ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • phosphorus
  • Springer  (8)
  • 1975-1979  (8)
  • 1
    Electronic Resource
    Electronic Resource
    A geochemical model for evaluating theories on the genesis of Florida's sedimentary phosphate deposits (1976)
    Springer
    Mathematical geology 8 (1976), S. 219-242 
    Details
    ISSN: 1573-8868
    Keywords: analog computer ; simulation ; geochemistry ; phosphorus ; phosphate deposits
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Mathematics
    Notes: Abstract Present ionic concentrations of Ca ++,HCO 3 - ,and HPO 4 = in surface and groundwater runoff in Florida indicate that phosphorus is being concentrated in rock through dissolution and reprecipitation, with calcium phosphate increasing at the expense of calcium carbonate. Analog computer simulation of a systems model of this process suggests that significant enrichment can occur in 20 million years. The degree of enrichment depends on the supply of new phosphorus to Florida through rain and oceanic exchange processes. If the calcium phosphate content of original rock is 0.5 to 1.0 percent (0.52 to 1.05 percent P 2 O 5),a formation with 10 to 20 percent calcium phosphate (CaPO 4 or 10.5 to 21.0 percent P 2 O 5)as in the Hawthorn Formation (Miocene)may result. Nutrient upwelling along the continental slope coupled with transport to the estuaries by lateral eddy diffusion can supply an additional 400 mg P|m 2 |yr which, if deposited, would result in a sediment with a 4.3 percent CaPO 4 (4.5 percent P 2 O 5)content. If this is enriched later by resolution, 40 percent CaPO 4 (42 percent P 2 O 5)results. Through geologic time, the ocean may be considered as a source of phosphorus to the land through rain or estuarine sediment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01029271
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Evaluation of A resin-bag procedure for determining plant-available P in organic, volcanic soils (1979)
    Springer
    Plant and soil 53 (1979), S. 245-249 
    Details
    ISSN: 1573-5036
    Keywords: Ion-exchange ; nethod Organic ; soil Plant-available ; phosphorus ; Sub-antarctic ; soils
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary An anion-exchange procedure in which soil samples are shaken with polyester-netting bags containing a strongly basic resin has proved to be the only method too date which yields reproducible ‘plantavailable’ P estimates on Marion Island soils. Available P determinations using chemical extractants are hampered by high iron, aluminium and organic matter contents in these soils. Resin-extractable soil P levels correlated strongly with plant leaf P contents at a wide variety of sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181897
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Nutrient limitation of phytoplankton in a central Arizona reservoir (1976)
    Springer
    Hydrobiologia 51 (1976), S. 219-224 
    Details
    ISSN: 1573-5117
    Keywords: nutrients ; nutrient limitation ; phytoplankton ; phosphorus ; nitrogen ; carbon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The influence of added nutrients nitrogen, phosphorus and carbon on the phytoplankton of a small recreational reservoir in central Arizona was investigated during the summer, 1974. Polyethylene bags were used to isolate lake water and the natural populations for the addition of nitrogen, phosphorus and carbon individually and in combination. A large increase in phytoplankton numbers, extractable chlorophyll, pH and dissolved oxygen occurred only in bags to which both nitrogen and phosphorus were added, suggesting that both nitrogen and phosphorus levels were limiting to the primary producers. Little alteration in species composition resulted from the addition of the above nutrients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00005747
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Particle size, percent organic carbon, phosphorus, mineralogy, and deposition of sediments in Ham's and Arbuckle lakes (1979)
    Springer
    Hydrobiologia 65 (1979), S. 33-38 
    Details
    ISSN: 1573-5117
    Keywords: sediments ; particle size ; percent organic carbon ; phosphorus ; sedimentation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Several sediment parameters were examined in a 40 ha lake with a maximum depth of 9 m and in a 950 ha lake, 26 m deep, from May through October, 1977. Particle size was finer at the deeper stations than at the shallower stations in both lakes. Sediments of the shallow stations generally had a more even grain size distribution. Variation in percent organic carbon and phosphorus among stations of different depths was not significant. However, temporal variation of phosphorus was significant as values increased during summer. Kaolinite was the dominant clay particle in both lakes, but the sediments also included quartz, mica, montmorillonite, and a montmorillonite-vermiculite interlayer. Sedimentation rate was inversely related to depth in the larger lake, while variation among stations in the smaller lake was slight.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032716
