BIOL 335 Lecture Notes - Lecture 4: Nitrogen Fixation, Nitrogen Cycle, Hydrosphere
Document Summary
Nutrient: any element that on organism must take in to live, grow, and reproduce. Nitrogen is associated with green-blue algae due to nitrogen fixation. Can be found in a variety of locations: atmosphere: ~80% is nitrogen, lithosphere: geology, soil, and rocks, hydrosphere: water of planet. Autochthonous: from the inside: direct deposition onto lake surface, was considered minor, but now probably significant b. Industrial fumes: acidic rain; sulfuric and nitric acid are the two main acid rain types, allochthonous inputs from surface and groundwater, nitrogen input accelerated from human activity a. i. Agriculture, industrial plants: depends on bedrock, soil, vegetation, and microbial activities, nitrogen converted into fertilizers was one of the main starting points of human activity effecting nitrogen input, autochthonous n fixation, within lakes via nitrogen fixation a. i. Fixation only used if it is required a. ii. Energy used (atp for example) is very high for conversion a. iii.
