Abstract: In order to understand the distribution pattern and related habitat factors of invasive herb Eupatorium adenophorum along the roadsides in central
 Yunnan, an investigation was made in 12 transects of four land cover types (shrubland, Pinus yunnanensis forest, Eucalyptus smithii plantation, and secondary semi-humid evergreen broadleaved forest) in Chuxiong, Yunnan Province. The investigation showed that the distance from roads had significant effects on the cluster number, cluster area, height, cover, and seed number of E. adenophorum. These five parameters reached their peaks at 5 m from the roadsides, and then declined. Land cover type also had significant effects on the cluster number, cluster area, cover, and seed number of E. adenophorum, e.g., secondary semi-humid evergreen broad-leaved forest could better inhibit the invasion and diffusion of E. adenophorum. The principal component analysis demonstrated that the entire ecological message about the habitat factors could be symbolized by three principal components, i.e., “light and biotic factors” (component 1), “water and heat” (component 2), and “topography” (component 3). The coverage of E. adenophorum was significantly negatively correlated with the coverage of trees and their species richness, and positively correlated with light intensity, suggesting that the increasing coverage of native trees under good protection could better inhibit the invasion and diffusion of E. adenophorum.

Key words: Rice, Suitable sowing date, Knowledge model, Expert system