直播羊草在不同pH土壤环境下的生物学特性和生理反应

生态学杂志

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-hua^1,2,3;LIANG Zheng-wei^1,4;MA Hong-yuan^1,3;YAN Chao^1,3

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/Abstract

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

黄立华;梁正伟^1,4;马红媛;闫超 . 直播羊草在不同pH土壤环境下的生物学特性和生理反应[J]. 生态学杂志.

HUANG Li-hua^1,2,3;LIANG Zheng-wei^1,4;MA Hong-yuan^1,3;YAN Chao^1,3. Biological characteristics and physiological responses of Leymus chinensis seeded in soils with different pH. [J]. cje.

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