BIOL350 Lecture Notes - Lecture 11: Nitrogen Fixation, Anaerobic Respiration, Nitrification
6 Jan 2018
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N: what is features of nitrogen: limits primary production esp. temp. forest & salt water ecosystems, key nutrient, but too much in excess is bad, n is part of proteins + complex because of oxidative states. N: what is nitrogen cycle processes: nitrogen can only be taken up via conversion to : Tf: most was derived from n fixation (lightning/special microbes) What is fixation: abiotic (lightning): n2-> noy ( various forms of reactive n, biotic(cyanobacteria) n2->nh3 (ammonia) but requires light or it requires. Relationship bw 1-producers & microbes with required enzymes for e~ What is mineralization & immobilization: immobilization: nh4, mineralization (or, ammonification): organic n nh4. Mineralization=by product of microbial decomposition or orgo compounds and depends on microbial need for n. Decomposition of n-rich organic compounds leads to release of excess n in the environment. Balance between mineralization and immobilization regulates the size of soluble n pool (bioavailable) ( for uptake by primary produce)
