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Precipitation determines the magnitude and direction of interannual responses of soil respiration to experimental warming

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Abstract

Background and aims

Soil respiration (Rs) is expected to positively feedback to climate warming. The strength of this feedback is uncertain as numerous environmental factors, such as precipitation and soil moisture, can moderate the warming response of Rs.

Methods

We combined seven-year Rs measurements in a warming experiment in the Tibetan alpine grassland with a meta-analysis on grassland warming experiments globally to investigate how precipitation and soil moisture influences the warming response of Rs. We further analyzed the warming responses of heterotrophic (Rh) and autotrophic (Ra) components of Rs.

Results

Warming enhanced growing-season Rs in the wet years but decreased it in the dry years in the field experiment at the Tibetan grassland. Precipitation modulated the warming responses of growing-season Rs via Rh, but not Ra. Consistent with the field experiment, a positive relationship between precipitation and the warming response of growing-season Rs was also observed in the global-scale meta-analysis on grassland warming experiments.

Conclusions

Precipitation influences the warming effects on Rs and could result in variation in warming response of Rs across years and experimental systems. Empirical functions provided by this study could be used to reduce the uncertainty in predicting Rs in a warmer future.

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Acknowledgements

The authors thank Hao Wang, Yan Geng, Zhaorong Mi and Li Lin for their constructive comments. The authors also thank many workers of the Haibei Alpine Grassland Ecosystem Research Station of the Chinese Academy of Sciences for helping maintain our experiment. This study was supported by the National Key Research and Development Program of China (2016YFC0500602) and the National Natural Science Foundation of China (31630009, 31971434, 31600385 and 31670454).

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Correspondence to Jin-Sheng He.

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Responsible Editor: Hans Lambers.

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Wang, Y., Song, C., Liu, H. et al. Precipitation determines the magnitude and direction of interannual responses of soil respiration to experimental warming. Plant Soil 458, 75–91 (2021). https://doi.org/10.1007/s11104-020-04438-y

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  • DOI: https://doi.org/10.1007/s11104-020-04438-y

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