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相关概念视频

Adaptations that Reduce Water Loss01:57

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Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
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During photosynthesis, plants acquire the necessary carbon dioxide and release the produced oxygen back into the atmosphere. Openings in the epidermis of plant leaves is the site of this exchange of gasses. A single opening is called a stoma—derived from the Greek word for “mouth.” Stomata open and close in response to a variety of environmental cues.
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Reliable Method for Assessing Seed Germination, Dormancy, and Mortality under Field Conditions
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全球种子休眠模式是由宏观气候驱动的,而不是火灾制度.

Sergey Rosbakh1,2, Angelino Carta3,4, Eduardo Fernández-Pascual5

  • 1Department of Plant and Environmental Sciences, University of Copenhagen, 1871, Frederiksberg, Denmark.

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种子休眠受气候的影响,不同种类在特定环境中壮成长. 宏观气候是一个关键因素,但其他全球驱动因素也影响着全球种子休眠模式.

关键词:
环境梯度的环境梯度.火的火的火的火的火宏观气候 宏观气候 宏观气候种子休眠状态 种子休眠状态种子的发芽 种子的发芽种子特征 种子特征 种子特征

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科学领域:

  • 生态生态学 生态生态学
  • 植物科学 植物科学
  • 宏观生态学 宏观生态学

背景情况:

  • 种子休眠期对于植物在可变环境中建立起关键作用.
  • 全球模式和种子休眠类 (生理学,形态生理学,物理) 的驱动因素仍然不完全理解.

研究的目的:

  • 在全球范围内调查种子休眠变化的宏观生态驱动因素.
  • 分析不同种子休眠类别的地理模式和环境相关性.

主要方法:

  • 利用了超过1万种种子休眠类的广泛数据集.
  • 我们将其与全球所有生物体的400多万个地理引用物种发生情况相结合.
  • 研究了气候和火灾制度对休眠分布的影响.

主要成果:

  • 种子休眠在季节性寒冷和干燥的气候中很普遍.
  • 生理休眠与干燥,温度季节性变化的气候 (例如草原) 有关.
  • 形态生理休眠在寒冷,潮湿,森林生物群中普遍存在.
  • 物理休眠与气候干燥相关,气温和降水的波动很大 (例如沙漠,沙漠).
  • 在稳定,温暖,潮湿的气候 (例如热带雨林) 中发现非休眠状态.
  • 消防制度没有显著影响种子休眠分布.
  • 环境驱动因素显示预测能力有限,这表明其他因素也参与其中.

结论:

  • 气候在很大程度上影响了种子休眠类型的全球分布.
  • 宏观气候是种子休眠的一个重要,但不是唯一的驱动因素.
  • 需要进一步的研究来确定种子休眠的其他全球驱动因素.