植物生态学报 ›› 2024, Vol. 48 ›› Issue (5): 623-637.DOI: 10.17521/cjpe.2023.0127  cstr: 32100.14.cjpe.2023.0127

• 研究论文 • 上一篇    下一篇

环境胁迫影响三峡库区消落带草本和木本植物生理生态特征的meta分析

邓蓓, 王晓锋, 廖君*()   

  1. 山区生态系统碳循环与碳调控重庆市重点实验室, 三峡库区地表生态过程重庆市野外科学观测研究站, 重庆师范大学地理与旅游学院, 重庆 401331
  • 收稿日期:2023-05-08 接受日期:2023-10-09 出版日期:2024-05-20 发布日期:2023-10-10
  • 通讯作者: (junliao@cqnu.edu.cn)
  • 基金资助:
    重庆市教育委员会科学技术研究项目(KJQN202200534);重庆市博士“直通车”科研项目(CSTB2022BSXM-JCX0146)

Ecophysiological responses of herbaceous and woody plants to environmental stresses in the riparian zone of Three Gorges Reservoir: a meta-analysis

DENG Bei, WANG Xiao-Feng, LIAO Jun*()   

  1. Chongqing Key Laboratory of Carbon Cycling and Carbon Regulation in Mountainous Ecosystems, Chongqing Field Observation and Research Station of Earth Surface Ecological Processes in Three Gorges Reservoir Area, College of Geography and Tourism, Chongqing Normal University, Chongqing 401331, China
  • Received:2023-05-08 Accepted:2023-10-09 Online:2024-05-20 Published:2023-10-10
  • Contact: (junliao@cqnu.edu.cn)
  • Supported by:
    Science and Technology Research Program of Chongqing Municipal Education Commission(KJQN202200534);Doctoral “Direct Train” Project of Chongqing(CSTB2022BSXM-JCX0146)

摘要:

三峡库区消落带适生草本与木本植物对环境胁迫的响应是生态系统结构与功能演变的重要机制。然而, 目前对消落带胁迫环境下草本和木本植物的响应特征及是否存在类群差异尚不清楚。该研究基于meta分析, 探讨了三峡消落带典型环境胁迫(水淹、干旱胁迫)对适生草本和木本植物生理生态特征的影响, 从物种和生活型的角度揭示了消落带适生植物类群对水淹、干旱胁迫的响应规律。结果表明: (1)草本植物和木本植物在环境胁迫下均表现出明显的生长发育抑制以及生理生化策略的适应性响应, 主要表现在各组织器官生物量、光合速率的下降, 丙二醛和脯氨酸含量的增加, 以及抗氧化酶(超氧化物歧化酶、过氧化物酶、过氧化氢酶)活性增强。(2)水淹胁迫对草本植物生物量负效应最强, 干旱胁迫次之; 水淹胁迫对木本植物总叶绿素含量和光合速率负效应最大, 干旱胁迫次之, 表现出环境胁迫作用的生活型效应; 但草本与木本植物的总叶绿素含量均对水淹胁迫响应最敏感, 而木本植物对干旱胁迫表现出一定的内稳态。木本植物在生理生化方面对水淹胁迫的响应比草本植物更显著, 且主要体现在气孔导度、丙二醛含量、脯氨酸含量和过氧化物酶活性方面的响应与草本植物存在差异; 而草本植物对干旱胁迫的响应比木本植物更显著, 主要表现为总叶绿素含量、水分利用效率、抗氧化酶(超氧化物歧化酶、过氧化物酶、过氧化氢酶)活性方面的响应与木本植物存在差异。(3)草本和木本植物对不同环境胁迫的形态响应具有组织特异性差异。草本植物主要以根部、茎部和叶片形态的变化适应水淹和干旱胁迫, 木本植物则主要以根部形态的变化为主。

关键词: 三峡库区, 植物, 生理生态, 环境胁迫, meta分析

Abstract:

Aims The response of herbaceous and woody plants to environmental stress is an important mechanism for the evolution of ecosystem structure and function in hydro-fluctuation belt of Three Gorges Reservoir. However, the pertinent response characteristics and whether there are group differences in these stress responses are still unclear.

Methods Here, we undertook a meta-analysis of the effects of typical environmental stresses (flooding and drought stress) on the physiological and ecological characteristics of suitable herbaceous and woody plants in the Three Gorges hydro-fluctuation belt, with an aim to reveal the response of suitable plant groups to flooding and drought stress from the perspective of species and life forms.

Important findings The results showed that: (1) Herbaceous plants and woody plants showed obvious growth and development inhibition and adaptive response in physiological and biochemical strategies under environmental stress, mainly manifested in the decrease of biomass and photosynthetic rate of each tissue and organ, the increase of malondialdehyde and proline content, and the initiation of antioxidant enzyme system (superoxide dismutase, peroxidase, catalase). (2) Flooding stress had the strongest negative effect on herbaceous plant biomass, followed by drought stress. Flooding stress had the greatest negative effect on total chlorophyll content and photosynthetic rate of woody plants, followed by drought stress, showing the life-form effect of environmental stress. However, the total chlorophyll content of herbaceous and woody plants was most sensitive to flooding stress, while woody plants showed a certain homeostasis to drought stress. The physiological and biochemical responses of woody plants to flooding stress were more significant than those of herbaceous plants, and the responses were mainly different from those of herbaceous plants in stomatal conductance, malondialdehyde and proline content, and peroxidase activity. The herbaceous plants showed stronger response to drought stress than did woody plants, and the response of total chlorophyll content, water use efficiency and antioxidant enzyme (superoxide dismutase, peroxidase, catalase) activity was different from that of woody plants. (3) The morphological responses of herbaceous and woody plants to different environmental stresses have tissue-specific differences. Herbaceous plants mainly adapt to flooding and drought stress by morphological changes of roots, stems and leaves, while woody plants mainly adapt via morphological changes of roots. In summary, this study presents an integrated view of the morphological and physiological characteristics of herbaceous and woody plants in response to environmental stress in the hydro-fluctuation belt of the Three Gorges Reservoir, which provided a scientific basis for evaluating the potential of different life-form vegetation in the ecological structure and functional restoration in this ecologically-important region.

Key words: Three Gorges Reservoir, plant, physiological ecology, environmental stress, meta-analysis