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Characterization of in situ organic matter constituents in vertisols from Argentina, using submicroscopic and cytochemical methods — first report |
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| Authors: | S Stephan J Berrier AA De Petre C Jeanson MJ Kooistra HW Scharpenseel H Schiffmann |
| Institution: | 1 Institut für Bodenkunde der Universität Nussallee 13, 5300, Bonn, F.R.G. 2 C.N.R.A., Département de Science du Sol, Etoile de Choisy, Route de Saint-Cyr, 78000, Versailles, France 3 Facultad de Ciencias Agropecuarias, Universidad Nacional de Entre Rios, Tezanos Pinto, E.R., Argentina 4 C.N.R.S., Muséum National d'Histoire Naturelle, 4 Avenue du Petit Chateau, 91800, Brunoy, France 5 Netherlands Soil Survey Institute, P.O. Box 98, 6700 AB, Wageningen, The Netherlands 6 Ordinariat für Bodenkunde der Universität, Von-Melle-Park 10, 2000, Hamburg, F.R.G. |
| Abstract: | The investigation of residence, alteration and circulation of soil organic matter is an ideal problem for integrated research including microscopy and submicroscopic methods. The subject of the present study is an argillic Pelludert of Argentina. The organic matter in this soil shows an unexpectedly steep gradient of 14C age. Below 25 cm the frequency of microscopic organic features decreases rapidly. Only few types are present at greater depth. Features produced by faunal activity, as well as brown to black areas of different composition have been investigated with SEM-EDXRA. The main subjects of laserinduced mass spectra were dark grains of few microns diameter which abound in the fine mass. Some spectra are presented and discussed. Further investigations are planned in order to demonstrate how submicroscopy, associated to the physico-chemical methods, can contribute to the knowledge and to the comprehension of the genesis of Vertisols. |
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