| Experimental | Methods | Results |
|---|---|---|
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CH4, CO2, N2O
What were the three GHGs mentioned in the Phillips et al experiment?
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Maize
What crop was used in the Phillips et al experiment?
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Soil treatment
What were EOC concentrations in the soil affected by (Henderson et al)?
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True
True or false. According to the Henderson et al paper, red clover and soybeans are both legumes.
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May 15th 2008. Seeding was done all on the same day.
When was seeding done for both treatments in the Phillips et al paper?
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+=Source
-=Sink GHG fluxes were greater in the late spring, meaning more GHGs were released into the atmosphere.
Explain positive and negative GHG fluxes in terms of sources and sinks. How did the GHG fluxes compare between early spring and late spring treatment (Phillips et al)?
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Reduce nitrate and nitrous oxide.
What do the Nir and NOs enzymes do and to which molecules (Henderson et al)?
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Red clover, soybeans and barley.
Name three plant residues used in the Henderson et al experiment.
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CH4, CO2 had greater fluxes. The N2O fluxes were not different between treatment groups.
In the Phillips et al paper, which GHG fluxes were greater in the late spring fertilizer group than the early spring fertilizer group? Which flux was not significantly different between the treatment groups?
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False
True of false. According to the Phillips et al paper, there is an abundance of data on how agricultural management influences sources and sinks of CH4, CO2 and N2O crop yields.
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Soil bulk density, total soil N, total soil C, water holding capacity, pH, salinity, electrical conductance, sand, and clay.
What were the nine soil properties measured before fertilization in the Phillips et al paper?
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Flux is an absolute rate measurement. A great flux can either be negative of positive.
What does Phillips et al mean when they say CO2 and CH4 had significantly greater fluxes if CO2 has a positive flux and CH4 has a negative flux?
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Does fertilizer application effect GHG fluxes and crop yields.
State the underlying question of the Phillips et al paper.
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All gaseous emissions from denitrification occurred as N2O.
Total denitrification was found to be almost equal to N2O emissions. What did Henderson et al conclude from this information?
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There are more mRNA transcipts than copies of the genes, meaning that NosZ is up-regulated in complex C amended soils.
The ratio of NosZ abundance mRNA levels for soil amended with residues ranged from .51+/- .37 to .56+/- .38. What does this information tell you about up-regulation (Henderson et al)?
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