科研之友
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摘要
Background: Amygdalus pedunculata Pall is a deciduous shrub of the genus Amygdalus in the Rosaceae family. It is widely used for desertification control in arid and semi-arid regions in northwest China, but how it responds to water stress in soils of different textures is elusive. Objective: This study aims to investigate the response of Amygdalus pedunculata Pall to water stress in soils of different textural in order to provide guidance for better use of Amygdalus pedunculata Pall to control desertification in arid and semi-arid regions in northwest China. Method: The experiment was conducted in columns packed with sandy and loamy soils commonly seen in this region. We compared five water levels: 90%±5% FC (field capacity), 75%±5% of FC, 60%±5% of FC, 45%±5% of FC and 30%±5% of FC, each having four replicates. The experiment lasted five months from April to September in 2018, during which we measured the net photosynthetic rate (Pn), stomatal conductance (Gs), leaf water potential (Ψw) and transpiration (W-Tr) of the plant 3 to 4 times every month. Result: As the soil moisture decreased with time, Pn, Gs and W-Tr in all columns increased initially followed by a decline, while Ψw fell monotonically during the whole experimental period. When water content was the same, Pn, Gs, Ψw and W-Tr of the plant in all growth stages differed between the two soils, but discrepancy was inconsistent and varied with water content. Pn, Gs, W-Tr of the plant grown in the loamy soil were higher those in sandy soil when soil moisture >60% of FC, while the opposite was true when the soil moisture was <60% of FC. Conclusion: Amygdalus pedunculata Pall responded differentially to water stress and soil texture. It appeared that the plant was more adaptive in the sandy soil than in the loamy soil with water stress increasing. These findings offer guidance for the revegetation program in the Loess Plateau where soil texture and soil moisture are both highly heterogenous.
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