Nutrient dynamics of freshwater riverine marshes and the role of emergent macrophytes
Conference
·
OSTI ID:5160566
The open characteristics of freshwater riverine marshes result in a continual subsidy and withdrawal of nutrients, with the specific patterns within any wetland being dependent on seasonal hydrological fluctuations and biological activity. One of the key features of the marsh separating it from terrestrial ecosystems is its inundated and anaerobic soils which show significant (P > 0.01) seasonal variations in available P and K and exchangeable Ca and Mg. Based primarily on investigations in Wisconsin, the role of emergent macrophytes within the marsh nutrient cycle is described. Concentrations of N, P, K, Ca, and Mg are shown to follow predictable trends over the growing season. However, the accumulation of these elements in the below and aboveground structures is shown to yield a more complete picture of the functional role of emergent macrophytes. Regression analyses showed nutrient uptake by the macrophytes was significantly correlated (r/sup 2/ = 0.98, P > 0.01) to total soil N and available P. For the most part, significant correlations were not shown for the other elements and is explained based upon their mobility and the possibility of luxury uptake. Models of the flow of nutrients in a Scirpus fluviatilis stand are depicted.
- Research Organization:
- Oak Ridge National Lab., Tenn. (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 5160566
- Report Number(s):
- CONF-770248-1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
520100* -- Environment
Aquatic-- Basic Studies-- (-1989)
54 ENVIRONMENTAL SCIENCES
ALGAE
ALKALI METALS
ALKALINE EARTH METALS
AQUATIC ECOSYSTEMS
AQUATIC ORGANISMS
BIOLOGICAL ACCUMULATION
BIOMASS
CALCIUM
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
DENITRIFICATION
ECOSYSTEMS
ELEMENTS
ENERGY SOURCES
FLUIDS
FRESH WATER
HYDROGEN COMPOUNDS
MAGNESIUM
MARSHES
METALS
MOTION
NITROGEN
NONMETALS
NUTRIENTS
OXYGEN COMPOUNDS
PHOSPHORUS
PLANTS
POLLUTION CONTROL
POTASSIUM
RENEWABLE ENERGY SOURCES
RETENTION
RIVERS
SODIUM
SOILS
STREAMS
SURFACE WATERS
UPTAKE
WATER
WATER POLLUTION CONTROL
Aquatic-- Basic Studies-- (-1989)
54 ENVIRONMENTAL SCIENCES
ALGAE
ALKALI METALS
ALKALINE EARTH METALS
AQUATIC ECOSYSTEMS
AQUATIC ORGANISMS
BIOLOGICAL ACCUMULATION
BIOMASS
CALCIUM
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
DENITRIFICATION
ECOSYSTEMS
ELEMENTS
ENERGY SOURCES
FLUIDS
FRESH WATER
HYDROGEN COMPOUNDS
MAGNESIUM
MARSHES
METALS
MOTION
NITROGEN
NONMETALS
NUTRIENTS
OXYGEN COMPOUNDS
PHOSPHORUS
PLANTS
POLLUTION CONTROL
POTASSIUM
RENEWABLE ENERGY SOURCES
RETENTION
RIVERS
SODIUM
SOILS
STREAMS
SURFACE WATERS
UPTAKE
WATER
WATER POLLUTION CONTROL