2 Materials and methods
2.1 Study area
Hainan Island (E108°37′-111°03′, N18°10′-20°10) is situated in the
southern part of China, on the northern edge of the tropics (Figure 1).
It has a tropical monsoon climate and a mild climate with long summers
and short winters (Zhang et al., 2022). The annual average temperature
ranges from 22°C to 27°C, and the island has abundant water. Hainan
Island is an important distribution area for China’s monsoon forests and
tropical rainforests (Zhang et al., 2022). The main forest vegetation
types in Hainan Island are tropical rainforest, evergreen broad-leaved
forest, coniferous forest, and plantation forest. Hainan Province has
the largest tropical rainforest in China, with rich flora and fauna
resources, covering 42.5% of the total tropical area of the country (Li
et al., 2022). The critical areas for biodiversity conservation in my
country, ”National Of the 120 species of wild plants in extremely small
populations identified in the Plan for the Rescue and Protection of
WPESP (2011-2015). Hainan has 24 key protection targets. Yunnan and
Hainan are critical areas for the protection of WPESP (Sun et al., 2022)