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| Titel |
Forms of organic phosphorus in wetland soils |
| VerfasserIn |
A. W. Cheesman, B. L. Turner, K. R. Reddy |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 11, no. 23 ; Nr. 11, no. 23 (2014-12-04), S.6697-6710 |
| Datensatznummer |
250117711
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| Publikation (Nr.) |
 copernicus.org/bg-11-6697-2014.pdf |
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| Zusammenfassung |
| Phosphorus (P) cycling in freshwater wetlands is dominated by
biological mechanisms, yet there has been no comprehensive
examination of the forms of biogenic P (i.e., forms derived from
biological activity) in wetland soils. We used solution
31P NMR spectroscopy to identify and quantify P forms in
surface soils of 28 palustrine wetlands spanning a range of
climatic, hydrogeomorphic, and vegetation types. Total P
concentrations ranged between 51 and 3516 μg P g-1,
of which an average of 58% was extracted in a single-step
NaOH–EDTA procedure. The extracts contained a broad
range of P forms, including phosphomonoesters (averaging 24% of
the total soil P), phosphodiesters (averaging 10% of total P),
phosphonates (up to 4% of total P), and both pyrophosphate and
long-chain polyphosphates (together averaging 6% of total
P). Soil P composition was found to be dependant upon two key
biogeochemical properties: organic matter content and pH. For example,
stereoisomers of inositol hexakisphosphate were detected exclusively
in acidic soils with high mineral content, while phosphonates were
detected in soils from a broad range of vegetation and
hydrogeomorphic types but only under acidic conditions. Conversely
inorganic polyphosphates occurred in a broad range of wetland soils,
and their abundance appears to reflect more broadly that of a
"substantial" and presumably active microbial community with
a significant relationship between total inorganic polyphosphates
and microbial biomass P. We conclude that soil P composition varies
markedly among freshwater wetlands but can be predicted by
fundamental soil properties. |
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