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GHG Fluxes Calculation By Ahmad S. Mat Su Dec. 10, 2012
GHG Fluxes Calculation
By Ahmad S. Mat Su
Dec. 10, 2012
Outline • Method
– Matlab analysis • Flux Analysis & Calculations
– Sherrington – St Emmanuel – Harrow – Leamington – St Louis de Blandford – Compare at all site
• Conclusion
Matlab Programming • Read an Excel file
– .xls or .xlsx
• Filtering – Remove the outliers
• Slope calculation – 10 slopes for 5 time intervals – Median value (average of the 5th and 6th)
• Flux calculation – Gas concentration per unit area per hour
• Output – Graphs – .txt file format, with headers – Descriptive statistics (min, max, median, mean, sd)
Input Read Excel file
Output
Sorting -Time stamp (date)
-Chamber ID - Gas type
Filtering - Fixed threshold and stats
Slope calculation - Median
Flux calculation - CH4, N2O, CO2
Unit conversion - ppm to mg/m3
Outputs-Gas concentrations
Slopes
Predicted concentration: CH4
Predicted concentration: N2O
Predicted concentration: CO2
Fluxes
Treatments on all 5 sites Site Chamber ID Under Different Treatment
Sherrington Irrigated Non-Irrigated Station 1 1-4 5-8 Station 2 9-12 13-16 Station 3 17-20 20-24
Harrow Inorganic fertilizer Subirrigation,
inorganic fertilizer Solid cattle
manure fertilizer
Subirrigation, solid cattle
manure fertilizer
Plot 9 1-6 Plot 10 7-12 Plot 12 13-18 Plot 13 19-24
St. Emmanuel Sub-200 kg/ha N Undrain Sub-120 kg/ha N Sub-120 kg/ha
(buffer) Free-200 kg/ha 1, 7, 10 2, 6, 11 3 4, 8, 9 5, 12
Leamington Sub-irrigation Surface Irrigation 1-5 6-10
St. Louis De Blandford Irrigated Non-Irrigated
Plot M8 1-5 Plot P7 6-10
Bog 11-15
-200
0
200
400
600
800
1000
1200
1400
1600
1800
1 2 3 4 5 6 7 8 9 10 11
Flux
of C
O2 ,
mg
CO2 -
C/m
2 .hr
Week
1_Irrigated 1_non-irrigated
Non-Irrigated Irrigated
Sherrington – Medium Soil: CO2
-1000
-500
0
500
1000
1500
1 2 3 4 5 6 7 8 9 10 11
Flux
of C
O2,
mg
CO2-
C/m
2 .hr
Week
2_Irrigated 2_non-irrigated
Non-Irrigated Irrigated
Sherrington – Mineralized Soil: CO2
-500
0
500
1000
1500
2000
2500
1 2 3 4 5 6 7 8 9 10 11
Flux
of C
O2,
mg
CO2-
C/m
2 .hr
Week
3_Irrigated 3_non-irrigated
Non-Irrigated Irrigated
Sherrington – Organic Soil: CO2
-0.10
-0.05
0.00
0.05
0.10
0.15
0.20
1 2 3 4 5 6 7 8 9 10 11
Flux
of N
2O, m
g N
2O-N
/m2 .h
r
Week
1_Irrigated1_non-irrigated
Non-Irrigated Irrigated
Sherrington - Medium Soil: N2O
-0.04
-0.02
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
1 2 3 4 5 6 7 8 9 10 11
Flux
of N
2O, m
g N
2O-N
/m2 .h
r
Week
2_Irrigated 2_non-irrigated
Non-Irrigated Irrigated
Sherrington – Mineralized Soil: N2O
-0.10
-0.05
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
1 2 3 4 5 6 7 8 9 10 11
Flux
of N
2O, m
gN2O
-N/m
2 .hr
Week
3_Irrigated 3_non-irrigated
Non-Irrigated Irrigated
Sherrington – Organic Soil: N2O
Sherrington – Medium Soil: CH4
-0.10
-0.08
-0.06
-0.04
-0.02
0.00
0.02
0.04
0.06
0.08
0.10
1 2 3 4 5 6 7 8 9 10 11
Flux
of C
H4,
mg
CH4-
C/m
2 .hr
Week
1_Irrigated 1_non-irrigated
Non-Irrigated Irrigated
Sherrington – Mineralized Soil: CH4
-0.10
-0.05
0.00
0.05
0.10
0.15
1 2 3 4 5 6 7 8 9 10 11
Flux
of C
H4 ,
mg
Ch4 -
C/m
2 .hr
Week
2_Irrigated 2_non-irrigated
Non-Irrigated Irrigated
Sherrington – Organic Soil: CH4
-0.10
-0.08
-0.06
-0.04
-0.02
0.00
0.02
0.04
0.06
1 2 3 4 5 6 7 8 9 10 11
Flux
of C
H4,
mg
CH4-
C/m
2 .hr
Week
3_Irrigated 3_non-irrigated
Non-Irrigated Irrigated
-500
0
500
1000
1500
2000
1 2 3 4 5 6 7Flux
of C
O2-
C, m
g CO
2-C/
m2 .h
r
Week
Sub-200kg/ha N
