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在全球范围内提高生态系统碳使用效率,通过机器学习和MODIS产品升级状共变率数据
M Campos-Taberner1, M A Gilabert2, S Sánchez-Ruiz2
1Environmental Remote Sensing group (UV-ERS), Universitat de València, Dr. Moliner, Burjassot, València, 46100, Spain. manuel.campos@uv.es.
Scientific reports
|December 24, 2025
概括
这项研究引入了一种新的方法来量化全球生态系统碳利用效率 (CUE),包括所有呼吸流. 结果显示全球平均CUE为0.43和下降趋势,突出显示气候变化影响.
科学领域:
- 生态生态学 生态生态学
- 环境科学 环境科学
- 气候科学 气候科学
背景情况:
- 碳利用效率 (CUE) 对于理解生态系统碳保留和碳循环至关重要.
- 传统的CUE评估往往忽略了异质性呼吸,提供了对生态系统碳动态的不完全看法.
- 需要一个整体的,生态系统层面的CUE量化来准确评估碳捕获.
研究的目的:
- 在全球范围内开发和应用一种方法来绘制生态系统级CUE的地图.
- 将所有呼吸道流 (自和异) 纳入全面的CUE评估中.
- 分析全球CUE趋势及其对2001年至2023年气候和生物群类型的依赖.
主要方法:
- 采用数据驱动的方法,结合了来自-协变塔和遥感观测 (MODIS) 的现场数据.
- 采用高斯过程回归 (GPR) 模型,使用基于塔的CUE数据进行训练,以提高估计.
- 生成了多时的全球CUE地图,并量化了相关的不确定性.
主要成果:
- 与实地数据相比,GPR模型显示出高准确性,R2 = 0.84,RMSE = 0.1,ME = 0.01.与实地数据相比,GPR模型显示出高准确性,R2 = 0.84,RMSE = 0.1,ME = 0.01.
- 在2001年至2023年期间报告的全球平均CUE为0.43±0.08.
- 在气候区 (热带到寒冷) 和生物群 (例如,常青宽叶森林与开放的灌木地) 中观察到CUE的显著变化.
- 发现了平均CUE的全球下降趋势为 (-1.2 ± 0.3) × 10−3 yr−1.
结论:
- 生态系统CUE受到气候和生物群类型的重大影响.
- 这项研究强调了一种令人担忧的全球趋势,即植物的碳捕获能力下降.
- 这些发现对于了解气候变化对陆地生态系统和全球碳循环的影响至关重要.
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