age effects of annual carbon fluxes: ongoing synthesis work
DESCRIPTION
How do GPP and R change with age? A fundamental theory in ecological succession Model A: modified from Odum 1967 Model B: modified from Ryan et al. 1997TRANSCRIPT
Age effects of annual carbon fluxes:Ongoing synthesis work
Jim TangInstitute of Plant Biology and Conservation
Chicago Botanic Garden [email protected]
Forest age
Ann
ual c
arbo
n flu
x GPP
R
Ann
ual c
arbo
n flu
x
Forest age
GPP
R
NPP
NPP
A
B
Model A: modified from Odum 1967
Model B: modified from Ryan et al. 1997
How do GPP and R change with age? A fundamental theory in ecological succession
How do GPP and R change with age?
• We are not able to quantify the changes of GPP and R with age.
• Therefore, most of ecosystem carbon models are not able to include age as a driving variable.
Young Hardwood Deciduous Broadleaf aspen, red maple 3Intermediate Hardwood Deciduous Broadleaf aspen 17
Mature Hardwood Deciduous Broadleaf red maple, sugar maple, aspen, birch 65Willow Creek Deciduous Broadleaf sugar maple, basswood, green ash 70
Young Red Pine Evergreen Needleleaf red pine, jack pine 8Young Jack Pine Evergreen Needleleaf jack pine 14
Intermediate Red Pine Evergreen Needleleaf red pine 21Mature Red Pine Evergreen Needleleaf red pine, aspen 63
WLEF Mixed Forest N. hardwoods, aspen, forested wetlands 70UMBS Mixed Forest aspen, white pine, red oak, sugar maple 90
Sylvania Mixed Forest eastern hemlock, sugar maple, birch 350Pine Barren B Shrub sweet fern, black cherry, willow, r. pine 2Pine Barren A Shrub sweet fern, black cherry, willow, r. pine 12
Lost Creek Wetland alder, willow shrubs 20
Site Dominant cover Age
ChEAS sites
More clearcut and wetland sites?
Age (year)
0 20 40 60 80 100 350
Car
bon
flux
(g C
m-2
y-1
)
-800
-600
-400
-200
0
200
400
600
800
1000
1200Deciduous NEEEvergreen NEEMixed NEEShrub NEEDeciduous GEPEvergreen GEPMixed GEPShrub GEPDeciduous EREvergreen ERMixed ERShrub ER
WLEF
NEE, GEP and R vs. age in ChEAS sites
2002-2003 data
X Data
0 20 40 60 80 100
NE
E/G
EP
-0.2
0.0
0.2
0.4
0.6
0.8
1.0
WU
E (g
C k
g-1 H
2O)
0
1
2
3
4
5
6
7
Deciduous CUEEvergreen CUEShrub CUEMixed CUEDeciduous WUEEvergreen WUEMixed WUEShrub WUE
WLEF
NEE/GEP (CUE) and WUE vs. age in ChEAS sites
Global context
http://www.daac.ornl.gov/FLUXNET
Boreal
Car
bon
flux
(gC
m-2
y-1
)
0
1000
2000
3000
4000
5000
GPPNPP
MediterraneanGPPNPP
Temperate
Age (year)0 100 200 300 400 500
Car
bon
flux
(gC
m-2
y-1
)
0
1000
2000
3000
4000
5000
GPPNPP
Tropical
Age (year)
0 100 200 300 400 500
GPPNPP
Global GPP and NPP vs. age
0.95 quantile regression
Data source: Sebastiaan et al. 2007
Annual mean temperature (oC)
-10 0 10 20 30
Car
bon
flux
(gC
m-2
y-1
)
0
1000
2000
3000
4000
5000
Boreal GPPBoreal NPPMediterranean GPPMediterranean NPPTemperate GPPTemperate NPPTropical GPPTropical NPP
Global GPP and NPP vs. temperature
Annual precipitation (mm)
0 1000 2000 3000 4000 5000 6000
Car
bon
flux
(gC
m-2
y-1
)
0
1000
2000
3000
4000
5000
Boreal GPPBoreal NPPMediterranean GPPMediterranean NPPTemperate GPPTemperate NPPTropical GPPTropical NPP
Global GPP and NPP vs. precipitation
Forest age
Ann
ual c
arbo
n flu
x GPP
R
Ann
ual c
arbo
n flu
x
Forest age
GPP
R
NPP
NPP
A
B
Model A: modified from Odum 1967
Model B: modified from Ryan et al. 1997
How do GPP and R change with age? A fundamental theory in ecological succession