Nitrogen Deposition Enhances the Positive Contribution of CO2 Fertilization to China’s Carbon and Water Use Efficiencies

With climate change, Nitrogen deposition (ND) and carbon dioxide (CO2) have increased significantly, but the effects of ND CO2 fertilization on carbon-use efficiency (CUE) water-use (WUE) are still unclear. Therefore, CUE WUE studied by means trend analysis partial derivatives. The results show following: (1) From 2000 to 2020, mean in China was 0.533, 1.235 g C kg−1 H2O. (2) In study area, a 53.8% 61.8% showed an upward trend, enhanced positive contribution 15.9% 19.3%, respectively. (3) explained 48.1% 56% increase WUE, respectively, 45.8% 50.1% increases (4) areas dominated accounted for 43.9% 12.7% total highlighting importance driving mechanism WUE. research helpful further