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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

期刊文章

Soil Phosphorus Release and Storage Capacity from an Impacted Subtropical Wetland  [2010]

Bhadha, Jehangir H.; Harris, Willie G.; Jawitz, James W.;

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Cattle-based agriculture on sandy soils has generated concern over P leaching within the basin of Lake Okeechobee, Florida. Elevated P concentrations in surface and groundwater relate to P retention capacity of soils. To evaluate P release and storage capacity of impacted soils with fluctuating water tables, four intact soil cores were analyzed (one upland and three wetland) to determine their maximum sorption capacity (Smax), equilibrium P concentration (EPC0), and soil P storage capacity (SPSC) up to 160-cm depth. Sorption isotherms were measured for samples at 10-cm depth increments and data fitted to a Langmuir model (r2 ≥ 0.88). Both EPC0 and water-soluble P were higher at the surface and decreased with depth. Oxalate-extractable Fe and Al correlated with (i) oxalate-extractable P (r2 = 0.83), and (ii) Smax (r2 = 0.71). In situ pore water concentrations collected using multisamplers were consistently higher than EPC0 values. This discrepancy was much greater for near-surface horizons for which the difference may partially be due to redox-induced release of P previously scavenged by Fe under anaerobic (flooded) conditions. The SPSC values were positive, however, even when discounting Fe (i.e., assuming in situ chemical reduction) for samples from deeper horizons, suggesting that the small discrepancies for these horizons are not attributable to Fe oxidation. All cores had negative SPSC at the surface and high EPC0, suggesting that neither wetland nor u
pland soils safely sequester additional P. High pore water P values in the surface horizons are consistent with the inference of the surface soils potentially being a source for P.
来自期刊
Soil Science Society of America journal
ISSN : 0361-5995

书目信息

语言:
English
类型:
Journal Article
自何时收录于AGRIS:
2013
卷:
74
期:
5
起始页:
1816
结束页:
1825
所有题名:
"Soil Phosphorus Release and Storage Capacity from an Impacted Subtropical Wetland"@eng
其它:
"Includes references"
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书目信息

语言:
English
类型:
Journal Article
自何时收录于AGRIS:
2013
卷:
74
期:
5
起始页:
1816
结束页:
1825
所有题名:
"Soil Phosphorus Release and Storage Capacity from an Impacted Subtropical Wetland"@eng
其它:
"Includes references"