Stands: MHW, MRP, PB, CC/YHW, YMP Data coverage: May 1, 2002 - April 30, 2003
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Carbon fluxes in a managed Northern Wisconsin landscape (Chequamegon National Forest, Washburn Ranger District) Stands: MHW, MRP, PB, CC/YHW, YMP Data coverage: May 1, 2002 - April 30, 2003 Asko Noormets, Jiquan Chen
description
Carbon fluxes in a managed Northern Wisconsin landscape (Chequamegon National Forest, Washburn Ranger District). Stands: MHW, MRP, PB, CC/YHW, YMP Data coverage: May 1, 2002 - April 30, 2003 Asko Noormets, Jiquan Chen. Stand characteristics. Site 1: Mature hardwood. Site 2: Mature red pine. - PowerPoint PPT Presentation
Transcript of Stands: MHW, MRP, PB, CC/YHW, YMP Data coverage: May 1, 2002 - April 30, 2003
Carbon fluxes in a managed Northern Wisconsin landscape (Chequamegon National Forest, Washburn Ranger District)
Stands: MHW, MRP, PB, CC/YHW, YMP
Data coverage: May 1, 2002 - April 30, 2003
Asko Noormets, Jiquan Chen
Stand characteristics
Parameter MHW MRP PB CC YMP
% of landscape 40.1 20.5 17 5.3 4.6
Basal area m2 ha-1 33.5 26.9 n/a n/a 4.72
Tree Age, years 65 63 15 3 8
Canopy cover, % 97 70 4 2 17
Site 1: Mature hardwood
Site 2: Mature red pine
Site 3: Pine barrens
Site 4: Hardwood clearcut
Site 5: Young mixed pine
Monthly NEE
-1000
-800
-600
-400
-200
0
200
400
May
June
July
Aug
.
Sept
.
Oct
.
Nov
.
Dec
.
Jan.
Febr
.
Mar
ch
Apr
il
NEE
, g
C m
-2 m
o-1
MHW
MRP
PB
CC/YHW
YMP
Annual NEE
-1000
-800
-600
-400
-200
0
200
400
MHW MRP PB CC/YHW YMPN
EE,
g C
m-2
yr-1
Energy balance closure
storTGRn
HsEClosure
Site All Night DayMHW 0.588 0.717 0.62MRP 0.579 0.696 0.587PB 0.649 0.791 0.656CC/YHW 0.514 0.821 0.469YMP 0.588 0.721 0.582
Night NEE-Ta relationships
MHW: y = 0.1361 e0.0111x,
R2yr=0.1507, R2
s=0.0292
MRP: y = 0.1869 e0.0214x,
R2yr=0.1355, R2
s=0.0603
PB: y = 0.0784 e0.05x,
R2yr=0.0873, R2
s=0.0077
CC/YHW: y = 0.1703 e0.0298x,
R2yr=0.2301, R2
s=0.1088
YMP: y = 0.2265 e0.0156x,
R2yr=0.1130, R2
s=0.1063
0.0
0.1
0.2
0.3
0.4
0.5
0 10 20 30 40
MHW
MRP
PB
CC
YRP
Ta, °C
NE
E, m
g C
O2 m
-2 s
-1
Original data & corrections, MHW
-250
-200
-150
-100
-50
0
50
100
May
Jun
e
July
Au
g.
Sep
t.
Oct
.
Nov
.
Dec
.
Jan.
Febr
.
Mar
ch
Apr
il
NEE
, g
C m
-2 m
o-1
Fc+Stor.+WPL
E bal. cl.
u*-adj.
Stor.Winter.u*
Method 10
NEE
-300
-250
-200
-150
-100
-50
00 50 100
Stand age (could be LAI)
% c
han
ge
due
to s
tora
ge
& u
*
Site Fc+WPL+Storage closure corrected u* corrected method 10.1MHW -1427 -1312 -1215 -616MRP -1678 -1373 -1297 -912PB -653 -381 -517 -326YHW -136 -38 -43 188YRP -881 -573 -528 -261
Storage term calculationsFc
FcWPL
Li800
Li800WPL
IF ((MHW or MRP) AND Li800 ne .)THEN FcSTOR=FcWPL+Li800WPL
IF (PB or CC or YMP)THEN FcSTOR=FcWPL
7-day mean ofLi800WPL=lagli800
Li800WPL = f (Tref) CO2STOR
IF ((MHW or MRP) AND (before or after Li800));
IF (Li800WPL<-0.05 or Li800WPL= .) AND CO2STOR>0THEN FcSTOR=FcWPL+CO2STOR
IF Li800WPL<-0.05 AND CO2STOR<0THEN FcSTOR=FcWPL+lagli800
IF (MHW or CC or PB) AND month>10 THEN FcSTOR>0 ELSE .;IF (MRP or YMP) AND month>10 AND TAir<10 THEN FcSTOR>0 ELSE .;
A-Q response (July - August)
-10
-5
0
5
10
15
20
25
30
0 500 1000 1500 2000NEE
, µm
ol C
O2
m-2
s-1
MHW MRP PB CC/YHW YMP
Partial R2 for residual analysis
Fc_resid = f {VPD, Rn}
R2VPD (MHW)
=0.063, R2Rn (MHW)
=0.161
R2VPD (MRP)
=0.105, R2Rn (MRP)
=0.149
Fc_resid = f {Rn, VPD}
R2Rn (PB)
=0.055, R2Rn (PB)
=0.056
R2Rn (CC)
=0.203, R2Rn (CC)
=0.130
R2Rn (YMP)
=0.123, R2Rn (YMP)
=0.275
Remaining uncertainties
• Accuracy of net radiometers
• Independent criteria for quantifying storage
• Absence of direct storage data in winter
• Midday NEE negative in winter (w/o leaves)
A-Q response, Pmax
MHWMRP PB YHW YRP
May-June
July-Aug.
September
October
Nov.-Dec.
0
0.2
0.4
0.6
0.8
1
1.2P
ma
x
MHW MRP PB YHW YRP
May-June
July-Aug.September
OctoberNov.-Dec.
0
0.001
0.002
0.003
0.004
0.005
0.006
0.007
Qu
an
tum
yie
ld
A-Q response, Q
MHW MRP PB YHW YRP
May-June
July-Aug.September
OctoberNov.-Dec.
0204060
80100
120
140
160
180
200
Lig
ht
com
p. p
oin
t
A-Q response, L
