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| Titel |
The distribution of soil phosphorus for global biogeochemical modeling |
| VerfasserIn |
X. Yang, W. M. Post, P. E. Thornton, A. Jain |
| 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 ; 10, no. 4 ; Nr. 10, no. 4 (2013-04-16), S.2525-2537 |
| Datensatznummer |
250018201
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| Publikation (Nr.) |
 copernicus.org/bg-10-2525-2013.pdf |
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| Zusammenfassung |
| Phosphorus (P) is a major element required for biological activity in
terrestrial ecosystems. Although the total P content in most soils can be
large, only a small fraction is available or in an organic form for
biological utilization because it is bound either in incompletely weathered
mineral particles, adsorbed on mineral surfaces, or, over the time of soil
formation, made unavailable by secondary mineral formation (occluded). In
order to adequately represent phosphorus availability in global
biogeochemistry–climate models, a representation of the amount and form of P
in soils globally is required. We develop an approach that builds on
existing knowledge of soil P processes and databases of parent material and
soil P measurements to provide spatially explicit estimates of different
forms of naturally occurring soil P on the global scale. We assembled data
on the various forms of phosphorus in soils globally, chronosequence
information, and several global spatial databases to develop a map of total
soil P and the distribution among mineral bound, labile, organic, occluded,
and secondary P forms in soils globally. The amount of P, to 50cm soil
depth, in soil labile, organic, occluded, and secondary pools is 3.6 ± 3, 8.6 ± 6, 12.2 ± 8,
and 3.2 ± 2 Pg P (Petagrams of P, 1 Pg = 1 × 1015g) respectively. The amount in soil mineral particles to the
same depth is estimated at 13.0 ± 8 Pg P for a global soil total of
40.6 ± 18 Pg P. The large uncertainty in our estimates reflects our
limited understanding of the processes controlling soil P transformations
during pedogenesis and a deficiency in the number of soil P measurements.
In spite of the large uncertainty, the estimated global spatial variation
and distribution of different soil P forms presented in this study will be
useful for global biogeochemistry models that include P as a limiting
element in biological production by providing initial estimates of the
available soil P for plant uptake and microbial utilization. |
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