BIOL-2356EL Lecture Notes - Lecture 14: Biogeochemistry, Enzyme, Activation Energy
4 Mar 2020
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Chapter 14 - biogeochemistry #2: n & p. Biochemistry 2 - all the n & p. Preference depends on the species and habitat. Plants take up nitrogen mostly in the form of ammonium and nitrate (nh4+ & no3-) With the help of mycorrhiza, some species are able to acquire organic n. In nutrient-poor environments, primary producers may get n directly from animals (carnivorous plants) Transforming atmospheric n2 to nh3 then to organic molecules (peptides) with -nh2. Other n-fixing organisms: of nitrogen which plants can use. Some plants (ex. legumes) form symbiosis with bacteria which are able to reduce atmospheric n2 to forms. Bean nodules (ex. soybean): symbiotic n-fixing bacteria can typically be found in root nodules. Alder and myrica form symbioses n2-fixing frankia (actinomycetes) Spirochetes in guts of wood-eating termites fix atmospheric n2. 1: ammonification, assimilation, assimilatory n reduction, nitrification. Despite the abundance of n, primary production is often n-limited n2 is not easily accessible!
