10-6 - Geography 1111 10-6-08 Ecosystem Structu re 1. 2. 3....

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Geography 1111 10-6-08 Ecosystem Structure 1. Basic definitions 2. Exchanges of energy and matter Photosynthesis Respiration Water movement through plants Net primary productivity (NPP) 3. Nitrogen Cycle 4. Food Webs Basic Terms Ecosystem- collection of living organisms and their physical environment Community + Habitat System—all parts are interrelated Photosynthesis Fundamental process for all living organisms All animals depend on plants to capture sunlight and convert it into food, or chemical energy. Photosynthesis- combines water and carbon dioxide in series of reactions to fix solar energy as carbohydrates (food). Endothermic reaction energy source is sunlight. Produces oxygen as a byproduct, which has accumulated in our atmosphere. Respiration Oxidation of carbohydrates to release metabolic energy Reverse chemical process to PSN
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Respiration—dissipates energy as heat Transpiration Evaporation of water form the stomata Water transport stops if:
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10-6 - Geography 1111 10-6-08 Ecosystem Structu re 1. 2. 3....

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