Chapter36 - Biogeochemical Cycling Chapter 36 Ecosystems...

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1 Chapter 36 Ecosystems and Biomes Biogeochemical Cycling Carbon Nitrogen Water All cycle between living things and non-living world Carbon Cycle Plants fix carbon dioxide from atmosphere into sugars Animals eat plants Return to atmosphere: Cellular respiration (animals & plants) Dead plants and animals are decomposed (includes burning fuel) Nitrogen Abundant in the atmosphere 78% Nitrogen (N 2 ) 21% Oxygen (O 2 1% Other Required by living things Amino acids, nucleotides Nitrogen Cycle N 2 not usable by most organisms Bacteria “fix” atmospheric N 2 into ammonia Nitrogen rich soil is created
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2 Fertilizers Nitrogen is limiting for crop growth Much fertilizer is nitrogen, fixed by chemistry in factories “Green revolution” that feeds current human population Trophic Levels Producers Make their own food (photosynthesis; autotrophs) Consumers Organisms that eat plants or animals (heterotrophs) Types of Consumers Herbivores Eat only plants Carnivores Eat only animals Omnivores Eat plants and animals Detritivores Eat waste and dead organisms
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Chapter36 - Biogeochemical Cycling Chapter 36 Ecosystems...

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