Chemistry and microbiology of newly flooded soils: relationship to reservoir-water quality

Gunnison, Douglas; Engler, Robert M.; Patrick, W. H.

doi:10.1007/978-94-009-5514-1_3

Cited by 10 publications

(8 citation statements)

References 44 publications

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“…This phenomenon is caused by direct leaching and biological release of nutrients, particularly phosphorus, from flooded vegetation and soil (Grimard & Jones, 1982 ;Gunnison et al, 1985) . This phase in a new reservoir is followed by a decline and return to a stabilized trophic state and is referred to as trophic depression.…”

Section: Discussionmentioning

confidence: 99%

Phytoplankton and zooplankton population dynamics and production of a recently formed African reservoir

et al. 1992

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The study provides a 2 .5 year record of Rhenosterkop Dam (KwaNdebele, South Africa) plankton population dynamics and production in relation to physical and chemical changes which occurred during the trophic depression and stabilization phases of the reservoir . The mean volume of the reservoir was 4 % of full storage capacity . Water temperatures ranged from 14 ° C to 27 'C . Due to inorganic suspensoids, the euphotic zone averaged 2 .6 m . An anaerobic zone developed each summer . The nitrogen, soluble reactive phosphorus (SRP) and silica concentrations did not display a seasonal pattern, but the latter two nutrients declined over the study . The dominant phytoplankton group was the cryptophytes while the zooplankton population was dominated by crustaceans . Chlorophyll a concentrations ranged from 1 .1 to 27 mg m-3 and were positively correlated to silica and SRP concentrations and inversely with NH 4-N concentrations . Primary production ranged from 22 .6 to 375 mgC m -2 h-' ; changes in A,,, a, were positively correlated to silica and SRP concentrations . Total zooplankton dry weight biomass varied from < 0 .5 to > 4 mg I -' . Annual zooplankton (secondary) production was 8 to -15 gC m -3 a -'; both primary and secondary production were greatest in the first 12 months of study and remained at low levels for the remainder, similar to the trends for silica and SRP . The data indicate that the reservoir shifted from eutrophic to mesotrophic during the study, typical of events in new reservoirs, and that changes in the plankton populations were largely the result of changing nutrient concentrations .Introduction 1990). Groundwater resources are limited and the surface waters are relied upon for urban, indusThe majority of water resources in southern Aftrial and agricultural purposes . Irrigation is the rica are riverine and south of the Zambezi River major use of surface waters in this region, adding there are very few natural lakes (Allanson et al., to the load placed on limited surface resources

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Section: Discussionmentioning

confidence: 99%

Phytoplankton and zooplankton population dynamics and production of a recently formed African reservoir

et al. 1992

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“…When loading rates of sediment and nutrients into a basin are high, these processes may exhaust the available oxygen supply before all of the incoming material can be decomposed . If the available oxygen is consumed, an accumulation of ammonianitrogen also follows (Gunnison et al .,1985) . A lack of oxygen prohibits benthic bacteria from oxidizing ammonia to nitrite-nitrogen and eventually nitratenitrogen .…”

Section: Benthic Invertebrate Compositionmentioning

confidence: 99%

Changes in benthic community composition in response to reservoir aging

Popp

Hoagland

1995

Hydrobiologia

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“…The soils redox potential decreases. Reduced species accumulate either as soluble components or as precipitated compounds within the soil matrix (Gunnison et al, 1985). Alemi et.…”

Section: List Of Tablesmentioning

confidence: 99%

Selenium Immobilization in a Pond Sediment at Kesterson Reservoir

et al. 1990

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Kesterson Reservoir, Merced County, CA, a disposal facility for agricultural drain water, became the object of intense scientific investigation following discovery in 1983 that Se‐laden agricultural drain water was having serious effects on the reproductive success of waterfowl. A remedial measure involving permanent flooding with low‐Se water, aimed at taking advantage of low Se solubility under reducing conditions, was proposed as a means of limiting Se movement into groundwater and biota. A field experiment was undertaken to evaluate the feasibility of the proposed remedial measure, its impact on the quality of shallow groundwater and for quantifying Se immobilization and transport through a newly flooded pond bottom soil. Extensive soil water and groundwater sampling demonstrated that although initial soluble Se concentrations in the top 1.22 m (4 ft) of soil typically ranged from approximately 1000 to 3000 µg L−1, Se concentrations declined dramatically after flooding and elevated concentrations below 1.22 m were observed at only one of five sampling sites. Analysis of the temporal and spatial changes in the distribution of dissolved Se and Cl− indicated that 66 to 108% of the initial soluble Se present in the top 1.22 m was immobilized shortly after flooding. These estimates were consistent with the low Se concentrations observed in shallow monitoring wells. The extent to which Se immobilization occurred correlated inversely with average pore water velocity. Data presented suggest that reducing conditions in the newly flooded soils lead to the microbially mediated transformation of selenate to less soluble or mobile forms.

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Chemistry and microbiology of newly flooded soils: relationship to reservoir-water quality

Cited by 10 publications

References 44 publications

Phytoplankton and zooplankton population dynamics and production of a recently formed African reservoir

Phytoplankton and zooplankton population dynamics and production of a recently formed African reservoir

Changes in benthic community composition in response to reservoir aging

Selenium Immobilization in a Pond Sediment at Kesterson Reservoir

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