| 摘要: |
| 以巢湖水域三种优势挺水植物为材料, 研究了不同底质处理下植物光合生理特性的差异.结果表明, 三种挺水植物地上部生物量以香蒲最大, 芦苇次之, 菖蒲最小.香蒲的叶绿素a(Chl.a)、叶绿素b(Chl.b)和类胡萝卜素(Car)含量、气孔导度、胞间CO2浓度、蒸腾速率均显著大于芦苇和菖蒲, 光合速率、Fv/Fm和ΦPSⅡ显著高于菖蒲.相关性分析表明, 地上部分生物量的变化与光合速率呈显著正相关.净光合速率与气孔导度、胞间CO2浓度均呈显著正相关关系.因此, 较大的气孔导度、较高的光合色素含量以及Fv/Fm和ΦPSⅡ, 是香蒲之所以具有较高净光合速率和生物量的重要机制.四种底质改良方式(划耕、有机质、客土和加沙)均能不同程度地提高植物叶片的光合色素含量(Chl.a、Chl.b、Car和Chl.a/Chl.b)和光化学反应中心活性(Fv/Fm和ΦPSⅡ), 增加气孔导度和胞间CO2浓度, 从而提高光合速率并最终促进植物的生长.其中, 以划耕和有机质处理的效果最为显著。 |
| 关键词: 挺水植物 底质 气体交换 光合色素 叶绿素荧光 |
| DOI：10.18307/2011.0408 |
| 分类号: |
| 基金项目:国家水体污染控制与治理科技重大专项(2008ZX07103-003);国家自然科学基金项目(50979102)联合资助 |
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| Effects of different sediment materials on photosynthetic characters of three emergent plant species |
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BAO Xianming1, FAN Chengxin2, SHI Gangrong1
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1.College of Life Sciences, Huaibei Normal University, Huaibei 235000, P.R.China;2.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P.R.China
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| Abstract: |
| To investigate the effects of sediment types on growth and photosynthetic characteristics in emergent plants,the leaf pig-ment contents,chlorophyll fluorescence and gas exchange of three dominant species(Phragmites communis,Typha minina and Acorus calamus) from aquatic vegetation of Lake Chaohu,which were grown in five different sediment types,were examined.The results showed that in the three emergent plant species, the shoot biomass was highest in T.minina, followed by P.communis, and the lowest in A.calamus.The chlorophyll-a content(Chl.a),chlorophyll-b content(Chl.b),carotenoid content(Car),stomatal conductance,intercellular CO2 concentration,transpiration rate in T.minina were significantly higher than that in A.calamus and in P.communis,net photosynthetic rate,Fv/Fm and ΦPS Ⅱ in T.minina were significantly higher than that in A.calamus.Ac-cording to correlation analysis,the shoot biomass was positively correlated to net photosynthetic rate,while net photosynthetic rate was significantly correlated to stomatal conductance and intercellular CO2 concentration.Therefore,the results indicated that the high stomatal conductance,pigment content,as well as Fv/Fm and ΦPS Ⅱ in T.minina plants might lead to the high shoot bio-mass and net photosynthetic rate.Compared to the control(the original sediment),using the four sediment treatments(loosen sedi-ments,organic sediments coverage,soil sediments coverage and sand sediments coverage) in varying degrees have increased pig-ment contents(Chl.a,Chl.b,Car and Chl.a/Chl.b),improved the activity of reaction center(Fv/Fm and ΦPS Ⅱ),and en-hanced stomatal conductance and intercellular CO2 concentration.As a result,the sediments enhanced photosynthetic rate and plant growth,and the loosen sediments and organic sediments coverage had high effects among the four treatments. |
| Key words: Emergent plants sediment gas exchange pigment contents chlorophyll fluorescence |
