Xingkai Xu received his bachelor's degree from Anhui Agricultural University in 1993 and his doctorate from the Institute of Applied Ecology, Chinese Academy of Sciences, in 1998. He is currently a professor at the University of Chinese Academy of Sciences (UCAS) and an innovative researcher at the State Key Laboratory of Atmospheric Environment and Extreme Meteorology, Institute of Atmospheric Physics, Chinese Academy of Sciences. His research areas include the responses and mechanisms of carbon and nitrogen cycles in terrestrial ecosystems to climate and environmental changes, as well as changes in urban atmospheric carbon dioxide concentrations and their isotope values and influencing mechanisms, especially in the context of national carbon neutrality. He is currently a member of the editorial boards of the journals International Agrophysics, Forests, and Scientific Reports, respectively. Since 2014, he has been teaching the course 'Soil Carbon and Nitrogen Cycles and Greenhouse Gases' at the School of Earth and Planetary Sciences, UCAS; since 2023, he has been teaching the course 'Introduction to Soil Carbon and Nitrogen Cycling' at the International College, UCAS. He consecutively received the Graduate Annual Excellent Course Award from the School of Earth and Planetary Sciences, UCAS from 2021 to 2023. In 2021, He was awarded the Pollyanna Chu Outstanding Teacher Award by the University of Chinese Academy of Sciences.