Links between N deposition and nitrate export from a high-elevation watershed in the Colorado Front Range.
Environ Sci Technol
; 48(24): 14258-65, 2014 Dec 16.
Article
en En
| MEDLINE
| ID: mdl-25383864
ABSTRACT
Long-term patterns of stream nitrate export and atmospheric N deposition were evaluated over three decades in Loch Vale, a high-elevation watershed in the Colorado Front Range. Stream nitrate concentrations increased in the early 1990 s, peaked in the mid-2000s, and have since declined by over 40%, coincident with trends in nitrogen oxide emissions over the past decade. Similarities in the timing and magnitude of N deposition provide evidence that stream chemistry is responding to changes in atmospheric deposition. The response to deposition was complicated by a drought in the early 2000s that enhanced N export for several years. Other possible explanations, including forest disturbance, snow depth, or permafrost melting, could not explain patterns in N export. Our results show that stream chemistry responds rapidly to changes in N deposition in high-elevation watersheds, similar to the response observed to changes in sulfur deposition.
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Movimientos del Agua
/
Altitud
/
Nitratos
/
Nitrógeno
País/Región como asunto:
America do norte
Idioma:
En
Revista:
Environ Sci Technol
Año:
2014
Tipo del documento:
Article
País de afiliación:
Estados Unidos