Spatial variations and mechanisms for the stability of water use efficiency in China

Frontiers in Plant Science

Plant Science

Xiaojuan Xu¹  Jing Liu¹  Naifeng Lin¹  Yingying Zhu¹  Kun Zhang¹  Jie Qiu¹  Yue Yang¹  Changxin Zou¹  Fusheng Jiao² 

[1] Nanjing Institute of Environmental Sciences, MEE, Nanjing, China;School of Geography, Nanjing Normal University, Nanjing, China;

关键词: ecological restoration;    water use efficiency;    climate change;    stability;    driving factors;   

DOI  :  10.3389/fpls.2023.1254395

 received in 2023-07-07, accepted in 2023-09-01,  发布年份 2023

来源: Frontiers

【 摘 要 】

A clearer understanding of the stability of water use efficiency (WUE) and its driving factors contributes to improving water use efficiency and strengthening water resource management. However, the stability of WUE is unclear. Based on the EEMD method, this study analyses the spatial variations and mechanisms for the stability of WUE in China, especially in the National Forest Protection Project (NFPP) areas. It is found that the stable WUE was dominated by non-significant trends and increasing trends in China, accounting for 33.59% and 34.19%, respectively. The non-significant trend of stable WUE was mainly located in the Three-North shelterbelt program area, and the increasing trend of stable WUE was in Huaihe and Taihu, Taihang Mountains, and Pearl River shelterbelt program areas. Precipitation and soil moisture promoted the stable WUE in these project areas. The unstable WUE was dominated by positive reversals or negative reversals of WUE trends. The positive reversals of unstable WUE were mainly located in the Yellow River shelterbelt program areas, which was promoted by temperature and radiation, while the negative reversals of unstable WUE were mainly distributed in the Yangtze River and Liaohe shelterbelt program areas, which were mainly induced by saturation water vapor pressure difference (VPD). Our results highlight that some ecological restoration programs need to be improved to cope with the negative climate impact on the stability of WUE.

【 授权许可】

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Copyright © 2023 Xu, Liu, Jiao, Zhang, Yang, Qiu, Zhu, Lin and Zou