【作者】 钱晓晴； 封克； 王娟娟； 倪梅娟； 柏彦超； 司江英； 顾竹英； 周明耀；

【Author】 QIAN Xiao-qing1,Feng Ke1, WANG Juan-juan2, NI Mei-juan1, BAI Yan-chao1, SI Jiang-ying1, GU Zhu-ying1, ZHOU Ming-yao3 (1.College of Environmental Sciences and Engineering, Yangzhou University, Yangzhou 225009;2. Institute of Mathematics and Natural Science, Leiden University, The Netherlands;3. College of Hydraulic Sciences and Engineering, Yangzhou University, Yangzhou 225009)

【机构】 扬州大学环境科学与工程学院； 荷兰莱顿大学数学与自然科学研究所； 扬州大学水利科学与工程学院；

【摘要】 为了探明不同水、氮供应条件下水稻的部分水分生理特征,设置了正常水分与模拟水分胁迫、铵态氮和硝态氮不同施用比例处理,培养水稻作物,探讨其对水稻的部分水分生理特征的影响。水分处理包括正常水分及50g/LPEG模拟水分胁迫,氮素处理包括三种不同NH4+-N/NO3--N比例(75/25,50/50,25/75)的处理。结果表明,在NH4+-N/NO3--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NO3--N。模拟水分胁迫条件下,水稻幼苗叶片浸出液电导率随NH4+-N/NO3--N比例的降低呈下降趋势,且在NH4+-N/NO3--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NH4+-N/NO3--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NH4+-N/NO3--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/NO3--N处理防止了水分胁迫引起水稻叶片水势的降低。低NH4+-N/NO3--N能减轻水分胁迫对水稻水分生理变化的不良影响。更多还原

【Abstract】 A water cultivation experiment, with/without PEG at 50 g/L, was treated with different ration of NH4+-N and NO3--N (75/25,50/50,25/75) to evaluate the effects of different forms of nitrogen nutrition on some water-physiological response of rice cultivated under different water regimes conditions. The results obtained were as follows. Much amount of NO3--N was absorbed by Guanglin Xiangjing rice seedling treated with low NH4+-N/NO3--N under simulating water stress condition. Conductance of lixivium from the leaf of rice seedling was decreased with decreasing of NH4+-N/NO3--N ratio. And the conductance value of lixivium from the leaf of rice seedling treated with NH4+-N/ NO3--N at the ratio of 25/75 under simulating water stress condition was even below that under none water stress condition. On the contrary, the conductance value of lixivium from the leaf of rice seedling under none water stress condition was increased with the decreasing of the ratio of NH4+-N/ NO3--N. Relative water content of the leaf of rice treated with high ratio of NH4+-N/NO3--N was decreased and critical saturation deficiency increased by the treatment of simulating water stress while almost no influence of the water stress on relative water content and critical saturation deficiency of the leaf treated with lower ratio (25/75) of NH4+-N/ NO3--N. Similarly, supply with lower ratio (25/75) of NH4+-N/ NO3--N was able to prevent leaf water potential from decreasing caused by simulating water stress. High ratio of NO3--N supply would lighten the blight of water stress to rice water-physiological response.更多还原