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| Titel |
Phosphorus contents and availability of technogenic substrates for soil construction |
| VerfasserIn |
Thomas Nehls, Paetsch Lydia, Sarah Rokia, Christophe Schwartz, Gerd Wessolek |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250097005
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| Publikation (Nr.) |
 EGU/EGU2014-16292.pdf |
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| Zusammenfassung |
| Urban areas lack of green and of soil substrates to support this green. A great variety of solid
waste materials can be seen as technogenic substances (TS) for the construction of
soil-similar plant substrates. Biomass production in the city and the use of waste materials as
nutrient sources can help to close regional nutrient cycles.
The most important waste materials have been studied for their phosphorus contents,
availabilities and diffusion rates in the rhizosphere by combining their analyzed chemical and
physical properties.
Compost, concrete, green wastes, paper mill sludge, street-sweepings, mix of rubble,
bricks, track ballasts and charcoal have (i) been analyzed their P release properties (HF
extraction, Olsen-P, adsorption isotherms); (ii) the physical properties (water retention
function, saturated hydraulic conductivity) were analyzed at 80 % of the proctor density; (iii)
The P availability of the TMs to the roots were simulated for different pressure heads
(pF = 1.3, 1.8 and 3.0) using HYDRUS 1-D. We compared the results for TS with
these for agricultural soils. Ptot varies from 710 to 21 000 mg kg-1 for bricks and
compost, while POlsen varies from 19 to 1 090 mg kg-1 for charcoal and green
wastes. The diffusion rates of TSs (pF = 1.3) are up to 10 times higher compared to
those of soils, with green wastes showing highest and bricks the lowest P diffusion
rates.
We conclude that the investigated TS are appropriate for construction of soil similar
planting substrates because of their P delivery potential and their favourable physical
properties. |
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