Abstract: Sudden oak death (SOD) could result in large area of host vegetation to die in a short time. To examine the spread of SOD spores, the Hysplit forward trajectory model and meteorological data were used to simulate their trajectory in July of 2007, 2011 and 2015, in California, USA. Overlay analysis of the simulation results and SOD outbreak points in the next year showed that the region with a track frequency >10% would have higher point density of the new occurrence of SOD. The simulated results and the next year’s SOD outbreak points were highly fitted. Finally, we used the same method to simulate the trajectory of four hypothetical outbreak points of Zhangzhou Port in Fujian, China for a month (April 2016). The results showed that the SOD would spread from Zhangzhou Port to Zhejiang, Jiangxi and Guangdong. The areas with track frequency >20% mainly distributed in the coastal areas of Fuzhou to Xiamen.

Key words: whole plastic mulching and double ridge-furrow, maize, nitrogen replacement, semi-arid region of Loess Plateau, yield, water and nitrogen use efficiency