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Mobilization of DOC from sandy loamy soils under different land use (Lower Saxony, Germany)

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Abstract

The conversion of natural forests into cultivated lands causes changes of the carbon cycle, which are of particular importance for fragile landscapes. We examined the mobilization of organic carbon in undisturbed soil monoliths of a deciduous forest, a pine plantation, and a pasture under constant temperature (20°C) and moisture via a leaching experiment. Soil percolation was performed with synthetic rainfall solution (pH 5) for a period of 20 weeks. The leachates of the first 12 weeks were analyzed for the pH, DOC content, light absorbance at 260 and 330 nm. At the end of the experiment soil pH, total carbon, C:N ratio, content of fractions of humic substances were examined. After 20 weeks of the leaching experiment the decrease of soil total Corg reached 29, 23, and 50% in soil monoliths of deciduous forest, pasture, and coniferous forest, respectively. The amounts of DOC removed constituted 6.4, 3.8, and 6.2% of initial soil Corg, respectively. Cumulative values of DOC production decreased in the sequence coniferous forest > deciduous forest > pasture. UV-Vis absorptivities of DOC were similar in both forests and differed from those in pasture. UV-Vis characteristics showed that DOC composition changed during the experiment. The intensive soil percolation caused alterations of the properties of soil organic matter, in particular a change of fraction composition of humic substances occurred.

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Authors
  1. T. E. Khomutova
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  2. L. T. Shirshova
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  3. S. Tinz
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  4. W. Rolland
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  5. J. Richter
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Khomutova, T.E., Shirshova, L.T., Tinz, S. et al. Mobilization of DOC from sandy loamy soils under different land use (Lower Saxony, Germany). Plant and Soil 219, 13–19 (2000). https://doi.org/10.1023/A:1004793515494

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  • DOI: https://doi.org/10.1023/A:1004793515494

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