![]() ![]() General: NOx enters atmosphere and combines with H2O to form acid rain NOx is a powerful greenhouse gas which leads to global warming/climate change Production of nitrogen based fertilizers has converted large amounts of N2 into NO3 Agriculture/use of fertilisers/biomass burning has added large amounts of NO3 to ecosystems Fossil fuel based cars/power plants release large amounts of NOx into atmosphere Over harvesting/irrigation has reduced mineral N in soils Release of sewage/livestock effluent has increased N content in waterways Explain human effects on the nitrogen cycle and predict the impact of these changes on an ecosystemĮffect on nitrogen cycle (no credit to be given for simply describing N cycle): Meter/ anemometer/thermometer/pH meter/Secchi disk Ģ. Use relevant/standardised/sampling method of measuring abiotic data eg light Use appropriate biotic sampling method eg randomised quadrats/water samples/kick samples/mark-release-recapture/Lincoln Index to establish abundance of species Īnd to use Simpson’s diversity index to establish species present/diversity ![]() ![]() ![]() Make a baseline study before human activity begins and repeat at regular intervals over time after the human activity / or at different distances from human activity Īward marks as follows for methods to record changes due to human activities (a) Describe the methods that may be used to record changes in a named ecosystem as a result of human activities.įor full credit, response must include a named ecosystem eg Alpine Pine Forest in Swiss Alps.Īward for establishing control/baseline and repetition: ![]()
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