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中国农学通报

中国农学通报 ›› 2012, Vol. 28 ›› Issue (6): 47-52.

所属专题： 油料作物； 农业气象

• 农学 农业基础科学 • 上一篇    下一篇

自由大气CO2浓度升高对夏大豆光合色素含量和光合作用的影响

高霁   

  • 收稿日期:2011-08-09 修回日期:2011-12-23 出版日期:2012-02-25 发布日期:2012-02-25
  • 基金资助:

    中澳政府气候变化合作项目 (00xx－0506-Norton)，国家科技支撑计划课题 (2007BAC03A06) 和农业部农业环境与气候变化重点开放实验室开放基金项目资助

Effect of Elevated [CO2] on Photosynthetic Pigment Contents and Photosynthesis of Summer Soybean

  • Received:2011-08-09 Revised:2011-12-23 Online:2012-02-25 Published:2012-02-25

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摘要：

研究大气CO2浓度升高对大豆光合指标的影响，有助于了解未来气候变化后大豆光合生理的变化。利用开放式自由大气CO2浓度富集系统(Free Air CO2 Enrichment)在高CO2浓度（550±60 μmol/mol左右）和对照大气CO2浓度（平均389±40 μmol/mol左右）及2种施氮水平下种植‘中黄35’和‘中黄13’大豆品种，测定了2个大豆品种的叶绿素、类胡萝卜素含量及光合作用的变化。结果表明：CO2浓度升高对大豆功能叶光合色素含量的影响存在品种差异，初花期‘中黄13’光合色素含量变化不显著，但在盛荚期光合色素显著下降，且在低肥处理下更明显，对‘中黄35’没有影响。大气CO2浓度升高后，2个品种大豆净光合速率均明显升高，气孔导度下降。大豆净光合速率提高将促使作物积累更多的有机物，有利于作物生物量和产量的提高。气孔导度下降可能会使作物蒸腾作用减弱，有利于作物水分利用率的提高。

关键词: 环境敏感指数, 环境敏感指数, 环境适应指数, 环境脆弱指数, 主成分分析, 铜川市

Abstract:

Research on photosynthesis parameter of summer soybean response to elevated [CO2] could help to learn about photosynthesis physiological changes of summer soybean under future Climate Change. The objective of this study was to investigate the effect of elevated (550±60 mmol/mol) [CO2] on photosynthetic pigment contents, photosynthesis of two soybean cultivars (‘Zhonghuang13’ and ‘Zhonghuang35’) with two nitrogen levels at the Free-Air Carbon dioxide Enrichment (FACE) experimental facility. The results showed that the reaction of photosynthetic pigment contents including chlorophyll a, chlorophyll b, total chlorophyll contents and carotenoid contents of soybean to high CO2 levels was difference for the two soybeans. It was not changed for ‘Zhonghuang35’ in flowering and pod period but reduced for ‘Zhonghuang13’ in pod period. The photosynthetic rates (Pn) of the two cultivars soybean were increased and the stomatal conductance was decreased with the high CO2 level. Pn increase could help soybean to better use the light, accumulate more organisms and increase the biomass and yield. The stomatal conductance decrease might reduce the soybean transpiration (Tr), which could promote the water use effect (WUE) of the soybean.