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R.A. Viscarra Rosselwith contributions from C. Chen, P. Campbell, C. Lobsey, C. Sharman, J. Baldock
GSP-FAO, Rome. 21–23 March 2017
Agriculture
FullCAM
Forest
Land cover change
Climate
Agricultural management
Crop yields
Forest management
Forest growth
Estimates of change in C stock and GHG emissions
Soil
The Australia’s GHG inventory: pre-2014
Richards (2001)Richards and Evans (2004)
Inventory2000–2013
CS /tha-1CS t/ha
Baseline map of soil organic C stock 0–30 cm
Viscarra Rossel et al. 2014 GCB
Spatial modelling and mapping
• SCaRP: 2009–2012• vis–NIR predictions
(Viscarra Rossel & Webster, 2012)
• Cs = (C x ρ ) x (1–g)• Harmonised 0–30 cm
What did this map say about soil C in Australia?• The average stock in the 0–30
cm is 29.7 t/ha (22.6–37.9 t/ha)(cf. global average of 40–72 t/ha)
• Cropping soil has on average 35 t/ha (30–42 t/ha). The total stock is 0.90 Gt (0.75–1.1 Gt).
• Agricultural land (inc. grazing land) holds ~ 51% of the total C stock, i.e. 12.8 Gt (9.9–16.0 Gt)
• Even small increases in the soil organic C stock across the vast area of agricultural land could sequester a significant amount of organic C and thereby play an important role in the 4 per mille initiative.
Maps soil organic C composition 0–30 cm
• Physical fractionation & NMR ~500 samples (red points) (Baldock et al., 2014)
• vis–NIR prediction (grey points) (Viscarra Rossel & Hicks, 2015)
Inventory2000–2013
SCF /t ha-1
Viscarra Rossel et al. 2017 in prep.
Particulate 2–0.05 mm
Humus <0.05 mm
Resistant <2 mm
Decom
posableN
utrient poorR
esistantN
utrient rich
Australia-wide 90 x 90 m 3D soil attribute maps in 6 layers
Viscarra Rossel, et al. (2015)
Data downloadable via:
• CSIRO data access portal• Google Earth Engine Project, data and methods described in Special Issue of Soil Research Vol. 53
Inventory1950–2014• Site data• vis–NIR
predictionsViscarra Rossel & Webster (2012)
Agriculture
FullCAM
Forest
Land cover change
Climate
Agricultural management
Crop yields
Forest management
Forest growth
Estimates of change in C stock and GHG emissions
Soil
Informing Australia’s GHG inventory: post-2014
Total net emissions2016
523.1 Mt CO2-eAgriculture
72.4 Mt CO2-e
Crediting of GHG abatement in the land sectorThe Carbon Credits Act 2011 enables crediting of GHG abatement in the land sector.
Emissions Reduction Fund (ERF) – a voluntary offsets scheme provides opportunity for farmers to earn income by reducing GHG emissions and/or storing C in soil and vegetation though changes to agricultural land management.
Legislated methods to quantify changes in soil Cunder the Australian Emissions Reduction Fund
Based on measurementsSequestering carbon
in soil in grazing systems
ΔC t/ha yr-1 = (Ctn – Ct0)/(tn – t0)
Based on modellingSequestering carbon in soil using
modelled abatement estimates
ΔC t/ha yr-1 = ΔCGain – ΔCLoss
• Uses geo-stratification of CEA and random sampling with compositing across strata (Chappell et al., 2014) and laboratory analysis of composite samples
• Cost for sampling and lab measurements but provides more confidence
• Simulates changes using default values for different management actions derived from FullCAM.
