425 Review #2

Form of N that is most closely associated with leaching into groundwater

(a)  

More dissolved oxygen consumed is associated with

• Higher BOD

• Lower BOD

Pollutants that are naturally occurring or man-made elements or

compounds (e.g., nitrogen, pesticides, heavy metals,

pharmaceuticals)

• Physical

• Chemical

• Biological

• Radiological

Pollutants that impact physical appearance or other physical properties of water (e.g., sediment)

• Physical

• Chemical

• Biological

• Radiological

What are sources of pathogens in waterways?

• Land application of animal manure or sewage/sludge

• Wildlife and pet waste

• Tissues of diseased plants and animals

• Faculty septic tanks or sewer systems

What factors help explain why riverine N concentrations in the Mississippi River Basin are two times higher than the previous century?

• Degradation or destruction of wetlands, floodplains, and other ecosystems

• Urban and suburban development

• Haber-Bosch process and mechanization led to increased fertilizer use

• More intensive crop and animal production, especially N-fixing crops

The following wetland type has these characteristics:

1. 1. Water sourced primarily from precipitation

2. 2. Dominated by mosses and shrubs

3. 3. Acidic soils

4. 4. Pocosins are a sub-type

• Fens

• Bogs

• Swamps

• Marshes

Larger watersheds tend to have ___________ sediment delivery ratios.

• Lower

• Higher

What factors impact sediment yield?

• Channel Density

• Particle Size

• Sediment Source

• Hydrologic Connectivity

A coastal sandy soil with elevated hemic organic matter has...

• Low P sorption capacity

• High P sorption capacity