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Northwest A&F University (2020)

Effects of Drought Stress and Rewatering on Growth and Physiological Characteristics of Platycladus Orientalis and Amorpha Fruticosa Seedlings

冯树林;

Titre : Effects of Drought Stress and Rewatering on Growth and Physiological Characteristics of Platycladus Orientalis and Amorpha Fruticosa Seedlings

Auteur : 冯树林;

Grade : Doctoral Dissertation 2020

Université : Northwest A&F University

Résumé partiel
Drought stress caused by soil water deficit is not only a major obstacle to plant growth and artificial vegetation construction in arid areas,but also affects global ecological security and socio-economic sustainable development.With the global climate change and the increase of greenhouse effect,the problem is becoming more and more serious.However,the effect of the important phenomenon of"drying-wetting"on the growth,morphology and physiology of woody plants at different growth stages in different regions caused by precipitation fluctuation is not well elucidated.For this reason,the seedlings of Platycladus orientalis and Amorpha fruticosa were selected as the experimental materials to carry out the pot experiment under rain-protected shed.The soil relative water content(SWC)was maintained at 100%as the control.The effects of different drought degrees(87.84%SWC,70%SWC,52.16%SWC and40%SWC)and drought duration(15d,30d,45d and 60d)on the growth and physiology of the seedlings of P.orientalis and A.fruticosa at different growth stages,and their recovery performances under the condition of rehydration after drought stress were studied.The main results are as follows:1.The response of the growth of P.orientalis and A.fruticosa seedlings at three growth stages were different under drought stress and rewatering conditions,and the compensatory growth effect on the seedlings of two tree species after rewatering was in the order of Initial growth stage(IGS)>Fast growth stage(FGS)>Later growth stage(LGS).In IGS and FGS,the compensation effect of rehydration after drought on plant height,basal diameter,leaf and root growth,and biomass accumulation of two tree species seedlings was higher in the treatments with 87.84%SWC and 70%SWC than that of 52.16%SWC and 40%SWC.In LGS of two tree species seedlings,the growth indicators were lower than the control level,and the growth compensation effect of rehydration after drought was not obvious.In IGS of P.orientalis seedlings,the average biomass of 70%SWC treatment was the highest under four drought durations,which was 27.52%higher than that of the control ;In FGS of P.orientalis seedlings,the average biomass of 87.84%SWC treatment was the highest under four drought durations,which was 15.32%higher than that of the control.In IGS and FGS of A.fruticosa seedlings,the average biomass of 87.84%SWC treatment reached the highest level under four drought durations,which increased by 25.59%and 11.04%compared with control,respectively.2.Leaf water potential of P.orientalis and A.fruticosa seedlings decreased gradually with the aggravation of drought stress.52.16%SWC and 40%SWC treatments had significant effects on leaf water potential at different growth stages of seedlings of two tree species,indicating that the decrease of leaf water potential at different growth stages of seedlings of two tree species was closely related to soil moisture content.

Mots clés : Afforestation species; Growth stage; Physiological characteristics; Drought stress; Rewatering;

Présentation (CNKI)

Page publiée le 15 juin 2021, mise à jour le 22 octobre 2021