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The impact of soil properties on C stocks and mineralization rates of three deciduous forest sites

The impact of soil properties on C stocks and mineralization rates of three deciduous forest sites. Marion Schrumpf 1 , Klaus Kaiser 2 , Tryggve Persson 3 , Matthias Grabe 2 , Ingrid Kögel-Knabner 4 , Mats Olsson 5 1 Max-Planck-Institute for Biogeochemistry, Jena, Germany

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The impact of soil properties on C stocks and mineralization rates of three deciduous forest sites

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  1. The impact of soil properties on C stocks and mineralization rates of three deciduous forest sites Marion Schrumpf1, Klaus Kaiser2, Tryggve Persson3, Matthias Grabe2, Ingrid Kögel-Knabner4, Mats Olsson5 1Max-Planck-Institute for Biogeochemistry, Jena, Germany 2Department of Soil Science and Soil Biology, University of Halle, Germany 3Department of Ecology and Environmental Research, Swedish University of Agricultural Sciences,Uppsala, Sweden 4Department of Soil Science, TU Munich, Weihenstephan, Germany 5Department of Forest Soils, Swedish University of Agricultural Sciences, Uppsala, Sweden

  2. Outline • Background and project aims • Study sites, sampling scheme and soil analyses • Correlations between soil properties and mineralization rates • Summary and conclusion

  3. Background Decomposition rates of SOM depend on:- environmental factors (temperature, soil moisture)- chemical composition of OM - degree of physical protection e.g. in aggregates - formation of organo-mineral complexes • mainly with clay-size particles • Al and Fe oxides and hydroxides

  4. Aims and research questions How does the association of organic matter with minerals affect mineralization rates and thus soil carbon storage? We expect to find lower mineralization rates at sites- with a large contribution of MOM to total C - with larger clay and pedogenic oxide contents

  5. Study sites Soroe Hainich Hesse

  6. Study sites Hainich (D) Beech forest (National Park) Location: 51°04´N, 10°27´E Stand age: ~250 years Tree height: 23 m Stem density: 334 stems ha-1 Eutric Cambisol Precipitation: 800 mm a-1 Mean temperature: 8 °C

  7. Study sites Hesse (F) Beech/oak forest Location: 48°40´N, 7°05´E Stand age: 40 years Tree height: 13 m Stem density: 3 000 stems ha-1 Stagnic Luvisol Precipitation: 820 mm a-1 Mean temperature: 9.2 °C

  8. Study sites Soroe (DK) Beech forest Location: 55°29´N, 11°38´E Stand age: 80 years Tree height: 25 m Stem density: 430 stems ha-1 Gleyic Cambisol Precipitation:660 mm a-1 Mean temperature: 8.2 °C

  9. 10 9 8 7 6 A1 5 B2 4 3 C3 D4 2 E5 1 F6 G7 -1 H8 -2 I9 -3 J10 K11 L12 M13 N14 O15 P16 Q17 R18 S19 T20 U21 V22 W23 X24 Y25 Soil sampling and analyses Soil sampling: - 10 cores per site - 0-5, 5-10, 10-20, 20-30 … cm • Soil analyses • C concentrations and stocks • mineralization rates (lab, 15°C, 60%WHC) • density fractionation (1.6 g cm-3, FPOM, OPOM, MOM) • particle size distribution • Fe and Al oxides and hydroxides (oxalate- and dithionite-extractable)

  10. C concentration [g kg-1] 0 2 4 6 8 10 Results – C concentrations

  11. Results – Mineralization rates topsoils r = -0.67p < 0.01

  12. Results – Mineralization rates topsoils r = -0.59p < 0.01

  13. Results – MOM topsoil r = 0.64p < 0.01

  14. Results – MOM topsoil r = 0.83p < 0.01 r = 0.55p < 0.05

  15. Results – Mineralization rates subsoils r = -0.40p < 0.05

  16. Results – Mineralization rates subsoils r = -0.53p < 0.01

  17. Results – Mineralization rates subsoils r = -0.70p < 0.01

  18. Results – MOM subsoil r = 0.74p < 0.01

  19. Results – MOM subsoil r = 0.90p < 0.01

  20. Results – Corg and soil properties *p < 0.05, **p < 0.01

  21. Summary and Conclusions • Large contributions of MOM to total C → lower mineralization rates especially in the topsoil • Large clay contents in the soil → lower mineralization rates • Total amount of MOM is related to the clay content and the amount of pedogenic Fe and Al oxides

  22. Summary and Conclusions • Overall lowest mineralization rates in the old growth forest Hainich with the highest content of - clay - MOM - pedogenic oxides This site also contains the oldest carbon • → Role of clay + its composition in the protection of OM needs further attention so that it can be included in soil models

  23. Thank you! We would like to thank the EU for financing CarboEurope IP Contract No. GOCE-CT2003-505572 • Many thanks to: • Marco Pöhlmann, Dunja Grüsser, Alexander Sinz, Antje Brückner and Thomas Heinze for their help with field work • - Ulrike Maul for doing the particle-size analyses • The chemical analytical department (especially Ines Hilke)

  24. Results – Δ14C of MOM

  25. Results – Mineralization rate r = 0.758p < 0.01

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