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由大气CO2观测所揭示的生态系统呼吸的生物规模温度敏感性
Wu Sun1, Xiangzhong Luo2,3,4, Yuanyuan Fang5
1Department of Global Ecology, Carnegie Institution for Science, Stanford, CA, USA. wsun@carnegiescience.edu.
Nature ecology & evolution
|June 15, 2023
概括
生态系统的呼吸呼吸系统
科学领域:
- 地球系统科学 地球系统科学
- 生态生态学 生态生态学
- 气候科学 气候科学
背景情况:
- 生态系统呼吸的温度敏感性对于理解陆地碳汇对气候变暖的反应至关重要.
- 对这种灵敏度的观测约束是有限的,特别是在更大的尺度上.
- 现有的图片规模研究报告的温度灵敏度高于在生物体规模观察到的.
研究的目的:
- 通过使用观测数据和生物圈模型,描述北美生物体中生态系统呼吸的温度敏感性.
- 为了将生物体规模的温度灵敏度与图片规模的估计进行比较.
- 评估温度灵敏度对陆地生物圈模型准确性的影响.
主要方法:
- 利用了来自观测塔网络的大气二氧化碳度数据.
- 综合碳流量估计来自先进的陆地生物圈模型.
- 推断的阿雷尼乌斯激活能量来表示生物体尺度上的温度灵敏度.
主要成果:
- 衍生生物体规模激活能量范围从0.38到0.53 eV,北美总体估计为0.43 eV.
- 与图片规模研究相比,在生物体规模上观察到显著较低的温度灵敏度 (约. 0.65 eV) 的电流.
- 证明调整模型温度灵敏度可以改善观察到的大气二氧化碳变量的表示.
结论:
- 生态系统呼吸的生物体规模温度敏感性低于以前从图片规模研究中估计的.
- 空间规模和生物群特异性是影响温度敏感性的关键因素.
- 研究结果强调,需要进一步研究大规模碳汇在气候变暖下的弹性.
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