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8 Cards in this Set

  • Front
  • Back
biogeochemical cycles
elements, chemical commpounds, and other forms of matter are passed from one organism to another and form one part of the biosphere to another
the process by which water changes from liquid to an atmospheric gas
water evaporating from the leaves of plants
all the chemical substances that an organism needs to sustain life
nitrogen fixation
bacteria, which lives in the soil and on the roots of plants called legumes, convert nitrogen gas into ammonia
primary productivity
the rate at which organic matter is created by producers
limiting nutrient
ecosystem is limited by a single nutrient that is scarce or cycles very slowly
algal bloom
when an aquatic ecosystem recieves a large input of a limiting nutrient-for example, runoff from heavily fertilized fields-the result is often an immediate increase in the ammount of algae and other producers