在全球变革驱动因素中,地面和地下生产力的脱稳定性
Ze Zhang1, Hongyan Liu1, Zidong Li1
1State Key Laboratory of Vegetation Structure, Function and Construction (VegLab), College of Urban and Environmental Sciences, Institute of Carbon Neutrality, Peking University, Beijing, China.
Global change biology
|December 26, 2025
概括
在环境变化下,草原的地下生产力比地面生产力更稳定. 这表明草原可能比以前认为的不那么脆弱,凸显了地下过程的重要性.
科学领域:
- 生态生态学 生态生态学
- 全球变化生物学
- 生态系统科学 生态系统科学
背景情况:
- 草原生态系统对于碳循环和生物多样性至关重要.
- 以前的研究往往忽视了地下生产力,可能高估了草原对环境变化的脆弱性.
- 地下与地面生产率对全球变化驱动因素的相对敏感性仍然不清楚.
研究的目的:
- 量化草原生产率,时间稳定性和碳分配对全球变化驱动因素的反应.
- 为了比较地面净初级生产率 (ANPP) 和地下净初级生产率 (BNPP) 在各种环境压力下的稳定性.
- 确定影响ANPP和BNPP稳定的关键驱动因素和生态系统特性.
主要方法:
- 综合了来自全球85个草原生态系统的113项研究中的1513个观察结果.
- 分析了九个全球变化驱动因素 (营养丰富,降水变化,高碳二氧化碳,变暖,割草,放牧) 的影响.
- 量化生产力,时间稳定性和碳分配模式.
主要成果:
- 地下净初级生产率 (BNPP) 稳定性与ANPP稳定性相比,对全球变化驱动因素的反应较弱.
- ANPP的稳定性与广泛的气候 (降水,干旱) 有关,而BNPP的稳定性与地表因素 (土壤水分,肥沃) 相相关.
- 地下碳分配影响了地面和地下的协调,并保持了BNPP的稳定性,这表明了生态系统的抵抗路径.
结论:
- 草原的脆弱性可能被高估了,因为人们专注于地面上的过程.
- 不同的驱动因素影响地面和地下的稳定性,挑战统一的响应理论.
- 了解地下动态对于预测全球环境变化下的草原生态系统稳定性至关重要.
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