31P-NMR-spectroscopic investigations of NaOH-extracts from soils with different land use in Yucatan (Mexico) |
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| Authors: | N Zech H G Alt A Zucker Ingrid Kgel |
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| Institution: | N. Zech,H. G. Alt,A. Zucker,Ingrid Kögel |
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| Abstract: | In aqueous NaOH-extracts of top-soils (0-10 cm) from typic chromuderts, phosphorus was determined by NMR-spectroscopy. In addition to inorganic orthophosphate, orthophosphate monoesters and diesters were detected. Pyrophosphate was only found in traces after clear-cutting and burning of the forests. The result of clear-cutting and agricultural land use is an increase of inorganic P from 19% (forest) to 33% (maize field). Compost gardens and mature tree gardens contain only 9-13% inorganic P in the NaOH-extract. The organic P-fraction consists mainly of orthophosphate monoesters (57-72%). The orthophosphate diester content is only 10–21%. It could be shown, that the increase of inorganic P in the course of clear-cutting and ploughing is correlated with a decrease of orthophosphate mono- and diesters. |
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