• No sampling or laboratory analysis, small cost but also less confidence in the magnitude of change – conservative estimates
TWG updating the measurement based method to enable: • Use of prior information for stratification in the sampling design
• Use of sensors (visible–infrared; gamma-ray attenuation) to measure organic C stocks (England & Viscarra Rossel, 2016; Viscarra Rossel, 2017)
Method being developed to enable future updates as technologies develop
Based on measurements
Sequestering carbon in soil in grazing systems
ΔC t/ha yr-1 = (Ctn – Ct0)/(tn – t0)
Based on modelling
Sequestering carbon in soil using modelled abatement estimates
ΔC t/ha yr-1 = ΔCGain – ΔCLoss
Legislated methods to monitor changes in soil Cunder the Australian Emissions Reduction Fund
Sensing of soil organic C stocks
• Visible and thermal cameras• vis–NIR spectrometer• Gamma attenuation sensor
(Lobsey & Viscarra Rossel, 2016 - EJSS)
• Embedded computing• 3G communication
• Can measure 1.5 m soil core • Measurements at z cm
intervals. 1 m soil core with z = 2.5 cm measured in around 15–20 min, i.e. ~ 35 s per measurement
Automated field deployable soil core sensing platform
Viscarra Rossel et al. (2017) submitted
Rapid, accurate measures of soil C stockSensor measurements on 150 soil cores from three CEAs in a 300 ha farm in NSW
R2 = 0.84 R2 = 0.76 R2 = 0.74 R2 = 0.75 R2 = 0.80 R2 = 0.76
Spectroscopic modelling using RS-LOCAL method (Lobsey & Viscarra Rossel, 2017)
Estimating the stocks of C and 3D mapping
Depthcm
Meant/ha
S.E.t/ha
0–10 8.05 0.23
10–20 7.12 0.31
20–30 4.85 0.25
30–40 4.03 0.19
40–50 3.64 0.16
50–60 3.63 0.17
60–70 3.55 0.14
70–80 3.32 0.11
Design-based estimates of the mean organic C stock for discrete depth layers
Mean 20.0 S.E. 0.6
Mean 18.6 S.E. 0.7
Estimating the stocks of C and 3D mapping
Design-based estimates of the mean organic C stock for discrete depth layers
Depthcm
Meant/ha
S.E.t/ha
0–10 8.05 0.23
10–20 7.12 0.31
20–30 4.85 0.25
30–40 4.03 0.19
40–50 3.64 0.16
50–60 3.63 0.17
60–70 3.55 0.14
70–80 3.32 0.11
Design-based estimates of the mean organic C stock for discrete depth layers
Mean 20.0 S.E. 0.6
Mean 18.6 S.E. 0.7
Final remarksWe have many of the ‘pieces’ needed for a statistically sound soil organic C monitoring system: putting it together is our current aim.
Data-modelassimilation
Best prediction of soil C + s at time t
Best parameter estimates + s at time t
Carbon Model
Temporal downscaled
updates
Soil properties + s
Land use & management…
Climate + s
Spatialmodelling &
estimation + sProximal
sensing + s
Remotesensing + s
ts
Analytical data + s
Spatially explicit data Model Assimilation Prediction
Final remarksWe have many of the ‘pieces’ needed for a statistically sound soil organic C monitoring system: putting it together is our current aim.
Data-modelassimilation
Best prediction of soil C + s at time t
Best parameter estimates + s at time t
Carbon Model
Temporal downscaled
updates
Soil properties + s
Land use & management…
Climate + s
Spatialmodelling &
estimation + sProximal
sensing + s
Remotesensing + s
ts
Analytical data + s
Spatially explicit data Model Assimilation Prediction
Final remarksWe have many of the ‘pieces’ needed for a statistically sound soil organic C monitoring system: putting it together is our current aim.
Data-modelassimilation
Best prediction of soil C + s at time t
Best parameter estimates + s at time t
Carbon Model
Temporal downscaled
updates
Soil properties + s
Land use & management…
Climate + s
Spatialmodelling &
estimation + sProximal
sensing + s
Remotesensing + s
ts
Analytical data + s
Spatially explicit data Model Assimilation Prediction
Final remarksWe have many of the ‘pieces’ needed for a statistically sound soil organic C monitoring system: putting it together is our current aim.
Data-modelassimilation
Best prediction of soil C + s at time t
Best parameter estimates + s at time t
Carbon Model
Temporal downscaled
updates
Soil properties + s
Land use & management…
Climate + s
Spatialmodelling &
estimation + sProximal
sensing + s
Remotesensing + s
ts
Analytical data + s
Spatially explicit data Model Assimilation Prediction
Thank you.
For more information on any of the content please come see me or contact me:
Raphael VISCARRA [email protected]+61 467 769 364