欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志

• 研究报告 • 上一篇    下一篇

三种冷季型草坪草对高浓度O3的生理响应

赵诣1,2,徐胜1**,何兴元1,陈玮1,李梅1,3,张娜1,2,付伟4   

  1. 1森林与土壤生态国家重点实验室, 中国科学院沈阳应用生态研究所, 沈阳 110016; 2中国科学院大学, 北京 100049,
    3辽宁师范大学生命与科学学院, 辽宁大连 116033; 4西南林业大学园林学院, 昆明 650224)
  • 出版日期:2014-12-10 发布日期:2014-12-10

Physiological responses of three cool-season types of turfgrass to elevated O3 concentrations.

ZHAO Yi1,2, XU Sheng1**, HE Xing-yuan1, CHEN Wei1, LI Mei1, 3, ZHANG Na1,2, FU Wei4   

  1. (1State Key Laboratory of Forest and Soil Ecology, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 2University of Chinese Academy of Sciences, Beijing 100049, China; 3School of Life Science, Liaoning Normal University, Dalian 116033, Liaoning, China; 4 Faculty of Landscape Architecture, Southwest Forestry University, Kunming 650224, China)
  • Online:2014-12-10 Published:2014-12-10

摘要:

以3种常见冷季型草坪草——白三叶(Trifolium repens)、草地早熟禾(Poa pratensis)和苇状羊茅(Festuca arundinacea)为实验材料,利用开顶箱(OTC)模拟法,研究了这些草坪草在高浓度O3 (80和120 nmol·mol-1) 处理下生理生态指标的变化。结果表明:3种草坪草随O3胁迫加剧,呈现不同的伤害症状,其中,白三叶在熏蒸前期最先出现黄褐色点状伤斑。高浓度O3显著抑制了3种草坪草植株的生长。与对照相比,高浓度O3处理下显著提高了3种草坪草叶片中丙二醛(MDA)含量及SOD活性(88%、74%、47%)与POD活性(136%、5%、9%)(P<0.05)。草地早熟禾与苇状羊茅的脱落酸(ABA)含量随O3浓度升高而升高,而白三叶的ABA含量则呈现出先升高后降低的趋势。研究表明:白三叶对高浓度O3最为敏感,可用于做臭氧的指示植物;苇状羊茅对O3的敏感性最低,抗性最强。
 

关键词: 重力模型, 自然保护区, 最小耗费距离模型, 生态网络

Abstract:

An experiment was conducted to study the variations of the physiological indexes in leaves of Trifolium repens, Poa pratensis and Festuca arundinacea exposed to elevated O3 concentrations (80 and 120 nmol·mol-1) in open top chambers (OTCS). The results showed that three turfgrass species showed different injury symptoms induced by O3 stress, while brown injury spots appeared on T. repens first. Elevated O3 significantly inhibited the growth of the three grass species and significantly increased the content of malondialdehyde (MDA) and the activities of superoxide dismutase (SOD) and peroxidase (POD) (P<0.05). Elevated O3 significantly increased the content of abscisic acid (ABA) in leaves of P. pratensis and F. arundinacea, while T. repens showed a decreasing trend after an initial increase. The results showed that T. repens is most sensitive to high concentrations of O3 while F. arundinacea least.
 

Key words: nature reserve, gravity model, minimum cumulative resistance model, ecological network