Undrained strip
Sub-120kg/ha N
Sub-120kg/ha N
Free drainage-120 kg/ha N
St. Emmanuel: CO2
-0.30
-0.20
-0.10
0.00
0.10
0.20
0.30
0.40
0.50
0.60
1 2 3 4 5 6 7
Flux
of N
2O, m
g N
2O-N
/m2 .h
r
Week
Sub-200kg/ha NUndrained stripSub-120kg/ha NSub-120kg/ha NFree drainage-120 kg/ha N
St. Emmanuel: N2O
St. Emmanuel: CH4
-0.15
-0.13
-0.11
-0.09
-0.07
-0.05
-0.03
-0.01
0.01
0.03
1 2 3 4 5 6 7
Flux
of C
H4,
mg
CH4-
C/m
2 .hr
Week
Sub-200kg/ha NUndrained stripSub-120kg/ha NSub-120kg/ha NFree drainage-120 kg/ha N
Harrow: CO2
0100200300400500600700800900
1000
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Flux
of C
O2-
C, m
g CO
2-C/
m2 .h
r
Week
Inorganic fert.Sub-Inorganic fert.Solid manureSub-Solid manure
Harrow: N2O
-0.20
0.00
0.20
0.40
0.60
0.80
1.00
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Flux
of N
2O, m
g N
2O-N
/m2 .h
r
Week
Inorganic fert.Sub-Inorganic fert.Solid manureSub-Solid manure
Irrigation water ( 17mm, 13mm, 12mm)
Harrow: Irrigation
0
5
10
15
20
25
30
35
40
Irrig
atio
n w
ater
, mm
Date of irrigation
Plot 10 (sub-inorganic fert.)plot 13 (sub-solid manure)
Plot 10: Max = 30 mm (Aug 6) Min = 1.2 mm Plot 13: Max = 36 mm (July 15) Min = 1.7 mm
Harrow:CH4
-0.30-0.25-0.20-0.15-0.10-0.050.000.050.10
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Flux
of C
H4,
mg
CH4-
C/m
2 .hr
Week
Inorganic fert.Sub-Inorganic fert.Solid manureSub-Solid manure
Leamington: CO2
-200
0
200
400
600
800
1000
1200
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20Flux
of C
O2,
mg
CO2-
C/m
2 .hr
Week
Sub-surface
surface
-0.3-0.10.10.30.50.70.91.11.31.5
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20Flux
of N
2O, m
g N
2O-N
/m2 .h
r
Week
Sub-surface
surface
Leamington: N2O
Leamington: CH4
-0.30
-0.25
-0.20
-0.15
-0.10
-0.05
0.00
0.05
0.10
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Flux
of C
H4,
mg
CH4-
C/m
2 .hr
Week
Sub-surface
surface
St-Louis-de-Blandford: CO2
-200
0
200
400
600
800
1000
1200
1 2 3 4 5 6 7 8 9 10 11 12 13Flux
of C
O2,
mg
CO2-
C/m
2 .hr
Week Irrigated Irrigated Non-irrigated
St-Louis-de-Blandford: N2O
-0.01
-0.01
0.00
0.01
0.01
1 2 3 4 5 6 7 8 9 10 11 12 13
Flux
of N
2O, m
g N
2O-N
/m2 .h
r
Week Irrigated Irrigated Non-irrigated
St-Louis-de-Blandford: CH4
-0.10
-0.08
-0.06
-0.04
-0.02
0.00
0.02
0.04
0.06
1 2 3 4 5 6 7 8 9 10 11 12 13
Flux
of C
H4,
mg
CH4-
C/m
2 .hr
Week Irrigated Irrigated Non-irrigated
Fluxes of all site: CO2
-500
0
500
1000
1500
2000
2500
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
Flux
of C
O2,
mg
CO
2-C
/m2 .h
r
Week
HarrowSherringtonSt. EmmanuelSt. Loius De BlandfordLeamington
Fluxes of all site: N2O
-0.2
0.0
0.2
0.4
0.6
0.8
1.0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
Flux
of N
2O, m
g N
2O-N
/m2 .h
r
Week
HarrowSherringtonSt. EmmanuelSt. Loius De BlandfordLeamington
Fluxes of all site: CH4
-0.20
-0.15
-0.10
-0.05
0.00
0.05
0.10
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
Flux
of C
H4,
mg
CH
4-C
/m2 .h
r
Week
HarrowSherringtonSt. EmmanuelSt. Loius De BlandfordLeamington
Conclusion • Total gas data collected in 2012: 6115 samples • So far, only lower threshold has been implemented
for data filtering. • Slope of concentration versus time has mostly linear
behavior, median slope calculation is more immune as compared to a single point outlier rather than a simple linear regression
• Methane gas measurements indicated the most sporadic behavior as compared to the other two. Carbon dioxide measurements indicated the most stable trends.
Thank you
