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玛丽娅·奴尔兰,刘卫国,霍举颂,李宏侠,张雨,刘建国,徐悦.旱生芦苇对地下水位变化的生态响应及适应机制.生态学报,2018,(20).http://dx.doi.org/10.5846/stxb201711242104  
旱生芦苇对地下水位变化的生态响应及适应机制
Ecological response and adaptation mechanism of Phragmites australis to changes of groundwater level
投稿时间:2017-11-24  修订日期:2018-04-27
DOI: 10.5846/stxb201711242104
关键词旱生芦苇  地下水位  光合作用  渗透调节物质
Key WordsPhragmites australis  groundwater level  photosynthesis  osmotic adjustment substance
基金项目国家自然科学基金项目(31260112)
作者单位E-mail
玛丽娅·奴尔兰 新疆大学资源与环境科学学院
绿洲生态教育部重点实验室 
1072068131@qq.com 
刘卫国 新疆大学资源与环境科学学院
绿洲生态教育部重点实验室 
wgliuxj@126.com 
霍举颂 新疆大学资源与环境科学学院  
李宏侠 新疆大学资源与环境科学学院  
张雨 新疆大学资源与环境科学学院  
刘建国 新疆大学资源与环境科学学院  
徐悦 新疆大学资源与环境科学学院  
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摘要:
地下水作为干旱半干旱地区可利用水的主要存在形式,是影响植被生存的主要生态因子。本文通过人工模拟地下水位,探讨了旱生芦苇对不同地下水位的生态响应及适应机制。结果表明:(1)随地下水位的降低,旱生芦苇净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)和胞间CO2浓度(Ci)均呈先增后减的变化趋势,其生长季均呈单峰曲线,以7-8月为峰值;(2)旱生芦苇叶绿素(Chl)含量随地下水位的降低呈先增后减的动态变化;(3)旱生芦苇脯氨酸(Pro)、可溶性糖(SS)和可溶性蛋白质(SP)含量随地下水位及其生长季的变化规律不一致,但三者在抑制干旱胁迫过程中存在相互补偿的关系;(4)随地下水位的降低,丙二醛(MDA)含量呈先增后减的变化趋势,且随生长季变化增加显著;超氧化物歧化酶(SOD)和过氧化氢酶(CAT)活性增加显著,且SOD比CAT对干旱胁迫反应更敏感,是适应干旱胁迫的主要抗氧化酶;(5)旱生芦苇生理因子对Pn的重要性大小顺序为Gs>SP>Chl>Tr>Ci>SS。
Abstract:
Groundwater, as the main form of available water in arid and semi-arid areas, is the primary ecological factor affecting the survival of vegetation. In this paper, the ecological response and adaptive mechanism of Phragmites australis under different groundwater levels were discussed using artificial simulation of groundwater levels. The results showed that with a decrease in groundwater level: (1) Net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs), and intercellular CO2 concentration (Ci) tended to increase first and then decrease, and the growth season exhibited a single peaked curve, which peaked from July to August; (2) Chlorophyll (Chl) content increased first and then decreased; (3) The change in proline (Pro), soluble sugar (SS), and soluble protein (SP) content, the osmolytes of cells in P. Australis, was inconsistent with the variation in groundwater levels and the growing season, but there was a mutual compensation relationship among them in the process of inhibiting drought stress; (4) Malon dialdehyde (MDA) content exhibited a trend of first increasing and then decreasing, and the growth season was significantly increased; superoxide (SOD) and catalase (CAT) activity increased significantly; and SOD was more sensitive than CAT to drought stress, which is the main antioxidant enzyme that adapts to drought stress; (5) For P. Australis, the order of importance of its physiology factors to Pn was Gs > SP > Chl > Tr > Ci > SS.
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