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环境变化对干旱,寒冷,温带和热带地区土壤呼吸的影响
Mbezele Junior Yannick Ngaba1, Yves Uwiragiye2, Bin Hu3
1Center of Molecular Ecophysiology (CMEP), College of Resources and Environment, Southwest University, Chongqing 400715, China; Higher Technical Teacher' Training College of Ebolowa, University of Ebolowa (HTTTC), 886 Ebolowa, Cameroon.
The Science of the total environment
|September 1, 2024
概括
土壤呼吸 (Rs) 随着变暖,降水和丰富而增加,因气候区而异. 全球Rs估计范围为91-171 Pg C yr-1,突出显示气候变化.
科学领域:
- 环境科学 环境科学
- 生态生态学 生态生态学
- 气候变化研究 气候变化研究
背景情况:
- 土壤呼吸 (Rs) 是影响陆地碳循环的关键过程.
- 气候变化和 (N) 丰富在预测不同气候区的Rs反应方面带来了不确定性.
- 了解这些反应对于准确的全球碳预算评估至关重要.
研究的目的:
- 对全球变暖,降水量增加和丰富对土壤呼吸 (Rs) 的全球影响进行全面的元分析.
- 评估Rs对不同气候区和生态系统的反应如何变化.
- 为了建模全球Rs,并确定影响其速度的关键环境驱动因素.
主要方法:
- 综合了来自123项研究的数据,包括10,377项全球观测.
- 使用集体机器学习 (EML) 模拟的年度Rs与13个环境共变量.
- 使用1平方公里分辨率的全球Rs数据库 (1961-2022) 和10倍的交叉验证.
主要成果:
- 气候变暖增加了12% (热带),13% (干旱) 和16% (温带).
- 增加的降雨刺激了Rs的11% (热带) 和9% (温带).
- 在寒冷 (+6%) 和热带 (+5%) 地区的积量增加了Rs;全球Rs估计为91-171 Pg C yr-1.1.
结论:
- 对气候变化和丰富的Rs反应是特定于气候区的.
- 温度,降水和沉积是全球卢比的关键驱动因素.
- 准确评估全球变化对碳循环的影响,需要考虑区域气候变化.
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