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±60μmol/mol左右)和对照大气CO2浓度(平均389±40μmol/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。
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.
出处
《中国农学通报》
CSCD
2012年第6期47-52,共6页
Chinese Agricultural Science Bulletin
基金
中英合作项目"中国农业对气候变化脆弱性及适应能力建设"(H5105001)
国家重点基础研究发展计划项目(973计划)(2012CB955904)
中央公益型科研院所基本科研业务费专项资金
关键词
气候变化
CO2浓度
夏大豆
光合色素
光合作用
climate change
[CO2]
summer soybean
photosynthetic pigment contents
photosynthesis
