Four Biogeochemical Cycles

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by RandyAgudelo
Last updated 5 years ago

Earth Sciences

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Four Biogeochemical Cycles

Four Biogeochemical CyclesBy Randy Agudelo

The Water Cycle

"Water is essential to all organisms. Its availability influences the rates of ecosystem processes. Oceans contain 97% of the water in the biosphere. The main processes driving the water cycle are evaporation of liquid water by solar energy, condensation of water vapor into clouds, and precipitation" (pg. 1232).

The Carbon Cycle

"Carbon forms the framework of the organic molecules essential to all organisms. Photosynthetic organisms use carbon dioxide during photosynthesis and convert the carbon to organic forms that are used by consmers. Photosynthesis by plants and phytoplankton removes substantial amounts of atmospheric carbon dioxide each year" (pg.1232).

"Nitrogen is part of amino acids, proteins, and nucleic acids and is often a limiting plant nutrient. The main reservoir of nitrogen is the atmosphere, which is 80% nitrogen gas. The major pathway for nitrogen to enter an ecosystem is by nitrogen fixation, the conversion of nitrogen gas by bacteria to forms that can be used to synthesize nitrogenous organic compounds" (pg. 1233).

The Terrestrial Nitrogen Cycle

The Phosphorus Cycle

"Organisms require phosphorus as a major constituent of nucleic acids, phospholipids, and ATP and other energy-storing molecules. The most biologically important inorganic form of phosphorus is phosphate, which plants use in the synthesis of organic compounds. The largest accumulations of phosphorus are in sedimentary rocks of marine origin" (pg. 1233).


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