Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/37198
COMPARTIR / EXPORTAR:
SHARE CORE BASE | |
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Título: | Hierarchy, spatial cofiguration, and nutrient cycling in a desert stream |
Autor: | Fisher, S. G.; Grimm, Nancy B. CSIC ORCID; Martí, Eugènia ; Gómez, R. | Palabras clave: | Hierarchy Hydrology Nitrogen Nutrients Patch dynamics Scale Spatial configuration streams |
Fecha de publicación: | 1998 | Editor: | John Wiley & Sons | Citación: | Australian Journal of Ecology 23 : 41-52 (1998) | Resumen: | Recent studies of nutrient cycling in Sycamore Creek in Arizona, USA, suggest that a thorough understanding requires a spatially explicit, hierarchical approach. Physical configuration determines the path that water follows as it moves downstream. Water follows flowpaths through surface stream components, the hyporheic zone beneath the surface stream, and the parafluvial (sand bar) zone. Characteristic biogeochemical processes in these subsystems alter nitrogen (N) species in transport, in part as a function of available concentrations of N species. At several hierarchical levels, substrate materials are an important determinant of nitrogen dynamics in desert streams. Sand is present in bars of variable size and shape, each of which can be considered a unit, interacting with the surface stream. Groups of these stream-sandbar units form a higher level, the reach. At the next higher scale, sandy reaches (runs) alternate with riffles. Where flowpaths converge, rates of N transformation are high and, as a result, change in concentration is a non-linear function of fiowpath length. Disturbance by flash floods alters sandbar configuration. Between floods, the interaction of subsurface and surface flowpaths shapes configuration in each, thus a self-organizing element of spatial structure exists. Sandy runs are dominated by subsurface processes and are likely to be net nitrifiers while riffles are dominated by surface flow and are nitrogen fixers. Whether a stream ecosystem retains nitrogen, or transports it to downstream recipient systems, or is a net emitter of gaseous forms of N, depends upon the dynamics of a spatial mosaic of interacting elements. An understanding of the net effect of this mosaic requires a spatially e.xplicit, hierarchical, multi-scale approach. | Descripción: | 12 páginas ; 9 Figuras ; 3 Tablas | Versión del editor: | http://dx.doi.org/10.1111/j.1442-9993.1998.tb00704.x | URI: | http://hdl.handle.net/10261/37198 | DOI: | 10.1111/j.1442-9993.1998.tb00704.x | ISSN: | 0307-692X |
Aparece en las colecciones: | (CEAB) Artículos |
Mostrar el registro completo
CORE Recommender
SCOPUSTM
Citations
78
checked on 22-abr-2024
WEB OF SCIENCETM
Citations
69
checked on 23-feb-2024
Page view(s)
283
checked on 24-abr-2024
Google ScholarTM
Check
Altmetric
Altmetric
NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.