| 摘要: |
| 【目的】探讨不同程度涝渍胁迫对桢楠幼树光合生理及生长的影响，为桢楠苗圃水分管理及造林地的选择提供理论依据。【方法】以3年生桢楠幼树为研究对象，进行盆栽渍水处理，试验共设对照（CK）、轻度渍水（H5）、中度渍水（H10）、重度渍水（H15）和完全渍水（H20）5个处理，在处理第51 天（H20处理叶片出现萎蔫）时，测定桢楠幼树的生长和光合生理指标。【结果】(1)渍水胁迫显著抑制了桢楠幼树的生长(P＜0.05)，随着渍水程度的加剧，H5、H10、H15、H20处理桢楠幼树株高净生长量分别较对照降低了30.2%，76.7%，81.4%和90.7%；(2)桢楠幼树光合色素含量随渍水程度的加剧呈降低趋势；(3)随涝渍胁迫的加剧，桢楠幼树净光合速率（Pn）、气孔导度（Gs）和蒸腾速率（Tr）显著降低(P＜0.05)，但胞间CO2浓度（Ci）则表现为先降后升的趋势；(4)在低光照（光合有效辐射＜600 μmol/(m2·s)）或低CO2浓度(CO2浓度＜600 μmol/mol)条件下，轻度渍水对桢楠光合作用有一定的促进作用；(5)在强光照条件下，高温可抑制重度及以上渍水胁迫下桢楠幼树的光合作用。【结论】在桢楠的育苗及造林过程中，应避免在地下水水位过高的立地条件下进行栽植, 如果的确需要栽培，则必须采取排水措施。 |
| 关键词: 涝渍胁迫 桢楠 生长特性 光合生理 |
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| 基金项目:四川省“十三五”农作物育种攻关项目（2016NZ0098-10）；四川省教育厅重点项目（13ZA0246） |
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| Effects of waterlogging stress on growth and photosynthetic characteristics of Phoebe zhennan saplings |
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ZHOU Xin,HU Hongling,HU Tingxing,et al
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| Abstract: |
| 【Objective】This study investigated the effects of waterlogging stress on photosynthetic physiology and growth characteristics of Phoebe zhennan saplings to provide basis for strengthening the management of nursery water.【Method】With three-year P.zhennan saplings as the research object,the potted waterlogging experiment was conducted with five waterlogging treatments including CK (normal soil water content),H5 (water level 5 cm below soil surface),H10 (water level 10 cm below soil surface),H15 (water level 15 cm below soil surface) and H20 (water level 5 cm above soil surface).The growth and photosynthetic physiological indexes of saplings 51 days after waterlogging (leaf wilting observed in H20 treatment) were determined.【Result】(1) Waterlogging significantly inhibited the growth of plant height (P＜0.05) and the net growth of plant height with increased waterlogging stress was reduced by 30.2%,76.7%,81.4% and 90.7% compared with that of control.(2) The content of photosynthetic pigments decreased with the aggravation of waterlogging stress.(3) The net photosynthetic rate (Pn),stomatal conductance (Gs) and transpiration rate (Tr) decreased significantly with the aggravation of waterlogging stress(P＜0.05),and the intercellular CO2 concentration (Ci) decreased firstly and then increased.(4) Under low light (photosynthetically active radiation＜600 μmol/(m2·s)）or low CO2 concentration (＜600 μmol/mol),mild waterlogging had positive influence on photosynthesis of saplings.(5) Under high light conditions, high temperature inhibited the photosynthesis of saplings in severe waterlogging stress.【Conclusion】In the process of growing seedling and afforestation of P.zhennan,it should be avoided to plant on the site with high groundwater level unless drainage measures are taken. |
| Key words: waterlogging stress Phoebe zhennan growth characteristics photosynthetic physiology |
