biogeochemical cycles-nitrogen
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where is nitrogen found in the lithosphere
soil-nitrates ect. rocks-minerals containing nitrogen.
what is ionisation
lightning provide energy for nitrogen and oxygen to react to produce oxides of nitrogen.
what is fixation
some microorganisms can chemically reduce nitrogen to ammonia e.g symbiotic bacteria is root nodules.
what is dentrification
chemical reduction of nitrates in soil to nitrogen and nitrogen oxide gas.
leaching
the high solubility of nitates means they are easily leached out of soils into water bodies.
ammonification
decomposition-amino groups are released
how does the harber process effect the nitrogen cycle
producing ammonia from nitrogen and hydrogen using an iron catayst, this sues large amounts of energy. Ammonia can then be converted into nitrates for agricultural processes.
what effect does agriculture have on the nitrogen cycle
nitrate fertilisers-increase problems caused by leahate and eutrophication. -soil disturbance increases decomposition increasing more nitrogen oxides.
sustainable management of the nitrogen cycle
control of combustion processes-reduce Nox release -control of NOx release - catalytic convertors. –managemnt of biological wastes. -eutrophication. organic fertilizers. -management of soil processes. e.g cultivation og legumenous crops.