Effects of moisture stress on Douglas-fir physiology and gr

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1、EffectsofmoisturestressonDouglas-firphysiologyandgrowthTomHinckley,CollegeofForestResources,UniversityofWashington,Seattle,WAContentofJanuary29meeting-1Rain,cloud,&fog:Quantity,intensity,timingSnow:quantity,elevation,rain-on-snow,etc.Sun:Quantity,vaporpressuregradientClimate,climatechangeFuture•Jere

2、myLittell•DaveSpittlehousePast•ReneeBrooksPrefaceIntroductionContextMethodsImpactsWater&NitrogenContentofJanuary29meeting-2PrefaceIntroductionContextMethodsImpactsWater&NitrogenGroundwaterHydraulicredistribution•FrederickMeinzerSoilmoisture•JeffreyMcDonnellSoilpropertiesSoilwatercontentHydraulicCond

3、uctivityContentofJanuary29meeting-3PrefaceIntroductionContextMethodsImpactsWater&NitrogenSite:Microclimate&topographyPhysiology&Growth•TomHinckleyWaterUseEfficiency•AndyBlackClimate:WeatherOutline•Context•Majorphysiologicalprocessesaffectedbymoisturestress•Methodsforassessingtreemoisturestress•Water

4、-userequirements•Soilwatertensionsandplantwaterpotentialthresholdsthatresultingrowthreductionstogrowthcessation•Doesfertilizationimprovewater-useefficiency?PrefaceIntroductionContextMethodsImpactsWater&NitrogenWholePlantContextAnintegratedsystemWaterlossatfoliagelevelWatertransportWateruptakeImporta

5、nttonotethatnitrogenstresshasbeenregardedasthemaincontrolofgrowth&productivityinDouglas-firinPNWPrefaceIntroductionContextMethodsImpactsWater&NitrogenSimpleModelofHowTreesMightRespondtoStressDoesthemodelwork?LeafGrowthCarbonProductionCarbonStorageRootGrowthWater&NutrientUptakeWater&NutrientUtilizati

6、onBelowgrdstress:•nutrients•water•oxygenAbovegrdstress:•light•ozone•herbivoryPrefaceIntroductionContextMethodsImpactsWater&NitrogenResponsesToBelowgroundStressReichetal.(1980.ForestScience26:590)Quercusspp.Borchert(1975.PhysiologiaPlantarum35:152)Quercusspp.TreeScalePrefaceIntroductionContextMethods

7、ImpactsWater&NitrogenIndividualTreeResponseCont.ExperimentwithDouglas-firandnitrogen(Friendetal.1990.Can.J.For.Res.)PrefaceIntroductionContextMethodsImpactsWater&NitrogenStandResponseKeyesandGrier(198