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在实验中与观测相比,草地生产力对降水的反应偏差取决于干旱度

Yumiao Xiao^1,2,3, Yun Jiang^2,4, Jiawei Li⁵

¹Guangdong Provincial Observation and Research Station for Coupled Human and Natural Systems in Land-Ocean Interaction Zone, Beijing Normal University, Zhuhai, China.

|September 5, 2025

概括

草原生态系统对降水变化的反应在实验和现实观察之间有所不同. 由于未模拟的环境因素,实验可能会低估干旱地区的效应,并在潮湿地区高估效应.

科学领域:

生态学
全球变化生物学
生态系统科学

背景情况:

降雨操纵实验是研究生态系统生产力反应的常见工具.
实验结果反映自然生态系统对降水变化的准确性是不确定的.
草原生态系统对水资源的变化特别敏感.

研究的目的:

进行全球现实检查,比较草原生态系统对实验数据和观测数据的降水变化的反应.
确定和解释地面净初级生产率 (ANPP) 对实验和自然环境中观察到的降水变化的敏感性.
评估实验设计对草原ANPP降雨影响的研究结果可靠性的影响.

主要方法:

从全球22个草原地区编制配对数据集,包括ANPP和降水的实验和观测测量.
分析了ANPP对降水变化的敏感性,使用了xeric和mesic草原类型的实验和观测数据.
将实验操作的结果与长期观察数据进行比较,以确定偏差.

主要成果:

在xeric草原,与观测数据相比,试验性降水变化显示出较低的ANPP灵敏度,可能是由于空气湿度的非模拟变化.
在 mesic 草原,实验性降水变化显示出比观测数据更高的 ANPP 灵敏度,这可能是由于自然降雨期间低辐射和温度的同时产生负面影响.
在影响草原ANPP估计的降水操纵实验中证明了干旱度依赖偏差.

结论:

草原上的降雨操纵实验可能无法准确地反映自然生态系统的生产力反应,因为环境变量未被模拟.
在解释实验结果并将其纳入生态系统模型时,需要考虑干旱度依赖的偏差.
未来的研究和建模应该考虑除了降水之外的复杂因素,如湿度,辐射和温度,在草原生产力研究中.

关键词:

在地面上净初级生产率降水变化草地长期观察操纵实验现实检查

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