The study looked at how the plant diversity of Dacrydium pectinatum in Hainan Island, China is affected by environmental factors like temperature, precipitation, and soil conditions. They found that the diversity of these plants is lower than in tropical forests but higher than in subtropical forests at similar latitudes. Plant diversity decreases with increasing latitude and elevation. Factors like elevation, slope, soil nutrients, and stand density play a significant role in determining the distribution of these plants. The study suggests that protecting habitats, monitoring environmental factors, thinning dense stands, and studying genetic diversity can help improve the survival of D. pectinatum communities in the face of environmental changes.