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1、HighSoilCarbonDioxideConcentrationsInhibitRootRespirationofDouglasFirAuthor(s):JingenQi,JohnD.Marshall,KimG.MattsonReviewedwork(s):Source:NewPhytologist,Vol.128,No.3(Nov.,1994),pp.435-442Publishedby:BlackwellPublishingonbehalfoftheNewPhytologistTrustStableURL:http://www.jstor.org/stable/2558294.Ac
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4、tol.(1994),128,435-442HighsoilcarbondioxideconcentrationsinhibitrootrespirationofDouglasfirBYJINGENQI,JOHND.MARSHALL*ANDKIMG.MATTSONDepartmentofForestResources,UniversityofIdaho,Moscow,ID83844-1133,USA(Received9December1993;accepted30May1994)SUMMARYTotalandbasalrespiration(RtandRb,respectively)ofi
5、ntactandundisturbedrootsofone-year-oldDouglasfirseedlings,Pseudotsugamenziesiivar.glauca[Beissn]Franco,weremeasuredatexperimentallyvariedsoilcarbondioxideconcentrations([CO2]).UseofspeciallydesignedrootboxesandaCO2gas-flowcompensatingsystemdesignedaroundaninfraredgasanalyzer(IRGA)allowedcontrolled
6、deliveryofCO2torootsandsimultaneousmeasurementsofCO2releasedbyroots.Rootrespirationraterespondedtoeachinlet[CO2],independentofwhetherthepreviousconcentrationhadbeenhigherorlower,withintwotothreehours(pairedttest=0-041,P=0-622,andn=13).Totalandbasalrespirationratesdecreasedexponentiallyassoil[CO2]r
7、osefrom130ppm,wellbelowatmospheric[CO2],to7015ppm,aconcentrationnotuncommoninfieldsoils.Analysesofvariance(ANOVA)showedthattheeffectsofsoil[CO2]onratesoftotalandbasalrootrespirationwerestatisticallysignificant.Ro
