Abstract:Abstract:Climate warming and increased nitrogen (N)deposition, as two important components of global change, can influence the nutrient cycle between plants and soils. Based on a 12-year simulated warming and N addition experiment, we explored the effects of warming and N addition on nutrient resorption for two common species, C3 plant Convolvulus ammannii and C4 plant Kochia prostrata, in 2016 with 52% above the long-term mean precipitation and in 2017 with 16% below the long-term mean. Plant N and phosphorus (P),soil inorganic N and soil available P and soil water content were measured. Our results showed that:(1)In the wet year(2016),warming and N addition significantly increased soil inorganic N by 43.1% and 52.1% ,respectively(P < 0.001), and enhanced available P by 20.3% and 27.55% ,respectively(P < 0.001).Compared to the control, warming, N addition and combined warming and N addition significantly enhanced N and P concentrations in green and senesced leaves of the studied two plants and reduced resoption efficiency of N and P;(2)In the dry year(2017), warming and N addition, had no significant effect on the plant and soil nutrient characteristics;(3)Regression analysis indicated that soil available N, P and water were positively correlated with plant N and P concentrations, but negatively with nutrient resorption. These findings suggest that the responses of nutrient resorption to warming and N addition could be mediated by variations of natural precipitation.