| 干旱胁迫对苏北沙质海岸3个树种水分光合生理特性的影响 |
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| 引用本文： | 徐世伟,胡海波,陈鑫,姚洋.干旱胁迫对苏北沙质海岸3个树种水分光合生理特性的影响[J].水土保持通报,2015,35(1):111-117. |
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| 作者姓名： | 徐世伟 胡海波 陈鑫 姚洋 |
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| 作者单位： | 南京林业大学南方现代林业协同创新中心 |
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| 基金项目： | 国家科技部项目“防侵蚀和防污染沿海防护林体系研究与示范”(2009BADB2B0601) |
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| 摘 要： | 目的]为了了解苏北沙质海岸3个造林树种的耐旱能力,为沿海防护林体系建设提供理论依据和技术支持。方法]通过盆栽苗木水分胁迫试验,着重分析了在水分胁迫条件下榉树、弗吉尼亚栎、女贞2a实生苗的水分生理和光合作用日变化特征。结果](1)随时间推移和胁迫程度加强,3个树种的叶片相对含水量均呈递减趋势,榉树的下降幅度高于女贞和弗吉尼亚栎;胁迫58d的重度水分胁迫处理下,3个树种相对含水量分别比对照下降了78.8%,61.9%和65.5%,弗吉尼亚栎和女贞的相对含水量变化较小;(2)3个树种叶片净光合速率日变化曲线在CK,60%和45%含水量条件下均呈双峰型;在正常和轻度水分胁迫下,弗吉尼亚栎蒸腾速率和气孔导度表现出双峰特征,而榉树和女贞则为:典型的单峰曲线;随着胁迫程度加强,3个树种的净光合速率、蒸腾速率、气孔导度和水分利用效率的日均值均为:CK60%含水量45%含水量30%含水量;同一水分条件下,4个指标的日均值呈现出:榉树女贞弗吉尼亚栎的规律。结论]3个树种的抗旱能力由强至弱依次为:弗吉尼亚栎女贞榉。沿海防护林的建设中应优先选择弗吉尼亚栎。
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| 关 键 词： | 干旱胁迫 光合特性 相对含水量 沙质海岸 |
| 收稿时间： | 2014/1/10 0:00:00 |
| 修稿时间： | 2014/1/20 0:00:00 |
Effects of Water Stress on Water Photosynthetic Physiology Characteristics of Three Tree Species in Sandy Shores of Northern Jiangsu Province |
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| XU Shiwei,HU Haibo,CHEN Xin and YAO Yang.Effects of Water Stress on Water Photosynthetic Physiology Characteristics of Three Tree Species in Sandy Shores of Northern Jiangsu Province[J].Bulletin of Soil and Water Conservation,2015,35(1):111-117. |
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| Authors: | XU Shiwei HU Haibo CHEN Xin and YAO Yang |
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| Institution: | XU Shiwei;HU Haibo;CHEN Xin;YAO Yang;Collaborative Innovation Center of the Southern Modern Forestry,Nanjing Forestry University; |
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| Abstract: | Objective] To study the drought tolerance of three afforestation trees on the sandy shores of Northern Jiangsu Province.Methods] Based on the experiment of water stress in pots, the index variation of water physiological characteristics and daily dynamics of photosynthetic characteristics of 2-year-old Zelkova schnideriana, Quercus virginiana and Ligustrum lucidum under water stress were analyzed.Results] (1) With time and stress intensity increasing, the relative water content in leaves of the three tree species all decreased, and the decreasing range of Zelkova schnideriana was bigger than that of Quercus virginiana and Ligustrum lucidum; water content of the three tree species decreased by 78.8%, 61.9% and 65.5% under severe water stress of 58 days, and the relative water contents of Quercus virginiana and Ligustrum lucidum changed a little. (2) Under treatments of CK, 60% and 45% water content, the diurnal curves of the photosynthetic rate of the three tree species were "double-peak". Under normal and light water stress, the diurnal curves of the transpiration rate and stomatal conductance of Quercus virginiana were "double-peak", while the same curves of Zelkova schnideriana and L igustrum lucidum were "single-peak". With increasing stress, the order of Pn, Tr, Gs and WUE of the three tree species was:CK>60% water content>45% water content>30% water content. In the same soil water grades, the daily averages of the four indexes of Zelkova schnideriana were relatively small, followed by Ligustrum lucidum, whereas those of Quercus virginiana were the largest.Conclusion] The drought tolerance characteristics of Zelkova schnideriana were relatively small, followed by Ligustrum lucidum, whereas those of Quercus virginiana were the largest. |
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| Keywords: | drought stress photosynthetic characteristics relative water content sandy shores |
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