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大气氮沉降对海北高寒草甸优势种叶片光合作用过程的影响

吕琳玉 张黎 刘利民 何洪林 闫霜 方华军 李英年

吕琳玉, 张黎, 刘利民, 何洪林, 闫霜, 方华军, 李英年. 大气氮沉降对海北高寒草甸优势种叶片光合作用过程的影响[J]. 环境科学研究, 2016, 29(11): 1617-1625.
引用本文: 吕琳玉, 张黎, 刘利民, 何洪林, 闫霜, 方华军, 李英年. 大气氮沉降对海北高寒草甸优势种叶片光合作用过程的影响[J]. 环境科学研究, 2016, 29(11): 1617-1625.
L Linyu, ZHANG Li, LIU Limin, HE Honglin, YAN Shuang, FANG Huajun, LI Yingnian. Effects of Atmospheric Nitrogen Deposition on Photosynthesis of Dominant Plant Species in the Haibei Alpine Meadow Ecosystem[J]. Research of Environmental Sciences, 2016, 29(11): 1617-1625.
Citation: L Linyu, ZHANG Li, LIU Limin, HE Honglin, YAN Shuang, FANG Huajun, LI Yingnian. Effects of Atmospheric Nitrogen Deposition on Photosynthesis of Dominant Plant Species in the Haibei Alpine Meadow Ecosystem[J]. Research of Environmental Sciences, 2016, 29(11): 1617-1625.

大气氮沉降对海北高寒草甸优势种叶片光合作用过程的影响

基金项目: 国家自然科学基金项目(31000235);国家自然科学基金重大项目(31290221);中国科学院先导专项项目(XDA05050600)

Effects of Atmospheric Nitrogen Deposition on Photosynthesis of Dominant Plant Species in the Haibei Alpine Meadow Ecosystem

  • 摘要: 为研究大气氮沉降对海北高寒草甸光合作用过程的影响,对不同施氮水平和氮沉降类型〔KNO3、(NH4)2SO4和NH4Cl〕下5个群落优势种叶片w(TN)、异针茅叶片光合参数和冠层LAI(叶面积指数)进行测定和分析,并利用Farquhar植物光合作用模型估算光合参数变化对GPP(总初级生产力)的可能影响,其中,氮沉降设置4个水平,即对照〔0 kg/(hm2·a)〕、低氮〔10 kg/(hm2·a)〕、中氮〔20 kg/(hm2·a)〕和高氮〔40 kg/(hm2·a)〕,均以N计.结果表明:除了施加(NH4)2SO4、低氮处理下甘肃棘豆叶片w(TN)显著增加9.4%以外,其他施氮水平和施氮类型对5个优势种叶片w(TN)均无显著影响.高氮处理下Vcmax25(25 ℃时最大羧化速率)、J25(25 ℃时电子传输速率)、TPU25(25 ℃时丙糖磷酸传输速率)和Rd25(25 ℃时暗呼吸速率)分别较对照处理高出38.6%、30.4%、27.8%和164.3%.氮添加后,Rd25的增加抵消了因Vcmax25增加引起的光合作用增强效果,使得整体上GPP的增加趋势不显著.不同施氮水平和施氮类型下海北高寒草甸群落优势种的LAI均未发生显著变化.研究显示,当大气氮沉降量低于40 kg/(hm2·a)时,氮沉降量的增加会促进海北高寒草甸植物叶片光合作用的反应速率,但对植物叶片w(TN)、LAI和GPP的影响并不显著.

     

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  • 收稿日期:  2016-03-31
  • 修回日期:  2016-06-30
  • 刊出日期:  2016-11-25

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