1、Y906509分類號(hào)密級(jí)南京林業(yè)大學(xué)學(xué)位代碼309學(xué)校代碼10298學(xué)號(hào)030199，≯i研究生碩士學(xué)位論文i￡i。一。。一。。。。。。一。。f論文題目作者專業(yè)研究方向指導(dǎo)教師水分脅迫對(duì)鵯掌揪屬苗木生理影響的研究黃韶承森林培育種苗學(xué)沈水寶教授二oo六年六月AbstractThedroughtstress(fourtreatmentleveloftheSoilmoisture，respectivelythecontainofsoilont

2、hefieldcapacityOWl：20％士5％、②W2：40％士5％、③：60％5％、④：80％5％)、waterloggingstress(thewaterlevelhigher2—5cmoftheseedlingroot)、waterloggingstressanddrain(drainafterwaterloggingfourdays)ofLiriodendronchinenseSarg、Lchinensex上tulipfer

3、a、LtulipiferaL，annualseedlingthreedifferentvariety／fourprovenanceswerestudied，byoverallandsystematiccomparativeanalysisonthephotosyntheticcharactersandphysiologicalbiochemistrytraits，thepurposeistoprovidetheorybasisforth

4、efuturescientificmanagementandculturinghighqualityseedlingsBytestingandanalysisofmanyindexes，theresultsasfollows：l、TheinjuryoftheLiriodendronchinenseseedlingunderdroughtstressismoreseriouswitllthesoilmoisturefromthelivab

5、ilityandwholebehaviorthesequenceofdroughtresistancefromthehightolowis：theLtulipiferaL(NoahCarolina)上chinensexLtulipferaLtulip瞻raL(Louisiana)LiriodendronChinense；Duringthecourseofwaterloggingexperiment，theleavesWilting、dr

6、yingup、reactiontimeofturningyellowonthedifferentLiriodendronchinenseseedingaredifferent，changedegreeisalsodifferentOnthewhole，thesequenceofwaterloggingresistance：Lchinensex三tulipferaLtulipiferaL(NorthCarolina)Ltulipifera

7、L(LouisianalLiriodefdronChinenseTheinjurydegreeofLchinensexLtulipferaandLtulip咖r(1L(NorthCarolina)aresmallerinthedrainafterwaterloggingfourdaysandrecoveryfasterWaterstressbroughtsignificanteffectontranspirationrate、netph

8、otosyntheticrate、stomatalconductance、intercellularC02concentrationoftheLiriodendronchinense，allindexeshavesignificantdifferencealongwiththesoilwatercontentanddifferentwaterloggingtimeGenerallyvarianceregularofPn、Gs、Trare

9、similarButCiiscontraryFollowingtheairexchangemodelofthephotosyntheticaction，theresultsshow：thegreatdecreaseofnetphotosyntheticrateowetostomatalconductancedeclineandphotosyntheticabilitydecreaseofmesophyllcells3、Therootvi

10、gor、ConductivitySODvigor、PODvigor、MDAcontentofdifferentprovenanceshavesignificantdifferenceTherootvigorofLtulipiferaL(NorthCarolina)ishighest；TheeffectsoftheConductivitySODvigor、PODvigorofLchinensexLtulipferaaresmaller；h

11、owever，theMDAcontentshowsdecreasedtrend4、’Thechlorophyllcontentsamongdifferentprovenanceunderdroughtstressroseintheearlystageanddecreasedthen，decreaseextentofLchinensexLtulipferaisslowlyLiriodendronChinenseserious；111ech

12、lorophyllcontentsamongdifferentprovenanceunderwaterloggingstressdecreasedwiththestresstimeincrease，thesequenceofthewaterloggingresistanceis：三chinensex￡tulipfera三tuliplye陽L(NorthCarolina)上tulipiferaL(Louisiana)Liriodendro