Halting the Upward Trend in Soluble Phosphorus Transported from a Grassland Catchment
| Autor: | S. D. Lennox, R. V. Smith, J. S. Bailey |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Environmental Engineering
Watershed Drainage basin Liquid manure chemistry.chemical_element Fresh Water Northern Ireland Management Monitoring Policy and Law Grassland Animal science Nutrient Water Movements Humans Soil Pollutants Waste Management and Disposal Water Science and Technology Hydrology geography geography.geographical_feature_category Phosphorus Water Pollution Pollution Trend analysis chemistry Environmental science Eutrophication Water Pollutants Chemical |
| Zdroj: | Journal of Environmental Quality. 32:2334-2340 |
| ISSN: | 0047-2425 |
| Popis: | An upward trend in soluble reactive phosphorus (SRP) concentrations in Northern Ireland rivers leading to increased eutrophication has been reported for the last two decades. To identify if a similar trend could be observed in land drainage waters SRP and other P fractions were measured weekly from 1989 to 1997 in land drainage from a 9-ha grassland catchment in Northern Ireland that had a mean P surplus applied of 23.4 kg P ha(-1) yr(-1). Regressions of annual median concentrations of P fractions in land drainage waters against time for 1989 through to 1997 showed significant increases of SRP and soluble unreactive phosphorus (SUP) of 2.4 and 1.2 microg P L(-1) yr(-1), respectively. However, the annual flow-weighted concentrations and loads of all P fractions did not show significant increases with time. During the period 1998-2000 a change of management was introduced when only maintenance dressings of P were applied to the catchment according to Ministry of Agriculture, Fisheries and Food guidelines. This resulted in significant reductions in SRP concentrations in 2000 compared with 1997. |
| Databáze: | OpenAIRE |
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