water stress sites site nameyear de-gri- grillenburg2005 de-hai-...
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Water stress sitesSite name Year
DE-Gri- Grillenburg 2005
DE-Hai- Hainich 2000,2001,2002,2003,2004,2005
ES-LMa-Las Majadas del Tietar 2004,2005
DK-Sor-Soroe 1996,1997,1998,1999,2000,2001, 2002,2003,2004,2005,2006
FI-Kaa-Kaamanen 2000,2001,2002,2003,2004,2005
PT-Esp-Espirra 2002,2003,2004
PT-Mi1-Mitra II (Evora) 2003,2004,2005
PT-Mi2-Mitra IV (Tojal) 2004,2005,2006
FR-Hes -Hesse 1997,1998,1999,2000,2001,2002, 2003,2004,2005,2006
FR-Pue-Puechabon 2000,2001,2002,2003,2004,2005, 2006
FR-LBr-Le Bray 1996,1997,1998,2000,2003,2005, 2006
HU-Bug -Bugac 2002,2003,2004,2005,2006
IT-Cpz-Castelporziano 2000,2001,2002,2003,2004,2005
DE-Tha -Tharandt 1996,1997,1998,1999,2000,2001, 2002,2003,2004,2005
IT-Ro1-Roccarespampani 1 2000,2001,2002,2003,2004,2005, 2006
IT-Ro2 – Roccarespampani 2 2002,2003,2004,2005,2006
USA-Blodgett 1999,2000,2001,2002,2003,2004,2005
USA-Freeman 2004,2005,2006
LAI, SAIPhenologyLeaf physiology
Sunlit
Shaded
1 Canopy Layer
PIXGRO Canopy
Day of Year
-85
-75
-65
-55
-45
0 60 120 180 240 300 360
Day of Year
2003
200x?
Empiricalor
FluxnetSoil
Mat
ric
po
ten
tial
(cm
)ABA
SIGNAL
Separation of COSeparation of CO22 exchange by components exchange by components
of a herbaceous vegetation mosaic and up-scalingof a herbaceous vegetation mosaic and up-scalingvia chamber plus eddy covariance measurements via chamber plus eddy covariance measurements
in the Portuguese montadoin the Portuguese montado
John Tenhunen, Yuelin Li, Heydar Mirzaei, Mir Zaman HussainDepartment of Plant Ecology, University of Bayreuth, Germany
Lukas Siebicke, Thomas FokenDepartment of Micrometeorology, University of Bayreuth, Germany
Joao Banza, Joao PereiraInstituto Superior de Agronomia, Technical University of Lisbon, Portugal
Luis Aires, Casimiro PioCESAM and Department of Environment, University of Aveiro, Portugal
2001-2005
B
Jan.
Feb
.M
ar.
Apr
.M
ayJu
neJu
lyA
ug.
Sep
t.O
ct.
Nov
.D
ec.
Dai
ly a
ver
age
FN
EE (
g m
-2)
-4
-2
0
2
4
Mitra, Portugal
Tem
per
atu
re (
0C
)
0
10
20
30
40
50 1961-1990
Pre
cip
itat
ion
(m
m)
0
20
40
60
80
100
A
March April May
Nit
rog
en (
g m
-2)
0
5
10
15
20
March April May
Gre
en b
iom
ass
(g m
-2)
0
200
400
600Low open siteHigh open siteUnderstory site
Mitra, Portugal 2006
Period of major carbon uptake into the montado system
An example of `open vegetation` - a classical ecosystem typerelated to changing water balance, e.g.,
forest grassland transition, true savanna, desert shrublands,taiga forest limit
Ca.
100
m
E
L
UH
H
B
CA
DOY=99
CO
2 F
lux
(m
ol m
-2 s
-1)
-40
-30
-20
-10
0
10
20
30
DOY=103
-40
-30
-20
-10
0
10
20
30
-10
0
10
20
30
40
Q (mol m-2 s-1)
0 500 1000 1500 2000
FG
PP ( m
ol m
-2 s
-1)
-10
0
10
20
30
40
-10
0
10
20
30
40
DOY=98
-40
-30
-20
-10
0
10
20
30
FNEE
FRE
High open site
Understory site
Low open site
Mitra, Portugal 2006
Time
06:00 09:00 12:00 15:00 18:00
Col 2 vs Col 7
Day of Year
60 80 100 120 140
mo
l C
O2 m
-2 s
-1)
0
5
10
15
Mitra, Portugal 2006
Col 2 vs Col 4
(
)
m
ol
CO
2 m
-2 s
-1)
0
15
30
45 Low open siteHigh open siteUnderstory site
mo
l / m
ol)
0.00
0.04
0.08
Mitra, Portugal 2006
Lowopen site
FN
EE m
easu
red
( m
ol m
-2 s
-1)
-30
-20
-10
0
10
20
30
y = 0.94xR2 = 0.88
A
Understorysite
FNEE modelled (mol m-2 s-1)
-30 -20 -10 0 10 20
FN
EE m
easu
red
( m
ol m
-2 s
-1)
-30
-20
-10
0
10
20
30C
y = 0.99xR2 = 0.75
Highopen site
FN
EE m
easu
red
( m
ol m
-2 s
-1)
-30
-20
-10
0
10
20
30
y = 0.99xR2 = 0.88
B
Day of Year
60 80 100 120 140
To
tal
nig
htt
ime
FR
E,
(g m
-2)
0
1
2
3
4
5
Low open siteHigh open siteUnderstory
Mitra, Portugal 2006
B
Day of Year60 80 100 120 140
To
tal
nig
htt
ime
FR
E,
(g m
-2)
0
1
2
3
4
5
Low open siteEddy site
A C
Day of Year60 80 100 120 140
Dai
ly F
NE
E,
(g m
-2)
-10
-8
-6
-4
-2
0
2
4
Low open siteEddy site
D
Day of Year60 80 100 120 140
Dai
ly F
NE
E,
(g m
-2)
-10
-8
-6
-4
-2
0
2
4
Low open siteHigh open siteUnderstory site
Day of Year
60 80 100 120 140
Dai
ly F
NE
E (
g m
-2)
-4
-2
0
2
4
Herbaceous componentMontado ecosystem
Mitra, Portugal 2006
-8
-6
-4
-2
0
2
60 80 100 120 140
Day of Year
Dai
ly F
NE
E(g
m-2
)
Herbaceous component
Low open site
Tojal grassland
Alentejo, Portugal 2006
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