N Cascade

Which is NOT a main reason for the global increase of reactive nitrogen?

• Industrial processes creating more N2

• Cultivation of rice and legumes

• Haber Bosch Process

• Higher amounts of Nox due to burning fossil fuels

What percentage of humans owe their life to fertilizers made from the Haber Bosch process according to the paper?

• 20%

• 30%

• 40%

• 50%

Which type of food contributes the most nitrogen to the human diet?

• Meat from concentrated animal feeding operations

• Fish

• Pasture raised animals

• Grain

In forest systems, which circumstances would lead to faster N saturation

• Deciduous forests near a non point source of Nr

• Evergreen forests near a point source of Nr

• Tropical forests near a non point source

• Evergreen forests near coastal areas

What are the effects of excess Nr in coastal ecosystems? (Please select all answers that are correct)

• Eutrophication/dead zones

• Decrease in fish production

• Decreased need for fisheries management due to natural nutrient cycling

• Decrease in marine biodiversity

Tags

NGSS.HS-LS2-6

NGSS.HS-LS2-7

What are the conditions needed for denitrification in aquatic systems? (select all correct answers)

• Presence of nitrate

• Presence of phosphorus

• Presence of labile organic matter

• Low or absent dissolved O2

• High concentrations of dissolved O2

Tags

NGSS.HS-LS2-3

In which system is reactive nitrogen (Nr) most likely to be stored long-term?

• Wetland

• Forest

• Rivers

• Atmosphere

How much of the inidigenous N supply is available to crops in a given year?

• 2%

• 5%

• 10%

• 15%