Abstract: To reveal soil seed bank size and seedling regeneration capacity of Calamus tetradactylus in Ganzhaling of Hainan Province, we investigated seed distribution and natural regeneration seedlings of C. tetradactylus(≤40 cm) by setting up 30 grid plots (20 m × 20 m) and seven 1 m × 1 m quadrats in each plot along the diagonal. Random Forest method was used to analyze the effects of environmental factors on the abundance of seeds and seedlings. The results showed that seed distribution in soils was not uniform. Seeds in the soil seed bank were mainly concentrated in the litter layer. Class Ⅰ (0-9 cm) of C. tetradactylus seedlings was the main component of the regenerating seedlings, with a contribution of 61.63%. The conversion rate of class Ⅰ to class Ⅱ seedlings was low (39.18%), which was a key factor limiting C. tetradactylus seedling’s natural regeneration. Among all the examined environmental factors, canopy height, canopy density, litter thickness, and stand density were the main ones affecting seed distribution and seedling quantity. In summary, natural regeneration capacity of C. tetradactylus was low under natural conditions, and thus manual intervention and control measures should be adopted to promote the regeneration. To promote the successful natural regeneration ofC. tetradactylus, it is necessary to consider sitespecific environmental factors, such as pruning tree crown and thinning seedlings, which would improve the bedding environment of seeds and the conversion rate of C. tetradactylus seedlings.

Key words: coal resource city, multi-dimensional relationship, ecology-economy-society, coordinated development degree