中国农业气象 ›› 2013, Vol. 34 ›› Issue (06): 668-672.doi: 10.3969/j.issn.1000-6362.2013.06.008

• 论文 • 上一篇    下一篇

UVB增强下施硅对大麦抽穗期光合和蒸腾生理日变化的影响

娄运生,韩艳,刘朝阳,孟艳,吴蕾   

  1. 南京信息工程大学应用气象学院,南京210044
  • 收稿日期:2013-03-24 出版日期:2013-12-20 发布日期:2014-05-06
  • 作者简介:娄运生(1968-),河南睢县人,博士,教授,主要从事生态气象与全球变化生态学研究。Email: yunshlou@sohu.com
  • 基金资助:

    国家自然科学基金项目(41375159);江苏省自然科学基金(BK20131430);教育部博士点基金项目(20103228110003);江苏省“333工程”项目

Effects of Silicon Fertilization on Diurnal Variations of Photosynthesis and Transpiration at Barley Heading Stage under Elevated UVB Radiation

LOU Yun sheng,HAN Yan,LIU Zhao yang,MENG Yan,WU Lei   

  1. College of Applied Meteorology,Nanjing University of Information Science & Technology,Nanjing210044,China
  • Received:2013-03-24 Online:2013-12-20 Published:2014-05-06

摘要: 通过大田模拟试验,研究UVB增强下施硅对大麦抽穗期叶片净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)、胞间二氧化碳浓度(Ci)和水分利用效率(WUE)日变化的影响。UVB辐射设2个水平即自然光(对照,A,1.5kJ·m-2)和UVB增强(E,增强20%,1.8kJ·m-2),施硅量设2个水平即Si0(不施硅)和Si1(150kg·hm-2SiO2)。结果表明,不施硅情况下(Si0),UVB增强处理的Pn、Tr、Gs和WUE的日平均值比自然光(A)处理分别下降23.13%、7.66%、1.07%和16.38%,而施硅情况下(Si1)则分别下降10.52%、5.71%、3.77%和12.15%,说明UVB增强可降低大麦叶片的净光合速率、蒸腾速率和水分利用效率,而施硅可缓解UVB增强对大麦净光合速率的抑制作用,但并不能缓解UVB增强对大麦蒸腾作用以及气孔导度的抑制。研究结果对进一步研究UVB增强下施硅对大麦产量和品质的影响具有积极意义。

关键词: UVB辐射, 施硅, 大麦, 光合作用, 蒸腾作用

Abstract: Field simulating experiment with barley was conducted to investigate the effects of silicon(Si)supply on diurnal variations of net photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductivity(Gs),intercellular CO2 concentration(Ci)and water use efficiency(WUE)under elevated UVB radiation The experiment was designed with two UVB radiation levels,ieambient(A,1.5kJ·m-2)and elevated UVB(E,1.8kJ·m-2),and two Si supply levels,ieSi0(0kg·ha-1 SiO2)and Si1(150kg·ha-1 SiO2)The results showed that,compared with ambient UVB radiation,elevated UVB radiation decreased net photosynthetic rate,transpiration rate,stomatal conductivity and water use efficiency by 23.13%,7.66%,1.07% and 16.38% under Si0 level,respectively,and reduced by 10.52%,5.71%,3.77% and 12.15% under Si1 level,respectively This finding suggested that elevated UVB radiation depressed net photosynthetic rate,transpiration rate and water use efficiency in barley leaves,increasing Si supply could alleviate the damage to net photosynthetic rate from elevated UVB radiation,but not to transpiration rate and stomatal conductivity This research will be helpful in further investigating the effect of Si supply on barley yield and quality under elevated UVB radiation.

Key words: UVB radiation, Silicon supply, Barley, Photosynthesis, Transpiration