Dynamic phosphorus mass balance modeling of large watersheds: long-term implications of management strategies
| Autor: | S.G. Aschmann, D. P. Anderson, E. A. Cassell, J. M. Dorioz, D. W. Meals, R. L. Kort |
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| Přispěvatelé: | Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL), Institut National de la Recherche Agronomique (INRA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), ProdInra, Migration |
| Rok vydání: | 2001 |
| Předmět: |
Environmental Engineering
Watershed 010504 meteorology & atmospheric sciences Process (engineering) 010501 environmental sciences 01 natural sciences Ecosystem [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology ComputingMilieux_MISCELLANEOUS 0105 earth and related environmental sciences Water Science and Technology 2. Zero hunger business.industry Environmental engineering TRAITEMENT DES EAUX USEES 15. Life on land TRANSFERT DU PHOSPHORE 6. Clean water Watershed management Balance (accounting) Agriculture [SDU.STU.HY] Sciences of the Universe [physics]/Earth Sciences/Hydrology Environmental science Water resource management business Eutrophication Futures contract |
| Zdroj: | Water Science and Technology Water Science and Technology, IWA Publishing, 2001, 43 (5), pp.153-162 |
| ISSN: | 1996-9732 0273-1223 |
| Popis: | The principles of mass balance, compartment-flux diagramming, and dynamic simulation modeling are integrated to create computer models that estimate phosphorus (P) export from large-scale watersheds over long-term futures. These Watershed Ecosystem Nutrient Dynamics (WEND) models are applied to a 275,000 ha dairy-documented watershed and a 77,000 ha poultry-dominated watershed in northeastern USA. Model predictions of present-day P export loads are consistent with monitoring data and estimates made using P export coefficients. For both watersheds P import exceeds P export and P is accumulating in the agricultural soils. Agricultural and urban activities are major contributors to P export from both watersheds. Continued urban growth will increase P export over time unless wastewater management is substantially enhanced and/or rates of urban growth are controlled. Agriculture cannot rely solely on the implementation of increasingly stringent conservation practices to reduce long-term P export but mustconsider options that promote P input/output balance. The WEND modeling process is a powerful tool to integrate the diversity of activities in watersheds into a holistic framework. Model outputs are suited to assist managers to explore long-term effects of overall watershed management strategies on P export in comparison to environmental and economic goals. |
| Databáze: | OpenAIRE |
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