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Biogeochemical Cycles Carbon Nitrogen Phosphorus Water Basic Information • Biogeochemical cycles are governed by the Law of Conservation of Matter • They may be Atmospheric, Hydrologic, or Sedimentary • Atmospheric include the carbon, water, sulfur and nitrogen cycles • Hydrologic is the water cycle • Sedimentary include phosphorus and sulfur cycles . Carbon Cycle Water Cycle Remember Aquifers??? http://www.kingcounty.gov/environment/waterandland/groundwater/education/animation.aspx?_sm_au_=iV VV6qMRnskPs2Gr Phosphorus Cycle Sulfur Cycle 8 of 7 © Boardworks Ltd 2009 Nitrogen Cycle The stages of the nitrogen cycle What happens at each stage? Processes of the Nitrogen Cycle Chemicals involved in the nitrogen cycle Use of fertilizers Farming results in the level of nitrates in the soil being slowly depleted. Fertilizers are used to increase the soil nitrate levels. However, they can have negative effects on the environment. eutrophication – leaching causes the overenrichment of water with nutrients, leading to excessive algal growth and reduced oxygen levels reduced species diversity – nitrogen-rich soils can favor specific species (e.g. grasses) which may lead to other species being out-competed. Hubbard Brook Experiment
