Acid monophosphatase: an indicator of phosphorus mineralization or of microbial activity? A case study from the Brazilian cerrados
Plant production in the Brazilian savannas, also known as the Cerrados, is limited mainly by low P availability. In tropical soils, rich in sesquioxides, P supply of plants depends heavily on the transformation of organic P by phosphatase enzymes into HPO 4 2- and H 2 PO 4-. We examined two Oxisols-...
| Autores principales: | , , , , |
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| Formato: | Capítulo de libro |
| Lenguaje: | Inglés |
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International Center for Tropical Agriculture
1999
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| Materias: | |
| Acceso en línea: | https://hdl.handle.net/10568/55137 |
| _version_ | 1855530573935673344 |
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| author | Renz, TE Neufeldt, Henry Ayarza, Miguel Angel Silva, J.E. da Zech, W. |
| author_browse | Ayarza, Miguel Angel Neufeldt, Henry Renz, TE Silva, J.E. da Zech, W. |
| author_facet | Renz, TE Neufeldt, Henry Ayarza, Miguel Angel Silva, J.E. da Zech, W. |
| author_sort | Renz, TE |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | Plant production in the Brazilian savannas, also known as the Cerrados, is limited mainly by low P availability. In tropical soils, rich in sesquioxides, P supply of plants depends heavily on the transformation of organic P by phosphatase enzymes into HPO 4 2- and H 2 PO 4-. We examined two Oxisols-one clayey and one loamy-under different land uses for their potential acid monophosphatase activity (PAMA) and potential microbial activity. We measured dimethyl sulfoxide reduction, pH, total C and N, and NaOH-extractable organic and inorganic P. For all parameters other than pH, values were about twice as high in the clayey as in the loamy soil. Land use was found to strongly affect phosphatase activity, which was reduced by both cropping and reforestation. In the clayey soil, pastures seemed to have a positive effect on phosphatase activity. A change of continuous cropping to pasture resulted in a rapid recovery of phosphatase activity, microbial activity, and C and N levels. However, it retained the high inorganic P (Pi) levels found in fertilized crops. A comparison of phosphatase activity with microbial activity, total C and N, and P fractions showed that phosphatase was strongly related to microbial activity in the soil and therefore depended much more on soil organic matter than on soil P levels. We also found that, although PAMA is useful for indicating a soil`s P mineralization capacity, it does not indicate actual P mineralization rates. However, when combined with findings for microbial activity and Pi, it indicates the level of microbially available P, a lack of which probably implies strong competition between plants and microorganisms for this element. |
| format | Book Chapter |
| id | CGSpace55137 |
| institution | CGIAR Consortium |
| language | Inglés |
| publishDate | 1999 |
| publishDateRange | 1999 |
| publishDateSort | 1999 |
| publisher | International Center for Tropical Agriculture |
| publisherStr | International Center for Tropical Agriculture |
| record_format | dspace |
| spelling | CGSpace551372024-01-09T09:48:57Z Acid monophosphatase: an indicator of phosphorus mineralization or of microbial activity? A case study from the Brazilian cerrados Renz, TE Neufeldt, Henry Ayarza, Miguel Angel Silva, J.E. da Zech, W. savannas soil management soil biology oxisols phosphorus sabanas manejo del suelo biología del suelo oxisoles fósforo Plant production in the Brazilian savannas, also known as the Cerrados, is limited mainly by low P availability. In tropical soils, rich in sesquioxides, P supply of plants depends heavily on the transformation of organic P by phosphatase enzymes into HPO 4 2- and H 2 PO 4-. We examined two Oxisols-one clayey and one loamy-under different land uses for their potential acid monophosphatase activity (PAMA) and potential microbial activity. We measured dimethyl sulfoxide reduction, pH, total C and N, and NaOH-extractable organic and inorganic P. For all parameters other than pH, values were about twice as high in the clayey as in the loamy soil. Land use was found to strongly affect phosphatase activity, which was reduced by both cropping and reforestation. In the clayey soil, pastures seemed to have a positive effect on phosphatase activity. A change of continuous cropping to pasture resulted in a rapid recovery of phosphatase activity, microbial activity, and C and N levels. However, it retained the high inorganic P (Pi) levels found in fertilized crops. A comparison of phosphatase activity with microbial activity, total C and N, and P fractions showed that phosphatase was strongly related to microbial activity in the soil and therefore depended much more on soil organic matter than on soil P levels. We also found that, although PAMA is useful for indicating a soil`s P mineralization capacity, it does not indicate actual P mineralization rates. However, when combined with findings for microbial activity and Pi, it indicates the level of microbially available P, a lack of which probably implies strong competition between plants and microorganisms for this element. 1999 2015-01-28T14:17:28Z 2015-01-28T14:17:28Z Book Chapter https://hdl.handle.net/10568/55137 en Open Access International Center for Tropical Agriculture Renz, Timan E.; Neufeldt, Henry; Ayarza, Miguel Angel; Silva, José Eurípides da; Zech, Wolfgang. 1999. Acid monophosphatase: An indicator of phosphorus mineralization or of microbial activity?: A case study from the Brazilian cerrados. In: Thomas, Richard J.; Ayarza, Miguel Angel (eds.). Sustainable land management for the oxisols of the Latin American savannas: Dynamics of soil organic matter and indicators of soil quality. Centro Internacional de Agricultura Tropical (CIAT), Cali, CO. p. 173-186. (CIAT publication no. 312) |
| spellingShingle | savannas soil management soil biology oxisols phosphorus sabanas manejo del suelo biología del suelo oxisoles fósforo Renz, TE Neufeldt, Henry Ayarza, Miguel Angel Silva, J.E. da Zech, W. Acid monophosphatase: an indicator of phosphorus mineralization or of microbial activity? A case study from the Brazilian cerrados |
| title | Acid monophosphatase: an indicator of phosphorus mineralization or of microbial activity? A case study from the Brazilian cerrados |
| title_full | Acid monophosphatase: an indicator of phosphorus mineralization or of microbial activity? A case study from the Brazilian cerrados |
| title_fullStr | Acid monophosphatase: an indicator of phosphorus mineralization or of microbial activity? A case study from the Brazilian cerrados |
| title_full_unstemmed | Acid monophosphatase: an indicator of phosphorus mineralization or of microbial activity? A case study from the Brazilian cerrados |
| title_short | Acid monophosphatase: an indicator of phosphorus mineralization or of microbial activity? A case study from the Brazilian cerrados |
| title_sort | acid monophosphatase an indicator of phosphorus mineralization or of microbial activity a case study from the brazilian cerrados |
| topic | savannas soil management soil biology oxisols phosphorus sabanas manejo del suelo biología del suelo oxisoles fósforo |
| url | https://hdl.handle.net/10568/55137 |
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