Analysis on the temporal variation of soil CO2 flux and its response to the environmental factors in Haikou urban lawn—A case study of the south campus of Hainan Normal University

• Wen-xian Xu, 
• Zhi-qing Zhuo, 
• Cong-ju Zhao, 
• Min-jie Zhu, 
• Qi Han, 
• Xiao-wei Wu