Abstract
In montane cloud forests (MCF), the main soil organic carbon (SOC) pool is believed to be constituted by organic debris accumulated on soil surface and, to a lesser extent, by the organic fraction associated with the mineral matrix. The vertical distribution of SOC within soil has strong implications on the composition, stabilization and turnover of the soil organic matter (SOM). In ecosystems like MCF, where the climatic and edaphic conditions varied with altitude, the SOM accumulation and stabilization mechanisms possibly respond to these changes. For that reason, we studied the vertical distribution, accumulation and chemical composition of SOM in five montane cloud forest communities located between 1,500 and 2,500 m a.s.l. Two main SOC accumulation patterns were found: one at 1,500, 1,950 and 2,400 m a.s.l., with SOC content gradually decreasing with depth (cumulative); and another at 2,050 and 2,500 m a.s.l. where SOC had a strong maximum in the surface horizon and a less pronounced increase the spodic horizon (eluviation–illuviation pattern). The total SOC pool in soil decreased in inverse relation to altitude from 227 C ha−1 at 1,500 m a.s.l. down to 143 mg C ha−1 at 2,500 m a.s.l. About 40–60 % of total SOC content corresponded to the surficial organic horizon. The chemical fractionation of the SOM denoted in general predominance of the fulvic acid fraction, and high content of humin and humic acid fractions. We considered that the main SOC vertical distribution processes were related to the raw humus accumulation, decomposition in situ, podzolization in the eluviation–illuviation pattern soils mainly.
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Acknowledgments
This research was supported by the Projects SEP-CONACyT 55718, SEMARNAT-CONACyT 23489; PAPIIT IN104807 and IN216906-3. The authors would like to thank M. del S. Galicia Palacios, E. Fuentes Romero, R. Ramos Bello (Lab. Edafología, Facultad de Ciencias, UNAM) for chemical analyses.
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Communicated by A. Merino.
This article originates from the international symposium “Managed Forests in Future Landscapes. Implications for Water and Carbon Cycles (COST action FP 0601 FORMAN)”.
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Álvarez-Arteaga, G., Krasilnikov, P. & García-Calderón, N.E. Vertical distribution and soil organic matter composition in a montane cloud forest, Oaxaca, Mexico. Eur J Forest Res 131, 1643–1651 (2012). https://doi.org/10.1007/s10342-012-0643-4
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DOI: https://doi.org/10.1007/s10342-012-0643-4