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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

Journal Article

Phosphorus flux between sediment and overlying water in Lake Okeechobee, Florida: spatial and temporal variations  [1998]

Moore, P.A. Jr.; Reddy, K.R.; Fisher, M.M.;

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Total P is increasing over time in the waters of Lake Okeechobee, Florida but the concentrations do not correlate with external loads. The objectives of this study were to determine: (i) the P flux from various sediment types within the lake, (ii) the factors that control direction and magnitude of P flux and (iii) the amount of P associated with various inorganic P phases within the sediment. Phosphorus flux was measured from intact sediment cores taken from eight sites that represent major sediment types and major inflows of Lake Okeechobee at four time periods in 1989-1990. At the same location-times dissolved reactive phosphorus (DRP) in porewater was determined using porewater equilibrators and/or sediment cores. Results indicate that P flux from sediments is very sensitive to changes in O2 status of the overlying water, with anaerobic conditions promoting large P fluxes. Despite steep porewater DRP gradients in sediments (varying from 0.1 mg P L(-1) at the sediment/water interface to more than 1 mg P L(-1) at lower depths), P flux was not regulated by such gradients. Such lack of dependence of P flux on DRP gradients highlights the role redox reactions (involving Fe) can play in P chemistry in the top few centimeters of the sediment. Internal P loads (i.e., flux from bottom sediments) were found to be approximately equivalent to external P loads (approximately equal to 1 mg P m(-2) d(-1)).
From the journal
Journal of environmental quality
ISSN : 0047-2425

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2013
Volume:
27
Issue:
6
Start Page:
1428
End Page:
1439
All titles:
"Phosphorus flux between sediment and overlying water in Lake Okeechobee, Florida: spatial and temporal variations"@eng
Other:
"Includes references"
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Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
2013
Volume:
27
Issue:
6
Start Page:
1428
End Page:
1439
All titles:
"Phosphorus flux between sediment and overlying water in Lake Okeechobee, Florida: spatial and temporal variations"@eng
Other:
"Includes references"