A Study Of Biological Characteristics Of Invasibility In Exotic Species E.odoratum & E.adenophorum

The study of plant invasibility has a very important meaning in forecasting invasive species. Anatomical, physiological and ecological adaptability of four Eupatorium species (Eupatorium odoratum, E.adenophorum, E.japonese and E.fortunei) were studied in this paper. The result showed that:Morphological and anatomical structures of four Eupatorium species were similar. The stomata bulged out, the epidermic cells had s single layer and were big in size, the intercellular-spaces of mesophyll tissues were remarkable and mechanical tissues degenerated. These facts proved that neutral and humid habitat were their common characteristics. The indexes such as palisade tissue/spongy tissue thickness, leaf thickness, main vascular tissue thickness and Thickness of cuticle in Eupatorium odoratum & E.adenophorum were higher than those in E.japonese and E.fortunei, which showed the two formers have been evolving in transpiration reduction and adapting to drought. With the decrease of soil water content, four Eupatorium species were damaged, but there were significant differences in damage levels. The changes in photosynthetic, physiological and biochemical characters of the four Eupatorium species were...