Prof. Dr. Haijun Liu is a Professor at the College of Water Sciences at Beijing Normal University. He began his scientific career with a Bachelor’s degree in Urban water supply and drainage at the Xi’an University of Technology in 1997. He then received his Master’s degree in Agricultural Engineering at the Chinese Academy of Agricultural Sciences in 2000. Finally, he earned a Ph.D. from the Chinese Academy of Sciences in 2003. He worked as a visiting scholar at the University of Oklahoma, USA, from 2015 to 2016. He has served as the Head of the Department of Hydrology and Water Resource Research at Beijing Normal University since 2018. Additionally, he is a member of the Chinese Academy of Agricultural Sciences and the American Society of Agricultural and Biological Engineering. His research areas include sap flow and evapotranspiration measurements and modeling, SPAC systems in farmland and forest, microclimate changes caused by irrigation methods and cultivated environments, etc.