Soil phosphorus flux from emergent marsh wetlands and surrounding grazed pasture uplands

Dunne, E. J.; Clark, Mark W.; Mitchell, J.; Jawitz, James W.; Reddy, K. R.

doi:10.1016/j.ecoleng.2010.06.018

Cited by 33 publications

(20 citation statements)

References 41 publications

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“…Results of this study reinforce the findings (e.g., Dunne et al 2006;Cohen et al 2007;Dunne et al 2010;Bhadha and Jawitz 2010;Min et al 2010) that GIWs of the Florida peninsula have a high potential to retain P, but with the retention comes the possibility that the P sink may become a P source when runoff enters the GIW with values\EPC 0 . For instance, Yu et al (2006) reported P in runoff over 44 rain events across five Florida citrus grove sites to range from 0.51 to 2.64 mg P L -1 , sufficiently below our measured EPC 0 value to suggest that each event would cause a release of P to the water column, further increasing the P concentration.…”

Section: Resultssupporting

confidence: 83%

“…Phosphorus retention in GIWs has been examined in parts of the Southeastern U.S., especially in the Lake Okeechobee, Florida Watershed (e.g., Dunne et al 2006Dunne et al , 2010Bhadha and Jawitz 2010;Min et al 2010; see also Cohen et al 2007). Dunne et al (2007) reported that restoring 5-20 % of the GIW area in priority basins draining to Lake Okeechobee could increase P storage in GIWs by up to 13 kg P ha -1 , mostly through increased soil organic matter (OM) with its concomitant P in wetland soils.…”

Section: Introductionmentioning

confidence: 99%

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Phosphorus retention of forested and emergent marsh depressional wetlands in differing land uses in Florida, USA

Lane

Autrey

2015

Wetlands Ecol Manage

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The translocation of phosphorus (P) from terrestrial landscapes to aquatic bodies is of concern due to the impact of elevated P on aquatic system functioning and integrity. Due to their common location in depressions within landscapes, wetlands, including socalled geographically isolated wetlands (GIWs), receive and process entrained P. The ability of depressional wetlands, or GIWs, to sequester P may vary by wetland type or by land use modality. In this study we quantified three measures of P sorption capacities for two common GIW types (i.e., emergent marsh and forested wetlands) in two different land use modalities (i.e., agricultural and least impacted land uses) across 55 sites in Florida, USA. The equilibrium P concentration (EPC 0 ) averaged 6.42 ± 5.18 mg P L -1 (standard deviation reported throughout); and ranged from 0.01-27.18 mg P L -1 ; there were no differences between GIW type or land use modality, nor interaction effects. Significant differences in phosphorus buffering capacity (PBC) were found between GIW types and land use, but no interaction effects. Forested GIWs [average 306.64 ± 229.63 (mg P kg -1 ) (lg P L -1 ) -1 ], and GIWs in agricultural settings [average 269.95 ± 236.87 (mg P kg -1 ) (lg P L -1 ) -1 ] had the highest PBC values. The maximum sorption capacity (S max ) was found to only differ by type, with forested wetlands (1274.5 ± 1315.7 mg P kg -1 ) having over three times the capacity of emergent GIWs (417.5 ± 534.6 mg P kg -1 ). Classification trees suggested GIW soil parameters of bulk density, organic content, and concentrations of total P, H 2 O-extractable P, and HCl-extractable P were important to classifying GIW P-sorption metrics. We conclude that GIWs have high potential to retain P, but that the entrained P may be remobilized to the wetland water column depending on storm and groundwater input P concentrations. The relative hydrologic dis-connectivity of GIWs from other aquatic systems may provide sufficient retention time to retain elevated P within these systems, thereby providing an ecosystem service to downstream waters.

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Section: Resultssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Phosphorus retention of forested and emergent marsh depressional wetlands in differing land uses in Florida, USA

Lane

Autrey

2015

Wetlands Ecol Manage

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“…1). The size of the isolated wetland chosen for this study was approximately 1 ha and the surrounding uplands were cow-calf pasture lands with low stocking density of approximately 1 head ha −1 (Cheesman et al, 2010;Dunne et al, 2010). This site was stratified into three zones according to distinct hydrological conditions and characteristic vegetation: isolated wetland center zone (Center), transient edge zone (Edge), and pasture upland zone (Upland).…”

Section: Site Description and Soil Samplingmentioning

confidence: 99%

Nitrous oxide production and consumption by denitrification in a grassland: Effects of grazing and hydrology

Inglett

Clark

et al. 2015

Science of The Total Environment

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“…However, after the external loading is reduced, the sediments now as a source would release the adsorbed P back into the water. The characteristics of sediments, environmental factors, as well as the concentrations of P in the overlying water, will affect the transfer direction of phosphate on the interface of the sediment-water [25][26].…”

Section: Parametersmentioning

confidence: 99%

Eutrophication: Status, Trends and Restoration Strategies for Palic Lake

Raičević¹,

Božić²,

Rudić³

et al. 2013

Water Treatment

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Soil phosphorus flux from emergent marsh wetlands and surrounding grazed pasture uplands

Cited by 33 publications

References 41 publications

Phosphorus retention of forested and emergent marsh depressional wetlands in differing land uses in Florida, USA

Phosphorus retention of forested and emergent marsh depressional wetlands in differing land uses in Florida, USA

Nitrous oxide production and consumption by denitrification in a grassland: Effects of grazing and hydrology

Eutrophication: Status, Trends and Restoration Strategies for Palic Lake

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