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Titre :
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Phosphorus storage capacity of uplands, wetlands and streams of the lake Okeechobee watershed, Florida
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Auteurs :
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K. Reddy ;
E. Flaig ;
D. Graetz
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Type de document :
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article/chapitre/communication
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Année de publication :
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1996
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Format :
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p. 203-216
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Langues:
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= Anglais
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Catégories :
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EAU
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Mots-clés:
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LAC
;
EUTROPHISATION
;
POLLUTION D'ORIGINE AGRICOLE
;
PHOSPHORE
;
BASSIN VERSANT
;
ZONE HUMIDE
;
CAPACITE DE RETENTION
;
SOL
;
SEDIMENT
;
COURS D'EAU
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Résumé :
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Lake Okeechobee, a subtropical, shallow lake in south Florida, is severely affected from eutrophication resulting from non-point source agricultural phosphorus (P) loading. The Lower Kissimmee River and Taylor Creek/Nubbin Slough watersheds are major contributors of P to Lake Okeechobee with 57% of the total P load attributed to these two watersheds. Major land use in these watersheds are dairy and beef pastures. Soils are dominated by Spodosols. The P storage capacity of uplands, wetlands and streams in the Lake Okeechobee Watershed was estimated based on the analysis of soil and vegetation, and imports of P into the watershed. Results showed that about 70% of the total P imported into the watershed is stored in uplands, and an additional 18% is stored in wetlands and streams. Phosphorus retention in soils was strongly associated with Al and Fe oxides and total organic carbon.
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Source :
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Agriculture Ecosystems & Environment, vol. 59
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