Soil enzyme activity indicates microbial P limitations

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Soil Enzyme Activity Indicates
Microbial P Limitation
Shan Shan
Miami University
Advisor: Melany Fisk

Resource Limitation and Allocation
Responses
• Economic-based analogies for resource
acquisition
• “Efforts” are preferabl...

Extracellular Enzymes
• Mediate nutrient acquisition from organic matter
• Indicators of soil organisms nutrient demand
• ...

Questions
• What limits decomposer microbes, based on enzyme
activities?

Methods
Oe Oa B

Methods
• N enzymes
– Alanine
aminopeptidase
– β-N-
acetylglucosami
nidase (NAG)
• P enzyme
– Acid
phosphatase
• C enzyme
...

0
0.2
0.4
0.6
0 0.2 0.4 0.6
C/C+N
C / C+P
relative P vs. N limitation
EnzymeActivity
Enzyme Activity

• N increased vector length (C limitation).
• P decreased vector angle (P limitation).
0
0.2
0.4
0.6
0.8
0 0.2 0.4 0.6 0.8...

• P decreased vector angle.
0
0.2
0.4
0.6
0.8
0 0.2 0.4 0.6 0.8
C/C+N
C / C + P
B

• Incorporation of 18O
into DNA of
growing organisms
used to measure
growth
• P limits growth in
the 2 stands tested
• Sup...

Conclusions
• P limitation is suggested by enzyme activities
in stands of all ages.
• Elevated N availability increases C ...

Questions?

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