Limits to Growth and Human Carrying Capacity Vinlove增长的极限承载力与人 vinlove ppt课件.ppt

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1、LimitstoGrowthandHumanCarryingCapacityEnduringUnderstanding:Waterandsoilarevaluableresources,whichmustbeusedmorecarefullyasthehumanpopulationgrows.2.Muchofthecurrentagriculturalpracticesresultinsoildegradationandwaterpollution.Thusourfoodsupplyisunsustainable.3.Nonrenewableenergyresourceswillb

2、econsumedatsomepoint,makingthedevelopmentofrenewableresourcesveryimportant.4.Reductioninwastesthroughrecycling,reuseandremanufacturingwillbecomemoreimportantasthepopulationincreases.5.Humanpopulationsimportmaterials,makingitdifficulttoestimatethecarryingcapacityofanarea.K:CarryingCapacityThenu

3、mberofindividualsagivenareaoflandorwatercansustainablysupportovertime.Thecarryingcapacityforhumansistheinverseoftheecologicalfootprint.FootprintvsCarryingCapacityTheCarryingCapacityforHumansistheinverseoftheecologicalfootprint.Reviewthedefinitionofecologicalfootprinttocheckthis!LimitingFactors

4、Limitingfactorsarefactorsorresourcesthatlimitthesizeofapopulation.Thepopulationcannotgrowlargerbecauseoftoomuchortoolittleofafactor.Example10rabbitsmayliveinahabitatthathasenoughwater,coverandspacetosupport20rabbits.ifthereisonlyenoughfoodfortenrabbits,thepopulationwillnotgrowanylargerthan10.F

5、oodisthelimitingfactorLimitingfactorssetalimitonpopulationgrowthFood,water,nestingsites,predationKversusrstrategistsKstrategiststendtohaveafewoffspringthatreceivealotofparentalcare.Examples:birds,elephantsandhumansrStrategiststendtohavemanyoffspringwithnoparentalcare.Ex:spiders,fishCompareKtor

6、strategistsSigmoidcurvephases1.Lagphase2.ExponentialGrowth(RapidGrowth)3.StablephaseAmorerealisticpopulationgrowthcurveManypopulationsovershootthecarryingcapacityHumanPopulationGrowthWhatdoyouthink?“Ifwefailtobringpopulationgrowthandoverconsumptionundercontrol,thenwewillinhabitaplanetwherelife

7、becomesincreasinglyuntenable.”-PaulEhrlichAuthorofThePopulationBombFoodAnestimated1in6peoplesufferfromhungerandmalnutritionwhileattemptstogrowfoodaredamagingswathesofproductiveland.-BBCWaterBy2025,two-thirdsoftheworld'speoplearelikelyto