2023年全國碩士研究生考試考研英語一試題真題(含答案詳解+作文范文)_第1頁
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1、寧夏大學碩士學位論文紅麻和印第安麻解剖結構及抗旱生理生態(tài)特性的研究姓名:王東清申請學位級別:碩士專業(yè):生態(tài)學指導教師:李國旗201103寧夏大學碩士學位論文AbstractIIIAbstractIndertofindoutthecopingstrategiesadaptabilitytoaridenvironmentofA.veumA.cannabinumwestudiedtheanatomicalstructureofnutritiv

2、egansecophysiologicalacteristicsofdroughtresistanceoftwospeciesofApocynumbasedonwhichevaluationindexessystemwasestablishedtoprovidetheeticalbasisfintroductioncultivationrationalexploitationutilizationofApocynuminNingxia.

3、Themainconclusionswereasfollows:1.AnatomicalresearchonnutritivegansoftwoApocynum(1)TheleafoftwoApocynumspeciesisbifacial.Theleafepidermalcelloftwospecieshavecuticlelayerwithdifferentthickness.Substomaticchamberdevelopedw

4、ell.Botharewithtwolayersofpalisadetissues.ComparedwithA.cannabinumthepalisadetissuesofA.veumarrangedmetightbutspongytissuesmeloose.VeintissuesofA.cannabinumdevelopedwellthethicknessofmajveinisupto489.61μm,significantlyth

5、ickerthanthatinA.veum(369.29μm).(2)ThevularbundleofstemfbothApocynumspeciestypicallybelongtobicollateralbundle.(3)PeridermcelllayersofrootsinA.veumwas4~5layerswhileinA.cannabinum5~7layers.Thereisalargerootctextissuefboth

6、species.(4)Alargenumberofsecretycellswereobservedintherootsstemsleavesfbothspecies.2.EffectofdroughtstressonwaterphysiologicalactersoftwoApocynum(1)Withtheaggravationofdroughtstresstheleafwatercontentrelativewatercontent

7、fbothApocynumdecreasedgraduallycomparedwithA.cannabinumA.veumdecreasedgreatlyInthesamesoilwatergradetheleafwatercontentrelativewatercontentofA.cannabinumweresignificantlyhigherthanthatofA.veumbutwatersaturationdeficitwas

8、lowerthanthatofA.veum.(2)UnderthedifferentconditionsofdroughtstresstherelativewatercontentofleavesinvitroofA.veumsharplydeclinedaftertwohoursdeclinedsignificanthigherthanthatofA.cannabinum(P0.01)After8hourstherelativewat

9、ercontentofleavesinvitroofA.cannabinumweremaintainedathigherlevel.(3)WiththeaggravationofdroughtstressthefreewatercontentofleavesfbothApocynumdecreasedgraduallyTheboundwatercontentofA.cannabinumhadbeenstabilizedwhilethec

10、ontentofA.veumdecreasedgreatlyunderseverestress(T3)conditionInthesamesoilwatergradetheboundwatercontentofA.cannabinumweresignificantlyhigherthanthatofA.veum.Inadditionwiththeaggravationofdroughtstressthevalueofboundwater

11、tofreewaterofA.cannabinumincreasedgraduallywhilethevalueofA.veumdecreasedsignificantlyunderseverestress(T3)condition.3.EffectofdroughtstressonphotosyntheticacteristicsoftwoApocynum(1)UndertreatmentsofCKT1T2thediurnalcurv

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