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.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    Mean residence time of soil organic matter associated with kaolinite and smectite
    Wattel-Koekkoek, E.J.W. ; Buurman, P. ; Plicht, J. van der; Wattel, J.T. ; Breemen, N. van - \ 2003
    European Journal of Soil Science 54 (2003). - ISSN 1351-0754 - p. 269 - 278.
    radiocarbon measurements - carbon - turnover - dynamics - complexes - pools - size - land - age
    To gain insight into the effect of clay mineralogy on the turnover of organic matter, we analysed the C-14 activity of soil organic matter associated with clay in soils dominated by kaolinite and smectite in natural savanna systems in seven countries. Assuming that carbon inputs and outputs are in equilibrium in such soils, we took the C-14 age as mean residence time of the organic matter. We corrected the C-14 activity for the Suess effect, Bomb effect and difference between date of sampling and date of C-14 measurement. Organic matter associated with kaolinite turned over fast (360 years on average). Organic matter associated with smectite turned over relatively slowly, with an average mean residence time for the whole clay-size fraction of 1100 years. Multiple linear regression indicates that clay mineralogy is the main factor explaining differences in the mean residence time of the organic matter extracted.
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