Human impacts (biogeochemical cycle)

Deforestation

lowers trainspiration

Paving/Building/Development

higher runoff and lower infiltration

Eutrophication

when a body of water becomes overly enriched with nutrients, causing excessive algae growth

Combustion

when wood or fossil fuels, which contain carbon, are burned, causing major rise of CO2 in the atmosphere

Fertilizers

The use of fertilizers adds WAY too much nitrogen to the soil, creating an imbalance. (This excess nitrogen can runoff and cause eutrophication.)

Combustion

not as major of an impact on this cycle as the carbon cycle, but burning fossil fuels does release excess nitrogen into the atmosphere.