Abstract：[Background] Many rominent problems,such as thin soil,destruction of arid vegetation,water and soil loss, and ecological deterioration present in the abandoned diggings. Artificial recovery of forests is a quick and effective approach to restore the ecology of such regions. The primary problem of vegetation restoration is to select suitable plant species.[Methods] Potted one-years-old seedlings of Prunus sibirica were used in this study, and drought stress was controled by natural evapotranspiration.The control group was conducted by normal water management. The experimental group was subjected to drought stress treatment. The soil water potential (Ψs), leaf water potential (Ψl) and the gas exchange parameters, such as net photosynthetic rate (Pn), transpiration rate (Tr),stomatal conductance (Gs), intercellular CO2 concentration (Ci), atmosphere CO2 concentration (Ca), atmosphere relative humility (RH), air temperature (ta), leaf temperature (tl) and photosynthetic active radiation (PAR) were measured. The physiological responses of P. sibirica to drought stress were analyzed, and its drought resistance mechanism was expolored.[Results] 1) The results indicated that the Ψs and Ψl of the control group and atmosphere water potential (Ψa) demonstrated a very small fluctuation. Furthermore, Ψs and Ψl of the experimental group were on a downward trend in the consecutive 7 days of soil drought stress. The decrease range of Ψl was obviously less than that of Ψs because leaves of P. sibirica absorbed atmospheric condensation. 2) The daily averages of Tr, Pn and Ci of P. sibirica in the control group in consecutive 4 days presented little changes. With soil drought stress condition lasting, the daily averages of Tr and Pn of P. sibirica of the experimental group in consecutive 4 days decreased significantly and its daily averages of Ci increased significantly (P<0.05), respectively. The threshold value of Ψs was -0.27 MPa in which, photosynthetic limitation was changed from stomatal to non-stomatal. 3) As the effect of tissue water capacitance (C) and water suction (ΔΨs-l) of P. sibirica in the experimental group, the diurnal fluctuation of Ψl lagged those of Ψs, when Ψs was above the mean value of permanent wilting point of most plants (-1.5 MPa).In addition, diurnal fluctuation of Ψl and Ψs stayed synchronously, when Ψs was below it.[Conclusions]P. sibirica has an adaption to drought environment with the mechanisms of absorbing atmospheric condensation, enhancing the ΔΨs-l, tissue releasing water, and stomatal adjustment, and can be used as suitable plant species for ecological restoration and barren mountain afforestation in diggings area.
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2019, Vol. 17 
