| 氮沉降对臭氧胁迫下青杨光合特性和生物量的影响 |
| 摘要点击 2759 全文点击 1213 投稿时间：2016-03-25 修订日期：2016-04-26 |
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| 中文关键词 臭氧 氮沉降 青杨 光合特性 生物量 |
| 英文关键词 ozone nitrogen deposition Populus cathayana photosynthetic characteristics biomass |
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| 中文摘要 |
| 基于开顶式气室 臭氧（O3）熏蒸装置，研究了人工模拟氮沉降 对O3胁迫下青杨光合特性的影响.结果表明，随着O3浓度的升高，净光合速率（Pn）、电子传递速率（ETR）、PSⅡ反应中心激发能捕获效率（F' v/F'm）、光化学猝灭系数（qP）、最大羧化速率（Vcmax）和最大电子传递速率（Jmax）显著降低，胞间CO2浓度（ci）显著升高，但气孔导度（Gs）变化不显著，生长季末期生物量也显著下降.而氮沉降在一定程度上提高了青杨的光合能力以及生物量.与单一O3、氮沉降相比，两者交互作用并未显著影响植物光合特性.该研究结果为应对全球变化背景下青杨的防护提供科学依据. |
| 英文摘要 |
| The open top chambers were used to explore the influences of nitrogen deposition on the response of photosynthetic characteristics of Populus cathayana to ozone. The results showed that the net photosynthetic rate (Pn), apparent electron transport rate (ETR), excitation energy capture efficiency of PSⅡ reaction center (F'v/F'm), coefficient of photochemical quenching (qP), the maximum of carboxylation efficiency (Vcmax) and the maximum rate of electron transport (Jmax) were significantly decreased with the increasing O3 concentration. However, intercellular CO2 concentration (ci) was significantly increased and stomatal conductance (Gs) remained unchanged. There was significant difference in biomass at the end of growing season. However, in a certain extent, nitrogen deposition improved photosynthetic capacity and biomass of P. cathayana. The interaction of O3 and nitrogen deposition was not significant in terms of plant photosynthetic characteristics. The current results provided scientific basis for the protection of P. cathayana in response to the global O3 concentration and nitrogen deposition increase. |
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