Exploring vegetation distribution spatial patterns facilitates understanding how biodiversity addresses the potential threat of future climate variability, especially for highly diverse and threatened tropical plant communities, but few empirical studies have been performed over various environmental scales. In this study, we used species-based and phylogeny-based methods to analyze the α- and β-diversity pattern variation in Dacrydium pectinatum communities and its key drivers along elevation and geographical gradients across three national nature reserves in Bawangling, Diaoluoshan and Jianfengling. Our study indicates that the species and phylogenetic α-diversity patterns presented consistent decreasing with elevation, with the peak occurring at low elevations. Environmental filtering caused by decreases in limiting factors, such as temperature, precipitation, soil organic matter, soil phosphorus, and light, is the main reason for the decline in diversity at high elevations, whereas low-elevation areas are affected by various factors, such as environmental filtering and similarity limitations. Species and phylogenetic β-diversity changes are closely related to environmental filtering and dispersal limitation, but the latter is key in community assembly at the heterogeneous spatial scale. In conclusion, combining species-based and phylogeny-based methods to explore the biogeographic patterns of tropical plant communities helps provide convincing evidence and confirms that the relative contributions of niche and neutral theory in the assembly process vary along environmental gradients. Though the D. pectinatum community constitute a floristically integrated unit, the genetic relationships between species are relatively far, and co-evolution to promote species coexistence is difficult when faced with habitat pressure. Hence, we believe that species coexistence in tropical plant communities requires mild environmental conditions, and low temperatures, precipitation, soil nutrients and light will aggravate environmental filtering and species competition. We also recommend strengthening the construction and management of nature reserves and the exploration of biodiversity formation mechanisms, which are crucial for biodiversity conservation in endangered tropical plant communities.

Habitat connectivity is indispensable for the survival of species that occupy a small habitat area and have isolated habitat patches from each other. At present, the development of human economy not only squeezes the living space of wild animals, but also strongly interferes and hinders the migration of species. Therefore, we need to enhance the habitat connectivity of species in broken habitats, which would facilitate the proliferation of species, enhance gene exchange between populations and improve the ability of species to respond to environmental changes. Przewalski's gazelle, as one of the world's most endangered ungulate mammals, has historically experienced a significant reduction in population and severe habitat shrinkage. At present, even though the population of this species has recovered to a certain extent, humans Infrastructure severely hindered the gene flow between several patches of this species. Therefore, we used habitat suitability index model combined with Przewalski's gazelle movement characteristics to establish 11 habitat patches, and used the least cost path and circuit theory based on resistance model to jointly simulate the landscape network pattern of this species. In addition, we also analyzed and selected important patches and key migration paths as important references for establishing corridors. Overall, our research aims to provide habitat networks and maintain landscape connectivity to achieve the fundamental goal of protecting and revitalizing Przewalski's gazelle populations.

Exploring the dynamics of natural regeneration facilitates the understanding of the mechanisms of community assembly and biodiversity formation in tropical forests. However, there is still a lack of convincing evidence related to regeneration, especially for threatened tropical plant communities. Dacrydium pectinatum is a constructive and an endangered species in the tropical mountain forests of Hainan Island. A total of 204 regeneration plots of 5 m × 5 m were investigated along environmental axes of temperature and precipitation in the northwest (Bawangling, 90 plots), southwest (Jianfengling, 90 plots) and southeast (Diaoluoshan, 24 plots) of Hainan Island. We examined the variation in community structure, mortality, density and species richness at the three sites and analyzed the key environmental drivers that affect regeneration. The results showed that the mortality of adults, seedlings and saplings was the lowest in Diaoluoshan, followed by Jianfengling and Bawangling. The peaks in the density and species richness of regenerating individuals were limited to mid-elevations. Elevation, soil total nitrogen, soil available phosphorus, canopy density and adult density were significantly correlated with density and species richness. All findings indicate that at a broad landscape scale, variation in precipitation and temperature due to latitude, longitude and elevation is the dominant cause for the formation of the regeneration dynamic patterns along distinct environmental axes and that the intermediate environmental conditions at middle elevations contribute to regeneration. At the community level, habitat preferences related to elevational factors, soil total nitrogen, soil available phosphorus and forest gaps play a key role in regeneration success. Biological mechanisms (negative density-limiting effects) also have an important effect. We recommend various actions to improve the protection of D. pectinatum, such as the prevention of habitat destruction, appropriate thinning of high-density stands, and strengthening of niche research, and increase biodiversity.