18-Ecosystem Energy Movement_student.pptx - Movement of...

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Movement of Energy in Ecosystems
Lesson objectivesUnderstand how energy moves through an ecosystemDescribe different ways to measure productivityCompare net productivity among different ecosystemsUnderstand how nutrients can affect productivityCalculate trophic efficiencies
Solar energy powersphotosynthesis of producersFew ecosystems use chemicalenergy for chemosynthesisProducers form base of food websThe sun is the ultimate source of energyfor most ecosystems1% of solar energy is captured
Gross primary productivity(GPP)rate that energy is captured andassimilated by producersEnergy used for respiration,growth, reproductionNet primary productivity(NPP)rate that energy is assimilatedinto producer biomassStanding cropNPP = GPP - respirationPrimary productivity is the rate at which energy isconverted into organic compounds in producersGPP = 2.5 kg C/m2/yrRespiration = 1.5 kg C/m2/yrNPP = 1 kg C/m2/yr
How can primary productivity be quantified?ProducerbiomassRemotesensingUptake/Release ofCO2or O2Light-dark bottle experimentsNPP = net CO2GPP = net CO2+ respired CO2Terrestrial vs AquaticNPP =net O2GPP = net O2+ respired O2NPP = GPP - respirationGPP-R+GPP-RGPP = NPP + respirationR

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Term
Fall
Professor
Kabirul Islam
Tags
Ecology, trophic level, NPP

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