Notes For First Test

Notes For First Test - Environmental Science Notes...

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Environmental Science Notes Continued (See Notebook for Rest) Check book for diagrams-especially page 74 Biogeochemical: o 3 Pools: Atmospheric, Nitrogen, and Phosphorus Cycles o Atmospheric-CO 2 which is primary greenhouse gas o Nitrogen Cycle: N 2 Form, most times has to be fixed and put into a form that can be utilized occurs thanks to Nitrogen Fixing Bacteria-fix the Nitrogen to allow it to be absorbed by the plant roots and then incorporated into molecules plant and animal bodies Nitrogen Fixing Bacteria: anaerobic bacteria Rhizobia Azotobacteria and Clostridium Critical for proteins, nucleic acids, energy providers (NAD) Denitrifying Bacteria: Break down material and release nitrogen back into environment in N 2 form Nitrous Oxides continually released into atmosphere and can’t be broken down acid rain o N 2 Nitrogen Fixation Nitrification Assimilation Ammonification Denitrification o Nitrogen is fixed on the land primarily through nitrogen fixing bacteria but is fixed in maritime environment by cyanobacteria (blue-green algae) o Phosphorus Cycle (see notebook) o Forms of phosphorus in ecosystem: Orthophosphate (Soluble PO 4 ) Organic Phosphate Digest with acid + heat PO 4 2 Condensed (polyphosphate) Digest with acid PO 4
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Absorbed Phosphate Primarily found absorbed to clay sediments Primary way that PO4 gets into lakes and streams Treat with weak acid PO 4 Average Total Phosphorus in lake ranges ~.1 .3 mg/L o More phosphorus you have the better the growth, can be critical limiting factor o A lot of the phosphate that we deal with comes from fertilizers farmers and regular everyday gardeners o Sulfur: organic material has sulfur attached to proteins, etc. It’s the grey-black ooze when you step in mud, causes the rotten egg smell o Materials that we don’t want recycled get recycled too Ex: DDT: doesn’t break down (long lasting—about 20 years) Not water soluble Biomagnification: animals eat plants, other animals eat those animals more and more at each trophic level Gets into phytoplankton and that gets eaten by birds, etc. endangering the Bald Eagle (weak eggshells b/c not enough calcium) Mercury Contamination: Precipitates proteins Mercury poisoning-best example came from Japan-industries released mercury runoff into bay and people who ate that fish got mercury poisoning, burning fossil fuels-comes down in rain, natural volcanic activity Vapor is the dangerous part Acted upon by bacteria and attached methyl and created a worse situation and created another biomagnification problem o Cycling of Radioactive Materials
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Notes For First Test - Environmental Science Notes...

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