Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

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Record number 358921
Title Modelling the transformations and sequestration of soil organic matter in two constrasting ecosystems of the Andes
Author(s) Pansu, M.; Sarmiento, L.; Metselaar, K.; Hervé, D.; Bottner, P.
Source European Journal of Soil Science 58 (2007)3. - ISSN 1351-0754 - p. 775 - 785.
Department(s) Soil Physics, Ecohydrology and Groundwater Management
Publication type Refereed Article in a scientific journal
Publication year 2007
Keyword(s) differently textured soils - high tropical andes - microbial biomass - nitrogen dynamics - clay content - turnover - carbon - simulation - decomposition - temperature
Abstract The mechanisms linking soil respiration to climate and soil physical properties are important for modelling transformation and sequestration of C and N in the soil. We investigated them by incubating C-14 and N-15 labelled straw in soils of the dry puna (Bolivian altiplano, semi-arid shrubland at 3789 m above sea level) and the humid paramo (Venezuelan tropical alpine vegetation at 3400 m). These two ecosystems of the high Andes are comparable in terms of altitude, mean temperature and land use, but are very different regarding organic matter content, rainfall patterns and soil physical properties. Total C-14 and N-15, microbial-biomass C-14 and N-15, soil moisture and meteorological data were recorded over 2 years. Daily soil moisture was predicted from a water balance model. The data from the paramo site were used to calibrate MOMOS-6, a model of organic matter decomposition based on microbial activity and requiring only kinetic constant parameters to describe: (i) inputs to microbial biomass from plant debris and microbial metabolites, and (ii) losses from the biomass by mortality and respiration (respiration coefficient and microbial metabolic quotient qCO(2)). The simulated qCO(2)-C-14 agrees well with qCO(2)-C-14 and qCO(2) measured at the calibration site and with published data. To apply MOMOS-6 to the puna site, only the respiration coefficient of the biomass was re-estimated. The dynamics of C-14 and N-15 were very different in the two systems. In the puna, the transformation processes stop during the long dry periods, though total annual mineralization is greater than in the paramo. The change in the value of the respiration coefficient enables us to predict that the amount of C and N sequestered in the stable humus is greater in the paramo than in the puna. The data in this paper can be used to estimate values of the respiration coefficient so that MOMOS-6 can be applied to other systems.
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