0890 Methane and Nitrous Oxide Emissions from Paddy Rice Fields in Indonesia- Comparison of SRI and...
12
Methane and Nitrous Oxide Emissions from Paddy Rice Fields in Indonesia - Comparison of SRI and surrounding conventional fields - Tokyo University of Agriculture and Technology: Dr. KIMURA Sonoko Dorothea SRI Experiment Plot +Farmers Field Tabo-Tabo Jampue Langunga Penarungan Sungsang
-
Upload
sri-rice-ciifad-cornell-university -
Category
Business
-
view
14 -
download
5
description
Presenter: Kimura Sonoko Dorothea GHG. Tokyo University of Agriculture and Technology
Transcript of 0890 Methane and Nitrous Oxide Emissions from Paddy Rice Fields in Indonesia- Comparison of SRI and...
Methane and Nitrous Oxide Emissions from Paddy Rice Fields in Indonesia
- Comparison of SRI and surrounding conventional fields -Tokyo University of Agriculture and Technology: Dr. KIMURA Sonoko Dorothea
SRI Experiment Plot
+Farmers Field
Tabo-TaboJampue
Langunga
PenarunganSungsang
MethodClosed-chamber method
Features: 30cm×30cm×60cm dimensions, equipped with thermometer, pressure bag, and gas sampling tube (foldable)
Measurements taken at 0, (10) and 20-minute intervals → 10ml vacuum vial
Each field: 2-3 replications
N2O ＆ CH4 → measured by GC-ECD ＆ GC-FID
Parameters: soil temperature, stem number, days after planting, plant height, variety etc.
Dates: 2008 / 3 / 20-23
Lombok SRI field （ Nippon Koei ）
SRISRI Non-SRINon-SRI
08/03/20
0
50
100
150
200
250
300C
onv
SR
I
Con
v
SR
I 1
SR
I 2
Con
v
SR
I
Con
v
SR
I
Con
v
SR
I
Con
v
SR
I
Con
v
SR
I
SRI Lombok Tabo-Tabo Jampue Langunga Penarungan
Sungsang
Methane FluxC
H4
Flu
x
(mg
C m
-2 h
-1)
Error bar stands for standard deviation
Nitrous Oxide FluxN
2O F
lux
(μg
N m
-2 h
-1)
-300
-200
-100
0
100
200
300C
onv
SR
I
Con
v
SR
I 1
SR
I 2
Con
v
SR
I
Con
v
SR
I
Con
v
SR
I
Con
v
SR
I
Con
v
SR
I
SRI Lombok Tabo-Tabo Jampue Langunga Penarungan
Sungsang
Error bar stands for standard deviation
CH4 flux from intermittent irrigation
Figure 2. Effect of water management on CH4 emission from a rice paddy field. The arrows indicate period of midseason drainage in the intermittent irrigation plot and the timing of final drainage in both of the plots. ( Yagi et al. 1997 ）
Influencing Parameters
Days after transplanting Straw number Time of day
CH4 flux (mg C m-2 h-1)
0
50
100
150
200
250
0 50 100 150
Conv
SRI
0
50
100
150
200
250
0 20 40 60
Conv
SRI
0
50
100
150
200
250
8:00
10:0
0
12:0
0
14:0
0
16:0
0
18:0
0
20:0
0
Conv
SRIJampue
0
50
100
150
200
250
0 50 100 150
Drain
Log.
Influencing Parameters
Days after transplanting Straw number Time of day
CH4 flux (mg C m-2 h-1)
Jampue
Logging
0
50
100
150
200
250
0 20 40 60
Drain
Log.
0
50
100
150
200
250
8:00
10:0
0
12:0
0
14:0
0
16:0
0
18:0
0
20:0
0
Drain
Log.
Conclusions
Conventional Fields?
Almost same planting density
Intermittent irrigation
Main difference: Seedling age
Measuring of CH4 and N2O flux
Survey: March 20-23
Emission of gas is influenced by: Irrigation timing
Time of dayGrowth stage
Problems
CH4 FluxWater status at the time of sampling had a greater influence on CH4 flux than did the difference between SRI and conventional methods. However, since SRI fields tend to be drained, CH4 flux tended to be higher in conventional fields. Highest CH4 emission was found during early growing stages with conventional methods.
N2O FluxHigh variability. Unexpected negative flux in some fields. SRI fields tended to emit more N2O than conventional fields, but the values are in the range found for conventional paddy fields (FM Honmachi 2007;
total emission 0-0.2 kg N ha-1).
Conclusion
