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

被引：0
|
作者：
Xiao, Biqin [1 ,2 ]
Bai, Xiaoyong [2 ,3 ]
Tan, Qiu [1 ]
Li, Yangbing [1 ]
Zhao, Cuiwei [1 ]
Luo, Guangjie [4 ]
Wu, Luhua [2 ]
Chen, Fei [2 ,5 ]
Li, Chaojun [2 ]
Ran, Chen [2 ]
Xi, Huipeng [2 ]
Zhang, Sirui [1 ,2 ]
Liu, Min [1 ,2 ]
Xiong, Lian [1 ,2 ]
Song, Fengjiao [2 ]
Du, Chaochao [1 ,2 ]
机构：
[1] Guizhou Normal Univ, Sch Geog & Environm Sci, Guiyang 550025, Peoples R China
[2] Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China
[3] CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China
[4] Guizhou Educ Univ, Guizhou Prov Key Lab Geog State Monitoring Watersh, Guiyang 550018, Peoples R China
[5] Guizhou Univ, Coll Resources & Environm Engn, Guiyang 550025, Peoples R China
来源：
LAND | 2023年 / 12卷 / 02期
基金：
中国国家自然科学基金;
关键词：
ecosystem; carbon use efficiency; water use efficiency; contribution; CLIMATE-CHANGE; PRIMARY PRODUCTIVITY; SPATIOTEMPORAL VARIATIONS; TERRESTRIAL ECOSYSTEMS; ELEVATED CO2; GRASSLAND; RESPIRATION; ATTRIBUTION; INCREASE; PLATEAU;
D O I：
10.3390/land12020413
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
With climate change, Nitrogen deposition (ND) and carbon dioxide (CO2) have increased significantly, but the effects of ND and CO2 fertilization on carbon-use efficiency (CUE) and water-use efficiency (WUE) are still unclear. Therefore, the effects of ND and CO2 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) H2O. (2) In the study area, a 53.8% CUE and 61.8% WUE showed an upward trend, and ND enhanced the positive contribution of CO2 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 CO2 explained 45.8% and 50.1% of the increases in CUE and WUE, respectively. (4) The areas dominated by ND and CO2 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.
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页数：18
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