GHG Fluxes Calculation. By Ahmad S. Mat Su Dec. 10, 2012
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1 GHG Fluxes Calculation By Ahmad S. Mat Su Dec. 10, 2012
2 Outline Method Matlab analysis Flux Analysis & Calculations Sherrington St Emmanuel Harrow Leamington St Louis de Blandford Compare at all site Conclusion
3 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 5 th and 6 th ) 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 Sorting -Time stamp (date) -Chamber ID - Gas type Unit conversion - ppm to mg/m 3 Filtering - Fixed threshold and stats Slope calculation - Median Flux calculation - CH4, N2O, CO2 Output
4 Outputs-Gas concentrations
5 Slopes
6 Predicted concentration: CH4
7 Predicted concentration: N 2 O
8 Predicted concentration: CO2
9 Fluxes
10 Treatments on all 5 sites Site Chamber ID Under Different Treatment Sherrington Irrigated Non-Irrigated Station Station Station Harrow Subirrigation, inorganic fertilizer Solid cattle manure fertilizer Subirrigation, solid cattle manure fertilizer Inorganic fertilizer Plot Plot Plot Plot St. Emmanuel Sub-200 kg/ha N Undrain Sub-120 kg/ha N 1, 7, 10 2, 6, 11 3 Leamington Sub-irrigation Surface Irrigation St. Louis De Blandford Irrigated Non-Irrigated Plot M8 1-5 Plot P Bog Sub-120 kg/ha (buffer) 4, 8, 9 Free-200 kg/ha 5, 12
11 Flux of CO 2, mg CO 2 -C/m 2.hr Sherrington Medium Soil: CO 2 1_Irrigated 1_non-irrigated Non-Irrigated Irrigated
12 Sherrington Mineralized Soil: CO _Irrigated 2_non-irrigated Flux of CO 2, mg CO 2 -C/m 2.hr Non-Irrigated Irrigated
13 Sherrington Organic Soil: CO _Irrigated 3_non-irrigated Flux of CO 2, mg CO 2 -C/m 2.hr Non-Irrigated Irrigated
14 Flux of N 2 O, mg N 2 O-N/m 2.hr Sherrington - Medium Soil: N 2 O 1_Irrigated 1_non-irrigated Non-Irrigated Irrigated
15 Flux of N 2 O, mg N 2 O-N/m 2.hr Sherrington Mineralized Soil: N 2 O _Irrigated 2_non-irrigated Non-Irrigated Irrigated
16 Flux of N 2 O, mgn 2 O-N/m 2.hr Sherrington Organic Soil: N 2 O 3_Irrigated 3_non-irrigated Non-Irrigated Irrigated
17 0.10 Sherrington Medium Soil: CH 4 Flux of CH 4, mg CH 4 -C/m 2.hr _Irrigated 1_non-irrigated Non-Irrigated Irrigated
18 Sherrington Mineralized Soil: CH _Irrigated 2_non-irrigated Flux of CH 4, mg Ch 4 -C/m 2.hr Non-Irrigated Irrigated
19 Sherrington Organic Soil: CH _Irrigated 3_non-irrigated Flux of CH 4, mg CH 4 -C/m 2.hr Non-Irrigated Irrigated
20 St. Emmanuel: CO 2 Flux of CO 2 -C, mg CO 2 -C/m 2.hr Sub-200kg/ha N Undrained strip Sub-120kg/ha N Sub-120kg/ha N Free drainage-120 kg/ha N
21 St. Emmanuel: N 2 O Flux of N 2 O, mg N 2 O-N/m 2.hr Sub-200kg/ha N Undrained strip Sub-120kg/ha N Sub-120kg/ha N Free drainage-120 kg/ha N
22 St. Emmanuel: CH Flux of CH 4, mg CH 4 -C/m 2.hr Sub-200kg/ha N Undrained strip Sub-120kg/ha N Sub-120kg/ha N Free drainage-120 kg/ha N
23 Harrow: CO 2 Flux of CO 2 -C, mg CO 2 -C/m 2.hr Inorganic fert. Sub-Inorganic fert. Solid manure Sub-Solid manure
24 Harrow: N 2 O Flux of N 2 O, mg N 2 O-N/m 2.hr Inorganic fert. Sub-Inorganic fert. Solid manure Sub-Solid manure Irrigation water ( 17mm, 13mm, 12mm)
25 Harrow: Irrigation Irrigation water, mm Plot 10: Max = 30 mm (Aug 6) Min = 1.2 mm Plot 13: Max = 36 mm (July 15) Min = 1.7 mm Plot 10 (sub-inorganic fert.) plot 13 (sub-solid manure) Date of irrigation
26 Harrow:CH 4 Flux of CH 4, mg CH 4 -C/m 2.hr Inorganic fert. Sub-Inorganic fert. Solid manure Sub-Solid manure
27 Leamington: CO 2 Flux of CO 2, mg CO 2 -C/m 2.hr Sub-surface surface
28 Leamington: N 2 O Flux of N 2 O, mg N 2 O-N/m 2.hr Sub-surface surface
29 Leamington: CH 4 Flux of CH 4, mg CH 4 -C/m 2.hr Sub-surface surface
30 St-Louis-de-Blandford: CO 2 Flux of CO 2, mg CO 2 -C/m 2.hr Irrigated Irrigated Non-irrigated
31 St-Louis-de-Blandford: N 2 O Flux of N 2 O, mg N 2 O-N/m 2.hr Irrigated Irrigated Non-irrigated
32 St-Louis-de-Blandford: CH 4 Flux of CH 4, mg CH 4 -C/m 2.hr Irrigated Irrigated Non-irrigated
33 Fluxes of all site: CO 2 Flux of CO 2, mg CO 2 -C/m 2.hr Harrow Sherrington St. Emmanuel St. Loius De Blandford Leamington
34 Fluxes of all site: N 2 O Flux of N 2 O, mg N 2 O-N/m 2.hr Harrow Sherrington St. Emmanuel St. Loius De Blandford Leamington
35 Fluxes of all site: CH Flux of CH 4, mg CH 4 -C/m 2.hr Harrow Sherrington St. Emmanuel St. Loius De Blandford Leamington
36 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.
37 Thank you
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