EDAFOLOGÍA

Volumen 8-2. Agosto 2001. pág 67-79.

Composición y transformación de la materia orgánica en un histosol de la Serra do Xistral (norte de Galicia) mediante CPMAS 13C-NMR.

Pontevedra-Pombal, X.⁽¹⁾; Martínez-Cortizas, A.⁽¹⁾; García-Rodeja, E.⁽¹⁾; Buurman, P.(²⁾ y van Lagen, B.⁽²⁾

⁽¹⁾ Departamento de Edafoloxía e Química Agrícola. Facultade de Bioloxía. Universidade de Santiago de Compostela. Campus Sur s/n. 15706 Santiago de Compostela. Galicia. España. e-mail: edpombal@usc.es

⁽²⁾ Lab. Soil Science & Geology. Dept. Environmental Sciences. Wageningen Agricultural Univ. P.O. Box 37, 6700 AA Wageningen. The Netherlands.

Abstract. CPMAS ¹³C-NMR organic matter composition and transformation in an histosol of ‘Serra do Xistralí (North of Galicia, Spain): preliminary results. The composition of the organic carbon of a fibric histosol from the north of Galicia was studied using high resolution CPMAS ¹³C-NMR. With increasing depth (age), a continous decrease in the carbohydrate content and an increase in aliphatic-C was observed. After a slight increase in the upper centimetres of the peat, the aromatic and phenolic-C compounds reach a nearly constant value. A similar behaviour was observed for metoxilic and carboxylic-C. The observed evolution of functional nmr groups, particularly that of hydroxyl and aliphatic-C, shows that after 4000 years a stabilization of organic matter has not yet been reached. From the comparison with data obtained in other peat bogs from different latitudes, a general trend to a similar end point of evolution can be deduced.

Key words: Histosol, peat evolution, organic matter, functional nmr groups, Galicia.