Carbon Sequestration in Coastal Freshwater Peatlands: A ... · Carbon Sequestration in Coastal...
Transcript of Carbon Sequestration in Coastal Freshwater Peatlands: A ... · Carbon Sequestration in Coastal...
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Carbon Sequestration in Coastal Freshwater
Peatlands: A Market Credit Tool for Restoration
Funded by
U.S. Fish and Wildlife Service, Region 4
&
The Nature Conservancy, NC Chapter
Curtis Richardson1, Neal Flanagan1, Hongjun Wang1, & Mengchi Ho1
&
Sara Ward2, and Tom Augspurger2
1Duke University Wetland Center, Nicholas School of the Environment
2U.S. Fish and Wildlife Service, Region 4
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Outline
• Importance of restoring agricultural peatlands and drained wetlands
• Conceptual C credit accounting plan USFWS
• Experimental site description
• Questions
– Does hydrologic restoration increase GHG flux?
– Does restoration increase C and N Sequestration?
– What controls C sequestration ?
• Conclusions
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(325 Tg C)
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Drained and converted organic soils in agriculture that have potential for increased greenhouse gas losses
(unpublished map from NC RAMSAR working group)
PLNWR
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Utrient
Wetland Restoration
Recommended expansion of restoration at Pocosin Lakes NWR
Why?
• Peatland restoration allows
substantive C and N
sequestration benefits
• Refuge habitat improvement
• Reduces nutrient runoff to estuaries
Photo: S.Ward, USFWS
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(Peat Fire June –September 2008)
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(How much C was lost?)
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(NC Pocosin Fire 2008)
9.9 Tg C lost
16,814 ha Burned
Mickler and Welch 2012
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Large Scale Hydrology-Carbon
Sequesration Experiment
Pocosins Lake National Wildlife
Refuge
in
Coastal NC
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Reference
Restored
Restored
Restored
Drained
Drained (F1)
Experimental Design
Fire
Boundary
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Gordonia lasianthus
Pinus serotina
Zenobia pulverulenta
Pinus taeda
Ilex glabra
Morella cerifera
Pteridium aquilinum0
500
1000
1500
2000
2500
Litt
er
acc
um
ula
tion
ra
te (
kg C
hr-1
yr-1
)
Reference
Restored
Drained
Litter Accumulation Rates in Pocosins by Species & Hydrology Treatments
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40
50
60
70
80
90
100
0 0.2 0.4 0.6 0.8 1 1.2
Ma
ss r
em
ain
ing
(%
ori
gin
al)
Time (yr)
SPDNLTPREFB7
C2
C14
Morella
50
55
60
65
70
75
80
85
90
95
100
0 0.2 0.4 0.6 0.8 1 1.2
Ma
ss r
em
ain
ing
(%
ori
gin
al)
Time (yr)
SPDNLTPREFB7
C2
C14
Ilex
Decomposition rates in drained, restored and reference pocosins
(Preliminary data from Tim Moore, McGill)
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0.0
5.0
10.0
15.0
20.0
25.0
REF C2_REST C14_DRAIN
mg
/l
DIC
REF
C2_REST
C14_DRAIN
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0.0
20.0
40.0
60.0
80.0
100.0
120.0
140.0
REF C2_REST C14_DRAIN
mg
/l
TOC
REF
C2_REST
C14_DRAIN
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50% 80%
- -8x
Incomplete C Budget
100 Years left
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Does Hydrologic Restoration Alone Control GHG Flux?
& Which GHG is the
Dominant Contributor?
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Average By Treatment
-160
-140
-120
-100
-80
-60
-40
-20
0
20
01
/20
11
02
/20
11
04
/20
11
06
/20
11
07
/20
11
09
/20
11
11
/20
11
12
/20
11
RESTORED
DRAINED
REFERENCE
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Sep.2011 Nov. 2011 Jan. 2012
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
CO
2 (m
g m
-2 h
-1)
Month
Drained sites
Reference sites
Restored sites
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Sep.2011 Nov. 2011 Jan. 2012
0
100
200
300
400
500
600
700
800
CO
2 e
qu
iva
len
ts (
mg
m-2 h
-1)
Month
N2O
CH4
CO2
Drained sites
Sep.2011 Nov. 2011 Jan. 2012
0
100
200
300
400
500
600
700
CO
2 equ
ival
ents
(m
g m
-2 h
-1)
Month
N2O
CH4
CO2
Restored sites
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Wet Dry Comparison of GHG
-200 -180 -160 -140 -120 -100 -80 -60 -40 -20 0
0
200
400
600
800
1000
1200
1400
Drained sites
Reference sites
Restored sites
CO
2 (
mg
m-2 h
-1)
Water level (cm)
y = 3.9591x + 257.77
R2 = 0.6001
Dry Aug.
