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直播羊草在不同pH土壤环境下的生物学特性和生理反应

黄立华1,2,3;梁正伟1,4;马红媛1,3;闫超1,3   

  1. 1中国科学院东北地理与农业生态研究所, 长春 130012;2吉林农业大学资源与环境学院, 长春 130118;3中国科学院研究生院, 北京 100039;4中国大安碱地生态试验站, 吉林大安 131317
  • 收稿日期:2007-09-07 修回日期:1900-01-01 出版日期:2008-07-10 发布日期:2008-07-10

Biological characteristics and physiological responses of Leymus chinensis seeded in soils with different pH.

HUANG Li-hua1,2,3;LIANG Zheng-wei1,4;MA Hong-yuan1,3;YAN Chao1,3   

  1. 1Northeast Institute of Geography and Agricultural Ecology, Chinese Aca
    demy of Sciences, Changchun 130012, China;2College of Resources and Environment, Jilin Agricultural University, Changchun 130118, China; 3Graduate University of Chinese Academy of Sciences, Beijing 100039, China; 4Da’an Sodic Land Experiment Station, Da’an 131317, Jilin, China
  • Received:2007-09-07 Revised:1900-01-01 Online:2008-07-10 Published:2008-07-10

摘要: 采用人工配制的不同pH梯度的碱化土进行盆栽试验,研究了直播羊草在不同pH土壤环境下的生物学特性和生理反应。结果表明:pH 8.50以下的弱碱性土壤环境有利于直播羊草的生长,但随着土壤pH的升高其分蘖和地上部生物量均呈下降趋势;当土壤pH达到978时,直播后第2年羊草总株数比对照(pH 7.15)降低了42.0%,地上部干质量比对照降低了74.1%。此外,在盐碱胁迫下,羊草地上部含水量、可溶性糖、叶绿素和K+含量亦呈下降趋势,Na+含量和叶片外渗液电导率显著升高,地上部K+/Na+比值从对照的28.5下降到1.6(pH 9.78),说明较高的K+水平以及较高的K+/Na+比值可能是羊草耐盐碱的重要生理机制。

关键词: 生活史, 种群调节, 免疫能力, 权衡

Abstract: Soils with different pH were artificially prepared by mixing various proportions of non-sodic and sodic soils, and pot experiment was conducted to investigate the biological characteristics and physiological responses of Leymus chinensis seeded in the prepared soils. The results showed that soil pH≤8.50 was beneficial to the growth of L. chinensis; when the pH was above >8.50, the tillering number and shoot dry mass had a decreasing trend; and when the pH was 9.78, the total plant number and shoot dry mass were decreased by 42.0% and 74.1%, respectively, compared with the control (pH=7.15). Under saline-alkali stress, the water content, soluble sugar content, chlorophyll content, and K+ concentration in shoot decreased, while the Na+ concentration and the conductivity of cytoplasmic membrane increased obviously. The K+/Na+ ratio in shoot decreased from 28.5 at pH 7.15 to 1.6 at pH 9.78. The higher concentration of K+ and higher ratio of K+/Na+ in shoot might be the main physiological mechanism of salinealkali tolerance of L. chinensis.

Key words: Life history, Population regulation, Immunocompetence, Trade-off