ARC LTER Long-term (~30 yr) N+P fertilization of moist acidic tundra Factorial N, P, greenhouse,...
3
ARC LTER Long-term (~30 yr) N+P fertilization of moist acidic tundra Factorial N, P, greenhouse, shade house experiment on 5 tundra types Herbivore exclosure, N+P fertilizer in moist acidic and heath tundra Species removal, N+P fertilizer in moist acidic tundra Multi-level factorial N,P fertilization of moist acidic tundra Stream P fertilization/ 15 N labeling Stream recovery from P fertilization Stream moss re-establishment with 2 nd fertilization Whole-lake NP fertilization Lake recovery from fertilization Inorganic Nutrient Research Toolik Lake ARCTIC- LTER ARC LTER Long-term (~30 yr) N+P fertilization of moist acidic tundra Factorial N, P, greenhouse, shade house experiment on 5 tundra types Herbivore exclosure, N+P fertilizer in moist acidic and heath tundra Species removal, N+P fertilizer in moist acidic tundra Multi-level factorial N,P fertilization of moist acidic tundra Stream P fertilization/ 15 N labeling Stream recovery from P fertilization Stream moss re-establishment with 2 nd fertilization Whole-lake NP fertilization Lake recovery from fertilization
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Transcript of ARC LTER Long-term (~30 yr) N+P fertilization of moist acidic tundra Factorial N, P, greenhouse,...
ARC LTER
Long-term (~30 yr) N+P fertilization of moist acidic tundraFactorial N, P, greenhouse, shade house experiment on 5 tundra typesHerbivore exclosure, N+P fertilizer in moist acidic and heath tundraSpecies removal, N+P fertilizer in moist acidic tundraMulti-level factorial N,P fertilization of moist acidic tundraStream P fertilization/ 15N labelingStream recovery from P fertilizationStream moss re-establishment with 2nd fertilizationWhole-lake NP fertilizationLake recovery from fertilization
Inorganic Nutrient ResearchToolik Lake ARCTIC- LTER
ARC LTER
Long-term (~30 yr) N+P fertilization of moist acidic tundraFactorial N, P, greenhouse, shade house experiment on 5 tundra typesHerbivore exclosure, N+P fertilizer in moist acidic and heath tundraSpecies removal, N+P fertilizer in moist acidic tundraMulti-level factorial N,P fertilization of moist acidic tundraStream P fertilization/ 15N labelingStream recovery from P fertilizationStream moss re-establishment with 2nd fertilizationWhole-lake NP fertilizationLake recovery from fertilization
ForbsEvergreenDeciduousGraminoids
Recent Key Findings - Inorganic NutrientsToolik Lake ARCTIC- LTER
ARC-LTER
ReferenceFertilized
1985 1995 2005
Epili
thic
Chl
-a (m
g cm
-2)
% M
oss
Cove
r
NotPresent??
2000 2005 2010Ch
l-a (m
g L-1
)Se
chi d
epth
(m)
Zoop
lank
ton
(mg
L-1)
Fish
(N)
0
0.2
0.4
0.6
0.8
1
1.2
0 0.5 1
deep, fish, fert
shallow, no fish, fert
deep, fish, ref
shallow, no fish, ref
0
6
12
0
6
12
0
600
300
600
300
900
Recovery from Thermokarst
0
5
10
15
20
0 1000 2000 3000 4000
Plan
t C (k
g C
m-2
)
Years
0
5
10
15
20
0 1000 2000 3000 4000
Plan
t C (k
g C
m-2
)
Years
Syntheses ideas - Inorganic NutrientsToolik Lake ARCTIC- LTER
ARC-LTER
Soil to plant redistribution of nutrients, reset plant-soil balance and synchrony among nutrient cycles
The entrainment of nutrients into the ecosystem cycle requires a continuous balance between plant and soil processes. Disturbance disrupts that balance and the synchrony of N & P cycles. 2nd succession first reestablishes the soil-plant balance by a redistribution of nutrients, then re-accumulates lost nutrients.
Re-accumulate lost nutrients
Plan
t bio
mas
s
Years of nutrient entrainment
Plant
Soil
Plant
Soil
Plant
Soil
Plant
Soil
Plan
t NSoil N
FireRecovery
