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Precipitation determines the magnitude and direction of interannual responses of soil respiration to experimental warming
Plant and Soil ( IF 4.9 ) Pub Date : 2020-01-31 , DOI: 10.1007/s11104-020-04438-y Yonghui Wang , Chao Song , Huiying Liu , Shiping Wang , Hui Zeng , Caiyun Luo , Jin-Sheng He
Plant and Soil ( IF 4.9 ) Pub Date : 2020-01-31 , DOI: 10.1007/s11104-020-04438-y Yonghui Wang , Chao Song , Huiying Liu , Shiping Wang , Hui Zeng , Caiyun Luo , Jin-Sheng He
Background and aims Soil respiration (R s ) 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 R s . Methods We combined seven-year R s 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 R s . We further analyzed the warming responses of heterotrophic (R h ) and autotrophic (R a ) components of R s . Results Warming enhanced growing-season R s 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 R s via R h , but not R a . Consistent with the field experiment, a positive relationship between precipitation and the warming response of growing-season R s was also observed in the global-scale meta-analysis on grassland warming experiments. Conclusions Precipitation influences the warming effects on R s and could result in variation in warming response of R s across years and experimental systems. Empirical functions provided by this study could be used to reduce the uncertainty in predicting R s in a warmer future.
更新日期：2020-01-31
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