Land-use effects on phosphorus fractions in cerrado oxisols
Differently managed oxisols from Central Brazil were studied using a sequential P fractionation procedure because the effects of land use on the distribution of P forms in these soils are barely known. Therefore levels of labile and recalcitrant P forms in the natural Cerrado savanna were compared w...
| Autores principales: | , , , |
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| Formato: | Journal Article |
| Lenguaje: | Inglés |
| Publicado: |
Springer
2000
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/43630 |
| _version_ | 1855532306655084544 |
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| author | Neufeldt, Henry Silva, J.E. da Ayarza, Miguel Angel Zech, W. |
| author_browse | Ayarza, Miguel Angel Neufeldt, Henry Silva, J.E. da Zech, W. |
| author_facet | Neufeldt, Henry Silva, J.E. da Ayarza, Miguel Angel Zech, W. |
| author_sort | Neufeldt, Henry |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Differently managed oxisols from Central Brazil were studied using a sequential P fractionation procedure because the effects of land use on the distribution of P forms in these soils are barely known. Therefore levels of labile and recalcitrant P forms in the natural Cerrado savanna were compared with those of crop, pasture and reforestation sites on differently textured oxisols. Under natural conditions of strong P deficiency, >60% of labile P was organic P (Po), reflecting the high contribution of Po to plant nutrition. Fertilisation after land-use change only increased levels of inorganic P (Pi) forms, the increase being most accentuated in the labile Pi fraction. At the crop and the pasture sites P tended to accumulate as recalcitrant P forms in the clayey soils, while in the loamy soils there was only a minor enrichment, probably due to the lower amounts of Fe- and Al-(hydr)oxides. In the reforestation sites, labile P was maintained at high levels, most likely through efficient recycling of the litter. The P fractionation procedure was also applied to particle-size fractions which reflected P transformations along an organic and mineralogical gradient. The clay fraction corresponded to 69–87% of total P and appeared to be both a sink for highly recalcitrant P and a source for labile P, especially labile Po. The sequential P fractionation procedure was also an effective method with which to detect the presence of fertiliser-P residues in the coarse-silt fraction. |
| format | Journal Article |
| id | CGSpace43630 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 2000 |
| publishDateRange | 2000 |
| publishDateSort | 2000 |
| publisher | Springer |
| publisherStr | Springer |
| record_format | dspace |
| spelling | CGSpace436302024-08-27T10:36:35Z Land-use effects on phosphorus fractions in cerrado oxisols Neufeldt, Henry Silva, J.E. da Ayarza, Miguel Angel Zech, W. land use oxisols phosphorus utilización de la tierra oxisoles fósforo Differently managed oxisols from Central Brazil were studied using a sequential P fractionation procedure because the effects of land use on the distribution of P forms in these soils are barely known. Therefore levels of labile and recalcitrant P forms in the natural Cerrado savanna were compared with those of crop, pasture and reforestation sites on differently textured oxisols. Under natural conditions of strong P deficiency, >60% of labile P was organic P (Po), reflecting the high contribution of Po to plant nutrition. Fertilisation after land-use change only increased levels of inorganic P (Pi) forms, the increase being most accentuated in the labile Pi fraction. At the crop and the pasture sites P tended to accumulate as recalcitrant P forms in the clayey soils, while in the loamy soils there was only a minor enrichment, probably due to the lower amounts of Fe- and Al-(hydr)oxides. In the reforestation sites, labile P was maintained at high levels, most likely through efficient recycling of the litter. The P fractionation procedure was also applied to particle-size fractions which reflected P transformations along an organic and mineralogical gradient. The clay fraction corresponded to 69–87% of total P and appeared to be both a sink for highly recalcitrant P and a source for labile P, especially labile Po. The sequential P fractionation procedure was also an effective method with which to detect the presence of fertiliser-P residues in the coarse-silt fraction. 2000-04-04 2014-09-24T08:42:25Z 2014-09-24T08:42:25Z Journal Article https://hdl.handle.net/10568/43630 en Limited Access Springer |
| spellingShingle | land use oxisols phosphorus utilización de la tierra oxisoles fósforo Neufeldt, Henry Silva, J.E. da Ayarza, Miguel Angel Zech, W. Land-use effects on phosphorus fractions in cerrado oxisols |
| title | Land-use effects on phosphorus fractions in cerrado oxisols |
| title_full | Land-use effects on phosphorus fractions in cerrado oxisols |
| title_fullStr | Land-use effects on phosphorus fractions in cerrado oxisols |
| title_full_unstemmed | Land-use effects on phosphorus fractions in cerrado oxisols |
| title_short | Land-use effects on phosphorus fractions in cerrado oxisols |
| title_sort | land use effects on phosphorus fractions in cerrado oxisols |
| topic | land use oxisols phosphorus utilización de la tierra oxisoles fósforo |
| url | https://hdl.handle.net/10568/43630 |
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