chapter 53 - nutrient cycling
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12 Terms
what are the 4 major nutrient cycles?
water, nitrogen, phosphorus, and carbon
major reservoir for water?
oceans
major reservoirs for nitrogen?
atmosphere (N2)
what organisms perform nitrogen fixation?
diazotrophs (bacteria like rhizobia, frankia)
what human process also fixes nitrogen?
haber-bosch industrial fertilizer production
what is eutrophication?
excess N & P→ algal blooms→ oxygen depletion→ fish death
what causes hypoxia (dead zones)?
bacterial decomposition of algal blooms uses up dissolved oxygen
why is phosphorus cycle local?
no gaseous form of phosphorus
what are prairie strips?
perennial vegetation bands that reduce nitrogen (85%) and phosphorus (90%) runoff
major reservoirs in the carbon cycle?
oceans, soils, atmosphere (small but important)
what is the greenhouse effect?
CO2, CH4, and N2O trap heat radiated from earth
what is “peak phosphorus” ?
the point at which global phosphorus production reaches its maximum, after this, supply declines while demand continues, creating agricultural challenges
Note 
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