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2.6 Cycling of Matter in Ecosystems

2.6 Cycling of Matter in Ecosystems. SNC 1D1 ECOLOGY UNIT. Biogeochemical Cycles. Matter cannot be created or destroyed , so all water and nutrients must be obtained from chemicals already in the environment

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2.6 Cycling of Matter in Ecosystems

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  1. 2.6 Cycling of Matter in Ecosystems SNC 1D1 ECOLOGY UNIT

  2. Biogeochemical Cycles • Matter cannot be created or destroyed, so all water and nutrients must be obtained from chemicals already in the environment • Chemicals on Earth are constantly consumed, rearranged, stored and used in a series of cycles called biogeochemical cycles

  3. The Carbon Cycle • Carbon moves between abioticand biotic parts of an ecosystem in carbon cycle • Most of this exchange occurs between carbon dioxide in air or water and photosynthesizing organisms • Most of Earth’s carbon is stored in carbon-rich deposits such as fossil fuels. Large quantities are also in planttissue and dissolved in the oceans

  4. The Carbon Cycle cont’d • By burning fossil fuels, humans release stored carbon into the atmosphere. • Deforestation also increases concentration of CO2 in atmosphere • The concentration of CO2 in atmosphere is higher now than it has been for last 800 000 years. This is causing global climatic change.

  5. Carbon Cycle Diagram

  6. Carbon Cycle Diagram

  7. Carbon Cycle video • http://www.youtube.com/watch?v=HrIr3xDhQ0E

  8. The Nitrogen Cycle • Nitrogen is very abundant in the atmosphere. It enters and leaves the atmosphere through the nitrogen cycle • Nitrogen is taken from the atmosphere by certain bacteria during nitrogen fixation • Nitrogen is returned to atmosphere by denitrifying bacteria

  9. Nitrogen Cycle Diagram

  10. Nitrogen Cycle Diagram

  11. Nitrogen cycle video • http://www.youtube.com/watch?v=ZaFVfHftzpI

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