Eupatorium odoratum Linn, is a perennial grass or subshrub of the genus of Eupatorium(Compositae) , which has become a forestry harmful plant in China. Ecological mechanismof invading by this forestry harmful weed had been studied in this paper. The results as follows:1. In different age, habitats, years and seasons, photosynthetic rates of leaves ranged a wide values, from 2.08 to 18.27 μ mol.m~(-2)s~(-1), which indicates that leaves of Eupatorium odoratum exhibit the higher photosynthetic plasticity. Thou...
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