调控淹水对互花米草生理影响的研究

EFFECTS OF WATERLOGGING ON THE PHYSIOLOGY OF SPARTINA ALTERNIFLORA

调控淹水是控制入侵物种互花米草(Spartina alterniflora)的物理措施之一。本项实验应用盐度为8的淹水,研究了互花米草生长期间的相关生理和生长参数对0、25、50、75和100cm梯度淹水胁迫的响应。实验结果表明,互花米草在25cm淹水胁迫下,其株高、叶片中叶绿素a和叶绿素b含量均显著高于同期对照组(p<0.05);在50cm及以上的淹水胁迫下,互花米草的株高、叶片中叶绿素a和叶绿素b含量、可溶性糖含量均显著低于同期对照组(p<0.05),生长季末无开花结穗。研究表明,低水位(<50cm)淹水胁迫促进了其营养生长,对生殖生长无显著影响(p>0.05);而高水位(≥50cm)淹水胁迫能有效地抑制互花米草营养和生殖生长,是控制互花米草扩散的有效水位。

Controlled waterlogging has been suggested to be an effective measure to the invasive plant Spartina alterniflora. In this experiment, the responses of S. alterniflora during the growing season in terms of physiological and growth parameters to the gradient waterlogging of 0, 25, 50, 75 and 100 cm depths with 8 salt water were studied. The results showed that the height, the contents of chlorophyll a and b in leaves of the plants treated with 25 cm waterlogging were significantly higher than those of the control （P 〈 0.05）, while there was no significant difference in the sexual reproduction between the treatment and the control. The height and the contents of chlorophyll a, b and soluble sugar in leaves of the plants treated by ≥50 cm waterlogging were significantly lower than those of the control （P 〈 0.05）; and there was no any blossoming and fruit bearing for the treated plants. We concluded that waterlogging with low water depth （〈 50 cm） could promote vegetative growth of S. alterniflora, while waterlogging with water depth more that 50 cm could effectively inhibit the vegetative growth and sexual reproduction of the plant, being an effective water depth for controlling the expanding of S. alterniflora.