4.Biogeochemical.cycling.11

4.Biogeochemical.cycling.11 - Special Topic: Biogeochemical...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Special Topic: Biogeochemical Cycling Introduction Nitrogen Cycle Sulfur Cycle Mercury Cycle Arsenic Cycle Summary and Conclusions I. What is Biogeochemical Cycling? Natural recycling of elements in via biological, geological and chemical processes. Involves transport and transformation of substances in the environment. Many cycles are interconnected: carbon, sulfur, nitrogen, etc. Cycles facilitate prediction of the fate of some chemicals they essentially jump on the environmental merry-go-round. II. Nitrogen Cycle All life requires N-compounds (e.g. amino acids, proteins, enzymes and nucleic acids). Air (78% N 2 ), is the major reservoir for N in the environment. N 2 is not available for use by most organisms plants must secure N in "fixed" form: NO 3 , NH 4 + and urea (NH 3 ) 2 CO. Animals secure N (amino acids, proteins) from plants (or other animals). Four Main Processes Fixation microbial removal of atmospheric N 2 and conversion to ammonium (NH 4 + ) or amino acids. Ammonification (microbial decay) reduction of amino acids to ammonium (NH 4 + )....
View Full Document

This note was uploaded on 03/10/2011 for the course ETX 102A taught by Professor Ronaldtjeerdema during the Winter '10 term at UC Davis.

Page1 / 18

4.Biogeochemical.cycling.11 - Special Topic: Biogeochemical...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online