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| Titel |
Using 31P-NMR to investigate dynamics of soil phosphorus compounds in the Rothamsted Long Term Experiments |
| VerfasserIn |
Martin Blackwell, Ben Turner, Steve Granger, Tony Hooper, Tegan Darch, Jane Hawkins, Huimin Yuan, Steve McGrath |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250111677
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| Publikation (Nr.) |
 EGU/EGU2015-11818.pdf |
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| Zusammenfassung |
| The technique of 31P-NMR spectroscopy has done more to advance the knowledge of
phosphorus forms (especially organic phosphorus) in environmental samples than any other
method. The technique has advanced such that specific compounds can be identified where
previously only broad categories such as orthophosphate monoesters and diesters were
distinguishable. The Soil Archive and Long Term Experiments at Rothamsted Research, UK,
potentially provides an unequalled opportunity to use this technique to observe changes in
soil phosphorus compounds with time and under different treatments, thereby enhancing our
understanding of phosphorus cycling and use by plants. Some of the earliest work using this
technique on soils was carried out by Hawkes et al. in 1984 and this used soils from two of
the oldest Rothamsted Long Term Experiments, namely Highfield and Park Grass.
Here we revisit the samples studied in this early work and reanalyse them using
current methodology to demonstrate how the 31P-NMR technique has advanced.
We also present results from a study on the phosphorus chemistry in soils along
the Hoosfield acid strip (Rothamsted, UK), where a pH gradient from 3.7 to 7.8
occurs in a single soil with little variation in total phosphorus (mean ± standard
deviation 399 ± 27 mg P kg-1). Soil pH was found to be an important factor in
determining the proportion of phosphomonoesters and phosphodiesters in the soil organic
phosphorus, although total organic phosphorus concentrations were a relatively
consistent proportion of the total soil phosphorus (36 ± 2%) irrespective of soil
pH.
Key words.
31P-NMR, soil organic phosphorus, long term experiments, Hoosfield acid strip |
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