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相关概念视频

Global Climate Change01:50

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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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In mechanics, work is done on an object when the force acting on it displaces the object. In thermodynamics, work done on a system can be estimated when the system's volume changes during any thermodynamic process.
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The Net Change Theorem is a fundamental principle in calculus that establishes a direct relationship between a function’s rate of change and its accumulated change over an interval. Mathematically, it states that the definite integral of a function's derivative over a given interval [a,b] yields the net change in the original function:This theorem has significant applications in various real-world scenarios, including physics, economics, and engineering. A particularly useful application...
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Consistent with the law of mass action, an equilibrium stressed by a change in concentration will shift to re-establish equilibrium without any change in the value of the equilibrium constant, K. When an equilibrium shifts in response to a temperature change, however, it is re-established with a different relative composition that exhibits a different value for the equilibrium constant.
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生物对多维的全球变化非常脆弱.

Dexun Qiu1, Bo Xiao1,2, Tadeo Saez-Sandino3

  • 1Key Laboratory of Arable Land Conservation in North China, Ministry of Agriculture and Rural Affairs/College of Land Science and Technology, China Agricultural University, Beijing, China.

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概括

全球变化严重损害生物,影响土壤稳定性和营养循环. 添加和变暖导致生物覆盖和含量大幅下降,威胁生态系统功能.

关键词:
生物土壤地全球变化全球变化这是一个元分析.的沉积是的沉积.降水 降水 降水 降水 降水气候变暖导致的变暖

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科学领域:

  • 生态生态学 生态生态学
  • 全球变化生物学
  • 土壤科学 土壤科学

背景情况:

  • 生物土壤地 (生物地) 对于土壤的稳定性和营养循环至关重要,特别是在干旱地区.
  • 它们对全球变化压力因素的反应,如变暖,降水变化和添加等,尚不清楚.
  • 现有的数据主要来自小规模实验.

研究的目的:

  • 评估全球变化压力因素 (变暖,降水变化,添加) 对生物结构和功能特征的影响.
  • 通过元分析来综合现有研究,以了解广泛的反应.
  • 确定不同生物地类型,生态系统和气候区在脆弱性方面有何差异.

主要方法:

  • 进行了一项元分析,综合了来自38个网站的48个出版物的657个观察结果.
  • 分析了结构特征 (覆盖,物种丰富,生物量) 和功能特征 (叶绿素含量).
  • 评估了对变暖,降水变化,添加及其相互作用的反应.

主要成果:

  • 添加气导致生物覆盖率下降幅度最大 (-52%).
  • 气候变暖和降雨减少也大大减少了覆盖面,这些综合影响导致了更大的损失 (-44%).
  • 在降水量减少和添加下,叶绿素含量下降,但在降水量增加时增加.

结论:

  • 生物极易受到全球变化的影响,其覆盖面和功能明显下降.
  • 晚期顺序和蓝色细菌表现出不同的反应,前者更敏感.
  • 迫切需要采取保护措施来保护生物及其重要的生态系统服务.