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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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slide1

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

slide2

Outline

  • Background and project aims
  • Study sites, sampling scheme and soil analyses
  • Correlations between soil properties and mineralization rates
  • Summary and conclusion
slide3

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
slide4

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

slide5

Study sites

Soroe

Hainich

Hesse

slide6

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

slide7

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

slide8

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

slide9

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)
slide10

C concentration [g kg-1]

0

2

4

6

8

10

Results – C concentrations

slide13

Results – MOM topsoil

r = 0.64p < 0.01

slide14

Results – MOM topsoil

r = 0.83p < 0.01

r = 0.55p < 0.05

slide18

Results – MOM subsoil

r = 0.74p < 0.01

slide19

Results – MOM subsoil

r = 0.90p < 0.01

slide21

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
slide22

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
slide23

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)