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ENV200H1 (60)
Karen Ing (49)
Lecture 6

env 200 lecture 6 jan 29.docx

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Department
School of Environment
Course
ENV200H1
Professor
Karen Ing
Semester
Winter

Description
Env200 lecture 6 jan 29  Could a carbon atom of 1000’s years ago be the same carbon atom u have today in your body; yes ****  Biogeochemical cycles o Involves biological, geological and chemical interactions o Matter cycles through ecosystems o One ecosystem to another; one organism to another  Nitrogen cycle o Proteins DNA o Atmosphere is 78% n2 o Five steps  Nitrogen fixation  Nitrification  Assimilation  Ammonification  Denitrification o Influenced by human activities o 78% of nitrogen is in the atmosphere o Its one chemical that has been influenced by human activities  Back in the 20 century of industrial process there was a process to convert atmospheric nitrogen into the more biological usable form  As result we have unlimited supply of ammonia for crop production ex: artificial fertilizers o Projected that nitrogen deposition on earth’s surface will double within next 25 yrs  Eutrophication, water quality, smog, acid rain, greenhouse gases  Nitrogen fixation o Specialized bacteria o Split atmospheric nitrogen and combine it with hydrogen  Phosphorous cycle o No atmospheric component o Phosphates r used in DNA and ATP (chemical energy) o strong compound in helping increase plant growth (like nitrogen) o phosphates move through the food chain  landorganismorganismland o phosphate can be lost from biological cycles, some are carried form the land by streams or rivers where it can be deposited on the seafloor and remain there for millions of years o no atmospheric presence; its in the oceans o not distributed evenly it has a patchy distribution o when trapped in lithosphere may stay there for extended period ex: ocean for millions of years o traditionally a limiting factor that can prevent growth, distribution or abundance o overabundance can have many interconnected impacts  the atmosphere o gaseous envelop surrounding earth o mostly oxygen and nitrogen (99%) o nitrogen 78% o oxygen 21% o argon 0.93% o Co2 0.04% o Other gases 0.03  4 layers of the atmosphere o Troposphere o
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