Analysis of the spatial-temporal change and impact factors of the vegetation index in Yulin of China: the effect of forest conservation and grain for green

Jinkai Luan1, Dengfeng Liu1,2, Mu Lin3, Qiang Huang1 and State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, (1)Xi'an University of Technology, School of Water Resources and Hydropower, Xi'an, China, (2)Montana State University, Department of Land Resources and Environmental Sciences, Bozeman, MT, United States, (3)Central University of Finance and Economics, School of Statistics and Mathematics, Beijing, China