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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
