水分脅迫對鵝掌楸屬苗木生理影響的研究.pdf

1、Y906509分類號密級南京林業(yè)大學(xué)學(xué)位代碼309學(xué)校代碼10298學(xué)號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