Mpbep 2012 04 prsnttn chgsinchemistrypinelitterandsoilsacrossmpbattackstages
13
Forest mortality Litter Soils
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Transcript of Mpbep 2012 04 prsnttn chgsinchemistrypinelitterandsoilsacrossmpbattackstages
Forest mortality
Litter
Soils
Green Red Grey MPB ATTACK STAGE
LITTER DEPOSITION
SOIL CONDITIONS
0 yr 3-4 yr
Wulder et al. 2006
Research Questions
1. Does pine litter chemistry and deposition rate
differ by stage of mountain pine beetle attack?
2. Do the soil chemical properties differ by stage
of mountain pine beetle attack?
Litter Trap (22 – 50 cm)
Forest Measurement Plot
Soil Nutrient Probes
Experimental Design
Data Collection
Does litter deposition rate differ by attack stage?
Control Green-attack Red-attack
ATTACK CLASS
Pin
e
litt
er
ma
ss
(
kg
/ha
)
0
50
0
10
00
1
50
0
20
00
a
b
b
0 10 20 30 40 50 60
1000
1200
1400
1600
1800
2000
2200
MPB attacked basal area (m2/ha)
Pin
e l
itte
r m
as
s (
kg
/ha
)
R 2 =0.70
p<0.001 y = 1145 + 20.9 * x
0 10 20 30 40 50 60
1000
1200
1400
1600
1800
2000
2200
MPB attacked basal area (m2/ha)
Pin
e l
itte
r m
as
s (
kg
/ha
)
R 2 =0.70
p<0.001 y = 1145 + 20.9 * x
Litter Deposition
ab a
b
Does litter chemistry differ by attack stage?
a a
b
Control Green-attack Red-attack
Phosphorus Input
ATTACK CLASS
Ph
os
ph
oru
s i
np
ut
(Kg
/ha
)
0.0
0
.5
1.0
1
.5
2.0
a
a
b
Control Green-attack Red-attack
Pine Litter Phosphorus
ATTACK CLASS
Ph
osp
ho
rus
(%
dry
wt)
0.0
0
0.0
2
0.0
4
0.0
6
0.0
8
0.1
0
a a
b
Does nutrient input differ by attack stage?
Control Green-attack Red-attack
Litter N Input
ATTACK CLASS
Lit
ter
nit
rog
en
in
pu
t (
Kg
/ha
)
0
5
10
1
5
20
2
5
b
a
a
Does nutrient input differ by attack stage?
Control Green-attack Red-attack
Soil Nitrate Concentration
ATTACK CLASS
NO
3- s
up
ply
ra
te (µ
g/1
0 c
m2
/67
d)
0
1
2
3
4
5
Do the soil chemical properties differ by attack stage?
Control Green-attack Red-attack
Soil Phosphate Concentration
ATTACK CLASS
P s
up
ply
ra
te (µ
g/1
0 c
m2
/67
d)
0
5
10
1
5
20
2
5 b
ab
a
a
ab
b
Control Red-attack
Soil pH
ATTACK STAGE
pH
5.5
5
.6
5.7
5
.8
5.9
6
.0
6.1
Green-attack
a a b
b
Control Red-attack
Soil Moisture
ATTACK STAGE
Mo
istu
re (
%V
ol)
0
10
2
0
30
4
0
Green-attack
a
ab
b
Do the soil chemical properties differ by attack stage?
Green Red Grey MPB ATTACK STAGE
PINE LITTER
SOIL CONDITIONS
0 yr 3-4 yr
Quality
Nitrate
pH
Moisture
Deposition
Phosphate
Forest mortality
Litter
Soils
GREENHOUSE STUDY (Nov. ’11 – Aug. ’12)
Lodgepole pine (Light) x (Litter) x (Mycorrhizae)
White spuce (Light) x (Litter) x (Mycorrhizae)
