Degradation of palm swamp peatlands in the Peruvian Amazon severely...

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Kristell Hergoualc’h, J van Lent, R Bhomia, N Dezzeo, J Grandez, M Lopez
LV Verchot
Degradation of palm swamp peatlands in...

Peruvian peatlands
 Key contributor tropical peatlands
Gumbricht et al (201
 Amazonian peatlands mainly Mauritia
flexuos...

Objectives
 How do peat N2O and CH4 fluxes and
the components of the peat CO2
budget vary spatially at the
microscale and...

Experiment
Highly
deg.
Medium
deg.
Intact
 Iquitos, Northern Peruvian
Amazon
 Degradation gradient
I: Intact
mD: medium ...

Experiment
 Disaggregation by microtopography (hummock vs. hollow), and palm
status (live vs. cut)
 Degradation impacts ...

Soil N2O fluxes
 Microscale
b, 2
a
0
2
4
6
8
10 Intact
b, 1
a
b
a
0
2
4
6
8
10 Medium Degradation
Live hummock Live hollo...

Controls of soil N2O fluxes
 Water-filled pore space (WFPS)
 Water table level (WT)
 WT and Net
nitrification

Soil CH4 fluxes
a, 1
b, 2
0
250
500
750
1000
1250
Intact
b, 2
a, 1
b
a
Medium Degradation
Live hummock Live hollow
Cut hum...

Controls of soil CH4 fluxes
 Water table level (WT)
 Air temperature
 Soil net nitrification rate

Soil heterotrophic respiration
No difference between microtopographies
Sh hDeg > Sh Intact, mDeg
 Macroscale
Sh hDeg (9.0...

Controls of soil heterotrophic respiration
 Water-filled pore space (WFPS)
Sh = -0.2 x WFPS + 37.8
R² = 0.46
15
20
25
30
...

Soil C inputs (Mg C ha-1 y-1)
 Litterfall
Dominated by tree leave fall (80%)
Litterfall hDeg (2.3) < Litterfall Intact (5...

Peat C budget
Computed in year 2 when all components were monitored
Dissolved organic C: Default value from Southeast Asia...

Peat GHG budget
→ CH4 contributes importantly to the peat GHG budget
→ In its natural state, the soil in palm swamp peatla...

Concluding remarks
 Impacts forest degradation on GHG emissions in tropical peatlands
→ Complex to monitor: Micro- to mac...

Thank you! Questions?

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