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由于盐害及干旱经常同时发生,因而作物对二者双重胁迫的反应引起了人们极大的关注。本文利用生长室研究了不同基质势和渗透势对小麦、大麦、大麦茎根生长的效应。实验中应用人工盐化沙壤土,种子首先在无盐土壤中萌发,然后移栽到具有不同渗透势和基质势的土体上,培养8天。结果表明,-0.1—-1.0MPa的渗透势和-0.01～-2.5MPa的基质能抑制茎、根的生长,但二者的胁迫效应在量上不定等同,在较高胁迫水平下,二者之间明显存在互作。在大多数盐分处理中,根系在较干旱土壤中的生长优于较湿润土壤,可能由于潮湿土壤中较快的物质流动使根系周围的盐分积累较多,从而抑制根系生长。
Due to the frequent occurrence of salt damage and drought, the response of crops to the double stresses of both has aroused great concern. In this paper, growth chamber was used to study the effects of different substrate potentials and osmotic potentials on the growth of stems of wheat, barley and barley. Artificial salinized sandy loam soil was used in the experiment. The seeds were firstly germinated in salt-free soil and then transplanted to soil with different osmotic potential and matrix potential for 8 days. The results showed that the osmotic potential of -0.1-1.0 MPa and the substrate of -0.01-2.5 MPa inhibited the growth of stem and root, but the stress effects of the two were indefinitely the same in quantity. Under higher stress level, There is an obvious interaction between them. In most salt treatments, root growth in the arid soils was superior to that in the arid soils, probably because of faster accumulation of salt around the roots due to faster flow of material in moist soils.