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Methodological aspects of quantifying GHG 
emissions from rice fields 
Reiiner Wassmann 
Internatiionall Riice Research In...
‘Closed Chamber‘ Method 
Fan 
Fan 
time 
concentration 
Transparent chamber 
Septum 
Syringe 
or 
Vacutainer 
tube
Diurnal patterns: algorithms 
F = 13.2 F6 + 4.6 F12 + 7.2 F18 
16 
14 
12 
10 
8 
6 
4 
2 
0 
Mature rice plants 
0 6 12 1...
Seasonal patterns: Mid-season drainage 
water level (cm) / line Eh (mV) / dots 
100 
0 
-100 
-200 
water level (cm) / lin...
Field stations of the Intenational Rice Research Institute 
(projects funded by US-EPA and UNDP/ GEF) 
IrIrrrigigaatetedd ...
a 
b 
View of the 
field chambers 
(for flooded/ 
non-flooded 
condition)
Schematic Presentation of Automated System 
I) Field 
chambers 
II) Pneumatic 
unit 
III) Sample 
transfer 
IV) Calibratio...
Urea (Nueva Ecija) 
1200 
1000 
800 
600 
400 
200 
0 
JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 
start of rainy sea...
700 0 
600 0 
500 0 
400 0 
300 0 
200 0 
100 0 
0 
INDIA 
Major emission classes 
7000 
6000 
5000 
4000 
3000 
2000 
100...
How can we address these questions and overcome the complications? 
Model. 
+Upscaling 
Field 
Measurements 
Process Studi...
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R Wassman quantification of ghg emissions from rice july 2010

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R Wassman quantification of ghg emissions from rice july 2010

  1. 1. Methodological aspects of quantifying GHG emissions from rice fields Reiiner Wassmann Internatiionall Riice Research Instiitute
  2. 2. ‘Closed Chamber‘ Method Fan Fan time concentration Transparent chamber Septum Syringe or Vacutainer tube
  3. 3. Diurnal patterns: algorithms F = 13.2 F6 + 4.6 F12 + 7.2 F18 16 14 12 10 8 6 4 2 0 Mature rice plants 0 6 12 18 24 Buendia et al. 1997 Daytime CH4 emission (mg m-2 h-1) Young rice plants R2 > 0.98 F = 10.4 F6 + 5 F12 + 7.4 F18
  4. 4. Seasonal patterns: Mid-season drainage water level (cm) / line Eh (mV) / dots 100 0 -100 -200 water level (cm) / line Eh (mV) / dots 30 20 10 1400 1200 1000 800 600 400 200 Days after planting 30 20 10 0 20 40 60 80 100 120 -300 1400 1200 1000 800 600 400 200 0 methane emission (mg CH4 m-2 d-1) 20 40 60 80 100 120 0 20 40 60 80 100 120 100 0 -100 -200 -300 0 methane emission (mg CH4 m-2 d-1) 20 40 60 80 100 120 Field experiment at Hangzhou, China (Lu et al. 2000)
  5. 5. Field stations of the Intenational Rice Research Institute (projects funded by US-EPA and UNDP/ GEF) IrIrrrigigaatetedd RRaaininfefedd DDeeeeppwwaateterr IRRI/ Los Banos
  6. 6. a b View of the field chambers (for flooded/ non-flooded condition)
  7. 7. Schematic Presentation of Automated System I) Field chambers II) Pneumatic unit III) Sample transfer IV) Calibration gas V) Injection loop/ GC V) Data acqu./ control
  8. 8. Urea (Nueva Ecija) 1200 1000 800 600 400 200 0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC start of rainy season (May 15) end of rainy season (Nov 15) 1 15 29 43 57 71 85 99 113 127 141 155 169 183 197 211 225 239 253 267 281 295 309 323 337 351 365 SFLUX 1 SFLUX 2 VEG1 REP1 RIP1 VEG REP RIP 0.13 SF1 0.30 SF1 0.57 SF1 0.16 SF2 0.37 SF2 0.46 SF2 PRE1 0.003 SF1 PHV1 0.02 SF1 PRE2 0.02 SF2 PHV2 0.06 SF2 DRY FLX=0 PHV3 0.001SF2 Cropping calendar (Philippines)
  9. 9. 700 0 600 0 500 0 400 0 300 0 200 0 100 0 0 INDIA Major emission classes 7000 6000 5000 4000 3000 2000 1000 0 INDONESIA 700 0 600 0 500 0 400 A B2 C D E F G B1 red: irrigated rice green = rainfed rice blue = deepwater rice
  10. 10. How can we address these questions and overcome the complications? Model. +Upscaling Field Measurements Process Studies Process Studies

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