Researchers studied the forest in Hungou, Zhongtiao Mountain by analyzing 40 plots and measuring factors like altitude, soil fertility, and sunlight. They found that tree species distribution is mainly influenced by altitude, soil fertility, and humidity, with soil depth and sunlight playing smaller roles. Environmental factors accounted for 46.14% of the variation in tree species distribution, with altitude and soil fertility being the most important factors. The study classified the forest into 7 plant formations, each representing different types of deciduous broad-leaved forests in North China's warm temperate zone. The findings show how environmental factors shape the distribution of tree species in this forest.