Phosphorus and sediment transfers in a grassland river catchment

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

The Oona Water (102 km(2)) is a tributary of the Blackwater River (1,480 km(2)), an Irish cross border catchment and the largest of the six influent rivers to Lough Neagh. An intensive investigation into the magnitude of phosphorus and sediment transfers from field (0.15 km(2)), farm (0.62 km(2)) and landscape (84.50 km(2)) scale sub-catchments showed that total phosphorus transfers were 1.73, 1.82 and 2.50 kg/ha, respectively, during the 2001-2002 hydrological year. Two important features of these data were noted. Firstly, higher transfers from the landscape scale sub-catchment were related to phosphorus inputs between storm events. These were mainly in the soluble form and maintained the river in a hypertrophic state during low flow despite there being no major point source discharges in the catchment. A mass P balance estimate of all domestic wastewater effluents indicated that this is a minor source but may have major impacts at extreme low flows. Secondly, despite the Oona Water being a grassland catchment the main phosphorus fraction recorded was in the particulate form (> 50%) and strongly correlated with suspended sediments (SSs), manganese and iron during both storm and non-storm periods. Previous Irish studies have indicated that the main edge-of-field phosphorus transfers from grassland soils are in the soluble form. While erosive overland flow cannot be ruled out from soils of low permeability in the Oona Water, it is also likely that soluble P is entrained to equilibrium by manganese and iron rich SSs from multiple sources that will include stream bank and bed sediments.
LanguageEnglish
Pages199-212
JournalNutrient Cycling in Agroecosystems
Volume77
Issue number3
DOIs
Publication statusPublished - Mar 2007

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grassland
catchment
phosphorus
river
sediment
low flow
suspended sediment
manganese
iron
grassland soil
overland flow
water
point source
tributary
farm
permeability
effluent
wastewater
soil

Keywords

  • phosphorus
  • suspended sediments
  • manganese
  • iron
  • catchments

Cite this

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abstract = "The Oona Water (102 km(2)) is a tributary of the Blackwater River (1,480 km(2)), an Irish cross border catchment and the largest of the six influent rivers to Lough Neagh. An intensive investigation into the magnitude of phosphorus and sediment transfers from field (0.15 km(2)), farm (0.62 km(2)) and landscape (84.50 km(2)) scale sub-catchments showed that total phosphorus transfers were 1.73, 1.82 and 2.50 kg/ha, respectively, during the 2001-2002 hydrological year. Two important features of these data were noted. Firstly, higher transfers from the landscape scale sub-catchment were related to phosphorus inputs between storm events. These were mainly in the soluble form and maintained the river in a hypertrophic state during low flow despite there being no major point source discharges in the catchment. A mass P balance estimate of all domestic wastewater effluents indicated that this is a minor source but may have major impacts at extreme low flows. Secondly, despite the Oona Water being a grassland catchment the main phosphorus fraction recorded was in the particulate form (> 50{\%}) and strongly correlated with suspended sediments (SSs), manganese and iron during both storm and non-storm periods. Previous Irish studies have indicated that the main edge-of-field phosphorus transfers from grassland soils are in the soluble form. While erosive overland flow cannot be ruled out from soils of low permeability in the Oona Water, it is also likely that soluble P is entrained to equilibrium by manganese and iron rich SSs from multiple sources that will include stream bank and bed sediments.",
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Phosphorus and sediment transfers in a grassland river catchment. / Douglas, Richard; Menary, Wayne; Jordan, Philip.

Vol. 77, No. 3, 03.2007, p. 199-212.

Research output: Contribution to journalArticle

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AB - The Oona Water (102 km(2)) is a tributary of the Blackwater River (1,480 km(2)), an Irish cross border catchment and the largest of the six influent rivers to Lough Neagh. An intensive investigation into the magnitude of phosphorus and sediment transfers from field (0.15 km(2)), farm (0.62 km(2)) and landscape (84.50 km(2)) scale sub-catchments showed that total phosphorus transfers were 1.73, 1.82 and 2.50 kg/ha, respectively, during the 2001-2002 hydrological year. Two important features of these data were noted. Firstly, higher transfers from the landscape scale sub-catchment were related to phosphorus inputs between storm events. These were mainly in the soluble form and maintained the river in a hypertrophic state during low flow despite there being no major point source discharges in the catchment. A mass P balance estimate of all domestic wastewater effluents indicated that this is a minor source but may have major impacts at extreme low flows. Secondly, despite the Oona Water being a grassland catchment the main phosphorus fraction recorded was in the particulate form (> 50%) and strongly correlated with suspended sediments (SSs), manganese and iron during both storm and non-storm periods. Previous Irish studies have indicated that the main edge-of-field phosphorus transfers from grassland soils are in the soluble form. While erosive overland flow cannot be ruled out from soils of low permeability in the Oona Water, it is also likely that soluble P is entrained to equilibrium by manganese and iron rich SSs from multiple sources that will include stream bank and bed sediments.

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