sustainableyieldpracticeproblems：可持续产量的实践问题

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1、SUSTAINABLEYIELDPRACTICEPROBLEMSNAME______________________________1.SustainableyieldcanbedefinedasI.annualgrowthandrecruitment–annualdeathandemigrationII.(totalbiomassttimet+1)–(totalbiomassattimet)III.Thehighestrateatwhichnaturalcapitalcanbeexploitedwithout

2、reducingitsoriginalstock.a.IandIIonlyb.IandIIIonlyc.IIandIIIonlyd.I,IIandIII2.Inadeerpopulationof1000,eachyearanaverageof100diefromnaturalcausesand250areborn.Assumingnoimmigrationoremigration,thesustainableyieldis_____.a.100b.150c.350d.11503.Foraparticularye

3、ar,forthefishinggroundsofanislandnation,assume:R=thebiomassofyoungfishreachingharvestablesizeG=thegrowthinbiomassoffishalreadyofharvestablesizeM=thelossoffishthroughdeathandemigrationB=thebiomassofthetotalfishpopulationatthestartoftheyearThesustainableyieldo

4、fthefishinggroundscouldbecalculatedusingwhichofthefollowing?a.R+G–Mb.M–Mc.B+R+G–Md.R+G4.Whatisthemaximumsustainableyieldforaresource?a.Thedifferencebetweennaturalcapitalandnaturalincomeb.Therateofdecreaseinnaturalcapitalc.Thesustainablerateofharvestofaresour

5、ced.Thepointatwhichtheoriginalstockisdepleted5.Whatisthemaximumsustainableyieldofacropequalto?a.Naturalincomeb.Naturalcapitalc.Carryingcapacityd.Totalbiomass6.Iftheharvestingofafishpopulationweretoexceedthesustainableyieldinoneyear,thiswouldmeana.Thenaturalc

6、apitalhadbeenreducedbutthenaturalincomehadincreased.b.Thenaturalcapitalremainedthesamebutthenaturalincomehadbeenreduced.c.Thenaturalcapitalhadbeenreducedandthenaturalincomewouldbereducedinthefollowingyear.d.Thenaturalcapitalremainedthesamebutthenaturalincome

7、wouldbereducedinthefollowingyear.7.Resourcesthathaveasustainableyieldequaltotheirnaturalproductivityarea.Naturalincomeb.Renewablenaturalcapitalc.Replenishablenaturalcapitald.Non-renewablenaturalcapital1.Aforesthasavolumeof800000millionm3oftimber.Inoneyear,15

8、0000m3oftimberareharvestedand100000m3oftimberareaddedbynormaltreegrowth.Whichofthefollowingstatementsiscorrectwithregardtothisyear?a.Themaximumsustainableyieldwas800000millionm3oftimberb.Harvest