Wet Sep.
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Average By Treatment
-160
-140
-120
-100
-80
-60
-40
-20
0
20
01
/20
11
02
/20
11
04
/20
11
06
/20
11
07
/20
11
09
/20
11
11
/20
11
12
/20
11
RESTORED
DRAINED
REFERENCE
Drought Effects ?
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Questions
• How does this peat exist under such low summer water tables?
• What controls CO2 production in unsaturated peatlands? Phenolic cpds possible microbial block (Bridgham and Richardson, 2003)
• What are the responses of these peatlands to drought and can they resist drought effects? (Wang Ho and Richardson 2012)
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Drought Low precipitation,
drainage for agriculture and forest
Aerobic decay
More CO2
Fenner and Freeman, 2011
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Drought unlocks carbon historically restored in boreal peatland
Fenner and Freeman, 2011
Generally, such phenomenon occurs in
saturated peatlands,
However, unsaturated
peatlands?
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High nitrogen in natural site Low C quality (C/N low) in drained site
1/28 2/12 2/27 3/14 3/29 4/13 4/28 5/13 5/28 6/12 6/27
1
2
3
4
5
6
CO
2 e
mis
sio
n (m
ol m
-2 s-1
)
Date
Drained
Natural
Restored
Figure 3. Temporal variation of CO2 emission during drought incubation of peat monoliths from drained, natural and restored Pocosin peatland sites.
No effects
(Wang , Ho and Richardson in Prep, Poster 336)
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10
20
30
40
50
60
70
80
90
B
a
B
bB
c
B
a
A
a
A
a
B
b
A
bA
b
AB
c
A
c
So
il M
ois
ture
(v
%)
drained
Natural
restored
A
c
A
200
300
400
500
600
700
800
900
1000
B A
a
A
a
A
aAB
a
B
a
AB
a
B
a
B
abB
b
AB
a
B
b
B
b
So
lub
le p
oly
ph
en
ol
(g
C g
-1 d
ry s
oil)
1-Mar 31-Mar 1-May 1-Jul0
100
200
300
400
500
600
700C
A
a
A
a
A
a
A
aA
aA
a
A
a
A
a
B
a
A
aA
a
B
a
La
bile
po
lysa
cch
ari
de
(g
C g
-1 d
ry s
oil)
Date
1-Mar 31-Mar 1-May 1-Jul
1.0
1.5
2.0
2.5
3.0
3.5
4.0D
A
b
A
b
A
bA
b
A
a
A
a
A
a
A
a
A
a
Ph
en
ol o
xid
ise
act
ivity
(mm
ol d
iqc
g-1 m
in-1 )
Date
n/a
Figure 1. Temporal variations of soil moisture (A), soluble and polyphenol (B), labile polysaccharide (C) and phenol oxidase activity(D) during the drought incubation of peat monolith from natural, drained & restored Pocosin sites.
(Wang , Ho and Richardson in Prep, poster 336)
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2.5 2.6 2.7 2.8 2.9 3.0 3.1
0.5
1.0
1.5
2.0
2.5
3.0
0 20 40 60 80 100
B
CO
2 e
mis
sion (m
ol m
-2 s
-1)
Log (Soluble polyphenol (g g-1 dry soil))
r2 = 0.694
p < 0.0001
A
Inorganic nitrogen (g N g-1 dry soil)
r2 = 0.4488
p < 0.001
Figure 4. Soluble polyphenol (A) and inorganic nitrogen (B, NH4++ NOx
-) vs. CO2
emission during the initial 60-day drought incubation of all peat monoliths
(Wang , Ho and Richardson in Prep, poster 336)
Phenolics-latch for CO2 production
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Properties of Soil and Plants in the Pocosin Study Sites in Coastal NC
(Wang , Ho and Richardson in Prep, Poster 336)
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Conclusion and application Build-up polyphenol inhibit CO2 production under drought
(weakens drought effects)
Moderate drought might increase C accumulation (similar with restored site results)
Altered species composition caused by drainage or by severe drought results in decreased polyphenol in soil & increased CO2 flux
Nitrogen deposition stimulates CO2 flux
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Major Peatlands in the SE Coastal
Plain of the U.S.
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Potential Peatland Restoration sites
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Any Questions?