Abstract:

Objective: To deeply understand the characteristics of spatial pattern of climbing bamboo in Hainan Island and reveal the ecological process of its population dynamics, and to provide basic data and theoretical support for the protection and management of tropical rainforest and the maintenance and restoration of biodiversity, the paper presents a study of spatial distribution and correlation between Dinochloa orenuda and Bonia levigata in Ganshiling, Hainan Island. Method: Based on a 1 hm² sample plot of National Long-Term Ecosystem Research and Monitoring Station for Bamboo and Rattan Forest in Sanya of Hainan Province, two native climbing bamboos, D. orenuda and B. levigata, were selected to analyze the intraspecific and interspecific spatial distribution and correlation of climbing bamboo populations in the tropical rainforest of Ganshiling by using the paired correlation function g(r) of point pattern analysis. Result: Spatial pattern and spatial scale of climbing bamboo populations are closely related. On small and medium scale, D. orenuda population was significantly aggregated on the scale of 0.5-34.5 m, B. levigata population was aggregated on the scale of 0.5-13.5 m. However, at a larger spatial scale, uniform distribution and random distribution appear alternately. The spatial correlation between D. orenuda and B. levigata populations varies greatly with different scales. On the whole, the spatial relation varies with the distance between them. On small and medium scale as 0-35.5 m, there is a significant negative correlation between them. With the slow increase of scale, the two types of climbing bamboo tend to be uncorrelated.When the distance scale between them is about to break through the upper limit of the edge of 100 m, there is a positive correlation between them. Conclusion: In the populations of D. orenuda and B. levigata, their spatial distribution were basically the same. The difference was that compared with B. levigata, D. orenuda's aggregation scale range is larger. As a plants from the same family, under the condition of resource constraints, on a small scale(0-35.5 m), they are mutually exclusive because of the competition. On a large scale, they can coexist better.

Key words: Hainan Island, tropical rainforest, climbing bamboo, spatial distribution, point pattern