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有证据表明,生态系统呼吸的广泛热优化
Weinan Chen1,2, Song Wang1,2, Jinsong Wang1
1Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, P. R. China.
Nature ecology & evolution
|July 24, 2023
概括
生态系统呼吸 (ER) 在全球生物群中具有最佳温度. 这种最佳温度广泛存在并适应每日最高温度,改善了气候变化预测.
科学领域:
- 地球和环境科学 地球和环境科学
- 生态生态学 生态生态学
- 气候科学 气候科学
背景情况:
- 生态系统呼吸 (ER) 是一个主要的生物圈-大气碳流.
- 预测气候变化对碳循环的影响需要了解ER的温度反应.
- 对于ER的最佳温度的存在和可变性仍然不太清楚.
研究的目的:
- 调查生态系统呼吸 (ER) 最佳温度的广泛存在.
- 为了确定这种最佳温度在不同的生物体和环境条件中是如何变化的.
- 评估ER的热适应性,以应对温度变化.
主要方法:
- 来自全球212个FLUXNET站点的ER温度响应曲线的分析.
- 统计检查最佳ER温度与各种生物/无生物因素之间的关系.
- 对ER和初级生产总值 (GPP) 的适应幅度的相关性分析.
主要成果:
- 在212个地点中,在183个地点观察到ER的抛物线温度响应曲线.
- 发现ER的最佳温度 ([公式:参见文本]) 在全球生物群中普遍存在.
- [公式:请参阅文本]与GPP的最佳温度和每年最大每日温度 (Tmax) 密切相关.
- [公式:参见文本]显示Tmax随着Tmax的线性增加,表明热适应.
- [公式:见文本]的适应大小与GPP的积极相关.
结论:
- 生态系统呼吸的最佳温度 ([公式:见文本]) 是全球常见的现象.
- 生态系统的呼吸表现出热适应,随着每日最大温度 (Tmax) 的增加[公式:参见文本].
- 将[公式:见文本]及其热适应纳入碳循环模型可以提高气候变化下的陆地碳捕获预测.
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