BIOL 117 Lecture 22: Chapter 22 - Matter Cycling
23 Jul 2016
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Matter and energy cannot be created or destroyed. Carbon cycle: co2 ~ photosynthesis, respiration, death/decay. Carbon: three reservoirs: oceans (largest, terrestrial ecosystems. Coal/oil (fossil fuels: atmosphere: most rapid exchange of carbon into/out of atmosphere. Experiment was trying to answer the question of conservation of matter. The soil dried out but still stayed 200lbs minus 2oz. Some of that may have been from nutrients sucked up by plants. Mass of tree came from water/nutrients absorbed and co2 in atmosphere and carbohydrates produced through photosynthesis (not spontaneously created, and plants can"t take carbs out of soil), lots of carbon, causing it to grow. Due to fossil fuel combustion and impact of deforestation. Nitrogen cycle: nitrogen xation (not bad, plants much healthier, fertilizers, n- xation crops, fossil fuels, eutrophication: adding of nutrients to a water syste, then water has problem bec algae growth increases and des creases oxygen content. True or false: once carbon enters a plant, it can
