Nitrogen Deposition Enhances the Positive Contribution of CO 2 Fertilization to China’s Carbon and Water Use Efficiencies

Biqin Xiao, Xiaoyong Bai (), Qiu Tan, Yangbing Li, Cuiwei Zhao, Guangjie Luo, Luhua Wu, Fei Chen, Chaojun Li, Chen Ran, Huipeng Xi, Sirui Zhang, Min Liu, Lian Xiong, Fengjiao Song and Chaochao Du
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Biqin Xiao: School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang 550025, China
Xiaoyong Bai: State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
Qiu Tan: School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang 550025, China
Yangbing Li: School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang 550025, China
Cuiwei Zhao: School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang 550025, China
Guangjie Luo: Guizhou Provincial Key Laboratory of Geographic State Monitoring of Watershed, Guizhou Education University, Guiyang 550018, China
Luhua Wu: State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
Fei Chen: State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
Chaojun Li: State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
Chen Ran: State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
Huipeng Xi: State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
Sirui Zhang: School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang 550025, China
Min Liu: School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang 550025, China
Lian Xiong: School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang 550025, China
Fengjiao Song: State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
Chaochao Du: School of Geography and Environmental Sciences, Guizhou Normal University, Guiyang 550025, China

Land, 2023, vol. 12, issue 2, 1-18

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

Keywords: ecosystem; carbon use efficiency; water use efficiency; contribution (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2023
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