suny-esf kikang bae (kbae02@syr)
DESCRIPTION
Still waiting for fertilization effects on soil respiration and root respiration. SUNY-ESF Kikang Bae ([email protected]). Introduction. Soil respiration is a major flux of carbon to the atmosphere. Nutrient additions to forest soils can affect soil respiration. The global carbon cycle. - PowerPoint PPT PresentationTRANSCRIPT
SUNY-ESFKikang Bae
Still waiting for fertilization effects on soil respiration and root respiration
Introduction
• Soil respiration is a major flux of carbon to the atmosphere.
• Nutrient additions to forest soils can af-fect soil respiration.
The global carbon cyclehttp://sitemaker.umich.edu/section2group4/the_link__human_influences_on_storm_intensity
Introduction
Ways nutrient addi-tion affects soil respi-ration:
Altering root activity Altering microbial activ-
ity Change above- and be-
low- ground carbon production
Soil respiration will in-crease or decrease af-ter nutrient addition?
soil respira-tion
aboveground respiration
photosynthesis
root + microbial respiration
CO2
CO2
CO2
CO2
Objectives
• To determine effects of nutrient additions on soil respiration and root respiration be-tween forest ages
• To understand which component (root or microbial) causes changing soil respira-tion, if there is a change at all
• To know which nutrients (N, P, N+P) have the greatest effect on soil respiration in our stands.
Hypothesis
Adding nutrients (N, P, N+P)
Soil respiration(root/microbial respiration)
An
nu
al soil r
esp
irati
on
(g
C/m
2)
Mid Old0
100
200
300
400
500
600
700
800
900
1000 Series1Series3Series5
Bartlett Hubbard BrookJeffers Brook
Age: P = 0.11Site: P = 0.02
Hypothesis
Adding nutrients (N, P, N+P)
Soil respiration(root/microbial respiration)
Soil respira-tion before fertilization(09’-11’)
Hypothesis
Adding nutrients (N, P, N+P)
Soil respiration(root/microbial respiration)
Soil respiration more Young: N+P > N > P >
ControlOld: N+P > P > N > Control
Middle (30~40 yrs)
Old (77~127 yrs)
Study sites
• Bartlett Experimental Forest (BEF)• Hubbard Brook (HB, WS 101)• Jeffers Brook (JB)
Young (20~22 yrs)Bartlett• C1• C2• C3
Bartlett• C4• C5• C6Jeffers Brook• MidHubbard Brook• Mid
Bartlett• C7• C8• C9Jeffers Brook• OldHubbard Brook• Old
Inten-sivetrench-ing
Methods
• Soil respiration: Chamber (Licor 8100).• Root respiration (Soil respiration – without live root respiration): Trenching
Results (Fertilization on soil respira-tion)
6/1/
2009
10/1
/200
9
2/1/
2010
6/1/
2010
10/1
/201
0
2/1/
2011
6/1/
2011
10/1
/201
1
2/1/
2012
6/1/
2012
0
2
4
6
8
BEF mid (C6)
So
il r
esp
ira
tio
n (
um
ol/
m2
/se
c)
6/1/
2009
8/1/
2009
10/1
/200
9
12/1
/200
9
2/1/
2010
4/1/
2010
6/1/
2010
8/1/
2010
10/1
/201
0
12/1
/201
0
2/1/
2011
4/1/
2011
6/1/
2011
8/1/
2011
10/1
/201
1
12/1
/201
1
2/1/
2012
4/1/
2012
6/1/
2012
0
2
4
6
8
10
12
BEF old (C9)
N+PNPC
