中国农业气象 ›› 2012, Vol. 33 ›› Issue (02): 202-206.doi: 10.3969/j.issn.1000-6362.2012.02.008

• 论文 • 上一篇    下一篇

氮对UV-B辐射增强条件下大麦孕穗期叶片生理特性的影响

娄运生, 武君, 于晋秋, 郭飞   

  1. 1南京信息工程大学江苏省农业气象重点实验室,南京210044;2广东省茂名市气象局,茂名525000
  • 收稿日期:2011-07-11 出版日期:2012-05-20 发布日期:2012-08-30
  • 作者简介:娄运生(1968-),河南睢县人,博士,教授,主要从事全球变化生态学研究。Email: yunshlou@yahoo.com.cn 娄运生, 武君, 于晋秋, 郭飞
  • 基金资助:

    国家自然科学基金项目(40871151);江苏省自然科学基金(BK2009413);教育部博士点基金项目(20103228110003);江苏省“青蓝工程”项目

Effects of Nitrogen Fertilization on Physiological Characteristics of Barley Leaves at Booting Stage under Enhanced UV-B Radiation

 LOU  Yun-Sheng, WU  Jun, YU  Jin-Qiu, GUO  Fei   

  1. 1Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing210044, China; 2Maoming Meteorological Bureau, Guangdong,Maoming525000
  • Received:2011-07-11 Online:2012-05-20 Published:2012-08-30
  • About author: LOU Yun-Sheng, WU Jun, YU Jin-Qiu, GUO Fei

摘要: 通过大田试验,研究在UV-B辐射增强条件下,不同施氮量对大麦孕穗期叶片净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)、叶片水分利用效率(WUE)及胞间CO2浓度(Ci)日变化的影响。UV-B辐射设两个水平,即对照(CK,自然光,辐射强度1.5kJ·m-2·h-1)和增强20%(1.8kJ·m-2·h-1);施氮量设两个水平,即低氮和高氮(30kg·hm-2和150kg·hm-2)。结果表明,UV-B辐射增强下,高氮处理的Pn、Tr、Gs和WUE的日平均值比对照分别下降了44.6%、21.8%、17.8%和28.4%; 低氮处理分别下降了49.5%、11.8%、12.9%和 42.7%,说明UV-B辐射增强可降低大麦叶片的光合作用和水分利用效率,而增施氮肥可缓解UV-B辐射增强对光合作用的影响,并缓解UV-B辐射增强对大麦净光合速率的抑制,但是并不能缓解UV-B辐射增强对蒸腾速率及气孔导度的抑制。Ci及Pn的日变化趋势表明,UV-B辐射增强及氮肥对大麦叶片光合作用的影响不是通过气孔,而是通过对光合作用反应过程的直接影响来实现的。

关键词: UV-B辐射, 施氮, 日生理特性, 大麦

Abstract: Field experiment was conducted to investigate the effects of nitrogen (N) supply on diurnal physiological characteristics in barley leaves at booting stage under enhanced UV-B radiation. The experiment was designed with two UV-B radiation levels, i.e. ambient (CK, 1.5kJ·m-2·h-1) and enhanced by 20% (1.8kJ·m-2·h-1), and two N supply levels, i.e. 30kg·ha-1(low) and 150kg·ha-1(high), and performed at the station of agricultural meteorology, Nanjing University of Information Science and Technology. The results showed that, enhanced UV-B radiation decreased net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductivity (Gs) and water use efficiency (WUE) by 44.6%, 21.8%, 17.8% and 28.4% under high N level, respectively, and reduced by 49.5%, 11.8%, 12.9% and 42.7% under low nitrogen level, respectively. The findings suggested that enhanced UV-B radiation depressed photosynthesis and water use efficiency in barley leaves, increasing N supply could alleviate the damage to net photosynthetic rate from enhanced UV-B radiation,but not to transpiration rate and stomatal conductivity. Based on the diurnal change of intercellular CO2 concentration in relation to net photosynthetic rate, it indicates that N supply and enhanced UV-B radiation impacted photosynthesis directly by the process of photosynthetic reaction, not by stomatal conductivity in barley leaves at booting stage.

Key words: UV-B radiation, Nitrogen fertilization, Diurnal physiological characteristics, Barley

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