greenhouse gas emissions and soil carbon stocks in the agricultural phase of sugarcane-derived...

Cerri (2009)

Greenhouse gas emissions and soil carbon stocks in the agricultural phase of

sugarcane-derived ethanol production in Brazil

Cerri (2009)

SOIL C

ETHANOL

FOSSIL EMISSIONS

FOSSIL EMISSIONS NON-FOSSIL EMISSIONS

NON-FOSSIL EMISSIONS

SURPLUS ELECTRICITY

VINASSE

FILTER CAKE

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Soil carbon stocks

100 cm

10 cm

100 cm

Stock = C content X bd X layer

% C d = m

V 10 cm

kg C m-2 or Mg C ha-1

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0-0.10m

1.5 m

Central trench

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0.40-0.50m

Central trench

1.5 m

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0.90-1.00 m

1.5 m

Central trench

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0-0.10m

0.10-0.20m

0.20-0.30m

Small trenches

Cerri (2009)

Soil carbon laboratory analyses

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Sample combustion (1400 oC) in closed furnace (pure O2) - C Quantification (%) → infrared

Soil carbon laboratory analyses

Cerri (2009)

Field sampling of GHG

T 2 T n T 3...... Hermetic seringes

T 1

Incubation chamber

Manual static chambers

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GHG emissions from N fertilizer

Field sampling of GHG

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Automated chambers

Field sampling of GHG

Cerri (2009) Vinasse – storage and trasportation

Field sampling of GHG

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Análises na própria usina

Cromatógrafo portátil

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Detectors: Electron Capture Detector → CO2 e N2O Flame Ionization Detector → CH4

T0 T5 T10 T20

GHG laboratory analyses

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Manual harvest – with burning

http://www.sugarcaneart.com/gallery/sugarcane.htm

Cerri (2009) Charcoal

Sugarcane quality

Gas emissions Biomass losses

Manual harvest – with burning

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Mechanized unburned sugarcane harvest

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Soil c

arbo

n (k

g.m

-2)

Native vegetation

Burned sugarcane

Change in management

CARBON REMAINING FROM FOREST

Cerri (2009)

Soil c

arbo

n Native vegetation Burned sugarcane

CARBON REMAINING FROM FOREST

Change in management

Cana-de-açúcar colhida sem queima

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burned not burned

In 8 years = 12.4 t C ha-1 (0-30 cm)

1.6 t C ha-1 year-1 (0-30 cm)

Experiment in Pradópolis, São Paulo, Brazil

Cerri (2009)

Soil c

arbo

n Degraded pastures Greencane

Soil carbon and LUC

Time

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 Limited capacity to store carbon  Carbon can be lost with disturbance  Dependent on soil and climate variables