Fertilization start
Fertilization start
P < 0.001
0
2
4
6
8
HB midS
oil
re
sp
ira
tio
n (
um
ol/
m2
/se
c)
6/1/
2009
10/1
/200
9
2/1/
2010
6/1/
2010
10/1
/201
0
2/1/
2011
6/1/
2011
10/1
/201
1
2/1/
2012
6/1/
2012
0
2
4
6 JB mid
So
il r
esp
ira
tio
n (
um
ol/
m2
/se
c)
6/1/
2009
8/1/
2009
10/1
/200
9
12/1
/200
9
2/1/
2010
4/1/
2010
6/1/
2010
8/1/
2010
10/1
/201
0
12/1
/201
0
2/1/
2011
4/1/
2011
6/1/
2011
8/1/
2011
10/1
/201
1
12/1
/201
1
2/1/
2012
4/1/
2012
6/1/
2012
0
2
4
6
8 JB old
0
2
4
6
8
HB old N+PNPC
Fertilization start
Fertilization start
Fertilization start
Fertilization start
P = 0.006
0
2
4
6
8
10
BEF young (C1)S
oil
re
sp
ira
tio
n
(um
ol/
m2
/se
c)
0
2
4
6
8
BEF young (C2)
N+PNPC
5/1/
2010
7/1/
2010
9/1/
2010
11/1
/201
0
1/1/
2011
3/1/
2011
5/1/
2011
7/1/
2011
9/1/
2011
11/1
/201
1
1/1/
2012
3/1/
2012
5/1/
2012
7/1/
2012
0
2
4
6
8
10 BEF mid (C4)
So
il r
esp
ira
tio
n (
um
ol/
m2
/se
c)
6/1/
2010
8/1/
2010
10/1
/201
0
12/1
/201
0
2/1/
2011
4/1/
2011
6/1/
2011
8/1/
2011
10/1
/201
1
12/1
/201
1
2/1/
2012
4/1/
2012
6/1/
2012
0
2
4
6
8
10
12
14 BEF old (C7)
Fertilization start
Fertilization start
Fertilization start
Fertilization start
BEF young (C2)
BEF mid (C6) BEF old (C7) JB mid JB old0
10
20
30
40
50
60
70
80
90
100
3733
49
44
53
46
39
47
41
4844
55
3740
4344 44
49
5458
N+P N P CR
oo
t co
ntr
ibu
tio
n (
%)
Results (Root contribution on soil respira-tion)
Soil respira-tion – without live root respi-ration
Results (Fertilization on trenching)
Jun 10'
Aug 10'
May 11'
Jun 11'
early Jul 11'
late Jul 11'
Aug 11'
Sep 11'
May 12'
Jun 12'
0
2
4
6
8
JB mid
So
il r
esp
ira
tio
n (
um
ol/
m2
/se
c)
Jun 10'
Aug 10'
May 11'
Jun 11'
early Jul 11'
late Jul 11'
Aug 11'
Sep 11'
May 12'
Jun 12'
0
2
4
6
8
JB old
N+PN PC
Fertilization start
Fertilization start
Jun
10'
Aug 1
0'
May 1
1'
Jun
11'
early
Jul 1
1'
late
Jul 1
1'
Aug 1
1'
Sep
11'
Oct 1
1'
May 1
2'
Jun
12'
0
2
4
6
8
BEF young (C2)S
oil
re
sp
ira
tio
n (
um
ol/
m2
/se
c)
Jun 10'
Aug 10'
May 11'
Jun 11'
early Jul 11'
late Jul 11'
Aug 11'
Sep 11'
Oct 11'
May 12'
Jun 12'
0
2
4
6
8
BEF mid (C6)
N+PN PC
Jun
10'
Aug 1
0'
May 1
1'
Jun
11'
early
Jul 1
1'
late
Jul 1
1'
Aug 1
1'
Sep
11'
Oct 1
1'
May 1
2'
Jun
12'
0
2
4
6
8 BEF old (C7)
So
il r
esp
ira
tio
n (
um
ol/
m2
/se
c)
Fertilization start
Fertilization start
Fertilization start
Summary
Adding nutrients (N, P, N+P)
Soil respiration No change (except C9 and HB mid)
Root respiration No change
Soil respiration No change Regardless of nutrients (N, P, N+P) and forest age
Conclusion
• There was little evidence of fertiliza-tion effects on soil respiration after 2 years nutrient addition.
Future plans
http://wric.ucdavis.edu/yst/images/none/nc5.JPG
May June
• Keep measuring soil respiration. • How do N, P, and N+P additions affect
root growth?
Acknowledge
Tim FaheyRuth Yanai
Melany Fisk
Acknowledge
Thank [email protected]