Phosphorus Sorption Characteristics of Flooded Soils

Khalid, R. A.; Patrick, W. H.; DeLaune, Ronald D.

doi:10.2136/sssaj1977.03615995004100020026x

Cited by 161 publications

(70 citation statements)

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“…Wetlands reduce nutrients by encouraging sedimentation (Karr and Schlosser, 1978;Johnston et al, 1984), sorbing nutrients to sediments (see Khalid et al, 1977), taking up nutrients in plant biomass (Lee et al, 1975) and enhancing denitrification (Lowrance et al, 1984). While the evidence for this arises from a number of separate studies, some studies show that wetlands can be ineffective at reducing nutrient loadings, or might even increase nutrient loadings.…”

Section: How Can Wetlands Change Nutrient Loads?mentioning

confidence: 99%

Wetland nutrient removal: a review of the evidence

Fisher

Acreman

2004

Hydrol. Earth Syst. Sci.

369

222

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Data from 57 wetlands from around the world have been collated to investigate whether wetlands affect the nutrient loading of waters draining through them; the majority of wetlands reduced nutrient loading and there was little difference in the proportion of wetlands that reduced N to those that reduced P loading. However, some wetlands increased nutrient loadings by increasing the loading of soluble N and P species thus potentially driving aquatic eutrophication. Studies conducted over a period of a year or more, or that involved frequent sampling during high flow events, were more likely to indicate that the wetland increased nutrient loadings. Swamps and marshes differed from riparian zones in their nutrient function characteristics by being slightly more effective at nutrient reduction than riparian zones. The attributes that enable wetlands to be effective in reducing N and P loadings need consideration when constructing or managing wetlands to reduce nutrient loadings. Their wise use will be an important strategy for meeting the Water Framework Directive requirements for many water bodies.

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Section: How Can Wetlands Change Nutrient Loads?mentioning

confidence: 99%

Wetland nutrient removal: a review of the evidence

Fisher

Acreman

2004

Hydrol. Earth Syst. Sci.

369

222

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“…All copyrights reserved. (Khalid et al, 1977;Richardson, 1985;Gale et al, 1994). Therefore, sediment samples were extracted using an oxalate reagent and regression relationships were determined for Fe ox and Al ox with TP and P max concentrations.…”

Section: Regression Analyses Between Sediment Organicmentioning

confidence: 99%

Phosphorus Sorption by Sediments in a Southeastern Coastal Plain In‐Stream Wetland

Novak¹,

Watts²

2006

J of Env Quality

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A close relationship has been reported between sediment organic C (SedOC) content and its P sorption capacity (P max ) and total P (TP) concentration. Phosphorus sorbed to organically complexed cations is a proposed explanation for this relationship. The objectives of this study were (i) to determine relationships between in-stream wetland SedOC content and both the sediment's P max and TP concentrations, and (ii) to ascertain the role of both organically complexed and oxalate-extractable cations on the sediment P max and TP values. The sediment's oxalate-extractable Fe (Fe ox ) and Al (Al ox ) contents were determined using acidified ammonium oxalate, while sodium pyrophosphate was used to extract organically complexed cations (Al pryo , Ca pyro , Fe pyro , Mg pyro , and Mn pyro ). Both the sediment's P max and TP contents were strongly correlated with its SedOC concentration (r 2 .0.90, P , 0.001). Only the Al ox contents were significantly correlated with TP and P max , suggesting that amorphous Al forms have an important role in P sorption. All five pyrophosphate-extracted cations were significantly correlated with SedOC contents. Regression analyses showed that the Al pyro accounted for 88% of the variation in sediment P max values, whereas a combination of Al pyro and Ca pyro accounted for 98% of the variation in sediment TP concentrations. Additionally, Al and Ca chelated by SedOC compounds also have an important role in P binding and indicate that a linkage exists between the wetlands SedOC and P max content and its ability to accumulate TP. This study identified that two different mechanisms have significant roles in regulating P sorption by sediments in a southeastern Coastal Plain in-stream wetland. WETLANDS have an important role in influencing P concentrations in streams, rivers, and estuaries along the southeastern U.S. coast (Reddy et al., 1999). Wetlands can act as a sink for P (Reddy et al., 1999;Novak et al., 2004). If wetlands are overloaded with P, however, they can release P, thereby acting as a source (Richardson, 1999;Novak et al., 2004). A wetland's P sink-source relationship is controlled by biological, physical, and chemical processes that function in the wetland's water column and underlying sediment. Biological processes (i.e., macrophytes and algae) can account for 10 to 50% of P binding in the water column and sediment pore water (Haggard et al., 1999;Richardson, 1999). On the other hand, physical and chemical processes associated with soils and sediments can bind between 80 and 90% of P that flows through wetlands (Richardson, 1999 (Richardson, 1985;Reddy et al., 1995Reddy et al., , 1999, redox status (Golterman, 1995), and the SedOC content (McDowell et al., 2003;Hogan et al., 2004;Wang et al., 2005;Bruland and Richardson, 2006).The involvement of Fe and Al oxides and hydroxides in P binding by wetland sediments is well established; however, the mechanism that promotes P binding by SedOC remains unclear. Phosphorus sorption by organic C (OC) structures is unlikely, because...

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“…However, the regression coefficient for clay was only found to be highly significant indicating that the clay content dominated the P adsorption of these soils, Jalali and Sharma (1987) also found 80.5% variation in P adsorption due to clay and organic matter out of which 73% was due to clay content. pH may decrease or increase or have no effect on P sorption depending upon the experimental conditions (Tomar, 2000).Positive and significant correlation between P adsorption and clay content have been reported by several workers Teckchand and Tomar, 1992, Murthy et al, 1996William et al, 1958, Udo and Uzo, 1972and Khalid et al, 1977 …”

Section: Multiple Regression Coefficientsmentioning

confidence: 91%