presentation

1. Effects of rewetting of peatland
on GHG fluxes from the soils
with different land-cover types
Iska Lestari
Daniel Murdiyarso
Muhamad Taufik
Putu Santikayasa

2. Research
questions
• Following an extensive
tropical PSF conversion,
to what extent does peat
rewetting reduce GHG
emission rates?
• What does it imply in terms
of new landscape and from
land manager’s
perspectives?

3. cifor.org
blog.cifor.org
ForestsTreesAgroforestry.org
Oil Palm Mixed forest
Canal blocking

5. Groundwater level before and after
blocking
-120.0
-110.0
-100.0
-90.0
-80.0
-70.0
-60.0
-50.0
-40.0
-30.0
-20.0
-10.0
-
0
10
20
30
40
50
60
70
80
90
100
GWL
(cm)
Rainfall
(mm)
Curah Hujan GWL Mixed GWL Rubber

6. Measuring CO2 flux
Rh Rt

7. Results
• CO2 fluxes before and after canal blocking
o reforested areas 10.93  3.57 Mg CO2 ha-1yr-1
o oil palm 16.66  10.47 Mg CO2 ha-1yr-1
o rubber plantations 23.70  15.27 Mg CO2 ha-1yr-1
• Increasing trends for CH4 fluxes after blocking
o reforested areas -0.10 + 0.84  8.02 + 3.28 mg m-2 hr-1
o oil palm 0.34 + 4.52  5.36 + 6.13 mg m-2 hr-1
o rubber plantations 0.50 + 2.70  0.64 + 1.19 mg m-2 hr-1
• Decreasing trends for N2O fluxes after blocking
o reforested areas 0.40 + 0.84  0.20 + 0.27 mg m-2 hr-1
o oil palm 0.40 + 0.84  -0.45 + 2.08 mg m-2 hr-1
o rubber plantations 0.40 + 0.84  2.15 + 0.25 mg m-2 hr-1

8. Emissions
(Mg
ha
-1
yr
-1
)
Rubber
Oil
palm
Mixed
forest Before After
10.93
3.57
16.66
10.47
23.70 15.27

9. Concluding remarks
• The response of GHG fluxes to rewetting differ
between land-use types. It probably caused by
a combination of canopy cover (soil
temperature) and rooting system.
• CO2 emission can be reduced as much as 67%
when the canoy cover is dense and root
system is shallow as shown in reforested area.

10. cifor.org
blog.cifor.org
ForestsTreesAgroforestry.org
Thank you