The Spatial Pattern Of Phytolacca Americana Linn, And Its Control Techniques In Sandy Coastal Shelter Forests

Invasion has done a lot harm to the biodiversity, it is a global environment problem,which is concerned by the word for a long time.The invasion of Phytolacca americana has affected negatively to the coastal shelterforests in China. We set up a lot of plots in Lingshan Bay National Forest Park, figure out thespatial distribution of Phytolacca Americana and its impact factors.To control it effectively,physical control, chemical control compared to biological control and natural growth werecarried out under the Robinia pseudoacacia forest invaded by P. americana seriously. Theresults show as the following:(1) Spatial pattern of Phytolacca americana: The distribution of Phytolacca americanashows that it could grow well in Robinia pseudoacacia forest and mixed forest, which growthe best in Robinia pseudoacacia forest, and grow the worst in Pinus thunbergii forest, so P.Americana Linn. was the most serious in R. Pseudoacacia L. forest, especially surround thenest.(2) Impact factors to Phytolacca americana: There are many factors impact thedistributed of Phytolacca americana, such as the human activities, road, A. Fruticosa andcanopy density.(3) Mowing control to the growing of Phytolacca americana: The growth of P.Americana decreased significantly by mowing control in the same year, while that reached theCK level the next year.(4) Root cutting control to the growing of Phytolacca americana: The2/3root cuttingand whole cutting could remove the individual plants after root cutting right away, however,for that of1/3root cutting, only a part of branches and leaves were controlled above ground inthe same year, and reaches to the CK level in the third year.(5) Chemical control to the growing of Phytolacca americana: The aboveground partswere killed by spraying quizalofop-p-ethyl and paraquat, and then recover to the CK level inthe next year. Total plants could be killed by spraying45g/L of glyphosate, and it can notrecover to the CK level until the third year.(6) Biological control to the growing of Phytolacca americana: The growth of P.Americana maintained at a low level in forest with flourishing Amorpha fruticosa. So biological control with A. Fruticosa is an effective approach to P. Americana’s control.The study revealed the invasion mechanisms of P. Americana Linn., which werereferential for predicting the invasive potential. It provided a guidance for controlling itsecological invasion effectively. The findings were important for restraining its dispersal,reducing or eliminating the harm.