Dissolved organic matter and lake metabolism: Biogeochemistry and controls of nutrient flux dynamics in lakes: Technical progress report, 1 July 1986-30 June 1987

Technical Report · Thu Jan 01 04:00:00 EST 1987

OSTI ID:6417979

Wetzel, R G

Most lakes are small and possess large littoral and wetland components in the interface region between the open water per se and the drainage basin. Not only does the photosynthetic productivity of the surrounding littoral-wetland complex vastly exceed that of the pelagic zone, but the littoral-wetland vegetation and its intensive synthesis and decompositional metabolism regulate loading of inorganic nutrients passing to the open water (functioning as pulsed sources and sinks), and regulate loading of dissolved organic matter and particulate organic matter to the recipient open water, which by numerous complex pathways and mechanisms enhance or suppress pelagic productivity. Research emphasis was placed on the sources, fates, and interactions of dissolved and particulate organic matter in relation to inorganic chemical cycling: allochthonous loading to the lake system; and the coupled nutrient physiology and metabolism of phytoplankton, bacterial populations, macrophytes and attendant sessile algal-bacterial communities. Regulatory mechanisms of growth and rates of carbon and nutrient cycling were evaluated among the inorganic-organic influxes of allochthonous sources as they are controlled by wetland-littoral communities, the littoral photosynthetic producer-decomposer complex, the microflora of the sediment-water interface, and the microflora of the pelagic zone. 28 refs., 13 figs., 2 tabs.

• Research Organization: Michigan Univ., Ann Arbor (USA). Dept. of Biology
• DOE Contract Number: FG02-87ER60515
• OSTI ID: 6417979
• Report Number(s): DOE/ER/60515-1-Pt.1; COO-1599-308-Pt.1; ON: DE87012142
• Country of Publication: United States
• Language: English

Related Subjects

520101* -- Environment
Aquatic-- Basic Studies-- Radiometric Techniques-- (-1989)
54 ENVIRONMENTAL SCIENCES
ALGAE
AMMONIUM COMPOUNDS
AQUATIC ECOSYSTEMS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BIOGEOCHEMISTRY
CHEMISTRY
DAYS LIVING RADIOISOTOPES
ECOSYSTEMS
ELEMENTS
ENERGY BUDGETS
GEOCHEMISTRY
INTERFACES
ISOTOPE APPLICATIONS
ISOTOPES
LAKES
LIGHT NUCLEI
LIMNOLOGY
METABOLISM
MINERAL CYCLING
NONMETALS
NUCLEI
NUTRIENTS
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
ORGANIC MATTER
PH VALUE
PHOSPHORUS
PHOSPHORUS 32
PHOSPHORUS 33
PHOSPHORUS ISOTOPES
PLANTS
PRODUCTIVITY
RADIOISOTOPES
RECYCLING
SEASONAL VARIATIONS
SEDIMENT-WATER INTERFACES
SURFACE WATERS
TRACER TECHNIQUES
VARIATIONS