大气CO2浓度升高对茶树光合生理特性的影响

doi:10.13305/j.cnki.jts.2005.01.008

摘要/Abstract

摘要： 通过对不同大气CO₂浓度水平下的茶树观测试验,研究了大气CO₂增长对茶树新梢叶片净光合速率、蒸腾气孔导度、水分利用效率、叶绿素含量和营养元素含量等光合生理特性的影响。结果表明,在大气CO₂浓度为550、750βμmol·mol^-1时,比正常大气CO₂水平下茶树叶片日平均净光合速率提高17.9%和25.8%,并缓解和消除了光合午休现象;茶树叶片气孔导度降低7.6%和13.0%,蒸腾速度稍有下降,水分利用效率提高21.6%和35.8%;同时使茶树新梢叶绿素a、叶绿素b、叶绿素总量和类胡萝卜素含量分别提高12.8%~18.4% 、14.0%~22.0%、13.1%~19.4%和17.2%~20.1%,但叶绿素a与叶绿素b的比值有所降低。大气CO₂浓度的升高使新梢营养元素N、K、Ca含量有不同程度降低,而Mg、Fe、Zn、Mn、Cu含量有所增加。

关键词: CO₂升高, 茶树, 净光合速率, 气孔导度, 叶绿素

Abstract: The net photosynthesis(Pn), transpiration(Tr), stomatal conductance(Sc), water use efficiencyβ(WUE), chlorophyll contents and nutrient elements content of tea plant under ambient and elevated CO₂ conditions were measured, and responses to elevated CO₂ were discussed. The results showed that Pn increased by 17.9% and 25.8% under elevated (550 and 750μmol·mol^-1)CO₂, compared to the ambient air CO₂ concentration. At the same time, midday depression of photosynthesis abated or disappeared. Sc reduced by 7.6% and 13.0% and Tr decreased slightly. WUE increased by 21.6% and 35.8%. It was also found that chlorophyll a, chlorophyll b, total chlorophyll and carotennoid contents increased by 12.8%~18.4%, 14.0%~22.0%, 13.1%~19.4% and 17.2%~20.1% in shoots of tea plant. However, the ratio of chlorophyll a to b reduced. The N, K, and Ca contents in shoots decreased to some extent. The Mg, Fe, Zn, Mn and Cu contents increased with CO₂ enrichment.

Key words: Eleveted CO₂, Tea plant, Net photosynthesis, Stomatal conductance, Chlorophyll

中图分类号:

蒋跃林, 张仕定, 张庆国. 大气CO₂浓度升高对茶树光合生理特性的影响[J]. 茶叶科学, 2005, 25(1): 43-48. doi: 10.13305/j.cnki.jts.2005.01.008.

JIANG Yue-lin, ZHANG Shi-ding, ZHANG Qing-guo. Effects of Elevated Atmospheric CO₂ Concentration on Photo-physiological Characteristics of Tea Plant[J]. Journal of Tea Science, 2005, 25(1): 43-48. doi: 10.13305/j.cnki.jts.2005.01.008.

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大气CO₂浓度升高对茶树光合生理特性的影响

Effects of Elevated Atmospheric CO₂ Concentration on Photo-physiological Characteristics of Tea Plant

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