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Abiotic- NutrientCycles Abiotic – Non-living components essential to all environments. – Water cycle – carbon cycle – nitrogen cycle – phosphorous Nitrogen Cycle Nitrogen Fixation Nitrogen Fixation organisms convert gas into useable form. The Reaction N2 + 3 H2 2 NH3 NH3 is ammonia Ammonification – bacteria and fungi producing ammonia. Nitrogen gas in atmosphere Ammonia Nitrites and Nitrates Denitrification – puts Nitrogen back into the air Plants need Nitrogen for: 1. Protein 2. Chlorophyll What percent of the atmosphere is Nitrogen gas? 78% Plants can NOT use N2 from the air PHOSPHOROUS CYCLE (not in the air) Limiting Nutrient – a substance required by organisms and without them they will not grow and develop. Import for making DNA and ATP Sources of phosphates Cow manure Yard / crop fertilizers Soaps and detergents Sewage treatment plants Carbon Cycle CO2 in Atmosphere CO2 in Ocean Increasing atmospheric CO2 levels as measured in the atmosphere and ice cores. The amount of net carbon increase in the atmosphere, compared to carbon emissions from burning fossil fuel. That’s it, any questions? Homework: Read the excerpt from “ A Sand County Almanac” and diagram two cycles of “X.” Use RED arrows to indicate the flow of X and BLUE arrows to indicate the flow of energy.