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| Titel |
Variations in chemical and physical properties of Amazon forest soils in relation to their genesis |
| VerfasserIn |
C. A. Quesada, J. Lloyd, M. Schwarz, S. Patiño, T. R. Baker, C. Czimczik, N. M. Fyllas, L. Martinelli, G. B. Nardoto, J. Schmerler, A. J. B. Santos, M. G. Hodnett, R. Herrera, F. J. Luizão, A. Arneth, G. Lloyd, N. Dezzeo, I. Hilke, I. Kuhlmann, M. Raessler, W. A. Brand, H. Geilmann, J. O. Moraes Filho, F. P. Carvalho, R. N. Araujo Filho, J. E. Chaves, O. F. Cruz Junior, T. P. Pimentel, R. Paiva |
| 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 ; 7, no. 5 ; Nr. 7, no. 5 (2010-05-17), S.1515-1541 |
| Datensatznummer |
250004769
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| Publikation (Nr.) |
 copernicus.org/bg-7-1515-2010.pdf |
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| Zusammenfassung |
| Soil samples were collected in six South American countries in a total of 71
different 1 ha forest plots across the Amazon Basin as part of the RAINFOR
project. They were analysed for total and exchangeable cations, C, N, pH
with various P fractions also determined. Physical properties were also
examined and an index of soil physical quality proposed. A diverse range of
soils was found. For the western areas near the Andean cordillera and the
southern and northern fringes, soils tend to be distributed among the lower
pedogenetic levels, while the central and eastern areas of Amazonia have
more intensely weathered soils. This gives rise to a large variation of soil
chemical and physical properties across the Basin, with soil properties
varying predictably along a gradient of pedogenic development. Nutrient
pools generally increased slightly in concentration from the youngest to the
intermediate aged soils after which a gradual decline was observed with the
lowest values found in the most weathered soils. Soil physical properties
were strongly correlated with soil fertility, with favourable physical
properties occurring in highly weathered and nutrient depleted soils and
with the least weathered, more fertile soils having higher incidence of
limiting physical properties. Soil phosphorus concentrations varied markedly
in accordance with weathering extent and appear to exert an important
influence on the nitrogen cycle of Amazon forest soils. |
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