Jixuan Yan ^* Xiangdong Yao Qiang Li Miao Song Jie Li Guang Li Guangping Qi Hongqiang Qiao Pengcheng Gao Meihua Zhang

• Gansu Agricultural University, Lanzhou, China

The Yellow River Basin is an important ecological security barrier and ecologically vulnerable region in China. Landscape ecological risk assessment and influencing factors analysis based on land-use/land-cover change (LUCC) and boosted regression tree (BRT) models are of great significance to the coordinated and sustainable development of regional ecological environment and social economy. Based on LUCC and driving factor data from 1980 to 2020. The ecological risk index (ERI) model was constructed to evaluate the spatio-temporal evolution characteristics of ecological risk in the past 40 years. Especially, a new method of influencing factors analysis based on BRT model is proposed. The final index size of the influencing factors were further quantitatively evaluated. The results showed that the spatial distribution pattern of landscape ecological risk in the Yellow River Basin was “highest in the north and lowest in the south, highest in the west and lowest in the east”. During the periods, the overall ecological risk and high risk increased first and then decreased. Elevation (24.8%) was the most important factor affecting landscape ecological risk, followed by precipitation (17.8%), GDP (15.2%) and temperature (14.6%). It showed that the particularity of the geographical location of the Yellow River Basin eventually led to the stronger influence of natural factors on the change of landscape ecological risk under the interference of human activities. This study will provide a new perspective for quantitative assessment of the final contribution rate of landscape ecological risk factors.