碳循环对中国陆地生态系统的气候变化反应:敏感性和驱动过程
Kewei Jiao1, Zhihua Liu1, Wenjuan Wang2
1CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Science, Shenyang 110016, China; Key Laboratory of Terrestrial Ecosystem Carbon Neutrality, Liaoning Province, Shenyang 110016, China.
The Science of the total environment
|January 15, 2024
概括
中国的陆地碳汇受生态系统生产和气候变化的影响. 变暖会对某些地区的产量产生负面影响,而降水量增加会加强碳汇,特别是在北部地区.
科学领域:
- 陆地生态系统科学 地球生态系统科学
- 气候变化研究 气候变化研究
- 碳循环动力学 碳循环动力学
背景情况:
- 了解陆地碳循环对气候变化的反应对于全球变化研究至关重要.
- 碳流,陆地水槽和气候变化影响之间的相互作用仍然不完全理解.
研究的目的:
- 探索中国的生态系统生产 (GPP/SIF/NDVI) 和生态系统碳净交换 (NEE) 之间的关系.
- 调查碳流对气候变化的敏感性,跨越各种时空尺度.
- 分析2000年以来中国气候驱动的碳循环过程.
主要方法:
- 使用了相关性和灵敏度分析.
- 集成各种数据:地面观测,遥感,大气逆转,机器学习和模型模拟.
主要成果:
- 干旱地区的生态系统净交换 (NEE) 主要是由生态系统生产驱动的.
- 气候变化对生态系统的生产影响比呼吸更大.
- 气候变暖对中国东北,亚热带和热带地区的生态系统生产产生了负面影响.
- 降水量增加增加了陆地碳汇,特别是在北方凉爽干燥的地区.
- 在中国南部,生态系统呼吸对气候变暖的敏感性更高.
- 生态系统生产对碳循环的控制从干旱地区减弱到潮湿地区.
- 确定了生产-呼吸转换的温度 (10.513.7°C) 和降水 (~1400毫米/年) 值.
结论:
- 生态系统生产是中国碳循环的关键驱动力,不同地区对气候因素的敏感性各不相同.
- 气候变化,特别是气候变暖和降雨变化,显著调节了中国的陆地碳汇.
- 在生产主导的碳循环和呼吸主导的碳循环之间存在过渡值.
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