BESC 201 1st Edition Lecture 5 Outline of Last Lecture I Energy Fundamentals and Ecosystems Outline of Current Lecture II Biogeochemical Cycles Current Lecture Chapter 2 Lecture 5 Biogeochemical Cycles Nutrients circulate in biogeochemical cycles Residence time varying amounts of time that nutrients occupy a reservoir Source when a reservoir releases more materials than it accepts Sink when a reservoir accepts more materials than it releases Flux the rate at which materials more between reservoirs The carbon cycle circulates a vital organic nutrient Largest reservoir sedimentary rock second largest ocean waters Use of fossil fuels increases flux of carbon from lithosphere to atmosphere and shortens residence time of carbon in fossil fuel deposits The nitrogen cycle involves specialized bacteria Nitrogen fixation lightning energy striker or nitrogen fixing bacteria Nitrification converting ammonium ions first into nitrite ions NO 2 then nitrate ions NO3 Denitrifying bacteria convert nitrates in soil or water to gaseous N2 These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute We have greatly influenced the nitrogen cycle Nitrogen fixation was originally a bottleneck but now humans fix as much nitrogen artificially as it s done naturally The phosphorus cycle circulates a limited nutrient Sedimentary rocks are the largest reservoir Weathering to reduce phosphate ions PO43 into water is the only way
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