Flows of Energy and Matter 2.3 Flashcards
1
Q
Nitrogen fixation
A
When atmospheric nitrogen is made available to plants through the fixation of atmospheric nitrogen.
2
Q
Gross productivity
A
Total gain in energy or biomass per unit area per unit time.
3
Q
Net productivity
A
The gain in energy or biomass per unit area per unit time that remains after deductions due to respiration.
4
Q
Nitrification
A
Some bacteria in the soil can convert ammonium to nitrites, some convert nitrites to nitrates, which are then absorbed by plants.
5
Q
Denitrification
A
Bacteria convert ammonium, nitrates and nitrites into nitrogen gas.
6
Q
Nutrient cycles
A
The availability and transfer of a wide variety of chemical elements in the environment are key factors that affect life on earth.
