祁連山北坡中部祁連圓柏葉片n、p-的時空變化特征及其生長策略的探討-畢業(yè)論文

1、I畢業(yè)論文論文題目（中文）論文題目（中文）祁連山北坡中部祁連圓柏葉片N、P的時空變化特征及其生長策略的探討論文題目（外文）論文題目（外文）TheTempalSpatialVariationsinLeafNPofQilianJuniperItsGrowthStrategyinthedlePartofNthernSlopesofQilianMountainNthwesternChinaIIITheTempalSpatialVariation

2、sinLeafNPofQilianJuniperItsGrowthStrategyinthedlePartofNthernSlopesofQilianMountainNthwesternChinaAbstractTheacteristicsofplantNPcanbeusedtodeterminewhichelementsarerestricted.Inadditiontheplantgrowthstrategytoadapttothe

3、habitatcanalsoreflectthetempalspatialvariationacteristicsofleafNP.TheregionalclimatechangeinthedleofthenthslopeofQilianMountainissensitivetotheglobalclimatechange.WecombinedtempalspatialvariationacteristicsoftheQilianjun

4、iperleafNPin3elevationbelts(2900m3300m4600m)ofQilianmountainwiththetreeheightDBHleafdrymattercontentexplingthegrowthstrategiesofQilianjuniper.Theresultsshowthat:1)theaveragecontentofQilianjuniperleafNis10.00mgg~0.80mgg~1

5、2.00mggtheaveragecontentofPis1.60mggtheaveragevalueofNPis7~13significantlylowerthantheaveragePNNPlevelofthewldChinavegetation.2)withtheincreaseofelevationthecontentofPofQilianjuniperleavesincreasedsignificantlyNPdecrease

6、dsignificantlyNcontenthasnosignificantchange.InthegrowingseasonthecontentofNinleavesofQilianjunipercontinuestorisewhilethecontentofPinhighaltitudelowaltitudetimeshowedtheoppositetrend.3)Qilianjuniperismainlyaffectedbythe

7、Nelementslimit.thehigherthealtitudeisthemeseriousthedegreeofrestrictionis.4)IndertoadapttothelocalclimateenvironmentinhighaltitudelowaltitudeQilianjuniperadoptdifferentgrowthstrategies.InlowaltitudeareaQilianjuniperismai

8、nlyaffectedbydroughtstressthedroughtresistanceoftreesincreasedbyincreasingleafdrymattercontent.InthehighaltituderegionQilianjuniperismainlyaffectedbylowtemperaturestressthecoldhardinessoftreesincreasedbyincreasingthecont