Soil micro-food web structure and functions exhibit contrasting dynamics according to litter quality

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Soil micro-food web structure and functions exhibit

contrasting dynamics according to litter quality

Marie Sauvadet, Matthieu Chauvat, Daniel Cluzeau, Pierre-Alain Maron,

Cecile Villenave, Isabelle Bertrand

To cite this version:

Marie Sauvadet, Matthieu Chauvat, Daniel Cluzeau, Pierre-Alain Maron, Cecile Villenave, et al.. Soil micro-food web structure and functions exhibit contrasting dynamics according to litter quality. 5. International EcoSummit: Ecological Sustainability: Engineering Change, Aug 2016, Montpellier, France. �hal-02740667�

EcoSummit 2016

Montpellier, Aug-Sep 2016

1

M. Sauvadet

1

_{, M. Chauvat}

2

_{, D. Cluzeau}

3

_{, P-A. Maron}

5

_{, C. Villenave}

6

_{, I. Bertrand}

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Soil micro-food web structure and functions

exhibit contrasting dynamics

according to litter quality

1

_{INRA UMR FARE Reims;}

2

_{ECODIV, University of Rouen,;}

3

_{ECOBIO, University of Rennes;}

4

_{INRA Agroecologie Dijon;}

6

_{ELISOL Environnement; INRA UMR ECO&SOLS, Montpellier.}

Soil sampling

in the Estrees-Mons

SOERE

Incubation at 15°C

in microcosms

Incorporation of litter

in the 0-5 cm layer

Maize leaves

No addition

Maize roots

Variables followed: at 0, 15, 35 and 91 days after incubation

Soil micro-food web structure (genus level)

Decomposition functions

Which effects of litter quality on soil microfood-web structure and functions?

Study approach

3

Density: 0.27 Density: 0.13 1 2 3 4 5 6 10 11 12 13 7 8 9 Density: 0.15 2 3 4 5 6 10 11 12 13 7 8 9 Density: 0.17 1 2 3 4 5 6 10 11 12 13 7 8 9

Leaves

Roots

35 days

91 days

Acidobacteria Actinobacteria cp1 bacterial feeders cp2 bacterial feeders cp2 fungal feeders Ascomycota Bacteroidetes Basidiomycota Chytridiomycota Planctomycetes Proteobacteria Thaumarchaeota cp2 predators 1 2 3 4 5 6

Nematodes

Fungi

Bacteria

1 4

Litter quality effects on micro-food web interactions

1 2 3 4 5 6 10 11 12 13 7 8 9 7 8 9 10 11 12 13 Positive correlation Negative correlation

Main conclusions

- Significant effects of litter quality on micro-food web structure and functions, but

dependent of the stage of decomposition

- Contrasting micro

food-web structure – functions

relationships according the

litter degraded

- Biotic interactions varied with litter quality and stage of decomposition, and were

higher during the early stage of leaf decomposition

Phenol oxidase: Oxidative enzymes

Oxidative enzymes Hydrolytic enzymes

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35 days with leaves 91 days with leaves

35 days with roots 91 days with roots

-1 .0 -0 .5 0 .0 0 .5 1 .0 RDA2 : 1 8 .7 % 2 3 4 5 6 7 8 9 10 11 12 13

5

Acknowledgments

More informations:

- Sauvadet et al. (2016) Soil

Biology&Biochemistry 95: 262-274

Projet SOFIA

Projet SOFIA (Soil Functional diversity as an indicator of

sustainable management of Agroecosystems)