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Phytoplankton production and phosphorus supply in Cayuga Lake (1968–1973) (1977)
    Springer
    Hydrobiologia 54 (1977), S. 113-127 
    Details
    ISSN: 1573-5117
    Keywords: primary production ; phosphorus ; zooplankton phosphorus release ; phosphorus loading ; 14C uptake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The average annual rate of carbon production in Cayuga Lake, New York, was determined by 14C uptake and by a phosphorus supply method. The rate of phosphorus supply was converted to units of carbon production using observed sestonic C : P ratios. The two methods gave good agreement and annual carbon production was estimated to be 130 gC m−2 yr−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00034985
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Trophic status of Iowa Lakes in relation to origin and glacial geology (1978)
    Springer
    Hydrobiologia 57 (1978), S. 267-273 
    Details
    ISSN: 1573-5117
    Keywords: Eutrophication ; Iowa lakes ; phosphorus ; water chemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Natural and artificial lakes in the most recently glaciated portions of Iowa have significantly greater total ion concentrations than those in other areas of the state. A similar distribution was found for total nitrogen concentrations. Lake origin seems of greater importance than location in determining trophic state. As a group, the artificial lakes have lower concentrations of total phosphorus, total chlorophyll, and greater Secchi disk transparency than do the natural lakes. This seems related to differences in the dynamics of the phosphorus cycles in these lake types.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00014580
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Chemical composition studies on some aquatic macrophytes in three Scottish lochs. I. Chlorophyll, ash, carbon, nitrogen and phosphorus. (1979)
    Springer
    Hydrobiologia 63 (1979), S. 161-166 
    Details
    ISSN: 1573-5117
    Keywords: Chemical composition studies ; chlorophyll content ; carbon ; nitrogen ; phosphorus ; freshwater macrophytes ; Scottish lochs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The chlorophyll, ash, carbon, nitrogen and phosphorus levels in seven species of freshwater macrophytes (Juncus effusus L., Iris pseudacorus L., Carex rostrata Stokes, Glyceria maxima (Hartm.) Holmberg, Nuphar lutea (L) Sm., Polygonum amphibium L. and Schoenoplectus lacustris (L) Pallas) in three Scottish lochs of different trophic levels were studied during 1975. Mean chlorophyll levels varied from a minimum of 1.73 mg g−1 dry weight in Balgavies Loch Juncus to 10.22 mg g−1 dry weight for Forfar Loch Iris. Carbon contents ranged from 450 to 520 mg g−1 ash-free dry weight. For ash, nitrogen and phosphorus, significant differences in mean concentrations were detected among plant species as well as within one plant species growing in different lochs. Positive correlations were apparent between the degree of eutrophication in the study areas and the amount of ash, phosphorus and nitrogen present in the plants growing in them.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00030079
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    The influence of chironomus plumosus larvae on the exchange of dissolved substances between sediment and water (1979)
    Springer
    Hydrobiologia 66 (1979), S. 149-159 
    Details
    ISSN: 1573-5117
    Keywords: Chironomus ; sediment ; exchange ; nitrogen ; phosphorus ; silica ; iron ; manganese
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract 4th instar Chironomus plumosus larvae (about 1000·m−2) were added to tubes containing sediment and overlying water. At a temperature of 20°C the larvae greatly increased the trasnport of silica, phosphorus and iron from the sediment to the water. Oxygen concentrations did not influence the exchange of silica. For two non-calcareous sediments the exchange of phosphorus and iron was much higher under anaerobic than under aerobic conditions while the difference was small for sediment from a hardwater lake. Exchange of inorganic nitrogen was little influenced by added chironomid larvae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00032045
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...