER TOLEDO ... manufacturers of bakery and snacks; beverages; dairy; meat, poultry and seafood; and prepared ...
(Date:8/28/2015)... , August 28, 2015 According ... (Media, Sera, Cryogenic Storage Systems, Thawing Equipment, Alarms), by ... Medicine, Clinical Trials), End User - Global Forecast to ... expected to reach USD 3,731.03 Million by 2020 from ... of 11.65% between 2015 and 2020. ...
... Recurring Disposables, Services and Accessories Revenue ... Irrigated Catheter Launch Provided, ST. LOUIS, March 3 ... the fourth quarter and full year,ended December 31, 2007., ... to \$39.3 million,compared with \$27.2 million in 2006. Sales ...
... Feb. 29 For the first time,researchers at ... spheres whose halves are physically or chemically,different -- ... when an alternating electrical field is applied to ... research, published in the Feb. 8, 2008, edition,of ...
... Feb. 29 Kendle (Nasdaq: KNDL ... today,announced that Vice President and Chief Marketing ... Annual Raymond James,Institutional Investors Conference. The conference ... Cypress in Orlando, March 2-5, 2008. Kendle,s,presentation ...
...
Request Info...
... Conjugate, 2 ml. Streptavidin ... molecules for use in ... hybridization applications.High specificity reagents. ... & Detection, Protein Labeling ...
...
Biology Products: