Saltwater intrusion alters nitrogen and carbon export from a ......Ardon Title Saltwater intrusion...
Transcript of Saltwater intrusion alters nitrogen and carbon export from a ......Ardon Title Saltwater intrusion...
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Saltwater intrusion alters nitrogen and carbon export from a restored coastal plain wetland
(North Carolina, USA)
Marcelo Ardón1, Emily S. Bernhardt2, Ashley Helton2, Amy Burgin3, Robert Payn4, and Geoffrey Poole4
1. Department of Biology, East Carolina University, Greenville NC, USA 2. Biology Department, Duke University, Durham NC, USA 3. School of Natural Resources, University of Nebraska-Lincoln NE, USA 4. Department of Land Resources and Environmental Sciences, Montana State University, Bozeman, MT, USA
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Wetland restoration
Agriculture
Development
Restoration
Carter 1975 Science
Sea level rise
Climate driven changes in hydrology
How do drought and saltwater intrusion alter carbon and nitrogen retention in a coastal plain freshwater restored
wetland?
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Timberlake Restoration Project
• Privately owned 1000ha mitigation bank • Focus 440ha agricultural field (formerly pumped) • Two constrained inflows – single outflow • Surrounded by preservation wetlands • <5 m range in surface elevation • Freshwater with wind-driven tides & bidirectional flow
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OUTFLOW
Mass balance
MIDPOINT 2 INFLOWS
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Water budgets
Inflows
Inflows
2/07 8/07 2/08 8/08 2/09 8/09 2/10 8/10 2/11 8/11 Dai
ly d
isch
arge
(m3 d
ay-1
)
-40000
-20000
0
20000
40000
InflowPump station
Outflow
2/07 8/07 2/08 8/08 2/09 8/09 2/10 8/10 2/11 8/11
Dai
ly d
isch
arge
(m3 d
ay-1
)
-200000
20000400006000080000
100000
Rainfall
Date
2/07 8/07 2/08 8/08 2/09 8/09 2/10 8/10 2/11 8/11
Rai
nfal
l (m
m)
0
50
100
150
200
Ardón et al. 2010 Ecosystems
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3/07 9/07 3/08 9/08 3/09 9/09 3/10 9/10 3/11 9/11
Wat
er e
leva
tion
(m)
-0.8
-0.4
0.0
0.4
0.8
1.2
Con
duct
ivity
(mS/
cm3 )
0
6
12
Water elevationInflow MidpointOutflow
Drought-induced saltwater intrusion 5.0
Outflow
Midpoint Inflows SWI
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Cl- concentrations are higher at the soil surface
Transect 1
Depth (cm)
20 40 60 80 100 120
Cl (
mg/
L)
0
500
1000
1500
Transect 3
Depth (cm)
20 40 60 80 100 120
Cl (
mg/
L)
0
50
100
150
200
250
300
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Outflow
Cl (mg/L)
0 1000 2000 3000 4000
SO4
(mg/
L)
0
100
200
300
400
500
600
Midpoint
Cl (mg/L)
0 1000 2000 3000 40000
100
200
300
400
500
600
Inflow
Cl (mg/L)
0 1000 2000 3000 40000
100
200
300
400
500
600
Cl- travels farther upstream than SO4
R2=0.89 slope= 0.10
R2=0.81 slope= 0.04
R2=0.24 slope= 0.02
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oxic anoxic
SO42-
OC
CO2
H2S
CO2
CARBON NITROGEN SULFUR IRON PHOSPHORUS
Fe-PO43-
Fe3+ PO43-
Fe2+
Fe-S
N2, N2O
NO3- NH4
+,N2
Predictions
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oxic anoxic
SO42-
OC H2S
CO2
CARBON SULFUR
POC
C+
Predictions DOC
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oxic anoxic
SO42-
OC
CO2
H2S
CO2
NITROGEN SULFUR
N2, N2O
NO3- NH4
+,N2
Predictions
CARBON
DOC
NH4
C+
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Budget year
2007 2008 2009 2010 2011
DO
C (k
g ha
-1 y
-1)
0
50
100
150
200
250InputsOutputs
Outflow
Date
2/07 8/07 2/08 8/08 2/09 8/09 2/10 8/10 2/11 8/11 2/12
DO
C (m
g/L)
0
10
20
30
40
50
60
70
80
Con
duct
ivity
(mS/
cm)
0
2
4
6
8
10
12DOCConductivity
Source of DOC DOC export with SWI
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POC formation with increasing conductivity Floc yeah!
Conductivity (mS/cm)
0 2 4 6 8 10 12 14
POC
form
atio
n (%
initi
al D
OC
)
0
5
10
15
20
24º C30º C
+ Conductivity
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2007 2008 2009 2010 2011
NH
4 (k
g ha
-1 y
-1)
0
2
4
6
8
10 2007 2008 2009 2010 2011
NO
3 (k
g ha
-1 y
-1)
0
2
4
6
8
10InputsOutputs
Budget year
2007 2008 2009 2010 2011
TDN
(kg
ha-1
y-1
)
0
5
10
15
20
NO3 sink
TDN sink
NH4 sink/source
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[NH4] with Conductivity
Outflow
Date
2/07 8/07 2/08 8/08 2/09 8/09 2/10 8/10 2/11 8/11 2/12
NH
4 (m
g/L)
0
2
4
6
8
10
Con
duct
ivity
(mS/
cm)
0
2
4
6
8
10
12NH4
Conductivity
Outflow
1/07 7/07 1/08 7/08 1/09 7/09 1/10 7/10 1/11 7/11 1/12
NH
4 (k
g m
onth
-1)
0
50
100
150
200
250
300
Con
duct
ivity
(mS/
cm)
0
2
4
6
8
10
12NH4 Conductivity
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Control (DI)
Sep Oct Nov Dec
Cl (
mg/
L)
0
1000
2000
3000
4000
DroughtFlooded
ASW with SO4
Sep Oct Nov Dec 0
1000
2000
3000
4000ASW without SO4
Sep Oct Nov Dec
Y D
ata
0
1000
2000
3000
4000SO4
Date
Sep Oct Nov Dec 0
1000
2000
3000
4000
Control (DI)
Sep Oct Nov Dec
SO4
(mg/
L)
0
100
200
300
400
DroughtFlooded
ASW with SO4
Sep Oct Nov Dec 0
100
200
300
400ASW without SO4
Sep Oct Nov Dec 0
100
200
300
400SO4
Date
Sep Oct Nov Dec 0
100
200
300
400
Manipulative Experiments Hydrology x Water chemistry
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SW decreased DOC concentrations
Control (DI)
Sep Oct Nov Dec
DO
C (m
g/L)
0
20
40
60
80
100
120
DroughtFlooded
ASW with SO4
Sep Oct Nov Dec 0
20
40
60
80
100
120ASW without SO4
Date
Sep Oct Nov Dec 0
20
40
60
80
100
120SO4
Sep Oct Nov Dec 0
20
40
60
80
100
120
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SWI with and without SO4 increase NH4
+ concentrations
Control (DI)
Sep Oct Nov Dec
NH
4 (m
g/L)
0
1
2
3
4
5
Drought
Flooded
ASW with SO4
Sep Oct Nov Dec 0
10
20
30
40ASW without SO4
Sep Oct Nov Dec 0
10
20
30
40
SO4
Date
Sep Oct Nov Dec 0
1
2
3
4
5
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Predictions
• DOC decline • NH4 increase
Microcosm
Cl (mg/L)
0 500 1000 1500 2000 2500 3000 3500
NH
4 (
mg
/L)
0
5
10
15
20Field data
Cl (mg/L)
0 500 1000 1500 2000 2500 3000 3500
NH
4 (m
g/L)
0
1
2
3
4
5
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Conclusions • Saltwater intrusion decreases DOC export and N
retention
• Saltwater intrusion can lead to NH4 release
• Caution for wetland restoration and hydrologic reconnection
• Important to understand both the biotic and
geochemical effects of saltwater intrusion
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Acknowledgments • Great Dismal Swamp Mitigation Bank
• Thanks to: K.R. Balance, R. Bier, M. Burke, Bernhardt Lab, Doyle Lab, Jackson
Lab, Wright Lab, and Duke University Wetland Center
• External funding: GDSMB, EPA STAR, NC WRRI, NC EEP, DOE NICCR, NCALM, Lindbergh Foundation, NSF, and NSF Postdoc Fellowship
Rob Payn Ashley
Helton
Geoff Poole
Amy Burgin
Jen Morse
Marcelo Ardon