Objective Camellia oleifera is a woody oleiferous plant with high economic and ecological value. Euproctis pseudoconspersa is one of the main pests of C. oleifera, which seriously restricts the yield and quality of C. oleifera. In order to provide scientific basis for early warning and specific prevention and control of the E. pseudoconspersa, the potential distribution of E. pseudoconspersa was simulated and predicted in this study.
Method Based on the distribution data and biological climate data of E. pseudoconspersa in China, MaxEnt model and ArcGIS software were used to predict the suitable areas for E. pseudoconspersa in China under the current climate, and the distribution range and potential suitable areas of E. pseudoconspersa in China in the 2050 and 2070 under SSP1-2.6, SSP2-4.5 and SSP5-8.5 climate change scenarios, and then the dominant environmental variables affecting the distribution of its potential suitable areas were analyzed.
Result (1) The dominant environmental variables affecting the distribution of the suitable habitat of E. pseudoconspersa were the precipitation of driest month, the annual precipitation, the min temperature of coldest month, the mean diurnal range (mean of monthly (max temp - min temp)) The optimum conditions were 28-148 mm the precipitation of driest month, 1 290−2 080 mm the annual precipitation, 1.0−10.1 ℃ the min temperature of coldest month and 7.2−8.5 ℃ the mean diurnal range (mean of monthly (max temp - min temp)). (2) Under the current climate conditions, the total suitable area of E. pseudoconspersa accounts for 20.0% of China’s land area, mainly distributed in the middle and lower reaches of the Yangtze River and South China, with a high suitable area of 642 000 km2, a medium suitable area of 618 000 km2, and a low suitable area of 660 000 km2. (3) In the next two periods and three climate scenarios, the suitable area of Camellia oleifera moth will be enlarged to different degrees, with the newly increased area of 94 000-331 000 km2 and the migration distance of the geographical distribution center between 24.4-125.1 km. The more obvious the climate warming is, the more the potential distribution area increases, and the farther the geographical distribution center moves.
Conclusion E. pseudoconspersa has a wide range of habitats in China, including almost all the provinces in southern China. In the future climate change scenario, the suitable habitat of E. pseudoconspersa will expand northward, westward and other high latitude inland areas. Therefore, it is suggested that relevant departments should make plans and policies in advance to strengthen the observation and control of E. pseudoconspersa, so as to reduce its losses to camellia oleifera industry.