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C, N, cycles - Carbon and Nitrogen Cycles Chapter 32 1 2 3...

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Carbon and Nitrogen Cycles Chapter 32 1. Describe how increasing levels of atmospheric CO2 could increase C- sequestration. 2. List three factors that might limit the ability of plants to sequester C with global warming. 3. Describe the effects of eutrophication. 4. List three forest management practices that would be necessary to increase C- sequestration by trees. 5. Track the path of the formation of a dead zone from initial fertilizer excess in the water to fish kills and explain the role of photosynthesis and respiration in the process.
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Carbon Cycle Atmosphere [730],increasing 3.2 + 0.2/yr 120/yr Land-use: 2.2 ± 0.8/year Fossil fuels: 6.3 ± 048/year Land: Plants [500] Soil [1500] Sink 0.7 + 0.8/yr Ocean: [38,000] Sink 2.4 + 0.7/yr Residual Sink 2.9 + 1.1/yr 90/yr
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Where is the largest sink of C on earth? A. oceans B. plants C. soil D. atmosphere Clicker Question 1
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Greenhouse Effect
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Group Assignment Think about Pre-Class Assessment Question #2 Create a simple forest ecosystem model in which you label trees, decomposing organisms in the soil, insects that eat trees. Then create arrows to show CO2 moving in and out between these organisms, and label each arrow with the terms Respiration or Photosynthesis .
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Group Assignment Label the arrows in this diagram with (P)photosynthesis, (G)glucose transfer within the plant, or (R)respiration Compost Bacteria convert to humus CO2 CHO CHO CHO CO2 decomposition detritus Leaves Woody Tissue Fine Roots Leaf litter and soil Leaf fall Branch & stem fall Fine root mortality
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Group Assignment Develop three suggestions to increase the C- sequestration in your yard: 1.
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