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林业科学 ›› 2011, Vol. 47 ›› Issue (12): 158-164.doi: 10.11707/j.1001-7488.20111224

• 研究简报 • 上一篇    下一篇

水淹与干旱交替胁迫对湿地松幼苗光合与生长的影响

张晔, 李昌晓   

  1. 西南大学生命科学学院 三峡库区生态环境教育部重点实验室 重庆 400715
  • 收稿日期:2011-08-22 修回日期:2011-09-16 出版日期:2011-12-25 发布日期:2011-12-25
  • 通讯作者: 李昌晓

Effects of Submergence and Drought Alternation on Photosynthesis and Growth of Pinus elliottii Seedlings

Zhang Ye, Li Changxiao   

  1. Key Laboratory for the Eco-Environment of the Three Gorges Reservoir Region of Ministry of Education College of Life Sciences, Southwest University Chongqing 400715
  • Received:2011-08-22 Revised:2011-09-16 Online:2011-12-25 Published:2011-12-25

关键词: 水分胁迫, 湿地松幼苗, 光合特征, 生长特征, 三峡库区

Abstract:

To select suitable tree species for riparian revegetation in the Three Gorges Reservoir Area, three different kinds of water treatment simulating the riparian soil water changes were applied, including control (CK), continuous flooding (CF), and periodic flooding-drought (PF). Photosynthesis, biomass, growth and other related physio-ecological characteristics of Pinus elliottii seedlings were examined in this research. Results showed that water treatment could significantly influence photosynthesis, biomass and growth of P. elliottii seedlings. Net photosynthetic rate (Pn) and stomatal conductance (Gs) in CF and PF were significantly lower than those in CK, with a significant higher intercellular carbon dioxide concentration (Ci) in the two treatments than in CK. With extension of the treatment duration, there was a continuous increase in total biomass, root biomass, stem biomass, leaf biomass, plant height and base diameter of both CF and PF. In terms of the overall average value throughout the experimental period, no significant difference was found in total biomass, root biomass, stem biomass, plant height and base diameter between CF and PF; however, the parameters in both CF and PF were significantly lower than that of CK. The results verified that P. elliottii seedling was capable to tolerate water and drought stresses, and could be a candidate species for establishing riparian shelterbelt in the Three Gorges Reservoir Area.

Key words: water stress, Pinus elliottii seedlings, photosynthesis, growth characteristics, the Three Gorges Reservoir Area

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