Weed Occurrence at Several Arboreta of Korea and their Vegetation Analysis

The experiments were carried out to obtain basic information on occurrence pattern and shift of a weed flora, its ecology and ecological niches of weed community at the four arboreta. The obtained results could be summarized as follows. According to TWINSPAN(two-way indicator species analysis) method, weed community was able to be divided into 4 types such as Digitaria sanguinalis-Cyperus amuricus, Digitaria sanguinalis- Artemisia princeps, Digitaria sanguinalis-Setaria viridis, and Digitaria sanguinalis-Arthraxon hispidus communities. The results of the correlation between environmental characteristics and weed community by detrended canonical correspondence analysis (DCCA) ordination method are as follows. Digitaria sanguinalis-Cyperus amuricus community had high organic matter and available phosphorus concen󰠀tration while Digitaria sanguinalis-Arthraxon hispidus community had high magnesium concentration and available phosphorus concentration. On the other hand, Digitaria sanguinalis-Artemisia princeps community had high magnesium concentration whereas Digitaria sanguinalis-Setaria viridis com󰠀munity had low magnesium concentration