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  • 1
    Electronic Resource
    Electronic Resource
    Phosphorus in a model pond study:II. Sediment fertility and water concentrations (1979)
    Springer
    Hydrobiologia 63 (1979), S. 99-104 
    Details
    ISSN: 1573-5117
    Keywords: Fertilizer ; Nutrients ; Soluble Phosphate ; Pond ; Sediment ; Erosion ; Najas ; Charales ; Potamogeton ; Phosphate Transport ; Phosphate Fixation ; Sediment phosphate uptake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two surfaces soils with contrasting physical and chemical characteristics were placed in model ponds to provide a sediment phosphate (P) source. Water samples were obtained weekly or biweekly and analyzed for total, total soluble, and soluble reactive P. Fertilizer P additions which exceeded sediment P absorption capacity occasionally tended to produce significantly higher P concentrations. Smaller P additions had no influence on pond P concentrations and no relationship between pond P concentrations and sediment EPC values was found. Soluble reactive P concentrations in most of the ponds were similar and seldom 〉 5 µg/1. Two mechanisms significantly affected P transport from the sediments. The first were macrophytic plants which provided a large P sink in the water column. The second was fixation of readily soluble P within the sediments. Plant growth within the ponds used 〈 5% of the readily soluble P initially present. Diffusion of P from the sediments did not support large SRP concentrations within the ponds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00030072
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Phosphorus in a model pond study: I sediment selection and preparation (1979)
    Springer
    Hydrobiologia 63 (1979), S. 11-15 
    Details
    ISSN: 1573-5117
    Keywords: Fertilizer ; Nutrients ; Soluble Phosphate ; Equilibrium Phosphate Concentration ; Phosphorus ; Pond ; Sediment ; Erosion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We chose two surface soils with contrasting textures as model sediments for a model pond study. One soil, a calcareous clay, had a relatively high natural phosphate content and a large phosphate adsorption capacity. The second soil, a non calcareous loam, had a relatively low natural phosphate content and a small phosphate adsorption capacity. Chemical characteristics of both soils were roughly proportional to mineral surface area. Pasture sites of each soil were tilled to a depth of 15 cm and two plots at each site were fertilized by hand with triple superphosphate. A third plot at each site was left unfertilized. After fertilization the plots were mechanically mixed and left fallow for 2 to 3 months. Then the plots were resampled and equilibration phosphate concentrations were determined again. Results showed significant phosphate fixation by the clay soil but no fixation by the loam soil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00021012
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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