NREM 301Forest Ecology &

Soils

Quiz & N, P, C Nutrient Cycling

Day 26November 19,

2009

Happy Thanksgiving

Break!

Individual Portion of

Quiz

A

B

A – What stage of decay is this log at – provide 2 functions that if provides.

B – Why is this cavity there or how do you think it was it created – the arrow is pointing at material created by what wall that is isolating this wound from the rest of the tree?

1

The area indicated by the red circle is found in what phase of the shifting-mosaic steady state model of succession? Briefly explain your reasons.

2

3What stage of the stand development model is represented in this picture –briefly explain your reasoning.

Look carefully at the photo on the left – what soil mapping unit do you think this is – briefly explain why.

This bank is along the creek below which is the small creek we walked along on Wed at the Rest Area – it is not Bear Creek or the Skunk River

4

Please define the three sub cycles of the general nutrient cycle and identify the components that make up each of the three subcycles.

5a

b

c

de

fg

hi

j

k

l

Please Hand in the

Individual Portion of

Quiz

Group Quiz 1

Include only the applicable terms from the following words (phrases) on the diagram

1. Decomposition2. Nitrification3. Nitrobactor4. Assimilation5. Ammonification6. Leaching/Drainage Loss7. Free living bacteria 8. Denitrification9. Nitrogen Fixation10. Anaerobic11. Fertilization12. Rhizobium13. Atmospheric deposition

14. Nitrate15. Nitrosomanos16. Ammonia/Ammonium17. Nitrite18. Organic matter N19. N2 gas20. Mineralization21. Tiles22. Surface runoff23. Symbiotic N fixers24. Translocation

Diagram the nitrogen cycle for this specific location – the “open” area of the Rest Area

Identify 5 major differencesin the N cycle between the cropped landscape and the rest area landscape

2

Select either the carbon or phosphorus cycle and diagram it for the forest area below.

3

Please Hand in the Group

Portion of Quiz

Nitrogen CycleIn open area

NitrosomonasBacteria

NitrobacterBacteria

Mineralization

Uptake

Anaerobic

Free Living Bacteria - AzotobactorSymbiotic N-fixersRhizobium – Woody LegumesFrankia – Woody Non-legume

AmmoniumAmmonia (NH3)Ammonium (NH4)

Lightening

The P cycle

Weathering Addition

60%

Organic PDecomposition

SoilSolution P

Minor Leaching

P SorbedTo Soil

Plant Uptake

Fertilizer & ManureAddition

P SorbedTo Soil

Erosion

Very Little Atmosphere

Addition

No Gaseous Loss

Loss from animal & plant harvest

Mineralization

No Weathering Addition

All AtmosphereInput

Excreation

MovementOf Sugar

Stored as Starch

Organic C Storage &Decomposition

SoilCarbonHumus

Carbon SequestrationVery Minor Leaching

ManureAddition

Erosion

PS

RS

RS

Tree/PlantsMajor C StorageSequestration

Loss from animal & human eating – harvest of plants (lumber, corn, ethanol etc.)

Eating

RS

DyingC

StorageLitter

CO2 Carbon CycleO2 & CO2

No Plant Uptake

Carbon Cycle

What are the major:

• Inputs?

• Sinks?

• Outputs?

Pg. 505 text

Atmosphere