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为探明不同水分供应和氮素形态对水稻一些水分生理特征的影响,设正常水分及50 g L-1PEG模拟水分胁迫及3种不同NH+4-N/NO-3-N比例(75/25,50/50,25/75)的处理,测定了水稻叶片的NO-3、Ca2+和Mg2+含量,叶片浸出液电导率,叶片相对含水量,叶片水分临界饱和亏以及叶片水势。结果表明,在NH+4-N/NO-3-N比例较低时,模拟水分胁迫使广陵香粳水稻幼苗吸收更多的NO-3-N。模拟水分胁迫条件下,水稻幼苗叶片浸出液电导率随NH+4-N/NO-3-N比例的降低呈下降趋势,且在NH4+-N/NO-3-N比例为25/75时,叶片浸出液电导率低于正常水分培养条件下的叶片浸出液电导率。而在正常水分培养条件下,水稻幼苗叶片浸出液电导率随NH+4-N/NO-3-N比例的降低呈上升趋势。水分胁迫使高NH4+-N/NO3--N处理水稻叶片相对含水量降低、水分临界饱和亏上升,但对低NH+4-N/NO-3-N处理(25/75)水稻叶片相对含水量和水分临界饱和亏影响很小。同样,低NH4+-N/NO-3-N处理削弱了水分胁迫对水稻叶片水势的降低。总体上说,低NH4+-N/NO3--N能减轻水分胁迫对水稻水分生理的不良影响。
To investigate the effects of different water supplies and nitrogen forms on some water physiological characteristics of rice, normal water and 50 g L-1PEG simulated water stress and three different NH + 4-N / NO-3-N ratios (75 / 50, 50, 25/75). The content of NO-3, Ca2 + and Mg2 + in rice leaves, the conductivity of leaf leachate, the relative water content of leaves, the critical saturation loss of leaf water and the leaf water potential were measured. The results showed that under the condition of low NH + 4-N / NO-3-N ratio, rice seedlings of Guangling-Xiangjing could absorb more NO-3-N under simulated water stress. Under the condition of simulated water stress, the conductivity of leachate in rice seedling leaves decreased with the decrease of NH4 + -N / NO3-N ratio, and when NH4 + -N / NO3-N ratio was 25/75, The conductivity of the leachate is lower than that of the leaf leachate under normal moisture culture conditions. Under normal water culture conditions, the conductivity of leachate in rice seedlings increased with the decrease of NH 4 + -N / NO 3 -N ratio. Under the condition of water stress, the relative water content decreased and the critical saturation loss increased in high NH4 + -N / NO3 - N treated rice leaves. However, the relative leaf content in rice leaves treated with low NH4 + -N / NO3-N (25/75) The effect of water saturation and moisture saturation is small. Similarly, low NH4 + -N / NO-3-N treatment impaired water stress on rice leaf water potential reduction. In general, low NH4 + -N / NO3 - N could mitigate the adverse effects of water stress on rice hydrophyte physiology.