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在全球森林生态系统中,夜间土壤呼吸率普遍高于白天
Heng Huang1,2, Jinyun Tang3, Ben Bond-Lamberty4
1School of Ecology, Shenzhen Campus of Sun Yat-Sen University, Shenzhen, Guangdong, China.
Global change biology
|March 14, 2026
概括
在森林中,土壤呼吸 (Rs) 在夜间比白天更高,这与模型假设相反. 这一发现对于理解土壤碳预算和气候变化影响至关重要.
科学领域:
- 陆地生态系统生态学 地球生态系统生态学
- 生物地质化学循环的过程
- 气候变化科学 气候变化科学
背景情况:
- 土壤呼吸 (Rs) 是一个主要的陆地碳流,影响土壤碳预算.
- 季节性和年度Rs动态和温度灵敏度是可以理解的,但diel (24小时) 模式是不能理解的.
- 地球系统模型 (ESM) 常常假设在日周期中恒定的Rs温度响应,预测较低的夜间Rs.
研究的目的:
- 调查全球森林生态系统中土壤呼吸 (Rs) 的 diel 模式.
- 为了比较观察到的 diel Rs 模式与来自地球系统模型 (ESM) 的预测.
- 评估 diel Rs 动态对碳气候反的影响.
主要方法:
- 分析了来自36个全球森林遗址的广泛的现场Rs数据集.
- 日间和夜间Rs-温度关系的比较.
- 对ESM预测与观察到的 diel Rs模式进行评估.
主要成果:
- 在36个森林遗址中观察到一个普遍的模式,夜间高于白天的Rs.
- 这种模式很可能是由光合作用和Rs之间由于光合作用运输的时间滞后驱动的.
- 在31个地点,日间Rs-温度关系低估了夜间Rs的2.5%28.7%.
- 由于低估了根呼吸动态,ESM不准确地预测了较低的夜间Rs.
结论:
- 森林生态系统中存在显著的DIEL Rs模式,夜间呼吸率较高.
- 温度响应的日程差异很大,目前的ESM无法捕捉到.
- 在全球变暖下,整合 diel Rs 动态对于改善碳气候反预测至关重要.
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