Soil microbial diversity and related soil functioning in urban parks

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Soil microbial diversity and related soil functioning in urban parks

S. Bourgerie, Mikael Motelica-Heino, I. Limam, Jean-Louis Yengue, D. Morabito

To cite this version:

S. Bourgerie, Mikael Motelica-Heino, I. Limam, Jean-Louis Yengue, D. Morabito. Soil microbial diversity and related soil functioning in urban parks. First Global Soil Biodiversity Conference -Assessing soil biodiversity and its role for ecosystem services, Dec 2014, Dijon, France. �hal-01090657�

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Soil microbial diversity and related soil functioning in urban parks

Mg2Al Mg2Cr

1 _{LBLGC, Université d’Orléans, France}

2 _{Institut des Sciences de la Terre d’Orléans (ISTO), UMR 7327 CNRS-Université d’Orléans, France}

3 _{CITERES, UMR 7324 CNRS-Université de Tours, France}

S. Bourgerie

1

, M. Motelica-Heino

2

, I. Limam

2

, E. Yengué

3

, D. Morabito

1

Conclusion

Material and methods

Introduction

Results

The main thrust of this work was to improve the knowledge concerning soil biodiversity and related ecosystem services in soils from urban parks in several cities of the Région Centre, France. In this work, the pedological, geochemical and microbiological characteristics of surface soils were investigated in order to make an inventory of soil fertility in several urban parks of the major cities of the Région Centre, France. The effects of agricultural practices on biomass, community structure and activity of micro-organisms were investigated in these soils in parallel with the determination of various pedo-physical and chemical parameters.

Results from this study showed that except for one site the microbial biomass for all samples was high. Metabolic quotients (qCO2) were in contrast variable for the different parks whether Shannon diversity indexes were quite similar for all the samples. The soil ecosystem has significantly influenced the functions of soil microbial community and hence probably its composition. More generally, catabolic diversity of soil microbial community is variable under the influence of various gardening practices and geological contexts. .

Région Centre (France)

The microbial biomass and community level physiological profiles were determined by using the MicroRespTM system in topsoils. Surface soil samples (0-20 cm) were also evaluated for physico-chemical characteristics such as the organic carbon and nitrogen concentrations, conductivity and pH together with their structure and texture and other soil physical parameters.

Physico-chemical characteristics of the surface soils

0 100 200 300 400 500 600 700

µ

g

C

/g

Bourges Blois

Orléans Tours Chartres

Chateauroux

Microbial biomass

0 0,01 0,02 0,03 0,04 0,05 0,06 0,07 0,08 0,09 0,1

qCO

₂

Bourges

Blois

Chateauroux

Equitability

Bourges Blois

Chateauroux Chartres Orléans Bourges Chateauroux Tours Blois Microbial parameters

Chateauroux Orléans Tours Chartres Bourges Blois

pH eau 7,1 7,3 7,8 7,6 7,6 7,3 Corga g/kg sol 25,5 69,6 56,6 13,6 30,2 21,7 N g/kg sol 5,1 4,81 3,36 3,6 6,9 5,9 C/N 5,0 14,5 16,8 3,8 4,4 3,7 Mg++ ex. (cmol/kg) 16,97 8,13 8,25 8,48 K+ éch. (cmol/kg) 12,18 5,17 2,76 6,08

Ca++ ex. (cmol/kg) 153,9 91,03 2213 153,8

Microbial study Physico-chemical study Sand 0 10 20 30 40 50 60 70 80 90 100 Silt 0 10 20 30 40 50 60 70 80 90 100 Clay 0 10 20 30 40 50 60 70 80 90 100 Chateauroux Orléans Tours Chartres Bourges Blois

Surface soils texture

0 5 10 15 20 25 30 35 40 45 50 P1 P2 A B C D P1 P2 P3 P1 P2 P3 P1 P2 P3

% of raw material of the surface soils

Bourges _Blois

Orléans Chartres

Chateauroux

Pedological study

pH: distilled water extracts (1:2.5 w/v) (NF ISO 10390)

Total organic carbon: Rock-Eval 6 (Vinci technologies)

Total nitrogen: Flash pyroliser

Exchangeable cations: LaMotte universal extraction solution (S/L 1/10) and ionic chromatography (Dionex ICS-2000, Sunnyvale, CA =) Sampling with a edleman auger

2 mm mesh sieving

LaMotte textural soil kit (code 1067)

Large green area (type 1): Lacustrian Limestone (Oligocene) Parc de l’Arrou, Blois

Neighborhood green area (type 2): Flint clay Parc Central, Chartres

Historical park (type 3): Sand and lacustrian limestone (Eocene) Parc Pasteur, Orléans

Semi-natural area and woodland (type 4): Jurassic Limestone and marls Prairie St-Gildas, Châteauroux

Jardin Lazenay, Bourges

Family gardens (type 5): Cretaceous sup. chalk and sands Jardins familiaux de la Bergeonnerie, Tours