紅麻和印第安麻解剖結(jié)構(gòu)及抗旱生理生態(tài)特性的研究.pdf

1、寧夏大學(xué)碩士學(xué)位論文紅麻和印第安麻解剖結(jié)構(gòu)及抗旱生理生態(tài)特性的研究姓名：王東清申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：生態(tài)學(xué)指導(dǎo)教師：李國旗201103寧夏大學(xué)碩士學(xué)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