| 摘要: |
| 【目的】研究干旱胁迫对西藏3种沙棘属植物光合荧光和生理生化特性的影响，为西藏干旱半干旱区造林树种的选择提供依据。【方法】以2年生云南沙棘（Hippophae rhamnoides subsp. Yunnanensis）、江孜沙棘（H. gyantsensis）和肋果沙棘（H. neurocarpa）苗木为材料，采用盆栽法，设持续干旱0，10，20，30 d处理，测定其光合荧光指标和生理生化指标，并对其抗旱性进行综合分析与评价。【结果】随着干旱胁迫时间的增加，3种沙棘属植物净光合速率、气孔导度、胞间CO2浓度、蒸腾速率、电子传递速率、实际光化学效率、有效光化学效率、叶片相对含水量、叶水势和SPAD值均呈不同程度的下降趋势，水分饱和亏缺、丙二醛、脯氨酸、过氧化物酶呈上升趋势；云南沙棘和肋果沙棘水分利用效率和羧化效率呈下降趋势，江孜沙棘水分利用效率和羧化效率分别呈倒“V”或“V”型变化；云南沙棘和肋果沙棘光化学猝灭系数呈下降趋势，江孜沙棘呈先下降后上升趋势；云南沙棘和江孜沙棘还原性糖含量呈倒“V”型变化，肋果沙棘呈下降趋势。采用隶属函数和主成分分析对3种沙棘属植物18个指标进行综合评价，评价结果表现一致。【结论】西藏3种沙棘属植物的抗旱能力依次表现为江孜沙棘＞肋果沙棘＞云南沙棘,江孜沙棘是西藏干旱半干旱地区造林的首选树种。 |
| 关键词: 沙棘 抗旱性评价 西藏 |
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| 基金项目:国家自然科学基金项目（31260049）；西藏自治区高校青年教师创新支持计划项目(QC2015-40)；“西藏高原林业生态工程重点实验室”建设项目（201210）；西藏农牧学院研究生创新计划项目(YJS2019-01) |
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| Comparison of drought resistance of three Hippophae species in Tibet |
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NAN Jibin,YANG Guanghuan,WU Tianyu,et al
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| Abstract: |
| 【Objective】The effects of drought stress on photosynthetic fluorescence and physiological and biochemical characteristics of three Hippophae species in Tibet were studied to provide basis for selection of afforestation tree species in arid and semi arid areas of Tibet.【Method】The 2-year-old seedlings of Hippophae rhamnoides subsp.Yunnanensis,H. gyantsensis,and H. neurocarpa were planted in pots with continuous droughts for 0,10,20,and 30 days.Changes in photosynthetic fluorescence and physiological and biochemical indexes were measured,and their drought resistance was comprehensively analyzed and evaluated.【Result】With the increase of drought stress time,photosynthetic rate, stomatal conductance,intercellular CO2 concentration,transpiration rate,electron transfer rate,actual photochemical efficiency,effective photochemical efficiency,relative water content,leaf water potential and SPAD value all decreased to varying degrees,while water saturation deficit,malondialdehyde,proline,and peroxidase increased.Water use efficiency and carboxylation efficiency of H.rhamnoides subsp.Yunnanensis and H.neurocarpa decreased,and those of H.gyantsensis showed inverted “V” and “V” type changes,respectively.Photochemical quenching coefficients of H.rhamnoides subsp.Yunnanensis and H.neurocarpa decreased,while that of H. gyantsensis declined first before increasing.The content of reducing sugar of H.rhamnoides subsp.Yunnanensis and H.gyantsensis showed an inverted “V”shape,while that of H.neurocarpa showed a downward trend.The membership function and principal component analysis showed consistent results in evaluating the 18 indicators of three Hippophae species.【Conclusion】The drought resistance of three tested Hipopophae species in Tibet was in the order of H.gyantsensis>H.neurocarpa>H.rhamnoides subsp.Yunnanensis,H.gyantsensis was the preferred tree species for afforestation in the arid and semi arid areas of Tibet. |
| Key words: Hippophae drought resistance evaluation Tibet |
