[Correlation analysis on the damage of Mikania micrantha to plant communities in Neilingdind Island of Guandong Province, China].

The analysis showed that 58 species of trees, short-trees and shrubs in Neilingding Island of Guangdong Province were damaged by M. micrantha, of which, woody trees accounted for 67%. Short-trees and sunny shrubs were damaged most seriously, followed by the communities with low canopy density consisted of only 2 dominant species, and those with high canopy density consisted of 5 or 6 dominant species. The coverage of M. micrantha mainly related to the vertical structure of plant communities. The taller the community height and the more the synusia, the lesser was the coverage of M. micrantha. The damaging ratio mainly related to species diversity and community density. The higher the species diversity and community density, the lower the damaging ratio was. The damaging degree mainly related to the coverage of other liana. The more the coverage of other liana, the higher was the damaging degree of M. micrantha.

[Progress in studies on an exotic vicious weed Mikania micrantha].

Mikania micrantha is a perennial weed of Astraceae native to south and central America. It has invaded Southeast Asia, Pacific region and South China. Because Mikania micrantha grows very fast and is hard to control, it has become one of the world's worst weed. In this paper, the history and status of the study on Mikania micrantha was reviewed. The research on Mikania micrantha was mainly focused on its biology, ecology, harm and control. Although some progress in the research was obtained, there is no dramatic breakthrough in the control of Mikania micrantha so far. There fore, it needs more work to solve the problems resulted from the invading Mikania micrantha.