Differences in root aeration, iron plaque formation and waterlogging tolerance in six mangroves along a continues tidal gradient

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• 作者：Hao Cheng ; You-Shao Wang ; Jiao Fei ; Zhao-Yu Jiang ; Zhi-Hong Ye
• 关键词：Mangrove ; Root aeration ; Iron plaque ; Waterlogging
• 刊名：Ecotoxicology
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：24
• 期：7-8
• 页码：1659-1667
• 全文大小：909 KB
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• 作者单位：Hao Cheng (1)
  You-Shao Wang (1)
  Jiao Fei (1)
  Zhao-Yu Jiang (1)
  Zhi-Hong Ye (2)
  
  1. State Key Laboratory of Tropical Oceanography and Daya Bay Marine Biology Research Station, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China
  2. State Key Laboratory for Bio-control, School of Life Sciences, Sun Yat-sen University, Guangzhou, 510006, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  Ecology
  Environmental Management
  
• 出版者：Springer Netherlands
• ISSN：1573-3017

文摘

Mangrove is a special coastal forest along tropical and subtropical intertidal shores. However, how mangroves adapt to tidal flooding and the mechanisms involved in mangrove zonation are still poorly understood. In this study, a pot trial with different tide treatments was conducted to investigate the differences in root anatomy, porosity, radial oxygen loss, iron plaque formation and waterlogging tolerance among six mangroves along a continuous tidal gradient. The index of waterlogging tolerance illustrated that Sonneratia apetala possessed the highest index, followed by Aeguceras corniculatum/Kandelia, Rhizophora stylosa, Heritiera littorlis and Thespesia populnea. Waterlogging tolerances of the mangroves were found to be positively correlated with their root porosity, radial oxygen loss and iron plaque formation. Waterlogging-sensitive species such as landward semi-mangroves exhibited small root porosity and ROL, while waterlogging-tolerant species such as seaward pioneer and rhizophoraceous mangroves exhibited extensive porosity, ROL and iron plaque formation. Nevertheless, grater root porosity and iron plaque formation were detected in permanent waterlogged plants when compared to drained plants. In conclusion, The present study proposes a structural adaptive strategy to tidal flooding in mangroves, such that the mangroves with higher root porosity, ROL and iron plaque appeared to exhibit higher waterlogging tolerance and adaptability in anaerobic foreshores. Keywords Mangrove Root aeration Iron plaque Waterlogging