Continuous measurements of CO2 emission from cultivated peat soil

effect of tillage intensity

Örjan Berglund & Kerstin BerglundDepartment of Soil and Environment, SLUSweden

Long term field trial (R2-4014)

Gotland, Sweden

D-

nLoggertorn + solcellerAutomatiskaCO2 mätare, ca 1 m2/sida

A Ploughing every yearB Ploughing 1 out of 4 years / Shallow tillageC Shallow tillage with cultivatorD Permanent ley

Treatments

MeasurementsAn automatic CO2 emission measuring system with infrared (IRGA) gas analysers is used (ADC Automated Soil CO2 Exchange System)

The system also includes sensors for measuring PAR (Photosynthetically active radiation) Soil temperature Soil moisture

YieldSoil physical and chemical properties

Studying the effect of cultivation intensity on CO2 emissions

Soil properties and Yield Treat. Tot-C % Tot-N % pH LOI (%) Yield (Ton/ha)A 27.00 1.72 7.79 47.84 6.34B 28.61 1.83 7.81 47.91 6.44C 28.05 1.80 7.79 47.48 5.98D 36.48 2.49 7.47 66.02 7.85

A ploughing every yearB ploughing 1 out of 4 years C only stubble cultivationD permanent ley

Pilot study 2011

7/19 /11 7/20/11 7/21 /11 7/22/11 7/23/11

0

10

20

30

40C

O2

emis

sion

(mm

ol/m2

/s)

0.2

0.3

0.4

Wat

er c

onte

nt (v

ol/v

ol)

8

12

16

20

24

28

Tem

p (C)

Result 2012

Treatment Mean

A 2.14

B 2.59

C 2.90

D 4.53

2013

Treatment Mean

A 3.74

B 3.24

C 4.24

D 3.95

Treatment A (Ploughing 25 cm)

14-May 18-May 22-May11 12 13 15 16 17 19 20 21

0

10

20

30

CO

2 em

issi

on (µ

mol

m-2

s-1

)

Treatment B (cultivation 12 cm)

14-May 18-May 22-May11 12 13 15 16 17 19 20 21

0

10

20

30

CO

2 em

issi

on (µ

mol

m-2

s-1

)

Treatment C (cultivation 12 cm)

14-May 18-May 22-May11 12 13 15 16 17 19 20 21

0

10

20

30

CO

2 em

issi

on (µ

mol

m-2

s-1

)

Treatment D (permanent ley)

14-May 18-May 22-May11 12 13 15 16 17 19 20 21

0

10

20

30

CO

2 em

issi

on (µ

mol

m-2

s-1

)

Conclusions

CO2 emission (µmol m-2 s-1)

Treatment 2012 2013

A 2.14 3.74

B 2.59 3.24

C 2.90 4.24

D 4.53 3.95

• Larger emissions could be observed just after cultivation and that effect lasted for about one day.

• The average emission was highest from treatment D during 2012 and treatment C and D during 2013

Thank you for your attention!