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生态学杂志 ›› 2021, Vol. 40 ›› Issue (3): 759-765.doi: 10.13292/j.1000-4890.202103.005

• 研究报告 • 上一篇    下一篇

内蒙古草甸草原地下芽库对极端干旱的响应

特尼乌1,3,郭子月2,刘丹2,雒文涛3,乌云娜4,阿如旱1,钱建强   

  1. 1内蒙古农业大学沙漠治理学院, 呼和浩特 010018; 2河南农业大学林学院, 郑州 450002;3中国科学院沈阳应用生态研究所, 沈阳 100016; 4大连民族大学环境与资源学院, 辽宁大连 116600)
  • 出版日期:2021-03-10 发布日期:2021-03-16

Responses of belowground bud bank to simulated extreme drought in the meadow steppe of Inner Mongolia.

Teniwu1,3, GUO Zi-yue2, LIU Dan2, LUO Wen-tao3, Wuyunna4, Aruhan1, QIAN Jian-qiang2*   

  1. (1College of Desert Control Science and Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China; 2College of Forestry, Henan Agricultural University, Zhengzhou 450002, China; 3Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 4College of Environment and Bioresources, Dalian Minzu University, Dalian 116600, Liaoning, China).
  • Online:2021-03-10 Published:2021-03-16

摘要: 全球变化引发的极端气候事件严重影响草地生态系统结构与功能。然而,作为多年生草地重要繁殖体库,半干旱草甸草原地下芽库如何响应极端干旱尚未明确。本研究以内蒙古呼伦贝尔草甸草原为对象,利用模拟极端干旱样地平台,探究地下芽库及其与地上植被关系对模拟生长季极端干旱的响应。结果表明,环境降水水平与干旱处理下总芽密度分别为1443和1128芽·m-2;分株总密度分别为1791和1346株·m-2;群落整体分生组织制约系数分别为0.84和0.83。极端干旱对草甸草原地下芽库、地上分株密度以及二者之间关联均无显著影响。就优势植物功能群根茎型禾草而言,极端干旱对其地下芽库同样无显著影响。因此,地下芽库表现出对极端干旱一定程度的抵抗力,可作为草甸草原植被应对极端气候事件的保险策略,有效促进草甸草原在极端气候胁迫下的种群更新与植被恢复,有助于草甸草原植被稳定性与生态系统功能维持。

关键词: 地下芽库, 植被恢复, 种群更新, 营养繁殖, 草甸草原, 气候变化

Abstract: The extreme climatic events caused by global changes have significant impacts on ecosystem structure and function of grasslands. As the important propagule bank in perennial grasslands, the responses of belowground bud bank to extreme drought in semiarid meadow steppe have not been clarified. In this study, using a simulated extreme drought experimental platform, we explored the responses of belowground bud bank, aboveground vegetation, and their relationships to simulated extreme drought during growing season in the Hulunbeir meadow steppe of Inner Mongolia. Results showed that under ambient precipitation and drought treatments, the total bud densities were 1443 and 1128 buds·m-2, the total shoot densities were 1791 and 1346 shoots·m-2, and the meristem limitation index were 0.84 and 0.83, respectively. The simulated extreme drought treatment had no significant effect on the belowground bud bank density, aboveground shoot density and their relationships at the community scale. For the dominant plant group, rhizomatous grasses, the extreme drought treatment did not affect their belowground bud banks. Our results demonstrated the resistance of belowground bud bank to extreme drought in semiarid meadow steppe. Belowground bud bank could be an insurance strategy of meadow steppe, and could facilitate plant regeneration and vegetation restoration under extreme climate, which is essential to vegetation stability and ecosystem function maintenance.

Key words: bud bank, vegetation restoration, population regeneration, vegetative reproduction, meadow grassland, climate change.