Biogeochemical Cycles/ Nutrient Cycles
• Biogeochemical Cycles • Nitrogen Fixation Write and define these 3 terms in your notes • Denitrification Carbon Cycle Water Cycle Nitrogen Cycle Phosphorus Cycle Draw and label the processes in these 4 cycles on blank paper. I will check, and then you keep in your notes.
Earth Photo Matter is recycled within and between ecosystems.
Biogeochemical cycles Ø Why is it important to know and understand a little about these cycles? l Humans can have an impact on the ability of these cycles to remain self sustaining. If something goes out of balance, the cycle may shift and life may change
Biogeochemical cycles Ø Biogeochemical Cycles, or Nutrient cycles, is how elements, chemical compounds, and other forms of matter are passed from one organism to another and from one part of the biosphere to another. Ø Water Cycle, Nitrogen Cycle etc……
Identify each step in the Water Cycle A. Transpiration B. Evaporation C. Condensation D. Precipitation E. Runoff F. Seepage G. Root uptake
The Water Cycle All living things require water to survive.
The Carbon Cycle Carbon is a key ingredient of living tissue.
Ø Carbon dioxide is released into the atmosphere by l volcanic activity l Respiration (cellular) l human activities l the decomposition of organic matter
Plants take in carbon dioxide and use the carbon to build carbohydrates during photosynthesis. Ø The carbohydrates are passed along food webs to animals and other consumers. Ø In the ocean, carbon is also found, along with calcium and oxygen, in calcium carbonate, which is formed by many marine organisms. Ø
The Phosphorous Cycle Phosphorus is necessary for nucleic acids (DNA), fats, cell membranes, bones, teeth and shells More phosphorus please!
The Nitrogen Cycle Organisms need nitrogen to build proteins.
Nitrogen Fixation Ø How do we get the Nitrogen we need? Nitrogen must be converted into compounds that can enter food webs by the process of “Nitrogen Fixation” Ø Plants will use to the ammonia to make nitrogen-containing organic molecules Ø Animals get nitrogen by eating plants or plant-eating animals
Denitrification Ø How is Nitrogen returned to the soil? . Ø Denitrification: When organisms die, decomposers return nitrogen to the soil. Some bacteria change nitrogen compounds back into nitrogen gas.